lisp/gnus/gnus-sum.el

   1 ;;; gnus-sum.el --- summary mode commands for Gnus
   2 ;; Copyright (C) 1996, 1997, 1998, 1999, 2000
   3 ;;        Free Software Foundation, Inc.
   4
   5 ;; Author: Lars Magne Ingebrigtsen <larsi@gnus.org>
   6 ;; Keywords: news
   7
   8 ;; This file is part of GNU Emacs.
   9
  10 ;; GNU Emacs is free software; you can redistribute it and/or modify
  11 ;; it under the terms of the GNU General Public License as published by
  12 ;; the Free Software Foundation; either version 2, or (at your option)
  13 ;; any later version.
  14
  15 ;; GNU Emacs is distributed in the hope that it will be useful,
  16 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  17 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18 ;; GNU General Public License for more details.
  19
  20 ;; You should have received a copy of the GNU General Public License
  21 ;; along with GNU Emacs; see the file COPYING.  If not, write to the
  22 ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  23 ;; Boston, MA 02111-1307, USA.
  24
  25 ;;; Commentary:
  26
  27 ;;; Code:
  28
  29 (eval-when-compile (require 'cl))
  30
  31 (require 'gnus)
  32 (require 'gnus-group)
  33 (require 'gnus-spec)
  34 (require 'gnus-range)
  35 (require 'gnus-int)
  36 (require 'gnus-undo)
  37 (require 'gnus-util)
  38 (require 'mm-decode)
  39 ;; Recursive :-(.
  40 ;; (require 'gnus-art)
  41 (require 'nnoo)
  42 (autoload 'gnus-summary-limit-include-cached "gnus-cache" nil t)
  43 (autoload 'gnus-cache-write-active "gnus-cache")
  44 (autoload 'mm-uu-dissect "mm-uu")
  45
  46 (defcustom gnus-kill-summary-on-exit t
  47   "*If non-nil, kill the summary buffer when you exit from it.
  48 If nil, the summary will become a \"*Dead Summary*\" buffer, and
  49 it will be killed sometime later."
  50   :group 'gnus-summary-exit
  51   :type 'boolean)
  52
  53 (defcustom gnus-fetch-old-headers nil
  54   "*Non-nil means that Gnus will try to build threads by grabbing old headers.
  55 If an unread article in the group refers to an older, already read (or
  56 just marked as read) article, the old article will not normally be
  57 displayed in the Summary buffer.  If this variable is non-nil, Gnus
  58 will attempt to grab the headers to the old articles, and thereby
  59 build complete threads.  If it has the value `some', only enough
  60 headers to connect otherwise loose threads will be displayed.  This
  61 variable can also be a number.  In that case, no more than that number
  62 of old headers will be fetched.  If it has the value `invisible', all
  63 old headers will be fetched, but none will be displayed.
  64
  65 The server has to support NOV for any of this to work."
  66   :group 'gnus-thread
  67   :type '(choice (const :tag "off" nil)
  68                  (const some)
  69                  number
  70                  (sexp :menu-tag "other" t)))
  71
  72 (defcustom gnus-refer-thread-limit 200
  73   "*The number of old headers to fetch when doing \\<gnus-summary-mode-map>\\[gnus-summary-refer-thread].
  74 If t, fetch all the available old headers."
  75   :group 'gnus-thread
  76   :type '(choice number
  77                  (sexp :menu-tag "other" t)))
  78
  79 (defcustom gnus-summary-make-false-root 'adopt
  80   "*nil means that Gnus won't gather loose threads.
  81 If the root of a thread has expired or been read in a previous
  82 session, the information necessary to build a complete thread has been
  83 lost.  Instead of having many small sub-threads from this original thread
  84 scattered all over the summary buffer, Gnus can gather them.
  85
  86 If non-nil, Gnus will try to gather all loose sub-threads from an
  87 original thread into one large thread.
  88
  89 If this variable is non-nil, it should be one of `none', `adopt',
  90 `dummy' or `empty'.
  91
  92 If this variable is `none', Gnus will not make a false root, but just
  93 present the sub-threads after another.
  94 If this variable is `dummy', Gnus will create a dummy root that will
  95 have all the sub-threads as children.
  96 If this variable is `adopt', Gnus will make one of the \"children\"
  97 the parent and mark all the step-children as such.
  98 If this variable is `empty', the \"children\" are printed with empty
  99 subject fields.  (Or rather, they will be printed with a string
 100 given by the `gnus-summary-same-subject' variable.)"
 101   :group 'gnus-thread
 102   :type '(choice (const :tag "off" nil)
 103                  (const none)
 104                  (const dummy)
 105                  (const adopt)
 106                  (const empty)))
 107
 108 (defcustom gnus-summary-gather-exclude-subject "^ *$\\|^(none)$"
 109   "*A regexp to match subjects to be excluded from loose thread gathering.
 110 As loose thread gathering is done on subjects only, that means that
 111 there can be many false gatherings performed.  By rooting out certain
 112 common subjects, gathering might become saner."
 113   :group 'gnus-thread
 114   :type 'regexp)
 115
 116 (defcustom gnus-summary-gather-subject-limit nil
 117   "*Maximum length of subject comparisons when gathering loose threads.
 118 Use nil to compare full subjects.  Setting this variable to a low
 119 number will help gather threads that have been corrupted by
 120 newsreaders chopping off subject lines, but it might also mean that
 121 unrelated articles that have subject that happen to begin with the
 122 same few characters will be incorrectly gathered.
 123
 124 If this variable is `fuzzy', Gnus will use a fuzzy algorithm when
 125 comparing subjects."
 126   :group 'gnus-thread
 127   :type '(choice (const :tag "off" nil)
 128                  (const fuzzy)
 129                  (sexp :menu-tag "on" t)))
 130
 131 (defcustom gnus-simplify-subject-functions nil
 132   "List of functions taking a string argument that simplify subjects.
 133 The functions are applied recursively.
 134
 135 Useful functions to put in this list include: `gnus-simplify-subject-re',
 136 `gnus-simplify-subject-fuzzy' and `gnus-simplify-whitespace'."
 137   :group 'gnus-thread
 138   :type '(repeat function))
 139
 140 (defcustom gnus-simplify-ignored-prefixes nil
 141   "*Regexp, matches for which are removed from subject lines when simplifying fuzzily."
 142   :group 'gnus-thread
 143   :type '(choice (const :tag "off" nil)
 144                  regexp))
 145
 146 (defcustom gnus-build-sparse-threads nil
 147   "*If non-nil, fill in the gaps in threads.
 148 If `some', only fill in the gaps that are needed to tie loose threads
 149 together.  If `more', fill in all leaf nodes that Gnus can find.  If
 150 non-nil and non-`some', fill in all gaps that Gnus manages to guess."
 151   :group 'gnus-thread
 152   :type '(choice (const :tag "off" nil)
 153                  (const some)
 154                  (const more)
 155                  (sexp :menu-tag "all" t)))
 156
 157 (defcustom gnus-summary-thread-gathering-function
 158   'gnus-gather-threads-by-subject
 159   "*Function used for gathering loose threads.
 160 There are two pre-defined functions: `gnus-gather-threads-by-subject',
 161 which only takes Subjects into consideration; and
 162 `gnus-gather-threads-by-references', which compared the References
 163 headers of the articles to find matches."
 164   :group 'gnus-thread
 165   :type '(radio (function-item gnus-gather-threads-by-subject)
 166                 (function-item gnus-gather-threads-by-references)
 167                 (function :tag "other")))
 168
 169 (defcustom gnus-summary-same-subject ""
 170   "*String indicating that the current article has the same subject as the previous.
 171 This variable will only be used if the value of
 172 `gnus-summary-make-false-root' is `empty'."
 173   :group 'gnus-summary-format
 174   :type 'string)
 175
 176 (defcustom gnus-summary-goto-unread t
 177   "*If t, many commands will go to the next unread article.
 178 This applies to marking commands as well as other commands that
 179 \"naturally\" select the next article, like, for instance, `SPC' at
 180 the end of an article.
 181
 182 If nil, the marking commands do NOT go to the next unread article
 183 (they go to the next article instead).  If `never', commands that
 184 usually go to the next unread article, will go to the next article,
 185 whether it is read or not."
 186   :group 'gnus-summary-marks
 187   :link '(custom-manual "(gnus)Setting Marks")
 188   :type '(choice (const :tag "off" nil)
 189                  (const never)
 190                  (sexp :menu-tag "on" t)))
 191
 192 (defcustom gnus-summary-default-score 0
 193   "*Default article score level.
 194 All scores generated by the score files will be added to this score.
 195 If this variable is nil, scoring will be disabled."
 196   :group 'gnus-score-default
 197   :type '(choice (const :tag "disable")
 198                  integer))
 199
 200 (defcustom gnus-summary-zcore-fuzz 0
 201   "*Fuzziness factor for the zcore in the summary buffer.
 202 Articles with scores closer than this to `gnus-summary-default-score'
 203 will not be marked."
 204   :group 'gnus-summary-format
 205   :type 'integer)
 206
 207 (defcustom gnus-simplify-subject-fuzzy-regexp nil
 208   "*Strings to be removed when doing fuzzy matches.
 209 This can either be a regular expression or list of regular expressions
 210 that will be removed from subject strings if fuzzy subject
 211 simplification is selected."
 212   :group 'gnus-thread
 213   :type '(repeat regexp))
 214
 215 (defcustom gnus-show-threads t
 216   "*If non-nil, display threads in summary mode."
 217   :group 'gnus-thread
 218   :type 'boolean)
 219
 220 (defcustom gnus-thread-hide-subtree nil
 221   "*If non-nil, hide all threads initially.
 222 If threads are hidden, you have to run the command
 223 `gnus-summary-show-thread' by hand or use `gnus-select-article-hook'
 224 to expose hidden threads."
 225   :group 'gnus-thread
 226   :type 'boolean)
 227
 228 (defcustom gnus-thread-hide-killed t
 229   "*If non-nil, hide killed threads automatically."
 230   :group 'gnus-thread
 231   :type 'boolean)
 232
 233 (defcustom gnus-thread-ignore-subject t
 234   "*If non-nil, which is the default, ignore subjects and do all threading based on the Reference header.
 235 If nil, articles that have different subjects from their parents will
 236 start separate threads."
 237   :group 'gnus-thread
 238   :type 'boolean)
 239
 240 (defcustom gnus-thread-operation-ignore-subject t
 241   "*If non-nil, subjects will be ignored when doing thread commands.
 242 This affects commands like `gnus-summary-kill-thread' and
 243 `gnus-summary-lower-thread'.
 244
 245 If this variable is nil, articles in the same thread with different
 246 subjects will not be included in the operation in question.  If this
 247 variable is `fuzzy', only articles that have subjects that are fuzzily
 248 equal will be included."
 249   :group 'gnus-thread
 250   :type '(choice (const :tag "off" nil)
 251                  (const fuzzy)
 252                  (sexp :tag "on" t)))
 253
 254 (defcustom gnus-thread-indent-level 4
 255   "*Number that says how much each sub-thread should be indented."
 256   :group 'gnus-thread
 257   :type 'integer)
 258
 259 (defcustom gnus-auto-extend-newsgroup t
 260   "*If non-nil, extend newsgroup forward and backward when requested."
 261   :group 'gnus-summary-choose
 262   :type 'boolean)
 263
 264 (defcustom gnus-auto-select-first t
 265   "*If nil, don't select the first unread article when entering a group.
 266 If this variable is `best', select the highest-scored unread article
 267 in the group.  If t, select the first unread article.
 268
 269 This variable can also be a function to place point on a likely
 270 subject line.  Useful values include `gnus-summary-first-unread-subject',
 271 `gnus-summary-first-unread-article' and
 272 `gnus-summary-best-unread-article'.
 273
 274 If you want to prevent automatic selection of the first unread article
 275 in some newsgroups, set the variable to nil in
 276 `gnus-select-group-hook'."
 277   :group 'gnus-group-select
 278   :type '(choice (const :tag "none" nil)
 279                  (const best)
 280                  (sexp :menu-tag "first" t)
 281                  (function-item gnus-summary-first-unread-subject)
 282                  (function-item gnus-summary-first-unread-article)
 283                  (function-item gnus-summary-best-unread-article)))
 284
 285 (defcustom gnus-auto-select-next t
 286   "*If non-nil, offer to go to the next group from the end of the previous.
 287 If the value is t and the next newsgroup is empty, Gnus will exit
 288 summary mode and go back to group mode.  If the value is neither nil
 289 nor t, Gnus will select the following unread newsgroup.  In
 290 particular, if the value is the symbol `quietly', the next unread
 291 newsgroup will be selected without any confirmation, and if it is
 292 `almost-quietly', the next group will be selected without any
 293 confirmation if you are located on the last article in the group.
 294 Finally, if this variable is `slightly-quietly', the `Z n' command
 295 will go to the next group without confirmation."
 296   :group 'gnus-summary-maneuvering
 297   :type '(choice (const :tag "off" nil)
 298                  (const quietly)
 299                  (const almost-quietly)
 300                  (const slightly-quietly)
 301                  (sexp :menu-tag "on" t)))
 302
 303 (defcustom gnus-auto-select-same nil
 304   "*If non-nil, select the next article with the same subject.
 305 If there are no more articles with the same subject, go to
 306 the first unread article."
 307   :group 'gnus-summary-maneuvering
 308   :type 'boolean)
 309
 310 (defcustom gnus-summary-check-current nil
 311   "*If non-nil, consider the current article when moving.
 312 The \"unread\" movement commands will stay on the same line if the
 313 current article is unread."
 314   :group 'gnus-summary-maneuvering
 315   :type 'boolean)
 316
 317 (defcustom gnus-auto-center-summary t
 318   "*If non-nil, always center the current summary buffer.
 319 In particular, if `vertical' do only vertical recentering.  If non-nil
 320 and non-`vertical', do both horizontal and vertical recentering."
 321   :group 'gnus-summary-maneuvering
 322   :type '(choice (const :tag "none" nil)
 323                  (const vertical)
 324                  (integer :tag "height")
 325                  (sexp :menu-tag "both" t)))
 326
 327 (defcustom gnus-show-all-headers nil
 328   "*If non-nil, don't hide any headers."
 329   :group 'gnus-article-hiding
 330   :group 'gnus-article-headers
 331   :type 'boolean)
 332
 333 (defcustom gnus-summary-ignore-duplicates nil
 334   "*If non-nil, ignore articles with identical Message-ID headers."
 335   :group 'gnus-summary
 336   :type 'boolean)
 337
 338 (defcustom gnus-single-article-buffer t
 339   "*If non-nil, display all articles in the same buffer.
 340 If nil, each group will get its own article buffer."
 341   :group 'gnus-article-various
 342   :type 'boolean)
 343
 344 (defcustom gnus-break-pages t
 345   "*If non-nil, do page breaking on articles.
 346 The page delimiter is specified by the `gnus-page-delimiter'
 347 variable."
 348   :group 'gnus-article-various
 349   :type 'boolean)
 350
 351 (defcustom gnus-move-split-methods nil
 352   "*Variable used to suggest where articles are to be moved to.
 353 It uses the same syntax as the `gnus-split-methods' variable."
 354   :group 'gnus-summary-mail
 355   :type '(repeat (choice (list :value (fun) function)
 356                          (cons :value ("" "") regexp (repeat string))
 357                          (sexp :value nil))))
 358
 359 (defcustom gnus-unread-mark ?  ;Whitespace
 360   "*Mark used for unread articles."
 361   :group 'gnus-summary-marks
 362   :type 'character)
 363
 364 (defcustom gnus-ticked-mark ?!
 365   "*Mark used for ticked articles."
 366   :group 'gnus-summary-marks
 367   :type 'character)
 368
 369 (defcustom gnus-dormant-mark ??
 370   "*Mark used for dormant articles."
 371   :group 'gnus-summary-marks
 372   :type 'character)
 373
 374 (defcustom gnus-del-mark ?r
 375   "*Mark used for del'd articles."
 376   :group 'gnus-summary-marks
 377   :type 'character)
 378
 379 (defcustom gnus-read-mark ?R
 380   "*Mark used for read articles."
 381   :group 'gnus-summary-marks
 382   :type 'character)
 383
 384 (defcustom gnus-expirable-mark ?E
 385   "*Mark used for expirable articles."
 386   :group 'gnus-summary-marks
 387   :type 'character)
 388
 389 (defcustom gnus-killed-mark ?K
 390   "*Mark used for killed articles."
 391   :group 'gnus-summary-marks
 392   :type 'character)
 393
 394 (defcustom gnus-souped-mark ?F
 395   "*Mark used for killed articles."
 396   :group 'gnus-summary-marks
 397   :type 'character)
 398
 399 (defcustom gnus-kill-file-mark ?X
 400   "*Mark used for articles killed by kill files."
 401   :group 'gnus-summary-marks
 402   :type 'character)
 403
 404 (defcustom gnus-low-score-mark ?Y
 405   "*Mark used for articles with a low score."
 406   :group 'gnus-summary-marks
 407   :type 'character)
 408
 409 (defcustom gnus-catchup-mark ?C
 410   "*Mark used for articles that are caught up."
 411   :group 'gnus-summary-marks
 412   :type 'character)
 413
 414 (defcustom gnus-replied-mark ?A
 415   "*Mark used for articles that have been replied to."
 416   :group 'gnus-summary-marks
 417   :type 'character)
 418
 419 (defcustom gnus-cached-mark ?*
 420   "*Mark used for articles that are in the cache."
 421   :group 'gnus-summary-marks
 422   :type 'character)
 423
 424 (defcustom gnus-saved-mark ?S
 425   "*Mark used for articles that have been saved to."
 426   :group 'gnus-summary-marks
 427   :type 'character)
 428
 429 (defcustom gnus-ancient-mark ?O
 430   "*Mark used for ancient articles."
 431   :group 'gnus-summary-marks
 432   :type 'character)
 433
 434 (defcustom gnus-sparse-mark ?Q
 435   "*Mark used for sparsely reffed articles."
 436   :group 'gnus-summary-marks
 437   :type 'character)
 438
 439 (defcustom gnus-canceled-mark ?G
 440   "*Mark used for canceled articles."
 441   :group 'gnus-summary-marks
 442   :type 'character)
 443
 444 (defcustom gnus-duplicate-mark ?M
 445   "*Mark used for duplicate articles."
 446   :group 'gnus-summary-marks
 447   :type 'character)
 448
 449 (defcustom gnus-undownloaded-mark ?@
 450   "*Mark used for articles that weren't downloaded."
 451   :group 'gnus-summary-marks
 452   :type 'character)
 453
 454 (defcustom gnus-downloadable-mark ?%
 455   "*Mark used for articles that are to be downloaded."
 456   :group 'gnus-summary-marks
 457   :type 'character)
 458
 459 (defcustom gnus-unsendable-mark ?=
 460   "*Mark used for articles that won't be sent."
 461   :group 'gnus-summary-marks
 462   :type 'character)
 463
 464 (defcustom gnus-score-over-mark ?+
 465   "*Score mark used for articles with high scores."
 466   :group 'gnus-summary-marks
 467   :type 'character)
 468
 469 (defcustom gnus-score-below-mark ?-
 470   "*Score mark used for articles with low scores."
 471   :group 'gnus-summary-marks
 472   :type 'character)
 473
 474 (defcustom gnus-empty-thread-mark ?  ;Whitespace
 475   "*There is no thread under the article."
 476   :group 'gnus-summary-marks
 477   :type 'character)
 478
 479 (defcustom gnus-not-empty-thread-mark ?=
 480   "*There is a thread under the article."
 481   :group 'gnus-summary-marks
 482   :type 'character)
 483
 484 (defcustom gnus-view-pseudo-asynchronously nil
 485   "*If non-nil, Gnus will view pseudo-articles asynchronously."
 486   :group 'gnus-extract-view
 487   :type 'boolean)
 488
 489 (defcustom gnus-auto-expirable-marks
 490   (list gnus-killed-mark gnus-del-mark gnus-catchup-mark
 491         gnus-low-score-mark gnus-ancient-mark gnus-read-mark
 492         gnus-souped-mark gnus-duplicate-mark)
 493   "*The list of marks converted into expiration if a group is auto-expirable."
 494   :group 'gnus-summary
 495   :type '(repeat character))
 496
 497 (defcustom gnus-inhibit-user-auto-expire t
 498   "*If non-nil, user marking commands will not mark an article as expirable, even if the group has auto-expire turned on."
 499   :group 'gnus-summary
 500   :type 'boolean)
 501
 502 (defcustom gnus-view-pseudos nil
 503   "*If `automatic', pseudo-articles will be viewed automatically.
 504 If `not-confirm', pseudos will be viewed automatically, and the user
 505 will not be asked to confirm the command."
 506   :group 'gnus-extract-view
 507   :type '(choice (const :tag "off" nil)
 508                  (const automatic)
 509                  (const not-confirm)))
 510
 511 (defcustom gnus-view-pseudos-separately t
 512   "*If non-nil, one pseudo-article will be created for each file to be viewed.
 513 If nil, all files that use the same viewing command will be given as a
 514 list of parameters to that command."
 515   :group 'gnus-extract-view
 516   :type 'boolean)
 517
 518 (defcustom gnus-insert-pseudo-articles t
 519   "*If non-nil, insert pseudo-articles when decoding articles."
 520   :group 'gnus-extract-view
 521   :type 'boolean)
 522
 523 (defcustom gnus-summary-dummy-line-format
 524   "  %(:                          :%) %S\n"
 525   "*The format specification for the dummy roots in the summary buffer.
 526 It works along the same lines as a normal formatting string,
 527 with some simple extensions.
 528
 529 %S  The subject"
 530   :group 'gnus-threading
 531   :type 'string)
 532
 533 (defcustom gnus-summary-mode-line-format "Gnus: %g [%A] %Z"
 534   "*The format specification for the summary mode line.
 535 It works along the same lines as a normal formatting string,
 536 with some simple extensions:
 537
 538 %G  Group name
 539 %p  Unprefixed group name
 540 %A  Current article number
 541 %z  Current article score
 542 %V  Gnus version
 543 %U  Number of unread articles in the group
 544 %e  Number of unselected articles in the group
 545 %Z  A string with unread/unselected article counts
 546 %g  Shortish group name
 547 %S  Subject of the current article
 548 %u  User-defined spec
 549 %s  Current score file name
 550 %d  Number of dormant articles
 551 %r  Number of articles that have been marked as read in this session
 552 %E  Number of articles expunged by the score files"
 553   :group 'gnus-summary-format
 554   :type 'string)
 555
 556 (defcustom gnus-list-identifiers nil
 557   "Regexp that matches list identifiers to be removed from subject.
 558 This can also be a list of regexps."
 559   :group 'gnus-summary-format
 560   :group 'gnus-article-hiding
 561   :type '(choice (const :tag "none" nil)
 562                  (regexp :value ".*")
 563                  (repeat :value (".*") regexp)))
 564
 565 (defcustom gnus-summary-mark-below 0
 566   "*Mark all articles with a score below this variable as read.
 567 This variable is local to each summary buffer and usually set by the
 568 score file."
 569   :group 'gnus-score-default
 570   :type 'integer)
 571
 572 (defcustom gnus-article-sort-functions '(gnus-article-sort-by-number)
 573   "*List of functions used for sorting articles in the summary buffer.
 574 This variable is only used when not using a threaded display."
 575   :group 'gnus-summary-sort
 576   :type '(repeat (choice (function-item gnus-article-sort-by-number)
 577                          (function-item gnus-article-sort-by-author)
 578                          (function-item gnus-article-sort-by-subject)
 579                          (function-item gnus-article-sort-by-date)
 580                          (function-item gnus-article-sort-by-score)
 581                          (function :tag "other"))))
 582
 583 (defcustom gnus-thread-sort-functions '(gnus-thread-sort-by-number)
 584   "*List of functions used for sorting threads in the summary buffer.
 585 By default, threads are sorted by article number.
 586
 587 Each function takes two threads and return non-nil if the first thread
 588 should be sorted before the other.  If you use more than one function,
 589 the primary sort function should be the last.  You should probably
 590 always include `gnus-thread-sort-by-number' in the list of sorting
 591 functions -- preferably first.
 592
 593 Ready-made functions include `gnus-thread-sort-by-number',
 594 `gnus-thread-sort-by-author', `gnus-thread-sort-by-subject',
 595 `gnus-thread-sort-by-date', `gnus-thread-sort-by-score' and
 596 `gnus-thread-sort-by-total-score' (see `gnus-thread-score-function')."
 597   :group 'gnus-summary-sort
 598   :type '(repeat (choice (function-item gnus-thread-sort-by-number)
 599                          (function-item gnus-thread-sort-by-author)
 600                          (function-item gnus-thread-sort-by-subject)
 601                          (function-item gnus-thread-sort-by-date)
 602                          (function-item gnus-thread-sort-by-score)
 603                          (function-item gnus-thread-sort-by-total-score)
 604                          (function :tag "other"))))
 605
 606 (defcustom gnus-thread-score-function '+
 607   "*Function used for calculating the total score of a thread.
 608
 609 The function is called with the scores of the article and each
 610 subthread and should then return the score of the thread.
 611
 612 Some functions you can use are `+', `max', or `min'."
 613   :group 'gnus-summary-sort
 614   :type 'function)
 615
 616 (defcustom gnus-summary-expunge-below nil
 617   "All articles that have a score less than this variable will be expunged.
 618 This variable is local to the summary buffers."
 619   :group 'gnus-score-default
 620   :type '(choice (const :tag "off" nil)
 621                  integer))
 622
 623 (defcustom gnus-thread-expunge-below nil
 624   "All threads that have a total score less than this variable will be expunged.
 625 See `gnus-thread-score-function' for en explanation of what a
 626 \"thread score\" is.
 627
 628 This variable is local to the summary buffers."
 629   :group 'gnus-threading
 630   :group 'gnus-score-default
 631   :type '(choice (const :tag "off" nil)
 632                  integer))
 633
 634 (defcustom gnus-summary-mode-hook nil
 635   "*A hook for Gnus summary mode.
 636 This hook is run before any variables are set in the summary buffer."
 637   :options '(turn-on-gnus-mailing-list-mode)
 638   :group 'gnus-summary-various
 639   :type 'hook)
 640
 641 (defcustom gnus-summary-menu-hook nil
 642   "*Hook run after the creation of the summary mode menu."
 643   :group 'gnus-summary-visual
 644   :type 'hook)
 645
 646 (defcustom gnus-summary-exit-hook nil
 647   "*A hook called on exit from the summary buffer.
 648 It will be called with point in the group buffer."
 649   :group 'gnus-summary-exit
 650   :type 'hook)
 651
 652 (defcustom gnus-summary-prepare-hook nil
 653   "*A hook called after the summary buffer has been generated.
 654 If you want to modify the summary buffer, you can use this hook."
 655   :group 'gnus-summary-various
 656   :type 'hook)
 657
 658 (defcustom gnus-summary-prepared-hook nil
 659   "*A hook called as the last thing after the summary buffer has been generated."
 660   :group 'gnus-summary-various
 661   :type 'hook)
 662
 663 (defcustom gnus-summary-generate-hook nil
 664   "*A hook run just before generating the summary buffer.
 665 This hook is commonly used to customize threading variables and the
 666 like."
 667   :group 'gnus-summary-various
 668   :type 'hook)
 669
 670 (defcustom gnus-select-group-hook nil
 671   "*A hook called when a newsgroup is selected.
 672
 673 If you'd like to simplify subjects like the
 674 `gnus-summary-next-same-subject' command does, you can use the
 675 following hook:
 676
 677  (setq gnus-select-group-hook
 678       (list
 679         (lambda ()
 680           (mapcar (lambda (header)
 681                      (mail-header-set-subject
 682                       header
 683                       (gnus-simplify-subject
 684                        (mail-header-subject header) 're-only)))
 685                   gnus-newsgroup-headers))))"
 686   :group 'gnus-group-select
 687   :type 'hook)
 688
 689 (defcustom gnus-select-article-hook nil
 690   "*A hook called when an article is selected."
 691   :group 'gnus-summary-choose
 692   :type 'hook)
 693
 694 (defcustom gnus-visual-mark-article-hook
 695   (list 'gnus-highlight-selected-summary)
 696   "*Hook run after selecting an article in the summary buffer.
 697 It is meant to be used for highlighting the article in some way.  It
 698 is not run if `gnus-visual' is nil."
 699   :group 'gnus-summary-visual
 700   :type 'hook)
 701
 702 (defcustom gnus-parse-headers-hook nil
 703   "*A hook called before parsing the headers."
 704   :group 'gnus-various
 705   :type 'hook)
 706
 707 (defcustom gnus-exit-group-hook nil
 708   "*A hook called when exiting summary mode.
 709 This hook is not called from the non-updating exit commands like `Q'."
 710   :group 'gnus-various
 711   :type 'hook)
 712
 713 (defcustom gnus-summary-update-hook
 714   (list 'gnus-summary-highlight-line)
 715   "*A hook called when a summary line is changed.
 716 The hook will not be called if `gnus-visual' is nil.
 717
 718 The default function `gnus-summary-highlight-line' will
 719 highlight the line according to the `gnus-summary-highlight'
 720 variable."
 721   :group 'gnus-summary-visual
 722   :type 'hook)
 723
 724 (defcustom gnus-mark-article-hook '(gnus-summary-mark-read-and-unread-as-read)
 725   "*A hook called when an article is selected for the first time.
 726 The hook is intended to mark an article as read (or unread)
 727 automatically when it is selected."
 728   :group 'gnus-summary-choose
 729   :type 'hook)
 730
 731 (defcustom gnus-group-no-more-groups-hook nil
 732   "*A hook run when returning to group mode having no more (unread) groups."
 733   :group 'gnus-group-select
 734   :type 'hook)
 735
 736 (defcustom gnus-ps-print-hook nil
 737   "*A hook run before ps-printing something from Gnus."
 738   :group 'gnus-summary
 739   :type 'hook)
 740
 741 (defcustom gnus-summary-selected-face 'gnus-summary-selected-face
 742   "Face used for highlighting the current article in the summary buffer."
 743   :group 'gnus-summary-visual
 744   :type 'face)
 745
 746 (defcustom gnus-summary-highlight
 747   '(((= mark gnus-canceled-mark)
 748      . gnus-summary-cancelled-face)
 749     ((and (> score default)
 750           (or (= mark gnus-dormant-mark)
 751               (= mark gnus-ticked-mark)))
 752      . gnus-summary-high-ticked-face)
 753     ((and (< score default)
 754           (or (= mark gnus-dormant-mark)
 755               (= mark gnus-ticked-mark)))
 756      . gnus-summary-low-ticked-face)
 757     ((or (= mark gnus-dormant-mark)
 758          (= mark gnus-ticked-mark))
 759      . gnus-summary-normal-ticked-face)
 760     ((and (> score default) (= mark gnus-ancient-mark))
 761      . gnus-summary-high-ancient-face)
 762     ((and (< score default) (= mark gnus-ancient-mark))
 763      . gnus-summary-low-ancient-face)
 764     ((= mark gnus-ancient-mark)
 765      . gnus-summary-normal-ancient-face)
 766     ((and (> score default) (= mark gnus-unread-mark))
 767      . gnus-summary-high-unread-face)
 768     ((and (< score default) (= mark gnus-unread-mark))
 769      . gnus-summary-low-unread-face)
 770     ((= mark gnus-unread-mark)
 771      . gnus-summary-normal-unread-face)
 772     ((and (> score default) (memq mark (list gnus-downloadable-mark
 773                                              gnus-undownloaded-mark)))
 774      . gnus-summary-high-unread-face)
 775     ((and (< score default) (memq mark (list gnus-downloadable-mark
 776                                              gnus-undownloaded-mark)))
 777      . gnus-summary-low-unread-face)
 778     ((memq mark (list gnus-downloadable-mark gnus-undownloaded-mark))
 779      . gnus-summary-normal-unread-face)
 780     ((> score default)
 781      . gnus-summary-high-read-face)
 782     ((< score default)
 783      . gnus-summary-low-read-face)
 784     (t
 785      . gnus-summary-normal-read-face))
 786   "*Controls the highlighting of summary buffer lines.
 787
 788 A list of (FORM . FACE) pairs.  When deciding how a a particular
 789 summary line should be displayed, each form is evaluated.  The content
 790 of the face field after the first true form is used.  You can change
 791 how those summary lines are displayed, by editing the face field.
 792
 793 You can use the following variables in the FORM field.
 794
 795 score:   The articles score
 796 default: The default article score.
 797 below:   The score below which articles are automatically marked as read.
 798 mark:    The articles mark."
 799   :group 'gnus-summary-visual
 800   :type '(repeat (cons (sexp :tag "Form" nil)
 801                        face)))
 802
 803 (defcustom gnus-alter-header-function nil
 804   "Function called to allow alteration of article header structures.
 805 The function is called with one parameter, the article header vector,
 806 which it may alter in any way.")
 807
 808 (defvar gnus-decode-encoded-word-function 'mail-decode-encoded-word-string
 809   "Variable that says which function should be used to decode a string with encoded words.")
 810
 811 (defcustom gnus-extra-headers nil
 812   "*Extra headers to parse."
 813   :group 'gnus-summary
 814   :type '(repeat symbol))
 815
 816 (defcustom gnus-ignored-from-addresses
 817   (and user-mail-address (regexp-quote user-mail-address))
 818   "*Regexp of From headers that may be suppressed in favor of To headers."
 819   :group 'gnus-summary
 820   :type 'regexp)
 821
 822 (defcustom gnus-group-charset-alist
 823   '(("^hk\\>\\|^tw\\>\\|\\<big5\\>" cn-big5)
 824     ("^cn\\>\\|\\<chinese\\>" cn-gb-2312)
 825     ("^fj\\>\\|^japan\\>" iso-2022-jp-2)
 826     ("^tnn\\>\\|^pin\\>\\|^sci.lang.japan" iso-2022-7bit)
 827     ("^relcom\\>" koi8-r)
 828     ("^fido7\\>" koi8-r)
 829     ("^\\(cz\\|hun\\|pl\\|sk\\|hr\\)\\>" iso-8859-2)
 830     ("^israel\\>" iso-8859-1)
 831     ("^han\\>" euc-kr)
 832     ("^alt.chinese.text.big5\\>" chinese-big5)
 833     ("^soc.culture.vietnamese\\>" vietnamese-viqr)
 834     ("^\\(comp\\|rec\\|alt\\|sci\\|soc\\|news\\|gnu\\|bofh\\)\\>" iso-8859-1)
 835     (".*" iso-8859-1))
 836   "Alist of regexps (to match group names) and default charsets to be used when reading."
 837   :type '(repeat (list (regexp :tag "Group")
 838                        (symbol :tag "Charset")))
 839   :group 'gnus-charset)
 840
 841 (defcustom gnus-newsgroup-ignored-charsets '(unknown-8bit x-unknown)
 842   "List of charsets that should be ignored.
 843 When these charsets are used in the \"charset\" parameter, the
 844 default charset will be used instead."
 845   :type '(repeat symbol)
 846   :group 'gnus-charset)
 847
 848 (defcustom gnus-group-ignored-charsets-alist
 849   '(("alt\\.chinese\\.text" iso-8859-1))
 850   "Alist of regexps (to match group names) and charsets that should be ignored.
 851 When these charsets are used in the \"charset\" parameter, the
 852 default charset will be used instead."
 853   :type '(repeat (cons (regexp :tag "Group")
 854                        (repeat symbol)))
 855   :group 'gnus-charset)
 856
 857 (defcustom gnus-group-highlight-words-alist nil
 858   "Alist of group regexps and highlight regexps.
 859 This variable uses the same syntax as `gnus-emphasis-alist'."
 860   :type '(repeat (cons (regexp :tag "Group")
 861                        (repeat (list (regexp :tag "Highlight regexp")
 862                                      (number :tag "Group for entire word" 0)
 863                                      (number :tag "Group for displayed part" 0)
 864                                      (symbol :tag "Face"
 865                                              gnus-emphasis-highlight-words)))))
 866   :group 'gnus-summary-visual)
 867
 868 (defcustom gnus-summary-show-article-charset-alist
 869   nil
 870   "Alist of number and charset.
 871 The article will be shown with the charset corresponding to the
 872 numbered argument.
 873 For example: ((1 . cn-gb-2312) (2 . big5))."
 874   :type '(repeat (cons (number :tag "Argument" 1)
 875                        (symbol :tag "Charset")))
 876   :group 'gnus-charset)
 877
 878 (defcustom gnus-preserve-marks t
 879   "Whether marks are preserved when moving, copying and respooling messages."
 880   :type 'boolean
 881   :group 'gnus-summary-marks)
 882
 883 (defcustom gnus-alter-articles-to-read-function nil
 884   "Function to be called to alter the list of articles to be selected."
 885   :type 'function
 886   :group 'gnus-summary)
 887
 888 (defcustom gnus-orphan-score nil
 889   "*All orphans get this score added.  Set in the score file."
 890   :group 'gnus-score-default
 891   :type '(choice (const nil)
 892                  integer))
 893
 894 (defcustom gnus-summary-save-parts-default-mime "image/.*"
 895   "*A regexp to match MIME parts when saving multiple parts of a message
 896 with gnus-summary-save-parts (X m). This regexp will be used by default
 897 when prompting the user for which type of files to save."
 898   :group 'gnus-summary
 899   :type 'regexp)
 900
 901
 902 ;;; Internal variables
 903
 904 (defvar gnus-article-mime-handles nil)
 905 (defvar gnus-article-decoded-p nil)
 906 (defvar gnus-scores-exclude-files nil)
 907 (defvar gnus-page-broken nil)
 908 (defvar gnus-inhibit-mime-unbuttonizing nil)
 909
 910 (defvar gnus-original-article nil)
 911 (defvar gnus-article-internal-prepare-hook nil)
 912 (defvar gnus-newsgroup-process-stack nil)
 913
 914 (defvar gnus-thread-indent-array nil)
 915 (defvar gnus-thread-indent-array-level gnus-thread-indent-level)
 916 (defvar gnus-sort-gathered-threads-function 'gnus-thread-sort-by-number
 917   "Function called to sort the articles within a thread after it has been gathered together.")
 918
 919 (defvar gnus-summary-save-parts-type-history nil)
 920 (defvar gnus-summary-save-parts-last-directory nil)
 921
 922 ;; Avoid highlighting in kill files.
 923 (defvar gnus-summary-inhibit-highlight nil)
 924 (defvar gnus-newsgroup-selected-overlay nil)
 925 (defvar gnus-inhibit-limiting nil)
 926 (defvar gnus-newsgroup-adaptive-score-file nil)
 927 (defvar gnus-current-score-file nil)
 928 (defvar gnus-current-move-group nil)
 929 (defvar gnus-current-copy-group nil)
 930 (defvar gnus-current-crosspost-group nil)
 931
 932 (defvar gnus-newsgroup-dependencies nil)
 933 (defvar gnus-newsgroup-adaptive nil)
 934 (defvar gnus-summary-display-article-function nil)
 935 (defvar gnus-summary-highlight-line-function nil
 936   "Function called after highlighting a summary line.")
 937
 938 (defvar gnus-summary-line-format-alist
 939   `((?N ,(macroexpand '(mail-header-number gnus-tmp-header)) ?d)
 940     (?S ,(macroexpand '(mail-header-subject gnus-tmp-header)) ?s)
 941     (?s gnus-tmp-subject-or-nil ?s)
 942     (?n gnus-tmp-name ?s)
 943     (?A (car (cdr (funcall gnus-extract-address-components gnus-tmp-from)))
 944         ?s)
 945     (?a (or (car (funcall gnus-extract-address-components gnus-tmp-from))
 946             gnus-tmp-from) ?s)
 947     (?F gnus-tmp-from ?s)
 948     (?x ,(macroexpand '(mail-header-xref gnus-tmp-header)) ?s)
 949     (?D ,(macroexpand '(mail-header-date gnus-tmp-header)) ?s)
 950     (?d (gnus-dd-mmm (mail-header-date gnus-tmp-header)) ?s)
 951     (?o (gnus-date-iso8601 (mail-header-date gnus-tmp-header)) ?s)
 952     (?M ,(macroexpand '(mail-header-id gnus-tmp-header)) ?s)
 953     (?r ,(macroexpand '(mail-header-references gnus-tmp-header)) ?s)
 954     (?c (or (mail-header-chars gnus-tmp-header) 0) ?d)
 955     (?L gnus-tmp-lines ?d)
 956     (?I gnus-tmp-indentation ?s)
 957     (?T (if (= gnus-tmp-level 0) "" (make-string (frame-width) ? )) ?s)
 958     (?R gnus-tmp-replied ?c)
 959     (?\[ gnus-tmp-opening-bracket ?c)
 960     (?\] gnus-tmp-closing-bracket ?c)
 961     (?\> (make-string gnus-tmp-level ? ) ?s)
 962     (?\< (make-string (max 0 (- 20 gnus-tmp-level)) ? ) ?s)
 963     (?i gnus-tmp-score ?d)
 964     (?z gnus-tmp-score-char ?c)
 965     (?l (bbb-grouplens-score gnus-tmp-header) ?s)
 966     (?V (gnus-thread-total-score (and (boundp 'thread) (car thread))) ?d)
 967     (?U gnus-tmp-unread ?c)
 968     (?f (gnus-summary-from-or-to-or-newsgroups gnus-tmp-header) ?s)
 969     (?t (gnus-summary-number-of-articles-in-thread
 970          (and (boundp 'thread) (car thread)) gnus-tmp-level)
 971         ?d)
 972     (?e (gnus-summary-number-of-articles-in-thread
 973          (and (boundp 'thread) (car thread)) gnus-tmp-level t)
 974         ?c)
 975     (?u gnus-tmp-user-defined ?s)
 976     (?P (gnus-pick-line-number) ?d))
 977   "An alist of format specifications that can appear in summary lines.
 978 These are paired with what variables they correspond with, along with
 979 the type of the variable (string, integer, character, etc).")
 980
 981 (defvar gnus-summary-dummy-line-format-alist
 982   `((?S gnus-tmp-subject ?s)
 983     (?N gnus-tmp-number ?d)
 984     (?u gnus-tmp-user-defined ?s)))
 985
 986 (defvar gnus-summary-mode-line-format-alist
 987   `((?G gnus-tmp-group-name ?s)
 988     (?g (gnus-short-group-name gnus-tmp-group-name) ?s)
 989     (?p (gnus-group-real-name gnus-tmp-group-name) ?s)
 990     (?A gnus-tmp-article-number ?d)
 991     (?Z gnus-tmp-unread-and-unselected ?s)
 992     (?V gnus-version ?s)
 993     (?U gnus-tmp-unread-and-unticked ?d)
 994     (?S gnus-tmp-subject ?s)
 995     (?e gnus-tmp-unselected ?d)
 996     (?u gnus-tmp-user-defined ?s)
 997     (?d (length gnus-newsgroup-dormant) ?d)
 998     (?t (length gnus-newsgroup-marked) ?d)
 999     (?r (length gnus-newsgroup-reads) ?d)
1000     (?z (gnus-summary-article-score gnus-tmp-article-number) ?d)
1001     (?E gnus-newsgroup-expunged-tally ?d)
1002     (?s (gnus-current-score-file-nondirectory) ?s)))
1003
1004 (defvar gnus-last-search-regexp nil
1005   "Default regexp for article search command.")
1006
1007 (defvar gnus-last-shell-command nil
1008   "Default shell command on article.")
1009
1010 (defvar gnus-newsgroup-begin nil)
1011 (defvar gnus-newsgroup-end nil)
1012 (defvar gnus-newsgroup-last-rmail nil)
1013 (defvar gnus-newsgroup-last-mail nil)
1014 (defvar gnus-newsgroup-last-folder nil)
1015 (defvar gnus-newsgroup-last-file nil)
1016 (defvar gnus-newsgroup-auto-expire nil)
1017 (defvar gnus-newsgroup-active nil)
1018
1019 (defvar gnus-newsgroup-data nil)
1020 (defvar gnus-newsgroup-data-reverse nil)
1021 (defvar gnus-newsgroup-limit nil)
1022 (defvar gnus-newsgroup-limits nil)
1023
1024 (defvar gnus-newsgroup-unreads nil
1025   "List of unread articles in the current newsgroup.")
1026
1027 (defvar gnus-newsgroup-unselected nil
1028   "List of unselected unread articles in the current newsgroup.")
1029
1030 (defvar gnus-newsgroup-reads nil
1031   "Alist of read articles and article marks in the current newsgroup.")
1032
1033 (defvar gnus-newsgroup-expunged-tally nil)
1034
1035 (defvar gnus-newsgroup-marked nil
1036   "List of ticked articles in the current newsgroup (a subset of unread art).")
1037
1038 (defvar gnus-newsgroup-killed nil
1039   "List of ranges of articles that have been through the scoring process.")
1040
1041 (defvar gnus-newsgroup-cached nil
1042   "List of articles that come from the article cache.")
1043
1044 (defvar gnus-newsgroup-saved nil
1045   "List of articles that have been saved.")
1046
1047 (defvar gnus-newsgroup-kill-headers nil)
1048
1049 (defvar gnus-newsgroup-replied nil
1050   "List of articles that have been replied to in the current newsgroup.")
1051
1052 (defvar gnus-newsgroup-expirable nil
1053   "List of articles in the current newsgroup that can be expired.")
1054
1055 (defvar gnus-newsgroup-processable nil
1056   "List of articles in the current newsgroup that can be processed.")
1057
1058 (defvar gnus-newsgroup-downloadable nil
1059   "List of articles in the current newsgroup that can be processed.")
1060
1061 (defvar gnus-newsgroup-undownloaded nil
1062   "List of articles in the current newsgroup that haven't been downloaded..")
1063
1064 (defvar gnus-newsgroup-unsendable nil
1065   "List of articles in the current newsgroup that won't be sent.")
1066
1067 (defvar gnus-newsgroup-bookmarks nil
1068   "List of articles in the current newsgroup that have bookmarks.")
1069
1070 (defvar gnus-newsgroup-dormant nil
1071   "List of dormant articles in the current newsgroup.")
1072
1073 (defvar gnus-newsgroup-scored nil
1074   "List of scored articles in the current newsgroup.")
1075
1076 (defvar gnus-newsgroup-headers nil
1077   "List of article headers in the current newsgroup.")
1078
1079 (defvar gnus-newsgroup-threads nil)
1080
1081 (defvar gnus-newsgroup-prepared nil
1082   "Whether the current group has been prepared properly.")
1083
1084 (defvar gnus-newsgroup-ancient nil
1085   "List of `gnus-fetch-old-headers' articles in the current newsgroup.")
1086
1087 (defvar gnus-newsgroup-sparse nil)
1088
1089 (defvar gnus-current-article nil)
1090 (defvar gnus-article-current nil)
1091 (defvar gnus-current-headers nil)
1092 (defvar gnus-have-all-headers nil)
1093 (defvar gnus-last-article nil)
1094 (defvar gnus-newsgroup-history nil)
1095 (defvar gnus-newsgroup-charset nil)
1096 (defvar gnus-newsgroup-ephemeral-charset nil)
1097 (defvar gnus-newsgroup-ephemeral-ignored-charsets nil)
1098
1099 (defconst gnus-summary-local-variables
1100   '(gnus-newsgroup-name
1101     gnus-newsgroup-begin gnus-newsgroup-end
1102     gnus-newsgroup-last-rmail gnus-newsgroup-last-mail
1103     gnus-newsgroup-last-folder gnus-newsgroup-last-file
1104     gnus-newsgroup-auto-expire gnus-newsgroup-unreads
1105     gnus-newsgroup-unselected gnus-newsgroup-marked
1106     gnus-newsgroup-reads gnus-newsgroup-saved
1107     gnus-newsgroup-replied gnus-newsgroup-expirable
1108     gnus-newsgroup-processable gnus-newsgroup-killed
1109     gnus-newsgroup-downloadable gnus-newsgroup-undownloaded
1110     gnus-newsgroup-unsendable
1111     gnus-newsgroup-bookmarks gnus-newsgroup-dormant
1112     gnus-newsgroup-headers gnus-newsgroup-threads
1113     gnus-newsgroup-prepared gnus-summary-highlight-line-function
1114     gnus-current-article gnus-current-headers gnus-have-all-headers
1115     gnus-last-article gnus-article-internal-prepare-hook
1116     gnus-newsgroup-dependencies gnus-newsgroup-selected-overlay
1117     gnus-newsgroup-scored gnus-newsgroup-kill-headers
1118     gnus-thread-expunge-below
1119     gnus-score-alist gnus-current-score-file
1120     (gnus-summary-expunge-below . global)
1121     (gnus-summary-mark-below . global)
1122     (gnus-orphan-score . global)
1123     gnus-newsgroup-active gnus-scores-exclude-files
1124     gnus-newsgroup-history gnus-newsgroup-ancient
1125     gnus-newsgroup-sparse gnus-newsgroup-process-stack
1126     (gnus-newsgroup-adaptive . gnus-use-adaptive-scoring)
1127     gnus-newsgroup-adaptive-score-file (gnus-reffed-article-number . -1)
1128     (gnus-newsgroup-expunged-tally . 0)
1129     gnus-cache-removable-articles gnus-newsgroup-cached
1130     gnus-newsgroup-data gnus-newsgroup-data-reverse
1131     gnus-newsgroup-limit gnus-newsgroup-limits
1132     gnus-newsgroup-charset)
1133   "Variables that are buffer-local to the summary buffers.")
1134
1135 ;; Byte-compiler warning.
1136 (eval-when-compile (defvar gnus-article-mode-map))
1137
1138 ;; MIME stuff.
1139
1140 (defvar gnus-decode-encoded-word-methods
1141   '(mail-decode-encoded-word-string)
1142   "List of methods used to decode encoded words.
1143
1144 This variable is a list of FUNCTION or (REGEXP . FUNCTION).  If item is
1145 FUNCTION, FUNCTION will be apply to all newsgroups.  If item is a
1146 (REGEXP . FUNCTION), FUNCTION will be only apply to thes newsgroups
1147 whose names match REGEXP.
1148
1149 For example:
1150 ((\"chinese\" . gnus-decode-encoded-word-string-by-guess)
1151  mail-decode-encoded-word-string
1152  (\"chinese\" . rfc1843-decode-string))")
1153
1154 (defvar gnus-decode-encoded-word-methods-cache nil)
1155
1156 (defun gnus-multi-decode-encoded-word-string (string)
1157   "Apply the functions from `gnus-encoded-word-methods' that match."
1158   (unless (and gnus-decode-encoded-word-methods-cache
1159                (eq gnus-newsgroup-name
1160                    (car gnus-decode-encoded-word-methods-cache)))
1161     (setq gnus-decode-encoded-word-methods-cache (list gnus-newsgroup-name))
1162     (mapcar (lambda (x)
1163               (if (symbolp x)
1164                   (nconc gnus-decode-encoded-word-methods-cache (list x))
1165                 (if (and gnus-newsgroup-name
1166                          (string-match (car x) gnus-newsgroup-name))
1167                     (nconc gnus-decode-encoded-word-methods-cache
1168                            (list (cdr x))))))
1169           gnus-decode-encoded-word-methods))
1170   (let ((xlist gnus-decode-encoded-word-methods-cache))
1171     (pop xlist)
1172     (while xlist
1173       (setq string (funcall (pop xlist) string))))
1174   string)
1175
1176 ;; Subject simplification.
1177
1178 (defun gnus-simplify-whitespace (str)
1179   "Remove excessive whitespace from STR."
1180   (let ((mystr str))
1181     ;; Multiple spaces.
1182     (while (string-match "[ \t][ \t]+" mystr)
1183       (setq mystr (concat (substring mystr 0 (match-beginning 0))
1184                           " "
1185                           (substring mystr (match-end 0)))))
1186     ;; Leading spaces.
1187     (when (string-match "^[ \t]+" mystr)
1188       (setq mystr (substring mystr (match-end 0))))
1189     ;; Trailing spaces.
1190     (when (string-match "[ \t]+$" mystr)
1191       (setq mystr (substring mystr 0 (match-beginning 0))))
1192     mystr))
1193
1194 (defsubst gnus-simplify-subject-re (subject)
1195   "Remove \"Re:\" from subject lines."
1196   (if (string-match "^[Rr][Ee]: *" subject)
1197       (substring subject (match-end 0))
1198     subject))
1199
1200 (defun gnus-simplify-subject (subject &optional re-only)
1201   "Remove `Re:' and words in parentheses.
1202 If RE-ONLY is non-nil, strip leading `Re:'s only."
1203   (let ((case-fold-search t))           ;Ignore case.
1204     ;; Remove `Re:', `Re^N:', `Re(n)', and `Re[n]:'.
1205     (when (string-match "\\`\\(re\\([[(^][0-9]+[])]?\\)?:[ \t]*\\)+" subject)
1206       (setq subject (substring subject (match-end 0))))
1207     ;; Remove uninteresting prefixes.
1208     (when (and (not re-only)
1209                gnus-simplify-ignored-prefixes
1210                (string-match gnus-simplify-ignored-prefixes subject))
1211       (setq subject (substring subject (match-end 0))))
1212     ;; Remove words in parentheses from end.
1213     (unless re-only
1214       (while (string-match "[ \t\n]*([^()]*)[ \t\n]*\\'" subject)
1215         (setq subject (substring subject 0 (match-beginning 0)))))
1216     ;; Return subject string.
1217     subject))
1218
1219 ;; Remove any leading "re:"s, any trailing paren phrases, and simplify
1220 ;; all whitespace.
1221 (defsubst gnus-simplify-buffer-fuzzy-step (regexp &optional newtext)
1222   (goto-char (point-min))
1223   (while (re-search-forward regexp nil t)
1224     (replace-match (or newtext ""))))
1225
1226 (defun gnus-simplify-buffer-fuzzy ()
1227   "Simplify string in the buffer fuzzily.
1228 The string in the accessible portion of the current buffer is simplified.
1229 It is assumed to be a single-line subject.
1230 Whitespace is generally cleaned up, and miscellaneous leading/trailing
1231 matter is removed.  Additional things can be deleted by setting
1232 `gnus-simplify-subject-fuzzy-regexp'."
1233   (let ((case-fold-search t)
1234         (modified-tick))
1235     (gnus-simplify-buffer-fuzzy-step "\t" " ")
1236
1237     (while (not (eq modified-tick (buffer-modified-tick)))
1238       (setq modified-tick (buffer-modified-tick))
1239       (cond
1240        ((listp gnus-simplify-subject-fuzzy-regexp)
1241         (mapcar 'gnus-simplify-buffer-fuzzy-step
1242                 gnus-simplify-subject-fuzzy-regexp))
1243        (gnus-simplify-subject-fuzzy-regexp
1244         (gnus-simplify-buffer-fuzzy-step gnus-simplify-subject-fuzzy-regexp)))
1245       (gnus-simplify-buffer-fuzzy-step "^ *\\[[-+?*!][-+?*!]\\] *")
1246       (gnus-simplify-buffer-fuzzy-step
1247        "^ *\\(re\\|fw\\|fwd\\)[[{(^0-9]*[])}]?[:;] *")
1248       (gnus-simplify-buffer-fuzzy-step "^[[].*:\\( .*\\)[]]$" "\\1"))
1249
1250     (gnus-simplify-buffer-fuzzy-step " *[[{(][^()\n]*[]})] *$")
1251     (gnus-simplify-buffer-fuzzy-step "  +" " ")
1252     (gnus-simplify-buffer-fuzzy-step " $")
1253     (gnus-simplify-buffer-fuzzy-step "^ +")))
1254
1255 (defun gnus-simplify-subject-fuzzy (subject)
1256   "Simplify a subject string fuzzily.
1257 See `gnus-simplify-buffer-fuzzy' for details."
1258   (save-excursion
1259     (gnus-set-work-buffer)
1260     (let ((case-fold-search t))
1261       ;; Remove uninteresting prefixes.
1262       (when (and gnus-simplify-ignored-prefixes
1263                  (string-match gnus-simplify-ignored-prefixes subject))
1264         (setq subject (substring subject (match-end 0))))
1265       (insert subject)
1266       (inline (gnus-simplify-buffer-fuzzy))
1267       (buffer-string))))
1268
1269 (defsubst gnus-simplify-subject-fully (subject)
1270   "Simplify a subject string according to gnus-summary-gather-subject-limit."
1271   (cond
1272    (gnus-simplify-subject-functions
1273     (gnus-map-function gnus-simplify-subject-functions subject))
1274    ((null gnus-summary-gather-subject-limit)
1275     (gnus-simplify-subject-re subject))
1276    ((eq gnus-summary-gather-subject-limit 'fuzzy)
1277     (gnus-simplify-subject-fuzzy subject))
1278    ((numberp gnus-summary-gather-subject-limit)
1279     (gnus-limit-string (gnus-simplify-subject-re subject)
1280                        gnus-summary-gather-subject-limit))
1281    (t
1282     subject)))
1283
1284 (defsubst gnus-subject-equal (s1 s2 &optional simple-first)
1285   "Check whether two subjects are equal.
1286 If optional argument simple-first is t, first argument is already
1287 simplified."
1288   (cond
1289    ((null simple-first)
1290     (equal (gnus-simplify-subject-fully s1)
1291            (gnus-simplify-subject-fully s2)))
1292    (t
1293     (equal s1
1294            (gnus-simplify-subject-fully s2)))))
1295
1296 (defun gnus-summary-bubble-group ()
1297   "Increase the score of the current group.
1298 This is a handy function to add to `gnus-summary-exit-hook' to
1299 increase the score of each group you read."
1300   (gnus-group-add-score gnus-newsgroup-name))
1301
1302 \f
1303 ;;;
1304 ;;; Gnus summary mode
1305 ;;;
1306
1307 (put 'gnus-summary-mode 'mode-class 'special)
1308
1309 (when t
1310   ;; Non-orthogonal keys
1311
1312   (gnus-define-keys gnus-summary-mode-map
1313     " " gnus-summary-next-page
1314     "\177" gnus-summary-prev-page
1315     [delete] gnus-summary-prev-page
1316     [backspace] gnus-summary-prev-page
1317     "\r" gnus-summary-scroll-up
1318     "\M-\r" gnus-summary-scroll-down
1319     "n" gnus-summary-next-unread-article
1320     "p" gnus-summary-prev-unread-article
1321     "N" gnus-summary-next-article
1322     "P" gnus-summary-prev-article
1323     "\M-\C-n" gnus-summary-next-same-subject
1324     "\M-\C-p" gnus-summary-prev-same-subject
1325     "\M-n" gnus-summary-next-unread-subject
1326     "\M-p" gnus-summary-prev-unread-subject
1327     "." gnus-summary-first-unread-article
1328     "," gnus-summary-best-unread-article
1329     "\M-s" gnus-summary-search-article-forward
1330     "\M-r" gnus-summary-search-article-backward
1331     "<" gnus-summary-beginning-of-article
1332     ">" gnus-summary-end-of-article
1333     "j" gnus-summary-goto-article
1334     "^" gnus-summary-refer-parent-article
1335     "\M-^" gnus-summary-refer-article
1336     "u" gnus-summary-tick-article-forward
1337     "!" gnus-summary-tick-article-forward
1338     "U" gnus-summary-tick-article-backward
1339     "d" gnus-summary-mark-as-read-forward
1340     "D" gnus-summary-mark-as-read-backward
1341     "E" gnus-summary-mark-as-expirable
1342     "\M-u" gnus-summary-clear-mark-forward
1343     "\M-U" gnus-summary-clear-mark-backward
1344     "k" gnus-summary-kill-same-subject-and-select
1345     "\C-k" gnus-summary-kill-same-subject
1346     "\M-\C-k" gnus-summary-kill-thread
1347     "\M-\C-l" gnus-summary-lower-thread
1348     "e" gnus-summary-edit-article
1349     "#" gnus-summary-mark-as-processable
1350     "\M-#" gnus-summary-unmark-as-processable
1351     "\M-\C-t" gnus-summary-toggle-threads
1352     "\M-\C-s" gnus-summary-show-thread
1353     "\M-\C-h" gnus-summary-hide-thread
1354     "\M-\C-f" gnus-summary-next-thread
1355     "\M-\C-b" gnus-summary-prev-thread
1356     [(meta down)] gnus-summary-next-thread
1357     [(meta up)] gnus-summary-prev-thread
1358     "\M-\C-u" gnus-summary-up-thread
1359     "\M-\C-d" gnus-summary-down-thread
1360     "&" gnus-summary-execute-command
1361     "c" gnus-summary-catchup-and-exit
1362     "\C-w" gnus-summary-mark-region-as-read
1363     "\C-t" gnus-summary-toggle-truncation
1364     "?" gnus-summary-mark-as-dormant
1365     "\C-c\M-\C-s" gnus-summary-limit-include-expunged
1366     "\C-c\C-s\C-n" gnus-summary-sort-by-number
1367     "\C-c\C-s\C-l" gnus-summary-sort-by-lines
1368     "\C-c\C-s\C-c" gnus-summary-sort-by-chars
1369     "\C-c\C-s\C-a" gnus-summary-sort-by-author
1370     "\C-c\C-s\C-s" gnus-summary-sort-by-subject
1371     "\C-c\C-s\C-d" gnus-summary-sort-by-date
1372     "\C-c\C-s\C-i" gnus-summary-sort-by-score
1373     "=" gnus-summary-expand-window
1374     "\C-x\C-s" gnus-summary-reselect-current-group
1375     "\M-g" gnus-summary-rescan-group
1376     "w" gnus-summary-stop-page-breaking
1377     "\C-c\C-r" gnus-summary-caesar-message
1378     "f" gnus-summary-followup
1379     "F" gnus-summary-followup-with-original
1380     "C" gnus-summary-cancel-article
1381     "r" gnus-summary-reply
1382     "R" gnus-summary-reply-with-original
1383     "\C-c\C-f" gnus-summary-mail-forward
1384     "o" gnus-summary-save-article
1385     "\C-o" gnus-summary-save-article-mail
1386     "|" gnus-summary-pipe-output
1387     "\M-k" gnus-summary-edit-local-kill
1388     "\M-K" gnus-summary-edit-global-kill
1389     ;; "V" gnus-version
1390     "\C-c\C-d" gnus-summary-describe-group
1391     "q" gnus-summary-exit
1392     "Q" gnus-summary-exit-no-update
1393     "\C-c\C-i" gnus-info-find-node
1394     gnus-mouse-2 gnus-mouse-pick-article
1395     "m" gnus-summary-mail-other-window
1396     "a" gnus-summary-post-news
1397     "x" gnus-summary-limit-to-unread
1398     "s" gnus-summary-isearch-article
1399     "t" gnus-summary-toggle-header
1400     "g" gnus-summary-show-article
1401     "l" gnus-summary-goto-last-article
1402     "\C-c\C-v\C-v" gnus-uu-decode-uu-view
1403     "\C-d" gnus-summary-enter-digest-group
1404     "\M-\C-d" gnus-summary-read-document
1405     "\M-\C-e" gnus-summary-edit-parameters
1406     "\M-\C-a" gnus-summary-customize-parameters
1407     "\C-c\C-b" gnus-bug
1408     "*" gnus-cache-enter-article
1409     "\M-*" gnus-cache-remove-article
1410     "\M-&" gnus-summary-universal-argument
1411     "\C-l" gnus-recenter
1412     "I" gnus-summary-increase-score
1413     "L" gnus-summary-lower-score
1414     "\M-i" gnus-symbolic-argument
1415     "h" gnus-summary-select-article-buffer
1416
1417     "b" gnus-article-view-part
1418     "\M-t" gnus-summary-toggle-display-buttonized
1419
1420     "V" gnus-summary-score-map
1421     "X" gnus-uu-extract-map
1422     "S" gnus-summary-send-map)
1423
1424   ;; Sort of orthogonal keymap
1425   (gnus-define-keys (gnus-summary-mark-map "M" gnus-summary-mode-map)
1426     "t" gnus-summary-tick-article-forward
1427     "!" gnus-summary-tick-article-forward
1428     "d" gnus-summary-mark-as-read-forward
1429     "r" gnus-summary-mark-as-read-forward
1430     "c" gnus-summary-clear-mark-forward
1431     " " gnus-summary-clear-mark-forward
1432     "e" gnus-summary-mark-as-expirable
1433     "x" gnus-summary-mark-as-expirable
1434     "?" gnus-summary-mark-as-dormant
1435     "b" gnus-summary-set-bookmark
1436     "B" gnus-summary-remove-bookmark
1437     "#" gnus-summary-mark-as-processable
1438     "\M-#" gnus-summary-unmark-as-processable
1439     "S" gnus-summary-limit-include-expunged
1440     "C" gnus-summary-catchup
1441     "H" gnus-summary-catchup-to-here
1442     "\C-c" gnus-summary-catchup-all
1443     "k" gnus-summary-kill-same-subject-and-select
1444     "K" gnus-summary-kill-same-subject
1445     "P" gnus-uu-mark-map)
1446
1447   (gnus-define-keys (gnus-summary-mscore-map "V" gnus-summary-mark-map)
1448     "c" gnus-summary-clear-above
1449     "u" gnus-summary-tick-above
1450     "m" gnus-summary-mark-above
1451     "k" gnus-summary-kill-below)
1452
1453   (gnus-define-keys (gnus-summary-limit-map "/" gnus-summary-mode-map)
1454     "/" gnus-summary-limit-to-subject
1455     "n" gnus-summary-limit-to-articles
1456     "w" gnus-summary-pop-limit
1457     "s" gnus-summary-limit-to-subject
1458     "a" gnus-summary-limit-to-author
1459     "u" gnus-summary-limit-to-unread
1460     "m" gnus-summary-limit-to-marks
1461     "M" gnus-summary-limit-exclude-marks
1462     "v" gnus-summary-limit-to-score
1463     "*" gnus-summary-limit-include-cached
1464     "D" gnus-summary-limit-include-dormant
1465     "T" gnus-summary-limit-include-thread
1466     "d" gnus-summary-limit-exclude-dormant
1467     "t" gnus-summary-limit-to-age
1468     "x" gnus-summary-limit-to-extra
1469     "E" gnus-summary-limit-include-expunged
1470     "c" gnus-summary-limit-exclude-childless-dormant
1471     "C" gnus-summary-limit-mark-excluded-as-read)
1472
1473   (gnus-define-keys (gnus-summary-goto-map "G" gnus-summary-mode-map)
1474     "n" gnus-summary-next-unread-article
1475     "p" gnus-summary-prev-unread-article
1476     "N" gnus-summary-next-article
1477     "P" gnus-summary-prev-article
1478     "\C-n" gnus-summary-next-same-subject
1479     "\C-p" gnus-summary-prev-same-subject
1480     "\M-n" gnus-summary-next-unread-subject
1481     "\M-p" gnus-summary-prev-unread-subject
1482     "f" gnus-summary-first-unread-article
1483     "b" gnus-summary-best-unread-article
1484     "j" gnus-summary-goto-article
1485     "g" gnus-summary-goto-subject
1486     "l" gnus-summary-goto-last-article
1487     "o" gnus-summary-pop-article)
1488
1489   (gnus-define-keys (gnus-summary-thread-map "T" gnus-summary-mode-map)
1490     "k" gnus-summary-kill-thread
1491     "l" gnus-summary-lower-thread
1492     "i" gnus-summary-raise-thread
1493     "T" gnus-summary-toggle-threads
1494     "t" gnus-summary-rethread-current
1495     "^" gnus-summary-reparent-thread
1496     "s" gnus-summary-show-thread
1497     "S" gnus-summary-show-all-threads
1498     "h" gnus-summary-hide-thread
1499     "H" gnus-summary-hide-all-threads
1500     "n" gnus-summary-next-thread
1501     "p" gnus-summary-prev-thread
1502     "u" gnus-summary-up-thread
1503     "o" gnus-summary-top-thread
1504     "d" gnus-summary-down-thread
1505     "#" gnus-uu-mark-thread
1506     "\M-#" gnus-uu-unmark-thread)
1507
1508   (gnus-define-keys (gnus-summary-buffer-map "Y" gnus-summary-mode-map)
1509     "g" gnus-summary-prepare
1510     "c" gnus-summary-insert-cached-articles)
1511
1512   (gnus-define-keys (gnus-summary-exit-map "Z" gnus-summary-mode-map)
1513     "c" gnus-summary-catchup-and-exit
1514     "C" gnus-summary-catchup-all-and-exit
1515     "E" gnus-summary-exit-no-update
1516     "Q" gnus-summary-exit
1517     "Z" gnus-summary-exit
1518     "n" gnus-summary-catchup-and-goto-next-group
1519     "R" gnus-summary-reselect-current-group
1520     "G" gnus-summary-rescan-group
1521     "N" gnus-summary-next-group
1522     "s" gnus-summary-save-newsrc
1523     "P" gnus-summary-prev-group)
1524
1525   (gnus-define-keys (gnus-summary-article-map "A" gnus-summary-mode-map)
1526     " " gnus-summary-next-page
1527     "n" gnus-summary-next-page
1528     "\177" gnus-summary-prev-page
1529     [delete] gnus-summary-prev-page
1530     "p" gnus-summary-prev-page
1531     "\r" gnus-summary-scroll-up
1532     "\M-\r" gnus-summary-scroll-down
1533     "<" gnus-summary-beginning-of-article
1534     ">" gnus-summary-end-of-article
1535     "b" gnus-summary-beginning-of-article
1536     "e" gnus-summary-end-of-article
1537     "^" gnus-summary-refer-parent-article
1538     "r" gnus-summary-refer-parent-article
1539     "D" gnus-summary-enter-digest-group
1540     "R" gnus-summary-refer-references
1541     "T" gnus-summary-refer-thread
1542     "g" gnus-summary-show-article
1543     "s" gnus-summary-isearch-article
1544     "P" gnus-summary-print-article
1545     "t" gnus-article-babel)
1546
1547   (gnus-define-keys (gnus-summary-wash-map "W" gnus-summary-mode-map)
1548     "b" gnus-article-add-buttons
1549     "B" gnus-article-add-buttons-to-head
1550     "o" gnus-article-treat-overstrike
1551     "e" gnus-article-emphasize
1552     "w" gnus-article-fill-cited-article
1553     "Q" gnus-article-fill-long-lines
1554     "C" gnus-article-capitalize-sentences
1555     "c" gnus-article-remove-cr
1556     "q" gnus-article-de-quoted-unreadable
1557     "6" gnus-article-de-base64-unreadable
1558     "Z" gnus-article-decode-HZ
1559     "h" gnus-article-wash-html
1560     "f" gnus-article-display-x-face
1561     "l" gnus-summary-stop-page-breaking
1562     "r" gnus-summary-caesar-message
1563     "t" gnus-summary-toggle-header
1564     "v" gnus-summary-verbose-headers
1565     "H" gnus-article-strip-headers-in-body
1566     "d" gnus-article-treat-dumbquotes)
1567
1568   (gnus-define-keys (gnus-summary-wash-hide-map "W" gnus-summary-wash-map)
1569     "a" gnus-article-hide
1570     "h" gnus-article-hide-headers
1571     "b" gnus-article-hide-boring-headers
1572     "s" gnus-article-hide-signature
1573     "c" gnus-article-hide-citation
1574     "C" gnus-article-hide-citation-in-followups
1575     "l" gnus-article-hide-list-identifiers
1576     "p" gnus-article-hide-pgp
1577     "B" gnus-article-strip-banner
1578     "P" gnus-article-hide-pem
1579     "\C-c" gnus-article-hide-citation-maybe)
1580
1581   (gnus-define-keys (gnus-summary-wash-highlight-map "H" gnus-summary-wash-map)
1582     "a" gnus-article-highlight
1583     "h" gnus-article-highlight-headers
1584     "c" gnus-article-highlight-citation
1585     "s" gnus-article-highlight-signature)
1586
1587   (gnus-define-keys (gnus-summary-wash-mime-map "M" gnus-summary-wash-map)
1588     "w" gnus-article-decode-mime-words
1589     "c" gnus-article-decode-charset
1590     "v" gnus-mime-view-all-parts
1591     "b" gnus-article-view-part)
1592
1593   (gnus-define-keys (gnus-summary-wash-time-map "T" gnus-summary-wash-map)
1594     "z" gnus-article-date-ut
1595     "u" gnus-article-date-ut
1596     "l" gnus-article-date-local
1597     "e" gnus-article-date-lapsed
1598     "o" gnus-article-date-original
1599     "i" gnus-article-date-iso8601
1600     "s" gnus-article-date-user)
1601
1602   (gnus-define-keys (gnus-summary-wash-empty-map "E" gnus-summary-wash-map)
1603     "t" gnus-article-remove-trailing-blank-lines
1604     "l" gnus-article-strip-leading-blank-lines
1605     "m" gnus-article-strip-multiple-blank-lines
1606     "a" gnus-article-strip-blank-lines
1607     "A" gnus-article-strip-all-blank-lines
1608     "s" gnus-article-strip-leading-space
1609     "e" gnus-article-strip-trailing-space)
1610
1611   (gnus-define-keys (gnus-summary-help-map "H" gnus-summary-mode-map)
1612     "v" gnus-version
1613     "f" gnus-summary-fetch-faq
1614     "d" gnus-summary-describe-group
1615     "h" gnus-summary-describe-briefly
1616     "i" gnus-info-find-node)
1617
1618   (gnus-define-keys (gnus-summary-backend-map "B" gnus-summary-mode-map)
1619     "e" gnus-summary-expire-articles
1620     "\M-\C-e" gnus-summary-expire-articles-now
1621     "\177" gnus-summary-delete-article
1622     [delete] gnus-summary-delete-article
1623     [backspace] gnus-summary-delete-article
1624     "m" gnus-summary-move-article
1625     "r" gnus-summary-respool-article
1626     "w" gnus-summary-edit-article
1627     "c" gnus-summary-copy-article
1628     "B" gnus-summary-crosspost-article
1629     "q" gnus-summary-respool-query
1630     "t" gnus-summary-respool-trace
1631     "i" gnus-summary-import-article
1632     "p" gnus-summary-article-posted-p)
1633
1634   (gnus-define-keys (gnus-summary-save-map "O" gnus-summary-mode-map)
1635     "o" gnus-summary-save-article
1636     "m" gnus-summary-save-article-mail
1637     "F" gnus-summary-write-article-file
1638     "r" gnus-summary-save-article-rmail
1639     "f" gnus-summary-save-article-file
1640     "b" gnus-summary-save-article-body-file
1641     "h" gnus-summary-save-article-folder
1642     "v" gnus-summary-save-article-vm
1643     "p" gnus-summary-pipe-output
1644     "s" gnus-soup-add-article)
1645
1646   (gnus-define-keys (gnus-summary-mime-map "K" gnus-summary-mode-map)
1647     "b" gnus-summary-display-buttonized
1648     "m" gnus-summary-repair-multipart
1649     "v" gnus-article-view-part
1650     "o" gnus-article-save-part
1651     "c" gnus-article-copy-part
1652     "e" gnus-article-externalize-part
1653     "i" gnus-article-inline-part
1654     "|" gnus-article-pipe-part))
1655
1656 (defun gnus-summary-make-menu-bar ()
1657   (gnus-turn-off-edit-menu 'summary)
1658
1659   (unless (boundp 'gnus-summary-misc-menu)
1660
1661     (easy-menu-define
1662      gnus-summary-kill-menu gnus-summary-mode-map ""
1663      (cons
1664       "Score"
1665       (nconc
1666        (list
1667         ["Enter score..." gnus-summary-score-entry t]
1668         ["Customize" gnus-score-customize t])
1669        (gnus-make-score-map 'increase)
1670        (gnus-make-score-map 'lower)
1671        '(("Mark"
1672           ["Kill below" gnus-summary-kill-below t]
1673           ["Mark above" gnus-summary-mark-above t]
1674           ["Tick above" gnus-summary-tick-above t]
1675           ["Clear above" gnus-summary-clear-above t])
1676          ["Current score" gnus-summary-current-score t]
1677          ["Set score" gnus-summary-set-score t]
1678          ["Switch current score file..." gnus-score-change-score-file t]
1679          ["Set mark below..." gnus-score-set-mark-below t]
1680          ["Set expunge below..." gnus-score-set-expunge-below t]
1681          ["Edit current score file" gnus-score-edit-current-scores t]
1682          ["Edit score file" gnus-score-edit-file t]
1683          ["Trace score" gnus-score-find-trace t]
1684          ["Find words" gnus-score-find-favourite-words t]
1685          ["Rescore buffer" gnus-summary-rescore t]
1686          ["Increase score..." gnus-summary-increase-score t]
1687          ["Lower score..." gnus-summary-lower-score t]))))
1688
1689     ;; Define both the Article menu in the summary buffer and the equivalent
1690     ;; Commands menu in the article buffer here for consistency.
1691     (let ((innards
1692            '(("Hide"
1693               ["All" gnus-article-hide t]
1694               ["Headers" gnus-article-hide-headers t]
1695               ["Signature" gnus-article-hide-signature t]
1696               ["Citation" gnus-article-hide-citation t]
1697               ["List identifiers" gnus-article-hide-list-identifiers t]
1698               ["PGP" gnus-article-hide-pgp t]
1699               ["Banner" gnus-article-strip-banner t]
1700               ["Boring headers" gnus-article-hide-boring-headers t])
1701              ("Highlight"
1702               ["All" gnus-article-highlight t]
1703               ["Headers" gnus-article-highlight-headers t]
1704               ["Signature" gnus-article-highlight-signature t]
1705               ["Citation" gnus-article-highlight-citation t])
1706              ("MIME"
1707               ["Words" gnus-article-decode-mime-words t]
1708               ["Charset" gnus-article-decode-charset t]
1709               ["QP" gnus-article-de-quoted-unreadable t]
1710               ["Base64" gnus-article-de-base64-unreadable t]
1711               ["View all" gnus-mime-view-all-parts t])
1712              ("Date"
1713               ["Local" gnus-article-date-local t]
1714               ["ISO8601" gnus-article-date-iso8601 t]
1715               ["UT" gnus-article-date-ut t]
1716               ["Original" gnus-article-date-original t]
1717               ["Lapsed" gnus-article-date-lapsed t]
1718               ["User-defined" gnus-article-date-user t])
1719              ("Washing"
1720               ("Remove Blanks"
1721                ["Leading" gnus-article-strip-leading-blank-lines t]
1722                ["Multiple" gnus-article-strip-multiple-blank-lines t]
1723                ["Trailing" gnus-article-remove-trailing-blank-lines t]
1724                ["All of the above" gnus-article-strip-blank-lines t]
1725                ["All" gnus-article-strip-all-blank-lines t]
1726                ["Leading space" gnus-article-strip-leading-space t]
1727                ["Trailing space" gnus-article-strip-trailing-space t])
1728               ["Overstrike" gnus-article-treat-overstrike t]
1729               ["Dumb quotes" gnus-article-treat-dumbquotes t]
1730               ["Emphasis" gnus-article-emphasize t]
1731               ["Word wrap" gnus-article-fill-cited-article t]
1732               ["Fill long lines" gnus-article-fill-long-lines t]
1733               ["Capitalize sentences" gnus-article-capitalize-sentences t]
1734               ["CR" gnus-article-remove-cr t]
1735               ["Show X-Face" gnus-article-display-x-face t]
1736               ["Quoted-Printable" gnus-article-de-quoted-unreadable t]
1737               ["Base64" gnus-article-de-base64-unreadable t]
1738               ["Rot 13" gnus-summary-caesar-message
1739                :help "\"Caesar rotate\" article by 13"]
1740               ["Unix pipe" gnus-summary-pipe-message t]
1741               ["Add buttons" gnus-article-add-buttons t]
1742               ["Add buttons to head" gnus-article-add-buttons-to-head t]
1743               ["Stop page breaking" gnus-summary-stop-page-breaking t]
1744               ["Verbose header" gnus-summary-verbose-headers t]
1745               ["Toggle header" gnus-summary-toggle-header t]
1746               ["Html" gnus-article-wash-html t]
1747               ["HZ" gnus-article-decode-HZ t])
1748              ("Output"
1749               ["Save in default format" gnus-summary-save-article
1750                :help "Save article using default method"]
1751               ["Save in file" gnus-summary-save-article-file
1752                :help "Save article in file"]
1753               ["Save in Unix mail format" gnus-summary-save-article-mail t]
1754               ["Save in MH folder" gnus-summary-save-article-folder t]
1755               ["Save in VM folder" gnus-summary-save-article-vm t]
1756               ["Save in RMAIL mbox" gnus-summary-save-article-rmail t]
1757               ["Save body in file" gnus-summary-save-article-body-file t]
1758               ["Pipe through a filter" gnus-summary-pipe-output t]
1759               ["Add to SOUP packet" gnus-soup-add-article t]
1760               ["Print" gnus-summary-print-article t])
1761              ("Backend"
1762               ["Respool article..." gnus-summary-respool-article t]
1763               ["Move article..." gnus-summary-move-article
1764                (gnus-check-backend-function
1765                 'request-move-article gnus-newsgroup-name)]
1766               ["Copy article..." gnus-summary-copy-article t]
1767               ["Crosspost article..." gnus-summary-crosspost-article
1768                (gnus-check-backend-function
1769                 'request-replace-article gnus-newsgroup-name)]
1770               ["Import file..." gnus-summary-import-article t]
1771               ["Check if posted" gnus-summary-article-posted-p t]
1772               ["Edit article" gnus-summary-edit-article
1773                (not (gnus-group-read-only-p))]
1774               ["Delete article" gnus-summary-delete-article
1775                (gnus-check-backend-function
1776                 'request-expire-articles gnus-newsgroup-name)]
1777               ["Query respool" gnus-summary-respool-query t]
1778               ["Trace respool" gnus-summary-respool-trace t]
1779               ["Delete expirable articles" gnus-summary-expire-articles-now
1780                (gnus-check-backend-function
1781                 'request-expire-articles gnus-newsgroup-name)])
1782              ("Extract"
1783               ["Uudecode" gnus-uu-decode-uu
1784                :help "Decode uuencoded article(s)"]
1785               ["Uudecode and save" gnus-uu-decode-uu-and-save t]
1786               ["Unshar" gnus-uu-decode-unshar t]
1787               ["Unshar and save" gnus-uu-decode-unshar-and-save t]
1788               ["Save" gnus-uu-decode-save t]
1789               ["Binhex" gnus-uu-decode-binhex t]
1790               ["Postscript" gnus-uu-decode-postscript t])
1791              ("Cache"
1792               ["Enter article" gnus-cache-enter-article t]
1793               ["Remove article" gnus-cache-remove-article t])
1794              ["Translate" gnus-article-babel t]
1795              ["Select article buffer" gnus-summary-select-article-buffer t]
1796              ["Enter digest buffer" gnus-summary-enter-digest-group t]
1797              ["Isearch article..." gnus-summary-isearch-article t]
1798              ["Beginning of the article" gnus-summary-beginning-of-article t]
1799              ["End of the article" gnus-summary-end-of-article t]
1800              ["Fetch parent of article" gnus-summary-refer-parent-article t]
1801              ["Fetch referenced articles" gnus-summary-refer-references t]
1802              ["Fetch current thread" gnus-summary-refer-thread t]
1803              ["Fetch article with id..." gnus-summary-refer-article t]
1804              ["Redisplay" gnus-summary-show-article t])))
1805       (easy-menu-define
1806        gnus-summary-article-menu gnus-summary-mode-map ""
1807        (cons "Article" innards))
1808
1809       (easy-menu-define
1810        gnus-article-commands-menu gnus-article-mode-map ""
1811        (cons "Commands" innards)))
1812
1813     (easy-menu-define
1814      gnus-summary-thread-menu gnus-summary-mode-map ""
1815      '("Threads"
1816        ["Toggle threading" gnus-summary-toggle-threads t]
1817        ["Hide threads" gnus-summary-hide-all-threads t]
1818        ["Show threads" gnus-summary-show-all-threads t]
1819        ["Hide thread" gnus-summary-hide-thread t]
1820        ["Show thread" gnus-summary-show-thread t]
1821        ["Go to next thread" gnus-summary-next-thread t]
1822        ["Go to previous thread" gnus-summary-prev-thread t]
1823        ["Go down thread" gnus-summary-down-thread t]
1824        ["Go up thread" gnus-summary-up-thread t]
1825        ["Top of thread" gnus-summary-top-thread t]
1826        ["Mark thread as read" gnus-summary-kill-thread t]
1827        ["Lower thread score" gnus-summary-lower-thread t]
1828        ["Raise thread score" gnus-summary-raise-thread t]
1829        ["Rethread current" gnus-summary-rethread-current t]))
1830
1831     (easy-menu-define
1832      gnus-summary-post-menu gnus-summary-mode-map ""
1833      '("Post"
1834        ["Post an article" gnus-summary-post-news
1835         :help "Post an article"]
1836        ["Followup" gnus-summary-followup
1837         :help "Post followup to this article"]
1838        ["Followup and yank" gnus-summary-followup-with-original
1839         :help "Post followup to this article, quoting its contents"]
1840        ["Supersede article" gnus-summary-supersede-article t]
1841        ["Cancel article" gnus-summary-cancel-article
1842         :help "Cancel an article you posted"]
1843        ["Reply" gnus-summary-reply t]
1844        ["Reply and yank" gnus-summary-reply-with-original t]
1845        ["Wide reply" gnus-summary-wide-reply t]
1846        ["Wide reply and yank" gnus-summary-wide-reply-with-original
1847         :help "Mail a reply, quoting this article"]
1848        ["Mail forward" gnus-summary-mail-forward t]
1849        ["Post forward" gnus-summary-post-forward t]
1850        ["Digest and mail" gnus-uu-digest-mail-forward t]
1851        ["Digest and post" gnus-uu-digest-post-forward t]
1852        ["Resend message" gnus-summary-resend-message t]
1853        ["Send bounced mail" gnus-summary-resend-bounced-mail t]
1854        ["Send a mail" gnus-summary-mail-other-window t]
1855        ["Uuencode and post" gnus-uu-post-news
1856         :help "Post a uuencoded article"]
1857        ["Followup via news" gnus-summary-followup-to-mail t]
1858        ["Followup via news and yank"
1859         gnus-summary-followup-to-mail-with-original t]
1860        ;;("Draft"
1861        ;;["Send" gnus-summary-send-draft t]
1862        ;;["Send bounced" gnus-resend-bounced-mail t])
1863        ))
1864
1865     (easy-menu-define
1866      gnus-summary-misc-menu gnus-summary-mode-map ""
1867      '("Misc"
1868        ("Mark Read"
1869         ["Mark as read" gnus-summary-mark-as-read-forward t]
1870         ["Mark same subject and select"
1871          gnus-summary-kill-same-subject-and-select t]
1872         ["Mark same subject" gnus-summary-kill-same-subject t]
1873         ["Catchup" gnus-summary-catchup
1874          :help "Mark unread articles in this group as read"]
1875         ["Catchup all" gnus-summary-catchup-all t]
1876         ["Catchup to here" gnus-summary-catchup-to-here t]
1877         ["Catchup region" gnus-summary-mark-region-as-read t]
1878         ["Mark excluded" gnus-summary-limit-mark-excluded-as-read t])
1879        ("Mark Various"
1880         ["Tick" gnus-summary-tick-article-forward t]
1881         ["Mark as dormant" gnus-summary-mark-as-dormant t]
1882         ["Remove marks" gnus-summary-clear-mark-forward t]
1883         ["Set expirable mark" gnus-summary-mark-as-expirable t]
1884         ["Set bookmark" gnus-summary-set-bookmark t]
1885         ["Remove bookmark" gnus-summary-remove-bookmark t])
1886        ("Mark Limit"
1887         ["Marks..." gnus-summary-limit-to-marks t]
1888         ["Subject..." gnus-summary-limit-to-subject t]
1889         ["Author..." gnus-summary-limit-to-author t]
1890         ["Age..." gnus-summary-limit-to-age t]
1891         ["Extra..." gnus-summary-limit-to-extra t]
1892         ["Score" gnus-summary-limit-to-score t]
1893         ["Unread" gnus-summary-limit-to-unread t]
1894         ["Non-dormant" gnus-summary-limit-exclude-dormant t]
1895         ["Articles" gnus-summary-limit-to-articles t]
1896         ["Pop limit" gnus-summary-pop-limit t]
1897         ["Show dormant" gnus-summary-limit-include-dormant t]
1898         ["Hide childless dormant"
1899          gnus-summary-limit-exclude-childless-dormant t]
1900         ;;["Hide thread" gnus-summary-limit-exclude-thread t]
1901         ["Hide marked" gnus-summary-limit-exclude-marks t]
1902         ["Show expunged" gnus-summary-show-all-expunged t])
1903        ("Process Mark"
1904         ["Set mark" gnus-summary-mark-as-processable t]
1905         ["Remove mark" gnus-summary-unmark-as-processable t]
1906         ["Remove all marks" gnus-summary-unmark-all-processable t]
1907         ["Mark above" gnus-uu-mark-over t]
1908         ["Mark series" gnus-uu-mark-series t]
1909         ["Mark region" gnus-uu-mark-region t]
1910         ["Unmark region" gnus-uu-unmark-region t]
1911         ["Mark by regexp..." gnus-uu-mark-by-regexp t]
1912         ["Unmark by regexp..." gnus-uu-unmark-by-regexp t]
1913         ["Mark all" gnus-uu-mark-all t]
1914         ["Mark buffer" gnus-uu-mark-buffer t]
1915         ["Mark sparse" gnus-uu-mark-sparse t]
1916         ["Mark thread" gnus-uu-mark-thread t]
1917         ["Unmark thread" gnus-uu-unmark-thread t]
1918         ("Process Mark Sets"
1919          ["Kill" gnus-summary-kill-process-mark t]
1920          ["Yank" gnus-summary-yank-process-mark
1921           gnus-newsgroup-process-stack]
1922          ["Save" gnus-summary-save-process-mark t]))
1923        ("Scroll article"
1924         ["Page forward" gnus-summary-next-page
1925          :help "Show next page of article"]
1926         ["Page backward" gnus-summary-prev-page
1927          :help "Show previous page of article"]
1928         ["Line forward" gnus-summary-scroll-up t])
1929        ("Move"
1930         ["Next unread article" gnus-summary-next-unread-article t]
1931         ["Previous unread article" gnus-summary-prev-unread-article t]
1932         ["Next article" gnus-summary-next-article t]
1933         ["Previous article" gnus-summary-prev-article t]
1934         ["Next unread subject" gnus-summary-next-unread-subject t]
1935         ["Previous unread subject" gnus-summary-prev-unread-subject t]
1936         ["Next article same subject" gnus-summary-next-same-subject t]
1937         ["Previous article same subject" gnus-summary-prev-same-subject t]
1938         ["First unread article" gnus-summary-first-unread-article t]
1939         ["Best unread article" gnus-summary-best-unread-article t]
1940         ["Go to subject number..." gnus-summary-goto-subject t]
1941         ["Go to article number..." gnus-summary-goto-article t]
1942         ["Go to the last article" gnus-summary-goto-last-article t]
1943         ["Pop article off history" gnus-summary-pop-article t])
1944        ("Sort"
1945         ["Sort by number" gnus-summary-sort-by-number t]
1946         ["Sort by author" gnus-summary-sort-by-author t]
1947         ["Sort by subject" gnus-summary-sort-by-subject t]
1948         ["Sort by date" gnus-summary-sort-by-date t]
1949         ["Sort by score" gnus-summary-sort-by-score t]
1950         ["Sort by lines" gnus-summary-sort-by-lines t]
1951         ["Sort by characters" gnus-summary-sort-by-chars t])
1952        ("Help"
1953         ["Fetch group FAQ" gnus-summary-fetch-faq t]
1954         ["Describe group" gnus-summary-describe-group t]
1955         ["Read manual" gnus-info-find-node t])
1956        ("Modes"
1957         ["Pick and read" gnus-pick-mode t]
1958         ["Binary" gnus-binary-mode t])
1959        ("Regeneration"
1960         ["Regenerate" gnus-summary-prepare t]
1961         ["Insert cached articles" gnus-summary-insert-cached-articles t]
1962         ["Toggle threading" gnus-summary-toggle-threads t])
1963        ["Filter articles..." gnus-summary-execute-command t]
1964        ["Run command on subjects..." gnus-summary-universal-argument t]
1965        ["Search articles forward..." gnus-summary-search-article-forward t]
1966        ["Search articles backward..." gnus-summary-search-article-backward t]
1967        ["Toggle line truncation" gnus-summary-toggle-truncation t]
1968        ["Expand window" gnus-summary-expand-window t]
1969        ["Expire expirable articles" gnus-summary-expire-articles
1970         (gnus-check-backend-function
1971          'request-expire-articles gnus-newsgroup-name)]
1972        ["Edit local kill file" gnus-summary-edit-local-kill t]
1973        ["Edit main kill file" gnus-summary-edit-global-kill t]
1974        ["Edit group parameters" gnus-summary-edit-parameters t]
1975        ["Customize group parameters" gnus-summary-customize-parameters t]
1976        ["Send a bug report" gnus-bug t]
1977        ("Exit"
1978         ["Catchup and exit" gnus-summary-catchup-and-exit
1979          :help "Mark unread articles in this group as read, then exit"]
1980         ["Catchup all and exit" gnus-summary-catchup-all-and-exit t]
1981         ["Catchup and goto next" gnus-summary-catchup-and-goto-next-group t]
1982         ["Exit group" gnus-summary-exit
1983          :help "Exit current group, return to group selection mode"]
1984         ["Exit group without updating" gnus-summary-exit-no-update t]
1985         ["Exit and goto next group" gnus-summary-next-group t]
1986         ["Exit and goto prev group" gnus-summary-prev-group t]
1987         ["Reselect group" gnus-summary-reselect-current-group t]
1988         ["Rescan group" gnus-summary-rescan-group t]
1989         ["Update dribble" gnus-summary-save-newsrc t])))
1990
1991     (gnus-run-hooks 'gnus-summary-menu-hook)))
1992
1993 (defvar gnus-summary-tool-bar-map nil)
1994
1995 ;; Emacs 21 tool bar.  Should be no-op otherwise.
1996 (defun gnus-summary-make-tool-bar ()
1997   (if (and (fboundp 'tool-bar-add-item-from-menu)
1998            (default-value 'tool-bar-mode)
1999            (not gnus-summary-tool-bar-map))
2000       (setq gnus-summary-tool-bar-map
2001             (let ((tool-bar-map (make-sparse-keymap)))
2002               (tool-bar-add-item-from-menu
2003                'gnus-summary-prev-unread "prev-ur" gnus-summary-mode-map)
2004               (tool-bar-add-item-from-menu
2005                'gnus-summary-next-unread "next-ur" gnus-summary-mode-map)
2006               (tool-bar-add-item-from-menu
2007                'gnus-summary-post-news "post" gnus-summary-mode-map)
2008               (tool-bar-add-item-from-menu
2009                'gnus-summary-followup-with-original "fuwo" gnus-summary-mode-map)
2010               (tool-bar-add-item-from-menu
2011                'gnus-summary-followup "followup" gnus-summary-mode-map)
2012               (tool-bar-add-item-from-menu
2013                'gnus-summary-reply-with-original "reply-wo" gnus-summary-mode-map)
2014               (tool-bar-add-item-from-menu
2015                'gnus-summary-reply "reply" gnus-summary-mode-map)
2016               (tool-bar-add-item-from-menu
2017                'gnus-summary-caesar-message "rot13" gnus-summary-mode-map)
2018               (tool-bar-add-item-from-menu
2019                'gnus-uu-decode-uu "uu-decode" gnus-summary-mode-map)
2020               (tool-bar-add-item-from-menu
2021                'gnus-summary-save-article-file "save-aif" gnus-summary-mode-map)
2022               (tool-bar-add-item-from-menu
2023                'gnus-summary-save-article "save-art" gnus-summary-mode-map)
2024               (tool-bar-add-item-from-menu
2025                'gnus-uu-post-news "uu-post" gnus-summary-mode-map)
2026               (tool-bar-add-item-from-menu
2027                'gnus-summary-catchup "catchup" gnus-summary-mode-map)
2028               (tool-bar-add-item-from-menu
2029                'gnus-summary-catchup-and-exit "cu-exit" gnus-summary-mode-map)
2030               (tool-bar-add-item-from-menu
2031                'gnus-summary-exit "exit-summ" gnus-summary-mode-map)
2032               tool-bar-map)))
2033   (if gnus-summary-tool-bar-map
2034       (set (make-local-variable 'tool-bar-map) gnus-summary-tool-bar-map)))
2035
2036 (defun gnus-score-set-default (var value)
2037   "A version of set that updates the GNU Emacs menu-bar."
2038   (set var value)
2039   ;; It is the message that forces the active status to be updated.
2040   (message ""))
2041
2042 (defun gnus-make-score-map (type)
2043   "Make a summary score map of type TYPE."
2044   (if t
2045       nil
2046     (let ((headers '(("author" "from" string)
2047                      ("subject" "subject" string)
2048                      ("article body" "body" string)
2049                      ("article head" "head" string)
2050                      ("xref" "xref" string)
2051                      ("extra header" "extra" string)
2052                      ("lines" "lines" number)
2053                      ("followups to author" "followup" string)))
2054           (types '((number ("less than" <)
2055                            ("greater than" >)
2056                            ("equal" =))
2057                    (string ("substring" s)
2058                            ("exact string" e)
2059                            ("fuzzy string" f)
2060                            ("regexp" r))))
2061           (perms '(("temporary" (current-time-string))
2062                    ("permanent" nil)
2063                    ("immediate" now)))
2064           header)
2065       (list
2066        (apply
2067         'nconc
2068         (list
2069          (if (eq type 'lower)
2070              "Lower score"
2071            "Increase score"))
2072         (let (outh)
2073           (while headers
2074             (setq header (car headers))
2075             (setq outh
2076                   (cons
2077                    (apply
2078                     'nconc
2079                     (list (car header))
2080                     (let ((ts (cdr (assoc (nth 2 header) types)))
2081                           outt)
2082                       (while ts
2083                         (setq outt
2084                               (cons
2085                                (apply
2086                                 'nconc
2087                                 (list (caar ts))
2088                                 (let ((ps perms)
2089                                       outp)
2090                                   (while ps
2091                                     (setq outp
2092                                           (cons
2093                                            (vector
2094                                             (caar ps)
2095                                             (list
2096                                              'gnus-summary-score-entry
2097                                              (nth 1 header)
2098                                              (if (or (string= (nth 1 header)
2099                                                               "head")
2100                                                      (string= (nth 1 header)
2101                                                               "body"))
2102                                                  ""
2103                                                (list 'gnus-summary-header
2104                                                      (nth 1 header)))
2105                                              (list 'quote (nth 1 (car ts)))
2106                                              (list 'gnus-score-delta-default
2107                                                    nil)
2108                                              (nth 1 (car ps))
2109                                              t)
2110                                             t)
2111                                            outp))
2112                                     (setq ps (cdr ps)))
2113                                   (list (nreverse outp))))
2114                                outt))
2115                         (setq ts (cdr ts)))
2116                       (list (nreverse outt))))
2117                    outh))
2118             (setq headers (cdr headers)))
2119           (list (nreverse outh))))))))
2120
2121 \f
2122
2123 (defun gnus-summary-mode (&optional group)
2124   "Major mode for reading articles.
2125
2126 All normal editing commands are switched off.
2127 \\<gnus-summary-mode-map>
2128 Each line in this buffer represents one article.  To read an
2129 article, you can, for instance, type `\\[gnus-summary-next-page]'.  To move forwards
2130 and backwards while displaying articles, type `\\[gnus-summary-next-unread-article]' and `\\[gnus-summary-prev-unread-article]',
2131 respectively.
2132
2133 You can also post articles and send mail from this buffer.  To
2134 follow up an article, type `\\[gnus-summary-followup]'.  To mail a reply to the author
2135 of an article, type `\\[gnus-summary-reply]'.
2136
2137 There are approx. one gazillion commands you can execute in this
2138 buffer; read the info pages for more information (`\\[gnus-info-find-node]').
2139
2140 The following commands are available:
2141
2142 \\{gnus-summary-mode-map}"
2143   (interactive)
2144   (kill-all-local-variables)
2145   (when (gnus-visual-p 'summary-menu 'menu)
2146     (gnus-summary-make-menu-bar)
2147     (gnus-summary-make-tool-bar))
2148   (gnus-summary-make-local-variables)
2149   (gnus-make-thread-indent-array)
2150   (gnus-simplify-mode-line)
2151   (setq major-mode 'gnus-summary-mode)
2152   (setq mode-name "Summary")
2153   (make-local-variable 'minor-mode-alist)
2154   (use-local-map gnus-summary-mode-map)
2155   (buffer-disable-undo)
2156   (setq buffer-read-only t)             ;Disable modification
2157   (setq truncate-lines t)
2158   (setq selective-display t)
2159   (setq selective-display-ellipses t)   ;Display `...'
2160   (gnus-summary-set-display-table)
2161   (gnus-set-default-directory)
2162   (setq gnus-newsgroup-name group)
2163   (make-local-variable 'gnus-summary-line-format)
2164   (make-local-variable 'gnus-summary-line-format-spec)
2165   (make-local-variable 'gnus-summary-dummy-line-format)
2166   (make-local-variable 'gnus-summary-dummy-line-format-spec)
2167   (make-local-variable 'gnus-summary-mark-positions)
2168   (make-local-hook 'pre-command-hook)
2169   (add-hook 'pre-command-hook 'gnus-set-global-variables nil t)
2170   (gnus-run-hooks 'gnus-summary-mode-hook)
2171   (mm-enable-multibyte-mule4)
2172   (gnus-update-format-specifications nil 'summary 'summary-mode 'summary-dummy)
2173   (gnus-update-summary-mark-positions))
2174
2175 (defun gnus-summary-make-local-variables ()
2176   "Make all the local summary buffer variables."
2177   (let (global)
2178     (dolist (local gnus-summary-local-variables)
2179       (if (consp local)
2180           (progn
2181             (if (eq (cdr local) 'global)
2182                 ;; Copy the global value of the variable.
2183                 (setq global (symbol-value (car local)))
2184               ;; Use the value from the list.
2185               (setq global (eval (cdr local))))
2186             (set (make-local-variable (car local)) global))
2187         ;; Simple nil-valued local variable.
2188         (set (make-local-variable local) nil)))))
2189
2190 (defun gnus-summary-clear-local-variables ()
2191   (let ((locals gnus-summary-local-variables))
2192     (while locals
2193       (if (consp (car locals))
2194           (and (vectorp (caar locals))
2195                (set (caar locals) nil))
2196         (and (vectorp (car locals))
2197              (set (car locals) nil)))
2198       (setq locals (cdr locals)))))
2199
2200 ;; Summary data functions.
2201
2202 (defmacro gnus-data-number (data)
2203   `(car ,data))
2204
2205 (defmacro gnus-data-set-number (data number)
2206   `(setcar ,data ,number))
2207
2208 (defmacro gnus-data-mark (data)
2209   `(nth 1 ,data))
2210
2211 (defmacro gnus-data-set-mark (data mark)
2212   `(setcar (nthcdr 1 ,data) ,mark))
2213
2214 (defmacro gnus-data-pos (data)
2215   `(nth 2 ,data))
2216
2217 (defmacro gnus-data-set-pos (data pos)
2218   `(setcar (nthcdr 2 ,data) ,pos))
2219
2220 (defmacro gnus-data-header (data)
2221   `(nth 3 ,data))
2222
2223 (defmacro gnus-data-set-header (data header)
2224   `(setf (nth 3 ,data) ,header))
2225
2226 (defmacro gnus-data-level (data)
2227   `(nth 4 ,data))
2228
2229 (defmacro gnus-data-unread-p (data)
2230   `(= (nth 1 ,data) gnus-unread-mark))
2231
2232 (defmacro gnus-data-read-p (data)
2233   `(/= (nth 1 ,data) gnus-unread-mark))
2234
2235 (defmacro gnus-data-pseudo-p (data)
2236   `(consp (nth 3 ,data)))
2237
2238 (defmacro gnus-data-find (number)
2239   `(assq ,number gnus-newsgroup-data))
2240
2241 (defmacro gnus-data-find-list (number &optional data)
2242   `(let ((bdata ,(or data 'gnus-newsgroup-data)))
2243      (memq (assq ,number bdata)
2244            bdata)))
2245
2246 (defmacro gnus-data-make (number mark pos header level)
2247   `(list ,number ,mark ,pos ,header ,level))
2248
2249 (defun gnus-data-enter (after-article number mark pos header level offset)
2250   (let ((data (gnus-data-find-list after-article)))
2251     (unless data
2252       (error "No such article: %d" after-article))
2253     (setcdr data (cons (gnus-data-make number mark pos header level)
2254                        (cdr data)))
2255     (setq gnus-newsgroup-data-reverse nil)
2256     (gnus-data-update-list (cddr data) offset)))
2257
2258 (defun gnus-data-enter-list (after-article list &optional offset)
2259   (when list
2260     (let ((data (and after-article (gnus-data-find-list after-article)))
2261           (ilist list))
2262       (if (not (or data
2263                    after-article))
2264           (let ((odata gnus-newsgroup-data))
2265             (setq gnus-newsgroup-data (nconc list gnus-newsgroup-data))
2266             (when offset
2267               (gnus-data-update-list odata offset)))
2268         ;; Find the last element in the list to be spliced into the main
2269         ;; list.
2270         (while (cdr list)
2271           (setq list (cdr list)))
2272         (if (not data)
2273             (progn
2274               (setcdr list gnus-newsgroup-data)
2275               (setq gnus-newsgroup-data ilist)
2276               (when offset
2277                 (gnus-data-update-list (cdr list) offset)))
2278           (setcdr list (cdr data))
2279           (setcdr data ilist)
2280           (when offset
2281             (gnus-data-update-list (cdr list) offset))))
2282       (setq gnus-newsgroup-data-reverse nil))))
2283
2284 (defun gnus-data-remove (article &optional offset)
2285   (let ((data gnus-newsgroup-data))
2286     (if (= (gnus-data-number (car data)) article)
2287         (progn
2288           (setq gnus-newsgroup-data (cdr gnus-newsgroup-data)
2289                 gnus-newsgroup-data-reverse nil)
2290           (when offset
2291             (gnus-data-update-list gnus-newsgroup-data offset)))
2292       (while (cdr data)
2293         (when (= (gnus-data-number (cadr data)) article)
2294           (setcdr data (cddr data))
2295           (when offset
2296             (gnus-data-update-list (cdr data) offset))
2297           (setq data nil
2298                 gnus-newsgroup-data-reverse nil))
2299         (setq data (cdr data))))))
2300
2301 (defmacro gnus-data-list (backward)
2302   `(if ,backward
2303        (or gnus-newsgroup-data-reverse
2304            (setq gnus-newsgroup-data-reverse
2305                  (reverse gnus-newsgroup-data)))
2306      gnus-newsgroup-data))
2307
2308 (defun gnus-data-update-list (data offset)
2309   "Add OFFSET to the POS of all data entries in DATA."
2310   (setq gnus-newsgroup-data-reverse nil)
2311   (while data
2312     (setcar (nthcdr 2 (car data)) (+ offset (nth 2 (car data))))
2313     (setq data (cdr data))))
2314
2315 (defun gnus-summary-article-pseudo-p (article)
2316   "Say whether this article is a pseudo article or not."
2317   (not (vectorp (gnus-data-header (gnus-data-find article)))))
2318
2319 (defmacro gnus-summary-article-sparse-p (article)
2320   "Say whether this article is a sparse article or not."
2321   `(memq ,article gnus-newsgroup-sparse))
2322
2323 (defmacro gnus-summary-article-ancient-p (article)
2324   "Say whether this article is a sparse article or not."
2325   `(memq ,article gnus-newsgroup-ancient))
2326
2327 (defun gnus-article-parent-p (number)
2328   "Say whether this article is a parent or not."
2329   (let ((data (gnus-data-find-list number)))
2330     (and (cdr data)                     ; There has to be an article after...
2331          (< (gnus-data-level (car data)) ; And it has to have a higher level.
2332             (gnus-data-level (nth 1 data))))))
2333
2334 (defun gnus-article-children (number)
2335   "Return a list of all children to NUMBER."
2336   (let* ((data (gnus-data-find-list number))
2337          (level (gnus-data-level (car data)))
2338          children)
2339     (setq data (cdr data))
2340     (while (and data
2341                 (= (gnus-data-level (car data)) (1+ level)))
2342       (push (gnus-data-number (car data)) children)
2343       (setq data (cdr data)))
2344     children))
2345
2346 (defmacro gnus-summary-skip-intangible ()
2347   "If the current article is intangible, then jump to a different article."
2348   '(let ((to (get-text-property (point) 'gnus-intangible)))
2349      (and to (gnus-summary-goto-subject to))))
2350
2351 (defmacro gnus-summary-article-intangible-p ()
2352   "Say whether this article is intangible or not."
2353   '(get-text-property (point) 'gnus-intangible))
2354
2355 (defun gnus-article-read-p (article)
2356   "Say whether ARTICLE is read or not."
2357   (not (or (memq article gnus-newsgroup-marked)
2358            (memq article gnus-newsgroup-unreads)
2359            (memq article gnus-newsgroup-unselected)
2360            (memq article gnus-newsgroup-dormant))))
2361
2362 ;; Some summary mode macros.
2363
2364 (defmacro gnus-summary-article-number ()
2365   "The article number of the article on the current line.
2366 If there isn's an article number here, then we return the current
2367 article number."
2368   '(progn
2369      (gnus-summary-skip-intangible)
2370      (or (get-text-property (point) 'gnus-number)
2371          (gnus-summary-last-subject))))
2372
2373 (defmacro gnus-summary-article-header (&optional number)
2374   "Return the header of article NUMBER."
2375   `(gnus-data-header (gnus-data-find
2376                       ,(or number '(gnus-summary-article-number)))))
2377
2378 (defmacro gnus-summary-thread-level (&optional number)
2379   "Return the level of thread that starts with article NUMBER."
2380   `(if (and (eq gnus-summary-make-false-root 'dummy)
2381             (get-text-property (point) 'gnus-intangible))
2382        0
2383      (gnus-data-level (gnus-data-find
2384                        ,(or number '(gnus-summary-article-number))))))
2385
2386 (defmacro gnus-summary-article-mark (&optional number)
2387   "Return the mark of article NUMBER."
2388   `(gnus-data-mark (gnus-data-find
2389                     ,(or number '(gnus-summary-article-number)))))
2390
2391 (defmacro gnus-summary-article-pos (&optional number)
2392   "Return the position of the line of article NUMBER."
2393   `(gnus-data-pos (gnus-data-find
2394                    ,(or number '(gnus-summary-article-number)))))
2395
2396 (defalias 'gnus-summary-subject-string 'gnus-summary-article-subject)
2397 (defmacro gnus-summary-article-subject (&optional number)
2398   "Return current subject string or nil if nothing."
2399   `(let ((headers
2400           ,(if number
2401                `(gnus-data-header (assq ,number gnus-newsgroup-data))
2402              '(gnus-data-header (assq (gnus-summary-article-number)
2403                                       gnus-newsgroup-data)))))
2404      (and headers
2405           (vectorp headers)
2406           (mail-header-subject headers))))
2407
2408 (defmacro gnus-summary-article-score (&optional number)
2409   "Return current article score."
2410   `(or (cdr (assq ,(or number '(gnus-summary-article-number))
2411                   gnus-newsgroup-scored))
2412        gnus-summary-default-score 0))
2413
2414 (defun gnus-summary-article-children (&optional number)
2415   "Return a list of article numbers that are children of article NUMBER."
2416   (let* ((data (gnus-data-find-list (or number (gnus-summary-article-number))))
2417          (level (gnus-data-level (car data)))
2418          l children)
2419     (while (and (setq data (cdr data))
2420                 (> (setq l (gnus-data-level (car data))) level))
2421       (and (= (1+ level) l)
2422            (push (gnus-data-number (car data))
2423                  children)))
2424     (nreverse children)))
2425
2426 (defun gnus-summary-article-parent (&optional number)
2427   "Return the article number of the parent of article NUMBER."
2428   (let* ((data (gnus-data-find-list (or number (gnus-summary-article-number))
2429                                     (gnus-data-list t)))
2430          (level (gnus-data-level (car data))))
2431     (if (zerop level)
2432         ()                              ; This is a root.
2433       ;; We search until we find an article with a level less than
2434       ;; this one.  That function has to be the parent.
2435       (while (and (setq data (cdr data))
2436                   (not (< (gnus-data-level (car data)) level))))
2437       (and data (gnus-data-number (car data))))))
2438
2439 (defun gnus-unread-mark-p (mark)
2440   "Say whether MARK is the unread mark."
2441   (= mark gnus-unread-mark))
2442
2443 (defun gnus-read-mark-p (mark)
2444   "Say whether MARK is one of the marks that mark as read.
2445 This is all marks except unread, ticked, dormant, and expirable."
2446   (not (or (= mark gnus-unread-mark)
2447            (= mark gnus-ticked-mark)
2448            (= mark gnus-dormant-mark)
2449            (= mark gnus-expirable-mark))))
2450
2451 (defmacro gnus-article-mark (number)
2452   "Return the MARK of article NUMBER.
2453 This macro should only be used when computing the mark the \"first\"
2454 time; i.e., when generating the summary lines.  After that,
2455 `gnus-summary-article-mark' should be used to examine the
2456 marks of articles."
2457   `(cond
2458     ((memq ,number gnus-newsgroup-unsendable) gnus-unsendable-mark)
2459     ((memq ,number gnus-newsgroup-undownloaded) gnus-undownloaded-mark)
2460     ((memq ,number gnus-newsgroup-downloadable) gnus-downloadable-mark)
2461     ((memq ,number gnus-newsgroup-unreads) gnus-unread-mark)
2462     ((memq ,number gnus-newsgroup-marked) gnus-ticked-mark)
2463     ((memq ,number gnus-newsgroup-dormant) gnus-dormant-mark)
2464     ((memq ,number gnus-newsgroup-expirable) gnus-expirable-mark)
2465     (t (or (cdr (assq ,number gnus-newsgroup-reads))
2466            gnus-ancient-mark))))
2467
2468 ;; Saving hidden threads.
2469
2470 (put 'gnus-save-hidden-threads 'lisp-indent-function 0)
2471 (put 'gnus-save-hidden-threads 'edebug-form-spec '(body))
2472
2473 (defmacro gnus-save-hidden-threads (&rest forms)
2474   "Save hidden threads, eval FORMS, and restore the hidden threads."
2475   (let ((config (make-symbol "config")))
2476     `(let ((,config (gnus-hidden-threads-configuration)))
2477        (unwind-protect
2478            (save-excursion
2479              ,@forms)
2480          (gnus-restore-hidden-threads-configuration ,config)))))
2481
2482 (defun gnus-data-compute-positions ()
2483   "Compute the positions of all articles."
2484   (setq gnus-newsgroup-data-reverse nil)
2485   (let ((data gnus-newsgroup-data))
2486     (save-excursion
2487       (gnus-save-hidden-threads
2488         (gnus-summary-show-all-threads)
2489         (goto-char (point-min))
2490         (while data
2491           (while (get-text-property (point) 'gnus-intangible)
2492             (forward-line 1))
2493           (gnus-data-set-pos (car data) (+ (point) 3))
2494           (setq data (cdr data))
2495           (forward-line 1))))))
2496
2497 (defun gnus-hidden-threads-configuration ()
2498   "Return the current hidden threads configuration."
2499   (save-excursion
2500     (let (config)
2501       (goto-char (point-min))
2502       (while (search-forward "\r" nil t)
2503         (push (1- (point)) config))
2504       config)))
2505
2506 (defun gnus-restore-hidden-threads-configuration (config)
2507   "Restore hidden threads configuration from CONFIG."
2508   (save-excursion
2509     (let (point buffer-read-only)
2510       (while (setq point (pop config))
2511         (when (and (< point (point-max))
2512                    (goto-char point)
2513                    (eq (char-after) ?\n))
2514           (subst-char-in-region point (1+ point) ?\n ?\r))))))
2515
2516 ;; Various summary mode internalish functions.
2517
2518 (defun gnus-mouse-pick-article (e)
2519   (interactive "e")
2520   (mouse-set-point e)
2521   (gnus-summary-next-page nil t))
2522
2523 (defun gnus-summary-set-display-table ()
2524   "Change the display table.
2525 Odd characters have a tendency to mess
2526 up nicely formatted displays - we make all possible glyphs
2527 display only a single character."
2528
2529   ;; We start from the standard display table, if any.
2530   (let ((table (or (copy-sequence standard-display-table)
2531                    (make-display-table)))
2532         (i 32))
2533     ;; Nix out all the control chars...
2534     (while (>= (setq i (1- i)) 0)
2535       (aset table i [??]))
2536     ;; ... but not newline and cr, of course.  (cr is necessary for the
2537     ;; selective display).
2538     (aset table ?\n nil)
2539     (aset table ?\r nil)
2540     ;; We keep TAB as well.
2541     (aset table ?\t nil)
2542     ;; We nix out any glyphs over 126 that are not set already.
2543     (let ((i 256))
2544       (while (>= (setq i (1- i)) 127)
2545         ;; Only modify if the entry is nil.
2546         (unless (aref table i)
2547           (aset table i [??]))))
2548     (setq buffer-display-table table)))
2549
2550 (defun gnus-summary-setup-buffer (group)
2551   "Initialize summary buffer."
2552   (let ((buffer (concat "*Summary " group "*")))
2553     (if (get-buffer buffer)
2554         (progn
2555           (set-buffer buffer)
2556           (setq gnus-summary-buffer (current-buffer))
2557           (not gnus-newsgroup-prepared))
2558       ;; Fix by Sudish Joseph <joseph@cis.ohio-state.edu>
2559       (setq gnus-summary-buffer (set-buffer (gnus-get-buffer-create buffer)))
2560       (gnus-summary-mode group)
2561       (when gnus-carpal
2562         (gnus-carpal-setup-buffer 'summary))
2563       (unless gnus-single-article-buffer
2564         (make-local-variable 'gnus-article-buffer)
2565         (make-local-variable 'gnus-article-current)
2566         (make-local-variable 'gnus-original-article-buffer))
2567       (setq gnus-newsgroup-name group)
2568       t)))
2569
2570 (defun gnus-set-global-variables ()
2571   "Set the global equivalents of the buffer-local variables.
2572 They are set to the latest values they had.  These reflect the summary
2573 buffer that was in action when the last article was fetched."
2574   (when (eq major-mode 'gnus-summary-mode)
2575     (setq gnus-summary-buffer (current-buffer))
2576     (let ((name gnus-newsgroup-name)
2577           (marked gnus-newsgroup-marked)
2578           (unread gnus-newsgroup-unreads)
2579           (headers gnus-current-headers)
2580           (data gnus-newsgroup-data)
2581           (summary gnus-summary-buffer)
2582           (article-buffer gnus-article-buffer)
2583           (original gnus-original-article-buffer)
2584           (gac gnus-article-current)
2585           (reffed gnus-reffed-article-number)
2586           (score-file gnus-current-score-file)
2587           (default-charset gnus-newsgroup-charset))
2588       (save-excursion
2589         (set-buffer gnus-group-buffer)
2590         (setq gnus-newsgroup-name name
2591               gnus-newsgroup-marked marked
2592               gnus-newsgroup-unreads unread
2593               gnus-current-headers headers
2594               gnus-newsgroup-data data
2595               gnus-article-current gac
2596               gnus-summary-buffer summary
2597               gnus-article-buffer article-buffer
2598               gnus-original-article-buffer original
2599               gnus-reffed-article-number reffed
2600               gnus-current-score-file score-file
2601               gnus-newsgroup-charset default-charset)
2602         ;; The article buffer also has local variables.
2603         (when (gnus-buffer-live-p gnus-article-buffer)
2604           (set-buffer gnus-article-buffer)
2605           (setq gnus-summary-buffer summary))))))
2606
2607 (defun gnus-summary-article-unread-p (article)
2608   "Say whether ARTICLE is unread or not."
2609   (memq article gnus-newsgroup-unreads))
2610
2611 (defun gnus-summary-first-article-p (&optional article)
2612   "Return whether ARTICLE is the first article in the buffer."
2613   (if (not (setq article (or article (gnus-summary-article-number))))
2614       nil
2615     (eq article (caar gnus-newsgroup-data))))
2616
2617 (defun gnus-summary-last-article-p (&optional article)
2618   "Return whether ARTICLE is the last article in the buffer."
2619   (if (not (setq article (or article (gnus-summary-article-number))))
2620       ;; All non-existent numbers are the last article.  :-)
2621       t
2622     (not (cdr (gnus-data-find-list article)))))
2623
2624 (defun gnus-make-thread-indent-array ()
2625   (let ((n 200))
2626     (unless (and gnus-thread-indent-array
2627                  (= gnus-thread-indent-level gnus-thread-indent-array-level))
2628       (setq gnus-thread-indent-array (make-vector 201 "")
2629             gnus-thread-indent-array-level gnus-thread-indent-level)
2630       (while (>= n 0)
2631         (aset gnus-thread-indent-array n
2632               (make-string (* n gnus-thread-indent-level) ? ))
2633         (setq n (1- n))))))
2634
2635 (defun gnus-update-summary-mark-positions ()
2636   "Compute where the summary marks are to go."
2637   (save-excursion
2638     (when (gnus-buffer-exists-p gnus-summary-buffer)
2639       (set-buffer gnus-summary-buffer))
2640     (let ((gnus-replied-mark 129)
2641           (gnus-score-below-mark 130)
2642           (gnus-score-over-mark 130)
2643           (gnus-download-mark 131)
2644           (spec gnus-summary-line-format-spec)
2645           gnus-visual pos)
2646       (save-excursion
2647         (gnus-set-work-buffer)
2648         (let ((gnus-summary-line-format-spec spec)
2649               (gnus-newsgroup-downloadable '((0 . t))))
2650           (gnus-summary-insert-line
2651            [0 "" "" "" "" "" 0 0 "" nil]  0 nil 128 t nil "" nil 1)
2652           (goto-char (point-min))
2653           (setq pos (list (cons 'unread (and (search-forward "\200" nil t)
2654                                              (- (point) 2)))))
2655           (goto-char (point-min))
2656           (push (cons 'replied (and (search-forward "\201" nil t)
2657                                     (- (point) 2)))
2658                 pos)
2659           (goto-char (point-min))
2660           (push (cons 'score (and (search-forward "\202" nil t) (- (point) 2)))
2661                 pos)
2662           (goto-char (point-min))
2663           (push (cons 'download
2664                       (and (search-forward "\203" nil t) (- (point) 2)))
2665                 pos)))
2666       (setq gnus-summary-mark-positions pos))))
2667
2668 (defun gnus-summary-insert-dummy-line (gnus-tmp-subject gnus-tmp-number)
2669   "Insert a dummy root in the summary buffer."
2670   (beginning-of-line)
2671   (gnus-add-text-properties
2672    (point) (progn (eval gnus-summary-dummy-line-format-spec) (point))
2673    (list 'gnus-number gnus-tmp-number 'gnus-intangible gnus-tmp-number)))
2674
2675 (defun gnus-summary-from-or-to-or-newsgroups (header)
2676   (let ((to (cdr (assq 'To (mail-header-extra header))))
2677         (newsgroups (cdr (assq 'Newsgroups (mail-header-extra header))))
2678         (mail-parse-charset gnus-newsgroup-charset)
2679         (mail-parse-ignored-charsets
2680          (save-excursion (set-buffer gnus-summary-buffer)
2681                          gnus-newsgroup-ignored-charsets)))
2682     (cond
2683      ((and to
2684            gnus-ignored-from-addresses
2685            (string-match gnus-ignored-from-addresses
2686                          (mail-header-from header)))
2687       (concat "-> "
2688               (or (car (funcall gnus-extract-address-components
2689                                 (funcall
2690                                  gnus-decode-encoded-word-function to)))
2691                   (funcall gnus-decode-encoded-word-function to))))
2692      ((and newsgroups
2693            gnus-ignored-from-addresses
2694            (string-match gnus-ignored-from-addresses
2695                          (mail-header-from header)))
2696       (concat "=> " newsgroups))
2697      (t
2698       (or (car (funcall gnus-extract-address-components
2699                         (mail-header-from header)))
2700           (mail-header-from header))))))
2701
2702 (defun gnus-summary-insert-line (gnus-tmp-header
2703                                  gnus-tmp-level gnus-tmp-current
2704                                  gnus-tmp-unread gnus-tmp-replied
2705                                  gnus-tmp-expirable gnus-tmp-subject-or-nil
2706                                  &optional gnus-tmp-dummy gnus-tmp-score
2707                                  gnus-tmp-process)
2708   (let* ((gnus-tmp-indentation (aref gnus-thread-indent-array gnus-tmp-level))
2709          (gnus-tmp-lines (mail-header-lines gnus-tmp-header))
2710          (gnus-tmp-score (or gnus-tmp-score gnus-summary-default-score 0))
2711          (gnus-tmp-score-char
2712           (if (or (null gnus-summary-default-score)
2713                   (<= (abs (- gnus-tmp-score gnus-summary-default-score))
2714                       gnus-summary-zcore-fuzz))
2715               ?  ;Whitespace
2716             (if (< gnus-tmp-score gnus-summary-default-score)
2717                 gnus-score-below-mark gnus-score-over-mark)))
2718          (gnus-tmp-replied
2719           (cond (gnus-tmp-process gnus-process-mark)
2720                 ((memq gnus-tmp-current gnus-newsgroup-cached)
2721                  gnus-cached-mark)
2722                 (gnus-tmp-replied gnus-replied-mark)
2723                 ((memq gnus-tmp-current gnus-newsgroup-saved)
2724                  gnus-saved-mark)
2725                 (t gnus-unread-mark)))
2726          (gnus-tmp-from (mail-header-from gnus-tmp-header))
2727          (gnus-tmp-name
2728           (cond
2729            ((string-match "<[^>]+> *$" gnus-tmp-from)
2730             (let ((beg (match-beginning 0)))
2731               (or (and (string-match "^\"[^\"]*\"" gnus-tmp-from)
2732                        (substring gnus-tmp-from (1+ (match-beginning 0))
2733                                   (1- (match-end 0))))
2734                   (substring gnus-tmp-from 0 beg))))
2735            ((string-match "(.+)" gnus-tmp-from)
2736             (substring gnus-tmp-from
2737                        (1+ (match-beginning 0)) (1- (match-end 0))))
2738            (t gnus-tmp-from)))
2739          (gnus-tmp-subject (mail-header-subject gnus-tmp-header))
2740          (gnus-tmp-number (mail-header-number gnus-tmp-header))
2741          (gnus-tmp-opening-bracket (if gnus-tmp-dummy ?\< ?\[))
2742          (gnus-tmp-closing-bracket (if gnus-tmp-dummy ?\> ?\]))
2743          (buffer-read-only nil))
2744     (when (string= gnus-tmp-name "")
2745       (setq gnus-tmp-name gnus-tmp-from))
2746     (unless (numberp gnus-tmp-lines)
2747       (setq gnus-tmp-lines 0))
2748     (gnus-put-text-property
2749      (point)
2750      (progn (eval gnus-summary-line-format-spec) (point))
2751      'gnus-number gnus-tmp-number)
2752     (when (gnus-visual-p 'summary-highlight 'highlight)
2753       (forward-line -1)
2754       (gnus-run-hooks 'gnus-summary-update-hook)
2755       (forward-line 1))))
2756
2757 (defun gnus-summary-update-line (&optional dont-update)
2758   "Update summary line after change."
2759   (when (and gnus-summary-default-score
2760              (not gnus-summary-inhibit-highlight))
2761     (let* ((gnus-summary-inhibit-highlight t) ; Prevent recursion.
2762            (article (gnus-summary-article-number))
2763            (score (gnus-summary-article-score article)))
2764       (unless dont-update
2765         (if (and gnus-summary-mark-below
2766                  (< (gnus-summary-article-score)
2767                     gnus-summary-mark-below))
2768             ;; This article has a low score, so we mark it as read.
2769             (when (memq article gnus-newsgroup-unreads)
2770               (gnus-summary-mark-article-as-read gnus-low-score-mark))
2771           (when (eq (gnus-summary-article-mark) gnus-low-score-mark)
2772             ;; This article was previously marked as read on account
2773             ;; of a low score, but now it has risen, so we mark it as
2774             ;; unread.
2775             (gnus-summary-mark-article-as-unread gnus-unread-mark)))
2776         (gnus-summary-update-mark
2777          (if (or (null gnus-summary-default-score)
2778                  (<= (abs (- score gnus-summary-default-score))
2779                      gnus-summary-zcore-fuzz))
2780              ?  ;Whitespace
2781            (if (< score gnus-summary-default-score)
2782                gnus-score-below-mark gnus-score-over-mark))
2783          'score))
2784       ;; Do visual highlighting.
2785       (when (gnus-visual-p 'summary-highlight 'highlight)
2786         (gnus-run-hooks 'gnus-summary-update-hook)))))
2787
2788 (defvar gnus-tmp-new-adopts nil)
2789
2790 (defun gnus-summary-number-of-articles-in-thread (thread &optional level char)
2791   "Return the number of articles in THREAD.
2792 This may be 0 in some cases -- if none of the articles in
2793 the thread are to be displayed."
2794   (let* ((number
2795           ;; Fix by Luc Van Eycken <Luc.VanEycken@esat.kuleuven.ac.be>.
2796           (cond
2797            ((not (listp thread))
2798             1)
2799            ((and (consp thread) (cdr thread))
2800             (apply
2801              '+ 1 (mapcar
2802                    'gnus-summary-number-of-articles-in-thread (cdr thread))))
2803            ((null thread)
2804             1)
2805            ((memq (mail-header-number (car thread)) gnus-newsgroup-limit)
2806             1)
2807            (t 0))))
2808     (when (and level (zerop level) gnus-tmp-new-adopts)
2809       (incf number
2810             (apply '+ (mapcar
2811                        'gnus-summary-number-of-articles-in-thread
2812                        gnus-tmp-new-adopts))))
2813     (if char
2814         (if (> number 1) gnus-not-empty-thread-mark
2815           gnus-empty-thread-mark)
2816       number)))
2817
2818 (defun gnus-summary-set-local-parameters (group)
2819   "Go through the local params of GROUP and set all variable specs in that list."
2820   (let ((params (gnus-group-find-parameter group))
2821         elem)
2822     (while params
2823       (setq elem (car params)
2824             params (cdr params))
2825       (and (consp elem)                 ; Has to be a cons.
2826            (consp (cdr elem))           ; The cdr has to be a list.
2827            (symbolp (car elem))         ; Has to be a symbol in there.
2828            (not (memq (car elem) '(quit-config))) ; Ignore quit-config.
2829            (ignore-errors               ; So we set it.
2830              (make-local-variable (car elem))
2831              (set (car elem) (eval (nth 1 elem))))))))
2832
2833 (defun gnus-summary-read-group (group &optional show-all no-article
2834                                       kill-buffer no-display backward
2835                                       select-articles)
2836   "Start reading news in newsgroup GROUP.
2837 If SHOW-ALL is non-nil, already read articles are also listed.
2838 If NO-ARTICLE is non-nil, no article is selected initially.
2839 If NO-DISPLAY, don't generate a summary buffer."
2840   (let (result)
2841     (while (and group
2842                 (null (setq result
2843                             (let ((gnus-auto-select-next nil))
2844                               (or (gnus-summary-read-group-1
2845                                    group show-all no-article
2846                                    kill-buffer no-display
2847                                    select-articles)
2848                                   (setq show-all nil
2849                                         select-articles nil)))))
2850                 (eq gnus-auto-select-next 'quietly))
2851       (set-buffer gnus-group-buffer)
2852       ;; The entry function called above goes to the next
2853       ;; group automatically, so we go two groups back
2854       ;; if we are searching for the previous group.
2855       (when backward
2856         (gnus-group-prev-unread-group 2))
2857       (if (not (equal group (gnus-group-group-name)))
2858           (setq group (gnus-group-group-name))
2859         (setq group nil)))
2860     result))
2861
2862 (defun gnus-summary-read-group-1 (group show-all no-article
2863                                         kill-buffer no-display
2864                                         &optional select-articles)
2865   ;; Killed foreign groups can't be entered.
2866   (when (and (not (gnus-group-native-p group))
2867              (not (gnus-gethash group gnus-newsrc-hashtb)))
2868     (error "Dead non-native groups can't be entered"))
2869   (gnus-message 5 "Retrieving newsgroup: %s..." group)
2870   (let* ((new-group (gnus-summary-setup-buffer group))
2871          (quit-config (gnus-group-quit-config group))
2872          (did-select (and new-group (gnus-select-newsgroup
2873                                      group show-all select-articles))))
2874     (cond
2875      ;; This summary buffer exists already, so we just select it.
2876      ((not new-group)
2877       (gnus-set-global-variables)
2878       (when kill-buffer
2879         (gnus-kill-or-deaden-summary kill-buffer))
2880       (gnus-configure-windows 'summary 'force)
2881       (gnus-set-mode-line 'summary)
2882       (gnus-summary-position-point)
2883       (message "")
2884       t)
2885      ;; We couldn't select this group.
2886      ((null did-select)
2887       (when (and (eq major-mode 'gnus-summary-mode)
2888                  (not (equal (current-buffer) kill-buffer)))
2889         (kill-buffer (current-buffer))
2890         (if (not quit-config)
2891             (progn
2892               ;; Update the info -- marks might need to be removed,
2893               ;; for instance.
2894               (gnus-summary-update-info)
2895               (set-buffer gnus-group-buffer)
2896               (gnus-group-jump-to-group group)
2897               (gnus-group-next-unread-group 1))
2898           (gnus-handle-ephemeral-exit quit-config)))
2899       (gnus-message 3 "Can't select group")
2900       nil)
2901      ;; The user did a `C-g' while prompting for number of articles,
2902      ;; so we exit this group.
2903      ((eq did-select 'quit)
2904       (and (eq major-mode 'gnus-summary-mode)
2905            (not (equal (current-buffer) kill-buffer))
2906            (kill-buffer (current-buffer)))
2907       (when kill-buffer
2908         (gnus-kill-or-deaden-summary kill-buffer))
2909       (if (not quit-config)
2910           (progn
2911             (set-buffer gnus-group-buffer)
2912             (gnus-group-jump-to-group group)
2913             (gnus-group-next-unread-group 1)
2914             (gnus-configure-windows 'group 'force))
2915         (gnus-handle-ephemeral-exit quit-config))
2916       ;; Finally signal the quit.
2917       (signal 'quit nil))
2918      ;; The group was successfully selected.
2919      (t
2920       (gnus-set-global-variables)
2921       ;; Save the active value in effect when the group was entered.
2922       (setq gnus-newsgroup-active
2923             (gnus-copy-sequence
2924              (gnus-active gnus-newsgroup-name)))
2925       ;; You can change the summary buffer in some way with this hook.
2926       (gnus-run-hooks 'gnus-select-group-hook)
2927       ;; Set any local variables in the group parameters.
2928       (gnus-summary-set-local-parameters gnus-newsgroup-name)
2929       (gnus-update-format-specifications
2930        nil 'summary 'summary-mode 'summary-dummy)
2931       (gnus-update-summary-mark-positions)
2932       ;; Do score processing.
2933       (when gnus-use-scoring
2934         (gnus-possibly-score-headers))
2935       ;; Check whether to fill in the gaps in the threads.
2936       (when gnus-build-sparse-threads
2937         (gnus-build-sparse-threads))
2938       ;; Find the initial limit.
2939       (if gnus-show-threads
2940           (if show-all
2941               (let ((gnus-newsgroup-dormant nil))
2942                 (gnus-summary-initial-limit show-all))
2943             (gnus-summary-initial-limit show-all))
2944         ;; When untreaded, all articles are always shown.
2945         (setq gnus-newsgroup-limit
2946               (mapcar
2947                (lambda (header) (mail-header-number header))
2948                gnus-newsgroup-headers)))
2949       ;; Generate the summary buffer.
2950       (unless no-display
2951         (gnus-summary-prepare))
2952       (when gnus-use-trees
2953         (gnus-tree-open group)
2954         (setq gnus-summary-highlight-line-function
2955               'gnus-tree-highlight-article))
2956       ;; If the summary buffer is empty, but there are some low-scored
2957       ;; articles or some excluded dormants, we include these in the
2958       ;; buffer.
2959       (when (and (zerop (buffer-size))
2960                  (not no-display))
2961         (cond (gnus-newsgroup-dormant
2962                (gnus-summary-limit-include-dormant))
2963               ((and gnus-newsgroup-scored show-all)
2964                (gnus-summary-limit-include-expunged t))))
2965       ;; Function `gnus-apply-kill-file' must be called in this hook.
2966       (gnus-run-hooks 'gnus-apply-kill-hook)
2967       (if (and (zerop (buffer-size))
2968                (not no-display))
2969           (progn
2970             ;; This newsgroup is empty.
2971             (gnus-summary-catchup-and-exit nil t)
2972             (gnus-message 6 "No unread news")
2973             (when kill-buffer
2974               (gnus-kill-or-deaden-summary kill-buffer))
2975             ;; Return nil from this function.
2976             nil)
2977         ;; Hide conversation thread subtrees.  We cannot do this in
2978         ;; gnus-summary-prepare-hook since kill processing may not
2979         ;; work with hidden articles.
2980         (and gnus-show-threads
2981              gnus-thread-hide-subtree
2982              (gnus-summary-hide-all-threads))
2983         (when kill-buffer
2984           (gnus-kill-or-deaden-summary kill-buffer))
2985         ;; Show first unread article if requested.
2986         (if (and (not no-article)
2987                  (not no-display)
2988                  gnus-newsgroup-unreads
2989                  gnus-auto-select-first)
2990             (progn
2991               (gnus-configure-windows 'summary)
2992               (cond
2993                ((eq gnus-auto-select-first 'best)
2994                 (gnus-summary-best-unread-article))
2995                ((eq gnus-auto-select-first t)
2996                 (gnus-summary-first-unread-article))
2997                ((gnus-functionp gnus-auto-select-first)
2998                 (funcall gnus-auto-select-first))))
2999           ;; Don't select any articles, just move point to the first
3000           ;; article in the group.
3001           (goto-char (point-min))
3002           (gnus-summary-position-point)
3003           (gnus-configure-windows 'summary 'force)
3004           (gnus-set-mode-line 'summary))
3005         (when (get-buffer-window gnus-group-buffer t)
3006           ;; Gotta use windows, because recenter does weird stuff if
3007           ;; the current buffer ain't the displayed window.
3008           (let ((owin (selected-window)))
3009             (select-window (get-buffer-window gnus-group-buffer t))
3010             (when (gnus-group-goto-group group)
3011               (recenter))
3012             (select-window owin)))
3013         ;; Mark this buffer as "prepared".
3014         (setq gnus-newsgroup-prepared t)
3015         (gnus-run-hooks 'gnus-summary-prepared-hook)
3016         t)))))
3017
3018 (defun gnus-summary-prepare ()
3019   "Generate the summary buffer."
3020   (interactive)
3021   (let ((buffer-read-only nil))
3022     (erase-buffer)
3023     (setq gnus-newsgroup-data nil
3024           gnus-newsgroup-data-reverse nil)
3025     (gnus-run-hooks 'gnus-summary-generate-hook)
3026     ;; Generate the buffer, either with threads or without.
3027     (when gnus-newsgroup-headers
3028       (gnus-summary-prepare-threads
3029        (if gnus-show-threads
3030            (gnus-sort-gathered-threads
3031             (funcall gnus-summary-thread-gathering-function
3032                      (gnus-sort-threads
3033                       (gnus-cut-threads (gnus-make-threads)))))
3034          ;; Unthreaded display.
3035          (gnus-sort-articles gnus-newsgroup-headers))))
3036     (setq gnus-newsgroup-data (nreverse gnus-newsgroup-data))
3037     ;; Call hooks for modifying summary buffer.
3038     (goto-char (point-min))
3039     (gnus-run-hooks 'gnus-summary-prepare-hook)))
3040
3041 (defsubst gnus-general-simplify-subject (subject)
3042   "Simply subject by the same rules as gnus-gather-threads-by-subject."
3043   (setq subject
3044         (cond
3045          ;; Truncate the subject.
3046          (gnus-simplify-subject-functions
3047           (gnus-map-function gnus-simplify-subject-functions subject))
3048          ((numberp gnus-summary-gather-subject-limit)
3049           (setq subject (gnus-simplify-subject-re subject))
3050           (if (> (length subject) gnus-summary-gather-subject-limit)
3051               (substring subject 0 gnus-summary-gather-subject-limit)
3052             subject))
3053          ;; Fuzzily simplify it.
3054          ((eq 'fuzzy gnus-summary-gather-subject-limit)
3055           (gnus-simplify-subject-fuzzy subject))
3056          ;; Just remove the leading "Re:".
3057          (t
3058           (gnus-simplify-subject-re subject))))
3059
3060   (if (and gnus-summary-gather-exclude-subject
3061            (string-match gnus-summary-gather-exclude-subject subject))
3062       nil                               ; This article shouldn't be gathered
3063     subject))
3064
3065 (defun gnus-summary-simplify-subject-query ()
3066   "Query where the respool algorithm would put this article."
3067   (interactive)
3068   (gnus-summary-select-article)
3069   (message (gnus-general-simplify-subject (gnus-summary-article-subject))))
3070
3071 (defun gnus-gather-threads-by-subject (threads)
3072   "Gather threads by looking at Subject headers."
3073   (if (not gnus-summary-make-false-root)
3074       threads
3075     (let ((hashtb (gnus-make-hashtable 1024))
3076           (prev threads)
3077           (result threads)
3078           subject hthread whole-subject)
3079       (while threads
3080         (setq subject (gnus-general-simplify-subject
3081                        (setq whole-subject (mail-header-subject
3082                                             (caar threads)))))
3083         (when subject
3084           (if (setq hthread (gnus-gethash subject hashtb))
3085               (progn
3086                 ;; We enter a dummy root into the thread, if we
3087                 ;; haven't done that already.
3088                 (unless (stringp (caar hthread))
3089                   (setcar hthread (list whole-subject (car hthread))))
3090                 ;; We add this new gathered thread to this gathered
3091                 ;; thread.
3092                 (setcdr (car hthread)
3093                         (nconc (cdar hthread) (list (car threads))))
3094                 ;; Remove it from the list of threads.
3095                 (setcdr prev (cdr threads))
3096                 (setq threads prev))
3097             ;; Enter this thread into the hash table.
3098             (gnus-sethash subject threads hashtb)))
3099         (setq prev threads)
3100         (setq threads (cdr threads)))
3101       result)))
3102
3103 (defun gnus-gather-threads-by-references (threads)
3104   "Gather threads by looking at References headers."
3105   (let ((idhashtb (gnus-make-hashtable 1024))
3106         (thhashtb (gnus-make-hashtable 1024))
3107         (prev threads)
3108         (result threads)
3109         ids references id gthread gid entered ref)
3110     (while threads
3111       (when (setq references (mail-header-references (caar threads)))
3112         (setq id (mail-header-id (caar threads))
3113               ids (gnus-split-references references)
3114               entered nil)
3115         (while (setq ref (pop ids))
3116           (setq ids (delete ref ids))
3117           (if (not (setq gid (gnus-gethash ref idhashtb)))
3118               (progn
3119                 (gnus-sethash ref id idhashtb)
3120                 (gnus-sethash id threads thhashtb))
3121             (setq gthread (gnus-gethash gid thhashtb))
3122             (unless entered
3123               ;; We enter a dummy root into the thread, if we
3124               ;; haven't done that already.
3125               (unless (stringp (caar gthread))
3126                 (setcar gthread (list (mail-header-subject (caar gthread))
3127                                       (car gthread))))
3128               ;; We add this new gathered thread to this gathered
3129               ;; thread.
3130               (setcdr (car gthread)
3131                       (nconc (cdar gthread) (list (car threads)))))
3132             ;; Add it into the thread hash table.
3133             (gnus-sethash id gthread thhashtb)
3134             (setq entered t)
3135             ;; Remove it from the list of threads.
3136             (setcdr prev (cdr threads))
3137             (setq threads prev))))
3138       (setq prev threads)
3139       (setq threads (cdr threads)))
3140     result))
3141
3142 (defun gnus-sort-gathered-threads (threads)
3143   "Sort subtreads inside each gathered thread by `gnus-sort-gathered-threads-function'."
3144   (let ((result threads))
3145     (while threads
3146       (when (stringp (caar threads))
3147         (setcdr (car threads)
3148                 (sort (cdar threads) gnus-sort-gathered-threads-function)))
3149       (setq threads (cdr threads)))
3150     result))
3151
3152 (defun gnus-thread-loop-p (root thread)
3153   "Say whether ROOT is in THREAD."
3154   (let ((stack (list thread))
3155         (infloop 0)
3156         th)
3157     (while (setq thread (pop stack))
3158       (setq th (cdr thread))
3159       (while (and th
3160                   (not (eq (caar th) root)))
3161         (pop th))
3162       (if th
3163           ;; We have found a loop.
3164           (let (ref-dep)
3165             (setcdr thread (delq (car th) (cdr thread)))
3166             (if (boundp (setq ref-dep (intern "none"
3167                                               gnus-newsgroup-dependencies)))
3168                 (setcdr (symbol-value ref-dep)
3169                         (nconc (cdr (symbol-value ref-dep))
3170                                (list (car th))))
3171               (set ref-dep (list nil (car th))))
3172             (setq infloop 1
3173                   stack nil))
3174         ;; Push all the subthreads onto the stack.
3175         (push (cdr thread) stack)))
3176     infloop))
3177
3178 (defun gnus-make-threads ()
3179   "Go through the dependency hashtb and find the roots.  Return all threads."
3180   (let (threads)
3181     (while (catch 'infloop
3182              (mapatoms
3183               (lambda (refs)
3184                 ;; Deal with self-referencing References loops.
3185                 (when (and (car (symbol-value refs))
3186                            (not (zerop
3187                                  (apply
3188                                   '+
3189                                   (mapcar
3190                                    (lambda (thread)
3191                                      (gnus-thread-loop-p
3192                                       (car (symbol-value refs)) thread))
3193                                    (cdr (symbol-value refs)))))))
3194                   (setq threads nil)
3195                   (throw 'infloop t))
3196                 (unless (car (symbol-value refs))
3197                   ;; These threads do not refer back to any other articles,
3198                   ;; so they're roots.
3199                   (setq threads (append (cdr (symbol-value refs)) threads))))
3200               gnus-newsgroup-dependencies)))
3201     threads))
3202
3203 ;; Build the thread tree.
3204 (defsubst gnus-dependencies-add-header (header dependencies force-new)
3205   "Enter HEADER into the DEPENDENCIES table if it is not already there.
3206
3207 If FORCE-NEW is not nil, enter HEADER into the DEPENDENCIES table even
3208 if it was already present.
3209
3210 If `gnus-summary-ignore-duplicates' is nil then duplicate Message-IDs
3211 will not be entered in the DEPENDENCIES table.  Otherwise duplicate
3212 Message-IDs will be renamed be renamed to a unique Message-ID before
3213 being entered.
3214
3215 Returns HEADER if it was entered in the DEPENDENCIES.  Returns nil otherwise."
3216   (let* ((id (mail-header-id header))
3217          (id-dep (and id (intern id dependencies)))
3218          ref ref-dep ref-header)
3219     ;; Enter this `header' in the `dependencies' table.
3220     (cond
3221      ((not id-dep)
3222       (setq header nil))
3223      ;; The first two cases do the normal part: enter a new `header'
3224      ;; in the `dependencies' table.
3225      ((not (boundp id-dep))
3226       (set id-dep (list header)))
3227      ((null (car (symbol-value id-dep)))
3228       (setcar (symbol-value id-dep) header))
3229
3230      ;; From here the `header' was already present in the
3231      ;; `dependencies' table.
3232      (force-new
3233       ;; Overrides an existing entry;
3234       ;; just set the header part of the entry.
3235       (setcar (symbol-value id-dep) header))
3236
3237      ;; Renames the existing `header' to a unique Message-ID.
3238      ((not gnus-summary-ignore-duplicates)
3239       ;; An article with this Message-ID has already been seen.
3240       ;; We rename the Message-ID.
3241       (set (setq id-dep (intern (setq id (nnmail-message-id)) dependencies))
3242            (list header))
3243       (mail-header-set-id header id))
3244
3245      ;; The last case ignores an existing entry, except it adds any
3246      ;; additional Xrefs (in case the two articles came from different
3247      ;; servers.
3248      ;; Also sets `header' to `nil' meaning that the `dependencies'
3249      ;; table was *not* modified.
3250      (t
3251       (mail-header-set-xref
3252        (car (symbol-value id-dep))
3253        (concat (or (mail-header-xref (car (symbol-value id-dep)))
3254                    "")
3255                (or (mail-header-xref header) "")))
3256       (setq header nil)))
3257
3258     (when header
3259       ;; First check if that we are not creating a References loop.
3260       (setq ref (gnus-parent-id (mail-header-references header)))
3261       (while (and ref
3262                   (setq ref-dep (intern-soft ref dependencies))
3263                   (boundp ref-dep)
3264                   (setq ref-header (car (symbol-value ref-dep))))
3265         (if (string= id ref)
3266             ;; Yuk!  This is a reference loop.  Make the article be a
3267             ;; root article.
3268             (progn
3269               (mail-header-set-references (car (symbol-value id-dep)) "none")
3270               (setq ref nil))
3271           (setq ref (gnus-parent-id (mail-header-references ref-header)))))
3272       (setq ref (gnus-parent-id (mail-header-references header)))
3273       (setq ref-dep (intern (or ref "none") dependencies))
3274       (if (boundp ref-dep)
3275           (setcdr (symbol-value ref-dep)
3276                   (nconc (cdr (symbol-value ref-dep))
3277                          (list (symbol-value id-dep))))
3278         (set ref-dep (list nil (symbol-value id-dep)))))
3279     header))
3280
3281 (defun gnus-build-sparse-threads ()
3282   (let ((headers gnus-newsgroup-headers)
3283         (mail-parse-charset gnus-newsgroup-charset)
3284         (gnus-summary-ignore-duplicates t)
3285         header references generation relations
3286         subject child end new-child date)
3287     ;; First we create an alist of generations/relations, where
3288     ;; generations is how much we trust the relation, and the relation
3289     ;; is parent/child.
3290     (gnus-message 7 "Making sparse threads...")
3291     (save-excursion
3292       (nnheader-set-temp-buffer " *gnus sparse threads*")
3293       (while (setq header (pop headers))
3294         (when (and (setq references (mail-header-references header))
3295                    (not (string= references "")))
3296           (insert references)
3297           (setq child (mail-header-id header)
3298                 subject (mail-header-subject header)
3299                 date (mail-header-date header)
3300                 generation 0)
3301           (while (search-backward ">" nil t)
3302             (setq end (1+ (point)))
3303             (when (search-backward "<" nil t)
3304               (setq new-child (buffer-substring (point) end))
3305               (push (list (incf generation)
3306                           child (setq child new-child)
3307                           subject date)
3308                     relations)))
3309           (when child
3310             (push (list (1+ generation) child nil subject) relations))
3311           (erase-buffer)))
3312       (kill-buffer (current-buffer)))
3313     ;; Sort over trustworthiness.
3314     (mapcar
3315      (lambda (relation)
3316        (when (gnus-dependencies-add-header
3317               (make-full-mail-header
3318                gnus-reffed-article-number
3319                (nth 3 relation) "" (or (nth 4 relation) "")
3320                (nth 1 relation)
3321                (or (nth 2 relation) "") 0 0 "")
3322               gnus-newsgroup-dependencies nil)
3323          (push gnus-reffed-article-number gnus-newsgroup-limit)
3324          (push gnus-reffed-article-number gnus-newsgroup-sparse)
3325          (push (cons gnus-reffed-article-number gnus-sparse-mark)
3326                gnus-newsgroup-reads)
3327          (decf gnus-reffed-article-number)))
3328      (sort relations 'car-less-than-car))
3329     (gnus-message 7 "Making sparse threads...done")))
3330
3331 (defun gnus-build-old-threads ()
3332   ;; Look at all the articles that refer back to old articles, and
3333   ;; fetch the headers for the articles that aren't there.  This will
3334   ;; build complete threads - if the roots haven't been expired by the
3335   ;; server, that is.
3336   (let ((mail-parse-charset gnus-newsgroup-charset)
3337         id heads)
3338     (mapatoms
3339      (lambda (refs)
3340        (when (not (car (symbol-value refs)))
3341          (setq heads (cdr (symbol-value refs)))
3342          (while heads
3343            (if (memq (mail-header-number (caar heads))
3344                      gnus-newsgroup-dormant)
3345                (setq heads (cdr heads))
3346              (setq id (symbol-name refs))
3347              (while (and (setq id (gnus-build-get-header id))
3348                          (not (car (gnus-id-to-thread id)))))
3349              (setq heads nil)))))
3350      gnus-newsgroup-dependencies)))
3351
3352 ;; This function has to be called with point after the article number
3353 ;; on the beginning of the line.
3354 (defsubst gnus-nov-parse-line (number dependencies &optional force-new)
3355   (let ((eol (gnus-point-at-eol))
3356         (buffer (current-buffer))
3357         header)
3358
3359     ;; overview: [num subject from date id refs chars lines misc]
3360     (unwind-protect
3361         (progn
3362           (narrow-to-region (point) eol)
3363           (unless (eobp)
3364             (forward-char))
3365
3366           (setq header
3367                 (make-full-mail-header
3368                  number                 ; number
3369                  (funcall gnus-decode-encoded-word-function
3370                           (nnheader-nov-field)) ; subject
3371                  (funcall gnus-decode-encoded-word-function
3372                           (nnheader-nov-field)) ; from
3373                  (nnheader-nov-field)   ; date
3374                  (nnheader-nov-read-message-id) ; id
3375                  (nnheader-nov-field)   ; refs
3376                  (nnheader-nov-read-integer) ; chars
3377                  (nnheader-nov-read-integer) ; lines
3378                  (unless (eobp)
3379                    (if (looking-at "Xref: ")
3380                        (goto-char (match-end 0)))
3381                    (nnheader-nov-field)) ; Xref
3382                  (nnheader-nov-parse-extra)))) ; extra
3383
3384       (widen))
3385
3386     (when gnus-alter-header-function
3387       (funcall gnus-alter-header-function header))
3388     (gnus-dependencies-add-header header dependencies force-new)))
3389
3390 (defun gnus-build-get-header (id)
3391   "Look through the buffer of NOV lines and find the header to ID.
3392 Enter this line into the dependencies hash table, and return
3393 the id of the parent article (if any)."
3394   (let ((deps gnus-newsgroup-dependencies)
3395         found header)
3396     (prog1
3397         (save-excursion
3398           (set-buffer nntp-server-buffer)
3399           (let ((case-fold-search nil))
3400             (goto-char (point-min))
3401             (while (and (not found)
3402                         (search-forward id nil t))
3403               (beginning-of-line)
3404               (setq found (looking-at
3405                            (format "^[^\t]*\t[^\t]*\t[^\t]*\t[^\t]*\t%s"
3406                                    (regexp-quote id))))
3407               (or found (beginning-of-line 2)))
3408             (when found
3409               (beginning-of-line)
3410               (and
3411                (setq header (gnus-nov-parse-line
3412                              (read (current-buffer)) deps))
3413                (gnus-parent-id (mail-header-references header))))))
3414       (when header
3415         (let ((number (mail-header-number header)))
3416           (push number gnus-newsgroup-limit)
3417           (push header gnus-newsgroup-headers)
3418           (if (memq number gnus-newsgroup-unselected)
3419               (progn
3420                 (push number gnus-newsgroup-unreads)
3421                 (setq gnus-newsgroup-unselected
3422                       (delq number gnus-newsgroup-unselected)))
3423             (push number gnus-newsgroup-ancient)))))))
3424
3425 (defun gnus-build-all-threads ()
3426   "Read all the headers."
3427   (let ((gnus-summary-ignore-duplicates t)
3428         (mail-parse-charset gnus-newsgroup-charset)
3429         (dependencies gnus-newsgroup-dependencies)
3430         header article)
3431     (save-excursion
3432       (set-buffer nntp-server-buffer)
3433       (let ((case-fold-search nil))
3434         (goto-char (point-min))
3435         (while (not (eobp))
3436           (ignore-errors
3437             (setq article (read (current-buffer))
3438                   header (gnus-nov-parse-line article dependencies)))
3439           (when header
3440             (save-excursion
3441               (set-buffer gnus-summary-buffer)
3442               (push header gnus-newsgroup-headers)
3443               (if (memq (setq article (mail-header-number header))
3444                         gnus-newsgroup-unselected)
3445                   (progn
3446                     (push article gnus-newsgroup-unreads)
3447                     (setq gnus-newsgroup-unselected
3448                           (delq article gnus-newsgroup-unselected)))
3449                 (push article gnus-newsgroup-ancient)))
3450             (forward-line 1)))))))
3451
3452 (defun gnus-summary-update-article-line (article header)
3453   "Update the line for ARTICLE using HEADERS."
3454   (let* ((id (mail-header-id header))
3455          (thread (gnus-id-to-thread id)))
3456     (unless thread
3457       (error "Article in no thread"))
3458     ;; Update the thread.
3459     (setcar thread header)
3460     (gnus-summary-goto-subject article)
3461     (let* ((datal (gnus-data-find-list article))
3462            (data (car datal))
3463            (length (when (cdr datal)
3464                      (- (gnus-data-pos data)
3465                         (gnus-data-pos (cadr datal)))))
3466            (buffer-read-only nil)
3467            (level (gnus-summary-thread-level)))
3468       (gnus-delete-line)
3469       (gnus-summary-insert-line
3470        header level nil (gnus-article-mark article)
3471        (memq article gnus-newsgroup-replied)
3472        (memq article gnus-newsgroup-expirable)
3473        ;; Only insert the Subject string when it's different
3474        ;; from the previous Subject string.
3475        (if (and
3476             gnus-show-threads
3477             (gnus-subject-equal
3478              (condition-case ()
3479                  (mail-header-subject
3480                   (gnus-data-header
3481                    (cadr
3482                     (gnus-data-find-list
3483                      article
3484                      (gnus-data-list t)))))
3485                ;; Error on the side of excessive subjects.
3486                (error ""))
3487              (mail-header-subject header)))
3488            ""
3489          (mail-header-subject header))
3490        nil (cdr (assq article gnus-newsgroup-scored))
3491        (memq article gnus-newsgroup-processable))
3492       (when length
3493         (gnus-data-update-list
3494          (cdr datal) (- length (- (gnus-data-pos data) (point))))))))
3495
3496 (defun gnus-summary-update-article (article &optional iheader)
3497   "Update ARTICLE in the summary buffer."
3498   (set-buffer gnus-summary-buffer)
3499   (let* ((header (gnus-summary-article-header article))
3500          (id (mail-header-id header))
3501          (data (gnus-data-find article))
3502          (thread (gnus-id-to-thread id))
3503          (references (mail-header-references header))
3504          (parent
3505           (gnus-id-to-thread
3506            (or (gnus-parent-id
3507                 (when (and references
3508                            (not (equal "" references)))
3509                   references))
3510                "none")))
3511          (buffer-read-only nil)
3512          (old (car thread)))
3513     (when thread
3514       (unless iheader
3515         (setcar thread nil)
3516         (when parent
3517           (delq thread parent)))
3518       (if (gnus-summary-insert-subject id header)
3519           ;; Set the (possibly) new article number in the data structure.
3520           (gnus-data-set-number data (gnus-id-to-article id))
3521         (setcar thread old)
3522         nil))))
3523
3524 (defun gnus-rebuild-thread (id &optional line)
3525   "Rebuild the thread containing ID.
3526 If LINE, insert the rebuilt thread starting on line LINE."
3527   (let ((buffer-read-only nil)
3528         old-pos current thread data)
3529     (if (not gnus-show-threads)
3530         (setq thread (list (car (gnus-id-to-thread id))))
3531       ;; Get the thread this article is part of.
3532       (setq thread (gnus-remove-thread id)))
3533     (setq old-pos (gnus-point-at-bol))
3534     (setq current (save-excursion
3535                     (and (zerop (forward-line -1))
3536                          (gnus-summary-article-number))))
3537     ;; If this is a gathered thread, we have to go some re-gathering.
3538     (when (stringp (car thread))
3539       (let ((subject (car thread))
3540             roots thr)
3541         (setq thread (cdr thread))
3542         (while thread
3543           (unless (memq (setq thr (gnus-id-to-thread
3544                                    (gnus-root-id
3545                                     (mail-header-id (caar thread)))))
3546                         roots)
3547             (push thr roots))
3548           (setq thread (cdr thread)))
3549         ;; We now have all (unique) roots.
3550         (if (= (length roots) 1)
3551             ;; All the loose roots are now one solid root.
3552             (setq thread (car roots))
3553           (setq thread (cons subject (gnus-sort-threads roots))))))
3554     (let (threads)
3555       ;; We then insert this thread into the summary buffer.
3556       (when line
3557         (goto-char (point-min))
3558         (forward-line (1- line)))
3559       (let (gnus-newsgroup-data gnus-newsgroup-threads)
3560         (if gnus-show-threads
3561             (gnus-summary-prepare-threads (gnus-cut-threads (list thread)))
3562           (gnus-summary-prepare-unthreaded thread))
3563         (setq data (nreverse gnus-newsgroup-data))
3564         (setq threads gnus-newsgroup-threads))
3565       ;; We splice the new data into the data structure.
3566       ;;!!! This is kinda bogus.  We assume that in LINE is non-nil,
3567       ;;!!! then we want to insert at the beginning of the buffer.
3568       ;;!!! That happens to be true with Gnus now, but that may
3569       ;;!!! change in the future.  Perhaps.
3570       (gnus-data-enter-list
3571        (if line nil current) data (- (point) old-pos))
3572       (setq gnus-newsgroup-threads
3573             (nconc threads gnus-newsgroup-threads))
3574       (gnus-data-compute-positions))))
3575
3576 (defun gnus-number-to-header (number)
3577   "Return the header for article NUMBER."
3578   (let ((headers gnus-newsgroup-headers))
3579     (while (and headers
3580                 (not (= number (mail-header-number (car headers)))))
3581       (pop headers))
3582     (when headers
3583       (car headers))))
3584
3585 (defun gnus-parent-headers (in-headers &optional generation)
3586   "Return the headers of the GENERATIONeth parent of HEADERS."
3587   (unless generation
3588     (setq generation 1))
3589   (let ((parent t)
3590         (headers in-headers)
3591         references)
3592     (while (and parent
3593                 (not (zerop generation))
3594                 (setq references (mail-header-references headers)))
3595       (setq headers (if (and references
3596                              (setq parent (gnus-parent-id references)))
3597                         (car (gnus-id-to-thread parent))
3598                       nil))
3599       (decf generation))
3600     (and (not (eq headers in-headers))
3601          headers)))
3602
3603 (defun gnus-id-to-thread (id)
3604   "Return the (sub-)thread where ID appears."
3605   (gnus-gethash id gnus-newsgroup-dependencies))
3606
3607 (defun gnus-id-to-article (id)
3608   "Return the article number of ID."
3609   (let ((thread (gnus-id-to-thread id)))
3610     (when (and thread
3611                (car thread))
3612       (mail-header-number (car thread)))))
3613
3614 (defun gnus-id-to-header (id)
3615   "Return the article headers of ID."
3616   (car (gnus-id-to-thread id)))
3617
3618 (defun gnus-article-displayed-root-p (article)
3619   "Say whether ARTICLE is a root(ish) article."
3620   (let ((level (gnus-summary-thread-level article))
3621         (refs (mail-header-references  (gnus-summary-article-header article)))
3622         particle)
3623     (cond
3624      ((null level) nil)
3625      ((zerop level) t)
3626      ((null refs) t)
3627      ((null (gnus-parent-id refs)) t)
3628      ((and (= 1 level)
3629            (null (setq particle (gnus-id-to-article
3630                                  (gnus-parent-id refs))))
3631            (null (gnus-summary-thread-level particle)))))))
3632
3633 (defun gnus-root-id (id)
3634   "Return the id of the root of the thread where ID appears."
3635   (let (last-id prev)
3636     (while (and id (setq prev (car (gnus-id-to-thread id))))
3637       (setq last-id id
3638             id (gnus-parent-id (mail-header-references prev))))
3639     last-id))
3640
3641 (defun gnus-articles-in-thread (thread)
3642   "Return the list of articles in THREAD."
3643   (cons (mail-header-number (car thread))
3644         (apply 'nconc (mapcar 'gnus-articles-in-thread (cdr thread)))))
3645
3646 (defun gnus-remove-thread (id &optional dont-remove)
3647   "Remove the thread that has ID in it."
3648   (let (headers thread last-id)
3649     ;; First go up in this thread until we find the root.
3650     (setq last-id (gnus-root-id id)
3651           headers (message-flatten-list (gnus-id-to-thread last-id)))
3652     ;; We have now found the real root of this thread.  It might have
3653     ;; been gathered into some loose thread, so we have to search
3654     ;; through the threads to find the thread we wanted.
3655     (let ((threads gnus-newsgroup-threads)
3656           sub)
3657       (while threads
3658         (setq sub (car threads))
3659         (if (stringp (car sub))
3660             ;; This is a gathered thread, so we look at the roots
3661             ;; below it to find whether this article is in this
3662             ;; gathered root.
3663             (progn
3664               (setq sub (cdr sub))
3665               (while sub
3666                 (when (member (caar sub) headers)
3667                   (setq thread (car threads)
3668                         threads nil
3669                         sub nil))
3670                 (setq sub (cdr sub))))
3671           ;; It's an ordinary thread, so we check it.
3672           (when (eq (car sub) (car headers))
3673             (setq thread sub
3674                   threads nil)))
3675         (setq threads (cdr threads)))
3676       ;; If this article is in no thread, then it's a root.
3677       (if thread
3678           (unless dont-remove
3679             (setq gnus-newsgroup-threads (delq thread gnus-newsgroup-threads)))
3680         (setq thread (gnus-id-to-thread last-id)))
3681       (when thread
3682         (prog1
3683             thread                      ; We return this thread.
3684           (unless dont-remove
3685             (if (stringp (car thread))
3686                 (progn
3687                   ;; If we use dummy roots, then we have to remove the
3688                   ;; dummy root as well.
3689                   (when (eq gnus-summary-make-false-root 'dummy)
3690                     ;; We go to the dummy root by going to
3691                     ;; the first sub-"thread", and then one line up.
3692                     (gnus-summary-goto-article
3693                      (mail-header-number (caadr thread)))
3694                     (forward-line -1)
3695                     (gnus-delete-line)
3696                     (gnus-data-compute-positions))
3697                   (setq thread (cdr thread))
3698                   (while thread
3699                     (gnus-remove-thread-1 (car thread))
3700                     (setq thread (cdr thread))))
3701               (gnus-remove-thread-1 thread))))))))
3702
3703 (defun gnus-remove-thread-1 (thread)
3704   "Remove the thread THREAD recursively."
3705   (let ((number (mail-header-number (pop thread)))
3706         d)
3707     (setq thread (reverse thread))
3708     (while thread
3709       (gnus-remove-thread-1 (pop thread)))
3710     (when (setq d (gnus-data-find number))
3711       (goto-char (gnus-data-pos d))
3712       (gnus-summary-show-thread)
3713       (gnus-data-remove
3714        number
3715        (- (gnus-point-at-bol)
3716           (prog1
3717               (1+ (gnus-point-at-eol))
3718             (gnus-delete-line)))))))
3719
3720 (defun gnus-sort-threads-1 (threads func)
3721   (sort (mapcar (lambda (thread)
3722                   (cons (car thread)
3723                         (and (cdr thread)
3724                              (gnus-sort-threads-1 (cdr thread) func))))
3725                 threads) func))
3726
3727 (defun gnus-sort-threads (threads)
3728   "Sort THREADS."
3729   (if (not gnus-thread-sort-functions)
3730       threads
3731     (gnus-message 8 "Sorting threads...")
3732     (prog1
3733         (gnus-sort-threads-1
3734          threads
3735          (gnus-make-sort-function gnus-thread-sort-functions))
3736       (gnus-message 8 "Sorting threads...done"))))
3737
3738 (defun gnus-sort-articles (articles)
3739   "Sort ARTICLES."
3740   (when gnus-article-sort-functions
3741     (gnus-message 7 "Sorting articles...")
3742     (prog1
3743         (setq gnus-newsgroup-headers
3744               (sort articles (gnus-make-sort-function
3745                               gnus-article-sort-functions)))
3746       (gnus-message 7 "Sorting articles...done"))))
3747
3748 ;; Written by Hallvard B Furuseth <h.b.furuseth@usit.uio.no>.
3749 (defmacro gnus-thread-header (thread)
3750   "Return header of first article in THREAD.
3751 Note that THREAD must never, ever be anything else than a variable -
3752 using some other form will lead to serious barfage."
3753   (or (symbolp thread) (signal 'wrong-type-argument '(symbolp thread)))
3754   ;; (8% speedup to gnus-summary-prepare, just for fun :-)
3755   (list 'byte-code "\10\211:\203\17\0\211@;\203\16\0A@@\207"
3756         (vector thread) 2))
3757
3758 (defsubst gnus-article-sort-by-number (h1 h2)
3759   "Sort articles by article number."
3760   (< (mail-header-number h1)
3761      (mail-header-number h2)))
3762
3763 (defun gnus-thread-sort-by-number (h1 h2)
3764   "Sort threads by root article number."
3765   (gnus-article-sort-by-number
3766    (gnus-thread-header h1) (gnus-thread-header h2)))
3767
3768 (defsubst gnus-article-sort-by-lines (h1 h2)
3769   "Sort articles by article Lines header."
3770   (< (mail-header-lines h1)
3771      (mail-header-lines h2)))
3772
3773 (defun gnus-thread-sort-by-lines (h1 h2)
3774   "Sort threads by root article Lines header."
3775   (gnus-article-sort-by-lines
3776    (gnus-thread-header h1) (gnus-thread-header h2)))
3777
3778 (defsubst gnus-article-sort-by-chars (h1 h2)
3779   "Sort articles by octet length."
3780   (< (mail-header-chars h1)
3781      (mail-header-chars h2)))
3782
3783 (defun gnus-thread-sort-by-chars (h1 h2)
3784   "Sort threads by root article octet length."
3785   (gnus-article-sort-by-chars
3786    (gnus-thread-header h1) (gnus-thread-header h2)))
3787
3788 (defsubst gnus-article-sort-by-author (h1 h2)
3789   "Sort articles by root author."
3790   (string-lessp
3791    (let ((extract (funcall
3792                    gnus-extract-address-components
3793                    (mail-header-from h1))))
3794      (or (car extract) (cadr extract) ""))
3795    (let ((extract (funcall
3796                    gnus-extract-address-components
3797                    (mail-header-from h2))))
3798      (or (car extract) (cadr extract) ""))))
3799
3800 (defun gnus-thread-sort-by-author (h1 h2)
3801   "Sort threads by root author."
3802   (gnus-article-sort-by-author
3803    (gnus-thread-header h1)  (gnus-thread-header h2)))
3804
3805 (defsubst gnus-article-sort-by-subject (h1 h2)
3806   "Sort articles by root subject."
3807   (string-lessp
3808    (downcase (gnus-simplify-subject-re (mail-header-subject h1)))
3809    (downcase (gnus-simplify-subject-re (mail-header-subject h2)))))
3810
3811 (defun gnus-thread-sort-by-subject (h1 h2)
3812   "Sort threads by root subject."
3813   (gnus-article-sort-by-subject
3814    (gnus-thread-header h1) (gnus-thread-header h2)))
3815
3816 (defsubst gnus-article-sort-by-date (h1 h2)
3817   "Sort articles by root article date."
3818   (time-less-p
3819    (gnus-date-get-time (mail-header-date h1))
3820    (gnus-date-get-time (mail-header-date h2))))
3821
3822 (defun gnus-thread-sort-by-date (h1 h2)
3823   "Sort threads by root article date."
3824   (gnus-article-sort-by-date
3825    (gnus-thread-header h1) (gnus-thread-header h2)))
3826
3827 (defsubst gnus-article-sort-by-score (h1 h2)
3828   "Sort articles by root article score.
3829 Unscored articles will be counted as having a score of zero."
3830   (> (or (cdr (assq (mail-header-number h1)
3831                     gnus-newsgroup-scored))
3832          gnus-summary-default-score 0)
3833      (or (cdr (assq (mail-header-number h2)
3834                     gnus-newsgroup-scored))
3835          gnus-summary-default-score 0)))
3836
3837 (defun gnus-thread-sort-by-score (h1 h2)
3838   "Sort threads by root article score."
3839   (gnus-article-sort-by-score
3840    (gnus-thread-header h1) (gnus-thread-header h2)))
3841
3842 (defun gnus-thread-sort-by-total-score (h1 h2)
3843   "Sort threads by the sum of all scores in the thread.
3844 Unscored articles will be counted as having a score of zero."
3845   (> (gnus-thread-total-score h1) (gnus-thread-total-score h2)))
3846
3847 (defun gnus-thread-total-score (thread)
3848   ;; This function find the total score of THREAD.
3849   (cond ((null thread)
3850          0)
3851         ((consp thread)
3852          (if (stringp (car thread))
3853              (apply gnus-thread-score-function 0
3854                     (mapcar 'gnus-thread-total-score-1 (cdr thread)))
3855            (gnus-thread-total-score-1 thread)))
3856         (t
3857          (gnus-thread-total-score-1 (list thread)))))
3858
3859 (defun gnus-thread-total-score-1 (root)
3860   ;; This function find the total score of the thread below ROOT.
3861   (setq root (car root))
3862   (apply gnus-thread-score-function
3863          (or (append
3864               (mapcar 'gnus-thread-total-score
3865                       (cdr (gnus-id-to-thread (mail-header-id root))))
3866               (when (> (mail-header-number root) 0)
3867                 (list (or (cdr (assq (mail-header-number root)
3868                                      gnus-newsgroup-scored))
3869                           gnus-summary-default-score 0))))
3870              (list gnus-summary-default-score)
3871              '(0))))
3872
3873 ;; Added by Per Abrahamsen <amanda@iesd.auc.dk>.
3874 (defvar gnus-tmp-prev-subject nil)
3875 (defvar gnus-tmp-false-parent nil)
3876 (defvar gnus-tmp-root-expunged nil)
3877 (defvar gnus-tmp-dummy-line nil)
3878
3879 (eval-when-compile (defvar gnus-tmp-header))
3880 (defun gnus-extra-header (type &optional header)
3881   "Return the extra header of TYPE."
3882   (or (cdr (assq type (mail-header-extra (or header gnus-tmp-header))))
3883       ""))
3884
3885 (defun gnus-summary-prepare-threads (threads)
3886   "Prepare summary buffer from THREADS and indentation LEVEL.
3887 THREADS is either a list of `(PARENT [(CHILD1 [(GRANDCHILD ...]...) ...])'
3888 or a straight list of headers."
3889   (gnus-message 7 "Generating summary...")
3890
3891   (setq gnus-newsgroup-threads threads)
3892   (beginning-of-line)
3893
3894   (let ((gnus-tmp-level 0)
3895         (default-score (or gnus-summary-default-score 0))
3896         (gnus-visual-p (gnus-visual-p 'summary-highlight 'highlight))
3897         thread number subject stack state gnus-tmp-gathered beg-match
3898         new-roots gnus-tmp-new-adopts thread-end
3899         gnus-tmp-header gnus-tmp-unread
3900         gnus-tmp-replied gnus-tmp-subject-or-nil
3901         gnus-tmp-dummy gnus-tmp-indentation gnus-tmp-lines gnus-tmp-score
3902         gnus-tmp-score-char gnus-tmp-from gnus-tmp-name
3903         gnus-tmp-number gnus-tmp-opening-bracket gnus-tmp-closing-bracket)
3904
3905     (setq gnus-tmp-prev-subject nil)
3906
3907     (if (vectorp (car threads))
3908         ;; If this is a straight (sic) list of headers, then a
3909         ;; threaded summary display isn't required, so we just create
3910         ;; an unthreaded one.
3911         (gnus-summary-prepare-unthreaded threads)
3912
3913       ;; Do the threaded display.
3914
3915       (while (or threads stack gnus-tmp-new-adopts new-roots)
3916
3917         (if (and (= gnus-tmp-level 0)
3918                  (or (not stack)
3919                      (= (caar stack) 0))
3920                  (not gnus-tmp-false-parent)
3921                  (or gnus-tmp-new-adopts new-roots))
3922             (if gnus-tmp-new-adopts
3923                 (setq gnus-tmp-level (if gnus-tmp-root-expunged 0 1)
3924                       thread (list (car gnus-tmp-new-adopts))
3925                       gnus-tmp-header (caar thread)
3926                       gnus-tmp-new-adopts (cdr gnus-tmp-new-adopts))
3927               (when new-roots
3928                 (setq thread (list (car new-roots))
3929                       gnus-tmp-header (caar thread)
3930                       new-roots (cdr new-roots))))
3931
3932           (if threads
3933               ;; If there are some threads, we do them before the
3934               ;; threads on the stack.
3935               (setq thread threads
3936                     gnus-tmp-header (caar thread))
3937             ;; There were no current threads, so we pop something off
3938             ;; the stack.
3939             (setq state (car stack)
3940                   gnus-tmp-level (car state)
3941                   thread (cdr state)
3942                   stack (cdr stack)
3943                   gnus-tmp-header (caar thread))))
3944
3945         (setq gnus-tmp-false-parent nil)
3946         (setq gnus-tmp-root-expunged nil)
3947         (setq thread-end nil)
3948
3949         (if (stringp gnus-tmp-header)
3950             ;; The header is a dummy root.
3951             (cond
3952              ((eq gnus-summary-make-false-root 'adopt)
3953               ;; We let the first article adopt the rest.
3954               (setq gnus-tmp-new-adopts (nconc gnus-tmp-new-adopts
3955                                                (cddar thread)))
3956               (setq gnus-tmp-gathered
3957                     (nconc (mapcar
3958                             (lambda (h) (mail-header-number (car h)))
3959                             (cddar thread))
3960                            gnus-tmp-gathered))
3961               (setq thread (cons (list (caar thread)
3962                                        (cadar thread))
3963                                  (cdr thread)))
3964               (setq gnus-tmp-level -1
3965                     gnus-tmp-false-parent t))
3966              ((eq gnus-summary-make-false-root 'empty)
3967               ;; We print adopted articles with empty subject fields.
3968               (setq gnus-tmp-gathered
3969                     (nconc (mapcar
3970                             (lambda (h) (mail-header-number (car h)))
3971                             (cddar thread))
3972                            gnus-tmp-gathered))
3973               (setq gnus-tmp-level -1))
3974              ((eq gnus-summary-make-false-root 'dummy)
3975               ;; We remember that we probably want to output a dummy
3976               ;; root.
3977               (setq gnus-tmp-dummy-line gnus-tmp-header)
3978               (setq gnus-tmp-prev-subject gnus-tmp-header))
3979              (t
3980               ;; We do not make a root for the gathered
3981               ;; sub-threads at all.
3982               (setq gnus-tmp-level -1)))
3983
3984           (setq number (mail-header-number gnus-tmp-header)
3985                 subject (mail-header-subject gnus-tmp-header))
3986
3987           (cond
3988            ;; If the thread has changed subject, we might want to make
3989            ;; this subthread into a root.
3990            ((and (null gnus-thread-ignore-subject)
3991                  (not (zerop gnus-tmp-level))
3992                  gnus-tmp-prev-subject
3993                  (not (inline
3994                         (gnus-subject-equal gnus-tmp-prev-subject subject))))
3995             (setq new-roots (nconc new-roots (list (car thread)))
3996                   thread-end t
3997                   gnus-tmp-header nil))
3998            ;; If the article lies outside the current limit,
3999            ;; then we do not display it.
4000            ((not (memq number gnus-newsgroup-limit))
4001             (setq gnus-tmp-gathered
4002                   (nconc (mapcar
4003                           (lambda (h) (mail-header-number (car h)))
4004                           (cdar thread))
4005                          gnus-tmp-gathered))
4006             (setq gnus-tmp-new-adopts (if (cdar thread)
4007                                           (append gnus-tmp-new-adopts
4008                                                   (cdar thread))
4009                                         gnus-tmp-new-adopts)
4010                   thread-end t
4011                   gnus-tmp-header nil)
4012             (when (zerop gnus-tmp-level)
4013               (setq gnus-tmp-root-expunged t)))
4014            ;; Perhaps this article is to be marked as read?
4015            ((and gnus-summary-mark-below
4016                  (< (or (cdr (assq number gnus-newsgroup-scored))
4017                         default-score)
4018                     gnus-summary-mark-below)
4019                  ;; Don't touch sparse articles.
4020                  (not (gnus-summary-article-sparse-p number))
4021                  (not (gnus-summary-article-ancient-p number)))
4022             (setq gnus-newsgroup-unreads
4023                   (delq number gnus-newsgroup-unreads))
4024             (if gnus-newsgroup-auto-expire
4025                 (push number gnus-newsgroup-expirable)
4026               (push (cons number gnus-low-score-mark)
4027                     gnus-newsgroup-reads))))
4028
4029           (when gnus-tmp-header
4030             ;; We may have an old dummy line to output before this
4031             ;; article.
4032             (when (and gnus-tmp-dummy-line
4033                        (gnus-subject-equal
4034                         gnus-tmp-dummy-line
4035                         (mail-header-subject gnus-tmp-header)))
4036               (gnus-summary-insert-dummy-line
4037                gnus-tmp-dummy-line (mail-header-number gnus-tmp-header))
4038               (setq gnus-tmp-dummy-line nil))
4039
4040             ;; Compute the mark.
4041             (setq gnus-tmp-unread (gnus-article-mark number))
4042
4043             (push (gnus-data-make number gnus-tmp-unread (1+ (point))
4044                                   gnus-tmp-header gnus-tmp-level)
4045                   gnus-newsgroup-data)
4046
4047             ;; Actually insert the line.
4048             (setq
4049              gnus-tmp-subject-or-nil
4050              (cond
4051               ((and gnus-thread-ignore-subject
4052                     gnus-tmp-prev-subject
4053                     (not (inline (gnus-subject-equal
4054                                   gnus-tmp-prev-subject subject))))
4055                subject)
4056               ((zerop gnus-tmp-level)
4057                (if (and (eq gnus-summary-make-false-root 'empty)
4058                         (memq number gnus-tmp-gathered)
4059                         gnus-tmp-prev-subject
4060                         (inline (gnus-subject-equal
4061                                  gnus-tmp-prev-subject subject)))
4062                    gnus-summary-same-subject
4063                  subject))
4064               (t gnus-summary-same-subject)))
4065             (if (and (eq gnus-summary-make-false-root 'adopt)
4066                      (= gnus-tmp-level 1)
4067                      (memq number gnus-tmp-gathered))
4068                 (setq gnus-tmp-opening-bracket ?\<
4069                       gnus-tmp-closing-bracket ?\>)
4070               (setq gnus-tmp-opening-bracket ?\[
4071                     gnus-tmp-closing-bracket ?\]))
4072             (setq
4073              gnus-tmp-indentation
4074              (aref gnus-thread-indent-array gnus-tmp-level)
4075              gnus-tmp-lines (mail-header-lines gnus-tmp-header)
4076              gnus-tmp-score (or (cdr (assq number gnus-newsgroup-scored))
4077                                 gnus-summary-default-score 0)
4078              gnus-tmp-score-char
4079              (if (or (null gnus-summary-default-score)
4080                      (<= (abs (- gnus-tmp-score gnus-summary-default-score))
4081                          gnus-summary-zcore-fuzz))
4082                  ?  ;Whitespace
4083                (if (< gnus-tmp-score gnus-summary-default-score)
4084                    gnus-score-below-mark gnus-score-over-mark))
4085              gnus-tmp-replied
4086              (cond ((memq number gnus-newsgroup-processable)
4087                     gnus-process-mark)
4088                    ((memq number gnus-newsgroup-cached)
4089                     gnus-cached-mark)
4090                    ((memq number gnus-newsgroup-replied)
4091                     gnus-replied-mark)
4092                    ((memq number gnus-newsgroup-saved)
4093                     gnus-saved-mark)
4094                    (t gnus-unread-mark))
4095              gnus-tmp-from (mail-header-from gnus-tmp-header)
4096              gnus-tmp-name
4097              (cond
4098               ((string-match "<[^>]+> *$" gnus-tmp-from)
4099                (setq beg-match (match-beginning 0))
4100                (or (and (string-match "^\"[^\"]*\"" gnus-tmp-from)
4101                         (substring gnus-tmp-from (1+ (match-beginning 0))
4102                                    (1- (match-end 0))))
4103                    (substring gnus-tmp-from 0 beg-match)))
4104               ((string-match "(.+)" gnus-tmp-from)
4105                (substring gnus-tmp-from
4106                           (1+ (match-beginning 0)) (1- (match-end 0))))
4107               (t gnus-tmp-from)))
4108             (when (string= gnus-tmp-name "")
4109               (setq gnus-tmp-name gnus-tmp-from))
4110             (unless (numberp gnus-tmp-lines)
4111               (setq gnus-tmp-lines 0))
4112             (gnus-put-text-property
4113              (point)
4114              (progn (eval gnus-summary-line-format-spec) (point))
4115              'gnus-number number)
4116             (when gnus-visual-p
4117               (forward-line -1)
4118               (gnus-run-hooks 'gnus-summary-update-hook)
4119               (forward-line 1))
4120
4121             (setq gnus-tmp-prev-subject subject)))
4122
4123         (when (nth 1 thread)
4124           (push (cons (max 0 gnus-tmp-level) (nthcdr 1 thread)) stack))
4125         (incf gnus-tmp-level)
4126         (setq threads (if thread-end nil (cdar thread)))
4127         (unless threads
4128           (setq gnus-tmp-level 0)))))
4129   (gnus-message 7 "Generating summary...done"))
4130
4131 (defun gnus-summary-prepare-unthreaded (headers)
4132   "Generate an unthreaded summary buffer based on HEADERS."
4133   (let (header number mark)
4134
4135     (beginning-of-line)
4136
4137     (while headers
4138       ;; We may have to root out some bad articles...
4139       (when (memq (setq number (mail-header-number
4140                                 (setq header (pop headers))))
4141                   gnus-newsgroup-limit)
4142         ;; Mark article as read when it has a low score.
4143         (when (and gnus-summary-mark-below
4144                    (< (or (cdr (assq number gnus-newsgroup-scored))
4145                           gnus-summary-default-score 0)
4146                       gnus-summary-mark-below)
4147                    (not (gnus-summary-article-ancient-p number)))
4148           (setq gnus-newsgroup-unreads
4149                 (delq number gnus-newsgroup-unreads))
4150           (if gnus-newsgroup-auto-expire
4151               (push number gnus-newsgroup-expirable)
4152             (push (cons number gnus-low-score-mark)
4153                   gnus-newsgroup-reads)))
4154
4155         (setq mark (gnus-article-mark number))
4156         (push (gnus-data-make number mark (1+ (point)) header 0)
4157               gnus-newsgroup-data)
4158         (gnus-summary-insert-line
4159          header 0 number
4160          mark (memq number gnus-newsgroup-replied)
4161          (memq number gnus-newsgroup-expirable)
4162          (mail-header-subject header) nil
4163          (cdr (assq number gnus-newsgroup-scored))
4164          (memq number gnus-newsgroup-processable))))))
4165
4166 (defun gnus-summary-remove-list-identifiers ()
4167   "Remove list identifiers in `gnus-list-identifiers' from articles in the current group."
4168   (let ((regexp (if (stringp gnus-list-identifiers)
4169                     gnus-list-identifiers
4170                   (mapconcat 'identity gnus-list-identifiers " *\\|"))))
4171     (dolist (header gnus-newsgroup-headers)
4172       (when (string-match (concat "\\(\\(\\(Re: +\\)?\\(" regexp
4173                                   " *\\)\\)+\\(Re: +\\)?\\)")
4174                           (mail-header-subject header))
4175         (mail-header-set-subject
4176          header (concat (substring (mail-header-subject header)
4177                                    0 (match-beginning 1))
4178                         (or
4179                          (match-string 3 (mail-header-subject header))
4180                          (match-string 5 (mail-header-subject header)))
4181                         (substring (mail-header-subject header)
4182                                    (match-end 1))))))))
4183
4184 (defun gnus-select-newsgroup (group &optional read-all select-articles)
4185   "Select newsgroup GROUP.
4186 If READ-ALL is non-nil, all articles in the group are selected.
4187 If SELECT-ARTICLES, only select those articles from GROUP."
4188   (let* ((entry (gnus-gethash group gnus-newsrc-hashtb))
4189          ;;!!! Dirty hack; should be removed.
4190          (gnus-summary-ignore-duplicates
4191           (if (eq (car (gnus-find-method-for-group group)) 'nnvirtual)
4192               t
4193             gnus-summary-ignore-duplicates))
4194          (info (nth 2 entry))
4195          articles fetched-articles cached)
4196
4197     (unless (gnus-check-server
4198              (setq gnus-current-select-method
4199                    (gnus-find-method-for-group group)))
4200       (error "Couldn't open server"))
4201
4202     (or (and entry (not (eq (car entry) t))) ; Either it's active...
4203         (gnus-activate-group group)     ; Or we can activate it...
4204         (progn                          ; Or we bug out.
4205           (when (equal major-mode 'gnus-summary-mode)
4206             (kill-buffer (current-buffer)))
4207           (error "Couldn't request group %s: %s"
4208                  group (gnus-status-message group))))
4209
4210     (unless (gnus-request-group group t)
4211       (when (equal major-mode 'gnus-summary-mode)
4212         (kill-buffer (current-buffer)))
4213       (error "Couldn't request group %s: %s"
4214              group (gnus-status-message group)))
4215
4216     (setq gnus-newsgroup-name group)
4217     (setq gnus-newsgroup-unselected nil)
4218     (setq gnus-newsgroup-unreads (gnus-list-of-unread-articles group))
4219     (gnus-summary-setup-default-charset)
4220
4221     ;; Adjust and set lists of article marks.
4222     (when info
4223       (gnus-adjust-marked-articles info))
4224
4225     ;; Kludge to avoid having cached articles nixed out in virtual groups.
4226     (when (gnus-virtual-group-p group)
4227       (setq cached gnus-newsgroup-cached))
4228
4229     (setq gnus-newsgroup-unreads
4230           (gnus-set-difference
4231            (gnus-set-difference gnus-newsgroup-unreads gnus-newsgroup-marked)
4232            gnus-newsgroup-dormant))
4233
4234     (setq gnus-newsgroup-processable nil)
4235
4236     (gnus-update-read-articles group gnus-newsgroup-unreads)
4237
4238     (if (setq articles select-articles)
4239         (setq gnus-newsgroup-unselected
4240               (gnus-sorted-intersection
4241                gnus-newsgroup-unreads
4242                (gnus-sorted-complement gnus-newsgroup-unreads articles)))
4243       (setq articles (gnus-articles-to-read group read-all)))
4244
4245     (cond
4246      ((null articles)
4247       ;;(gnus-message 3 "Couldn't select newsgroup -- no articles to display")
4248       'quit)
4249      ((eq articles 0) nil)
4250      (t
4251       ;; Init the dependencies hash table.
4252       (setq gnus-newsgroup-dependencies
4253             (gnus-make-hashtable (length articles)))
4254       (gnus-set-global-variables)
4255       ;; Retrieve the headers and read them in.
4256       (gnus-message 5 "Fetching headers for %s..." gnus-newsgroup-name)
4257       (setq gnus-newsgroup-headers
4258             (if (eq 'nov
4259                     (setq gnus-headers-retrieved-by
4260                           (gnus-retrieve-headers
4261                            articles gnus-newsgroup-name
4262                            ;; We might want to fetch old headers, but
4263                            ;; not if there is only 1 article.
4264                            (and (or (and
4265                                      (not (eq gnus-fetch-old-headers 'some))
4266                                      (not (numberp gnus-fetch-old-headers)))
4267                                     (> (length articles) 1))
4268                                 gnus-fetch-old-headers))))
4269                 (gnus-get-newsgroup-headers-xover
4270                  articles nil nil gnus-newsgroup-name t)
4271               (gnus-get-newsgroup-headers)))
4272       (gnus-message 5 "Fetching headers for %s...done" gnus-newsgroup-name)
4273
4274       ;; Kludge to avoid having cached articles nixed out in virtual groups.
4275       (when cached
4276         (setq gnus-newsgroup-cached cached))
4277
4278       ;; Suppress duplicates?
4279       (when gnus-suppress-duplicates
4280         (gnus-dup-suppress-articles))
4281
4282       ;; Set the initial limit.
4283       (setq gnus-newsgroup-limit (copy-sequence articles))
4284       ;; Remove canceled articles from the list of unread articles.
4285       (setq gnus-newsgroup-unreads
4286             (gnus-set-sorted-intersection
4287              gnus-newsgroup-unreads
4288              (setq fetched-articles
4289                    (mapcar (lambda (headers) (mail-header-number headers))
4290                            gnus-newsgroup-headers))))
4291       ;; Removed marked articles that do not exist.
4292       (gnus-update-missing-marks
4293        (gnus-sorted-complement fetched-articles articles))
4294       ;; We might want to build some more threads first.
4295       (when (and gnus-fetch-old-headers
4296                  (eq gnus-headers-retrieved-by 'nov))
4297         (if (eq gnus-fetch-old-headers 'invisible)
4298             (gnus-build-all-threads)
4299           (gnus-build-old-threads)))
4300       ;; Let the Gnus agent mark articles as read.
4301       (when gnus-agent
4302         (gnus-agent-get-undownloaded-list))
4303       ;; Remove list identifiers from subject
4304       (when gnus-list-identifiers
4305         (gnus-summary-remove-list-identifiers))
4306       ;; Check whether auto-expire is to be done in this group.
4307       (setq gnus-newsgroup-auto-expire
4308             (gnus-group-auto-expirable-p group))
4309       ;; Set up the article buffer now, if necessary.
4310       (unless gnus-single-article-buffer
4311         (gnus-article-setup-buffer))
4312       ;; First and last article in this newsgroup.
4313       (when gnus-newsgroup-headers
4314         (setq gnus-newsgroup-begin
4315               (mail-header-number (car gnus-newsgroup-headers))
4316               gnus-newsgroup-end
4317               (mail-header-number
4318                (gnus-last-element gnus-newsgroup-headers))))
4319       ;; GROUP is successfully selected.
4320       (or gnus-newsgroup-headers t)))))
4321
4322 (defun gnus-articles-to-read (group &optional read-all)
4323   "Find out what articles the user wants to read."
4324   (let* ((articles
4325           ;; Select all articles if `read-all' is non-nil, or if there
4326           ;; are no unread articles.
4327           (if (or read-all
4328                   (and (zerop (length gnus-newsgroup-marked))
4329                        (zerop (length gnus-newsgroup-unreads)))
4330                   (eq (gnus-group-find-parameter group 'display)
4331                       'all))
4332               (or
4333                (gnus-uncompress-range (gnus-active group))
4334                (gnus-cache-articles-in-group group))
4335             (sort (append gnus-newsgroup-dormant gnus-newsgroup-marked
4336                           (copy-sequence gnus-newsgroup-unreads))
4337                   '<)))
4338          (scored-list (gnus-killed-articles gnus-newsgroup-killed articles))
4339          (scored (length scored-list))
4340          (number (length articles))
4341          (marked (+ (length gnus-newsgroup-marked)
4342                     (length gnus-newsgroup-dormant)))
4343          (select
4344           (cond
4345            ((numberp read-all)
4346             read-all)
4347            (t
4348             (condition-case ()
4349                 (cond
4350                  ((and (or (<= scored marked) (= scored number))
4351                        (numberp gnus-large-newsgroup)
4352                        (> number gnus-large-newsgroup))
4353                   (let ((input
4354                          (read-string
4355                           (format
4356                            "How many articles from %s (default %d): "
4357                            (gnus-limit-string gnus-newsgroup-name 35)
4358                            number))))
4359                     (if (string-match "^[ \t]*$" input) number input)))
4360                  ((and (> scored marked) (< scored number)
4361                        (> (- scored number) 20))
4362                   (let ((input
4363                          (read-string
4364                           (format "%s %s (%d scored, %d total): "
4365                                   "How many articles from"
4366                                   group scored number))))
4367                     (if (string-match "^[ \t]*$" input)
4368                         number input)))
4369                  (t number))
4370               (quit
4371                (message "Quit getting the articles to read")
4372                nil))))))
4373     (setq select (if (stringp select) (string-to-number select) select))
4374     (if (or (null select) (zerop select))
4375         select
4376       (if (and (not (zerop scored)) (<= (abs select) scored))
4377           (progn
4378             (setq articles (sort scored-list '<))
4379             (setq number (length articles)))
4380         (setq articles (copy-sequence articles)))
4381
4382       (when (< (abs select) number)
4383         (if (< select 0)
4384             ;; Select the N oldest articles.
4385             (setcdr (nthcdr (1- (abs select)) articles) nil)
4386           ;; Select the N most recent articles.
4387           (setq articles (nthcdr (- number select) articles))))
4388       (setq gnus-newsgroup-unselected
4389             (gnus-sorted-intersection
4390              gnus-newsgroup-unreads
4391              (gnus-sorted-complement gnus-newsgroup-unreads articles)))
4392       (when gnus-alter-articles-to-read-function
4393         (setq gnus-newsgroup-unreads
4394               (sort
4395                (funcall gnus-alter-articles-to-read-function
4396                         gnus-newsgroup-name gnus-newsgroup-unreads)
4397                '<)))
4398       articles)))
4399
4400 (defun gnus-killed-articles (killed articles)
4401   (let (out)
4402     (while articles
4403       (when (inline (gnus-member-of-range (car articles) killed))
4404         (push (car articles) out))
4405       (setq articles (cdr articles)))
4406     out))
4407
4408 (defun gnus-uncompress-marks (marks)
4409   "Uncompress the mark ranges in MARKS."
4410   (let ((uncompressed '(score bookmark))
4411         out)
4412     (while marks
4413       (if (memq (caar marks) uncompressed)
4414           (push (car marks) out)
4415         (push (cons (caar marks) (gnus-uncompress-range (cdar marks))) out))
4416       (setq marks (cdr marks)))
4417     out))
4418
4419 (defun gnus-adjust-marked-articles (info)
4420   "Set all article lists and remove all marks that are no longer valid."
4421   (let* ((marked-lists (gnus-info-marks info))
4422          (active (gnus-active (gnus-info-group info)))
4423          (min (car active))
4424          (max (cdr active))
4425          (types gnus-article-mark-lists)
4426          (uncompressed '(score bookmark killed))
4427          marks var articles article mark)
4428
4429     (while marked-lists
4430       (setq marks (pop marked-lists))
4431       (set (setq var (intern (format "gnus-newsgroup-%s"
4432                                      (car (rassq (setq mark (car marks))
4433                                                  types)))))
4434            (if (memq (car marks) uncompressed) (cdr marks)
4435              (gnus-uncompress-range (cdr marks))))
4436
4437       (setq articles (symbol-value var))
4438
4439       ;; All articles have to be subsets of the active articles.
4440       (cond
4441        ;; Adjust "simple" lists.
4442        ((memq mark '(tick dormant expire reply save))
4443         (while articles
4444           (when (or (< (setq article (pop articles)) min) (> article max))
4445             (set var (delq article (symbol-value var))))))
4446        ;; Adjust assocs.
4447        ((memq mark uncompressed)
4448         (when (not (listp (cdr (symbol-value var))))
4449           (set var (list (symbol-value var))))
4450         (when (not (listp (cdr articles)))
4451           (setq articles (list articles)))
4452         (while articles
4453           (when (or (not (consp (setq article (pop articles))))
4454                     (< (car article) min)
4455                     (> (car article) max))
4456             (set var (delq article (symbol-value var))))))))))
4457
4458 (defun gnus-update-missing-marks (missing)
4459   "Go through the list of MISSING articles and remove them from the mark lists."
4460   (when missing
4461     (let ((types gnus-article-mark-lists)
4462           var m)
4463       ;; Go through all types.
4464       (while types
4465         (setq var (intern (format "gnus-newsgroup-%s" (car (pop types)))))
4466         (when (symbol-value var)
4467           ;; This list has articles.  So we delete all missing articles
4468           ;; from it.
4469           (setq m missing)
4470           (while m
4471             (set var (delq (pop m) (symbol-value var)))))))))
4472
4473 (defun gnus-update-marks ()
4474   "Enter the various lists of marked articles into the newsgroup info list."
4475   (let ((types gnus-article-mark-lists)
4476         (info (gnus-get-info gnus-newsgroup-name))
4477         (uncompressed '(score bookmark killed))
4478         type list newmarked symbol delta-marks)
4479     (when info
4480       ;; Add all marks lists to the list of marks lists.
4481       (while (setq type (pop types))
4482         (setq list (symbol-value
4483                     (setq symbol
4484                           (intern (format "gnus-newsgroup-%s"
4485                                           (car type))))))
4486
4487         (when list
4488           ;; Get rid of the entries of the articles that have the
4489           ;; default score.
4490           (when (and (eq (cdr type) 'score)
4491                      gnus-save-score
4492                      list)
4493             (let* ((arts list)
4494                    (prev (cons nil list))
4495                    (all prev))
4496               (while arts
4497                 (if (or (not (consp (car arts)))
4498                         (= (cdar arts) gnus-summary-default-score))
4499                     (setcdr prev (cdr arts))
4500                   (setq prev arts))
4501                 (setq arts (cdr arts)))
4502               (setq list (cdr all)))))
4503
4504         (unless (memq (cdr type) uncompressed)
4505           (setq list (gnus-compress-sequence (set symbol (sort list '<)) t)))
4506
4507         (when (gnus-check-backend-function
4508                'request-set-mark gnus-newsgroup-name)
4509           ;; propagate flags to server, with the following exceptions:
4510           ;; uncompressed:s are not proper flags (they are cons cells)
4511           ;; cache is a internal gnus flag
4512           ;; download are local to one gnus installation (well)
4513           ;; unsend are for nndraft groups only
4514           ;; xxx: generality of this?  this suits nnimap anyway
4515           (unless (memq (cdr type) (append '(cache download unsend)
4516                                            uncompressed))
4517             (let* ((old (cdr (assq (cdr type) (gnus-info-marks info))))
4518                    (del (gnus-remove-from-range (gnus-copy-sequence old) list))
4519                    (add (gnus-remove-from-range
4520                          (gnus-copy-sequence list) old)))
4521               (when add
4522                 (push (list add 'add (list (cdr type))) delta-marks))
4523               (when del
4524                 (push (list del 'del (list (cdr type))) delta-marks)))))
4525
4526         (when list
4527           (push (cons (cdr type) list) newmarked)))
4528
4529       (when delta-marks
4530         (unless (gnus-check-group gnus-newsgroup-name)
4531           (error "Can't open server for %s" gnus-newsgroup-name))
4532         (gnus-request-set-mark gnus-newsgroup-name delta-marks))
4533
4534       ;; Enter these new marks into the info of the group.
4535       (if (nthcdr 3 info)
4536           (setcar (nthcdr 3 info) newmarked)
4537         ;; Add the marks lists to the end of the info.
4538         (when newmarked
4539           (setcdr (nthcdr 2 info) (list newmarked))))
4540
4541       ;; Cut off the end of the info if there's nothing else there.
4542       (let ((i 5))
4543         (while (and (> i 2)
4544                     (not (nth i info)))
4545           (when (nthcdr (decf i) info)
4546             (setcdr (nthcdr i info) nil)))))))
4547
4548 (defun gnus-set-mode-line (where)
4549   "Set the mode line of the article or summary buffers.
4550 If WHERE is `summary', the summary mode line format will be used."
4551   ;; Is this mode line one we keep updated?
4552   (when (and (memq where gnus-updated-mode-lines)
4553              (symbol-value
4554               (intern (format "gnus-%s-mode-line-format-spec" where))))
4555     (let (mode-string)
4556       (save-excursion
4557         ;; We evaluate this in the summary buffer since these
4558         ;; variables are buffer-local to that buffer.
4559         (set-buffer gnus-summary-buffer)
4560         ;; We bind all these variables that are used in the `eval' form
4561         ;; below.
4562         (let* ((mformat (symbol-value
4563                          (intern
4564                           (format "gnus-%s-mode-line-format-spec" where))))
4565                (gnus-tmp-group-name (gnus-group-name-decode
4566                                      gnus-newsgroup-name
4567                                      (gnus-group-name-charset
4568                                       nil
4569                                       gnus-newsgroup-name)))
4570                (gnus-tmp-article-number (or gnus-current-article 0))
4571                (gnus-tmp-unread gnus-newsgroup-unreads)
4572                (gnus-tmp-unread-and-unticked (length gnus-newsgroup-unreads))
4573                (gnus-tmp-unselected (length gnus-newsgroup-unselected))
4574                (gnus-tmp-unread-and-unselected
4575                 (cond ((and (zerop gnus-tmp-unread-and-unticked)
4576                             (zerop gnus-tmp-unselected))
4577                        "")
4578                       ((zerop gnus-tmp-unselected)
4579                        (format "{%d more}" gnus-tmp-unread-and-unticked))
4580                       (t (format "{%d(+%d) more}"
4581                                  gnus-tmp-unread-and-unticked
4582                                  gnus-tmp-unselected))))
4583                (gnus-tmp-subject
4584                 (if (and gnus-current-headers
4585                          (vectorp gnus-current-headers))
4586                     (gnus-mode-string-quote
4587                      (mail-header-subject gnus-current-headers))
4588                   ""))
4589                bufname-length max-len
4590                gnus-tmp-header);; passed as argument to any user-format-funcs
4591           (setq mode-string (eval mformat))
4592           (setq bufname-length (if (string-match "%b" mode-string)
4593                                    (- (length
4594                                        (buffer-name
4595                                         (if (eq where 'summary)
4596                                             nil
4597                                           (get-buffer gnus-article-buffer))))
4598                                       2)
4599                                  0))
4600           (setq max-len (max 4 (if gnus-mode-non-string-length
4601                                    (- (window-width)
4602                                       gnus-mode-non-string-length
4603                                       bufname-length)
4604                                  (length mode-string))))
4605           ;; We might have to chop a bit of the string off...
4606           (when (> (length mode-string) max-len)
4607             (setq mode-string
4608                   (concat (truncate-string-to-width mode-string (- max-len 3))
4609                           "...")))
4610           ;; Pad the mode string a bit.
4611           (setq mode-string (format (format "%%-%ds" max-len) mode-string))))
4612       ;; Update the mode line.
4613       (setq mode-line-buffer-identification
4614             (gnus-mode-line-buffer-identification (list mode-string)))
4615       (set-buffer-modified-p t))))
4616
4617 (defun gnus-create-xref-hashtb (from-newsgroup headers unreads)
4618   "Go through the HEADERS list and add all Xrefs to a hash table.
4619 The resulting hash table is returned, or nil if no Xrefs were found."
4620   (let* ((virtual (gnus-virtual-group-p from-newsgroup))
4621          (prefix (if virtual "" (gnus-group-real-prefix from-newsgroup)))
4622          (xref-hashtb (gnus-make-hashtable))
4623          start group entry number xrefs header)
4624     (while headers
4625       (setq header (pop headers))
4626       (when (and (setq xrefs (mail-header-xref header))
4627                  (not (memq (setq number (mail-header-number header))
4628                             unreads)))
4629         (setq start 0)
4630         (while (string-match "\\([^ ]+\\)[:/]\\([0-9]+\\)" xrefs start)
4631           (setq start (match-end 0))
4632           (setq group (if prefix
4633                           (concat prefix (substring xrefs (match-beginning 1)
4634                                                     (match-end 1)))
4635                         (substring xrefs (match-beginning 1) (match-end 1))))
4636           (setq number
4637                 (string-to-int (substring xrefs (match-beginning 2)
4638                                           (match-end 2))))
4639           (if (setq entry (gnus-gethash group xref-hashtb))
4640               (setcdr entry (cons number (cdr entry)))
4641             (gnus-sethash group (cons number nil) xref-hashtb)))))
4642     (and start xref-hashtb)))
4643
4644 (defun gnus-mark-xrefs-as-read (from-newsgroup headers unreads)
4645   "Look through all the headers and mark the Xrefs as read."
4646   (let ((virtual (gnus-virtual-group-p from-newsgroup))
4647         name entry info xref-hashtb idlist method nth4)
4648     (save-excursion
4649       (set-buffer gnus-group-buffer)
4650       (when (setq xref-hashtb
4651                   (gnus-create-xref-hashtb from-newsgroup headers unreads))
4652         (mapatoms
4653          (lambda (group)
4654            (unless (string= from-newsgroup (setq name (symbol-name group)))
4655              (setq idlist (symbol-value group))
4656              ;; Dead groups are not updated.
4657              (and (prog1
4658                       (setq entry (gnus-gethash name gnus-newsrc-hashtb)
4659                             info (nth 2 entry))
4660                     (when (stringp (setq nth4 (gnus-info-method info)))
4661                       (setq nth4 (gnus-server-to-method nth4))))
4662                   ;; Only do the xrefs if the group has the same
4663                   ;; select method as the group we have just read.
4664                   (or (gnus-methods-equal-p
4665                        nth4 (gnus-find-method-for-group from-newsgroup))
4666                       virtual
4667                       (equal nth4 (setq method (gnus-find-method-for-group
4668                                                 from-newsgroup)))
4669                       (and (equal (car nth4) (car method))
4670                            (equal (nth 1 nth4) (nth 1 method))))
4671                   gnus-use-cross-reference
4672                   (or (not (eq gnus-use-cross-reference t))
4673                       virtual
4674                       ;; Only do cross-references on subscribed
4675                       ;; groups, if that is what is wanted.
4676                       (<= (gnus-info-level info) gnus-level-subscribed))
4677                   (gnus-group-make-articles-read name idlist))))
4678          xref-hashtb)))))
4679
4680 (defun gnus-compute-read-articles (group articles)
4681   (let* ((entry (gnus-gethash group gnus-newsrc-hashtb))
4682          (info (nth 2 entry))
4683          (active (gnus-active group))
4684          ninfo)
4685     (when entry
4686       ;; First peel off all invalid article numbers.
4687       (when active
4688         (let ((ids articles)
4689               id first)
4690           (while (setq id (pop ids))
4691             (when (and first (> id (cdr active)))
4692               ;; We'll end up in this situation in one particular
4693               ;; obscure situation.  If you re-scan a group and get
4694               ;; a new article that is cross-posted to a different
4695               ;; group that has not been re-scanned, you might get
4696               ;; crossposted article that has a higher number than
4697               ;; Gnus believes possible.  So we re-activate this
4698               ;; group as well.  This might mean doing the
4699               ;; crossposting thingy will *increase* the number
4700               ;; of articles in some groups.  Tsk, tsk.
4701               (setq active (or (gnus-activate-group group) active)))
4702             (when (or (> id (cdr active))
4703                       (< id (car active)))
4704               (setq articles (delq id articles))))))
4705       ;; If the read list is nil, we init it.
4706       (if (and active
4707                (null (gnus-info-read info))
4708                (> (car active) 1))
4709           (setq ninfo (cons 1 (1- (car active))))
4710         (setq ninfo (gnus-info-read info)))
4711       ;; Then we add the read articles to the range.
4712       (gnus-add-to-range
4713        ninfo (setq articles (sort articles '<))))))
4714
4715 (defun gnus-group-make-articles-read (group articles)
4716   "Update the info of GROUP to say that ARTICLES are read."
4717   (let* ((num 0)
4718          (entry (gnus-gethash group gnus-newsrc-hashtb))
4719          (info (nth 2 entry))
4720          (active (gnus-active group))
4721          range)
4722     (when entry
4723       (setq range (gnus-compute-read-articles group articles))
4724       (save-excursion
4725         (set-buffer gnus-group-buffer)
4726         (gnus-undo-register
4727           `(progn
4728              (gnus-info-set-marks ',info ',(gnus-info-marks info) t)
4729              (gnus-info-set-read ',info ',(gnus-info-read info))
4730              (gnus-get-unread-articles-in-group ',info (gnus-active ,group))
4731              (gnus-group-update-group ,group t))))
4732       ;; Add the read articles to the range.
4733       (gnus-info-set-read info range)
4734       ;; Then we have to re-compute how many unread
4735       ;; articles there are in this group.
4736       (when active
4737         (cond
4738          ((not range)
4739           (setq num (- (1+ (cdr active)) (car active))))
4740          ((not (listp (cdr range)))
4741           (setq num (- (cdr active) (- (1+ (cdr range))
4742                                        (car range)))))
4743          (t
4744           (while range
4745             (if (numberp (car range))
4746                 (setq num (1+ num))
4747               (setq num (+ num (- (1+ (cdar range)) (caar range)))))
4748             (setq range (cdr range)))
4749           (setq num (- (cdr active) num))))
4750         ;; Update the number of unread articles.
4751         (setcar entry num)
4752         ;; Update the group buffer.
4753         (gnus-group-update-group group t)))))
4754
4755 (defvar gnus-newsgroup-none-id 0)
4756
4757 (defun gnus-get-newsgroup-headers (&optional dependencies force-new)
4758   (let ((cur nntp-server-buffer)
4759         (dependencies
4760          (or dependencies
4761              (save-excursion (set-buffer gnus-summary-buffer)
4762                              gnus-newsgroup-dependencies)))
4763         headers id end ref
4764         (mail-parse-charset gnus-newsgroup-charset)
4765         (mail-parse-ignored-charsets
4766          (save-excursion (condition-case nil
4767                              (set-buffer gnus-summary-buffer)
4768                            (error))
4769                          gnus-newsgroup-ignored-charsets)))
4770     (save-excursion
4771       (set-buffer nntp-server-buffer)
4772       ;; Translate all TAB characters into SPACE characters.
4773       (subst-char-in-region (point-min) (point-max) ?\t ?  t)
4774       (subst-char-in-region (point-min) (point-max) ?\r ?  t)
4775       (gnus-run-hooks 'gnus-parse-headers-hook)
4776       (let ((case-fold-search t)
4777             in-reply-to header p lines chars)
4778         (goto-char (point-min))
4779         ;; Search to the beginning of the next header.  Error messages
4780         ;; do not begin with 2 or 3.
4781         (while (re-search-forward "^[23][0-9]+ " nil t)
4782           (setq id nil
4783                 ref nil)
4784           ;; This implementation of this function, with nine
4785           ;; search-forwards instead of the one re-search-forward and
4786           ;; a case (which basically was the old function) is actually
4787           ;; about twice as fast, even though it looks messier.  You
4788           ;; can't have everything, I guess.  Speed and elegance
4789           ;; doesn't always go hand in hand.
4790           (setq
4791            header
4792            (vector
4793             ;; Number.
4794             (prog1
4795                 (read cur)
4796               (end-of-line)
4797               (setq p (point))
4798               (narrow-to-region (point)
4799                                 (or (and (search-forward "\n.\n" nil t)
4800                                          (- (point) 2))
4801                                     (point))))
4802             ;; Subject.
4803             (progn
4804               (goto-char p)
4805               (if (search-forward "\nsubject: " nil t)
4806                   (funcall gnus-decode-encoded-word-function
4807                            (nnheader-header-value))
4808                 "(none)"))
4809             ;; From.
4810             (progn
4811               (goto-char p)
4812               (if (or (search-forward "\nfrom: " nil t)
4813                       (search-forward "\nfrom:" nil t))
4814                   (funcall gnus-decode-encoded-word-function
4815                            (nnheader-header-value))
4816                 "(nobody)"))
4817             ;; Date.
4818             (progn
4819               (goto-char p)
4820               (if (search-forward "\ndate: " nil t)
4821                   (nnheader-header-value) ""))
4822             ;; Message-ID.
4823             (progn
4824               (goto-char p)
4825               (setq id (if (re-search-forward
4826                             "^message-id: *\\(<[^\n\t> ]+>\\)" nil t)
4827                            ;; We do it this way to make sure the Message-ID
4828                            ;; is (somewhat) syntactically valid.
4829                            (buffer-substring (match-beginning 1)
4830                                              (match-end 1))
4831                          ;; If there was no message-id, we just fake one
4832                          ;; to make subsequent routines simpler.
4833                          (nnheader-generate-fake-message-id))))
4834             ;; References.
4835             (progn
4836               (goto-char p)
4837               (if (search-forward "\nreferences: " nil t)
4838                   (progn
4839                     (setq end (point))
4840                     (prog1
4841                         (nnheader-header-value)
4842                       (setq ref
4843                             (buffer-substring
4844                              (progn
4845                                (end-of-line)
4846                                (search-backward ">" end t)
4847                                (1+ (point)))
4848                              (progn
4849                                (search-backward "<" end t)
4850                                (point))))))
4851                 ;; Get the references from the in-reply-to header if there
4852                 ;; were no references and the in-reply-to header looks
4853                 ;; promising.
4854                 (if (and (search-forward "\nin-reply-to: " nil t)
4855                          (setq in-reply-to (nnheader-header-value))
4856                          (string-match "<[^>]+>" in-reply-to))
4857                     (let (ref2)
4858                       (setq ref (substring in-reply-to (match-beginning 0)
4859                                            (match-end 0)))
4860                       (while (string-match "<[^>]+>" in-reply-to (match-end 0))
4861                         (setq ref2 (substring in-reply-to (match-beginning 0)
4862                                               (match-end 0)))
4863                         (when (> (length ref2) (length ref))
4864                           (setq ref ref2)))
4865                       ref)
4866                   (setq ref nil))))
4867             ;; Chars.
4868             (progn
4869               (goto-char p)
4870               (if (search-forward "\nchars: " nil t)
4871                   (if (numberp (setq chars (ignore-errors (read cur))))
4872                       chars 0)
4873                 0))
4874             ;; Lines.
4875             (progn
4876               (goto-char p)
4877               (if (search-forward "\nlines: " nil t)
4878                   (if (numberp (setq lines (ignore-errors (read cur))))
4879                       lines 0)
4880                 0))
4881             ;; Xref.
4882             (progn
4883               (goto-char p)
4884               (and (search-forward "\nxref: " nil t)
4885                    (nnheader-header-value)))
4886             ;; Extra.
4887             (when gnus-extra-headers
4888               (let ((extra gnus-extra-headers)
4889                     out)
4890                 (while extra
4891                   (goto-char p)
4892                   (when (search-forward
4893                          (concat "\n" (symbol-name (car extra)) ": ") nil t)
4894                     (push (cons (car extra) (nnheader-header-value))
4895                           out))
4896                   (pop extra))
4897                 out))))
4898           (when (equal id ref)
4899             (setq ref nil))
4900
4901           (when gnus-alter-header-function
4902             (funcall gnus-alter-header-function header)
4903             (setq id (mail-header-id header)
4904                   ref (gnus-parent-id (mail-header-references header))))
4905
4906           (when (setq header
4907                       (gnus-dependencies-add-header
4908                        header dependencies force-new))
4909             (push header headers))
4910           (goto-char (point-max))
4911           (widen))
4912         (nreverse headers)))))
4913
4914 ;; Goes through the xover lines and returns a list of vectors
4915 (defun gnus-get-newsgroup-headers-xover (sequence &optional
4916                                                   force-new dependencies
4917                                                   group also-fetch-heads)
4918   "Parse the news overview data in the server buffer.
4919 Return a list of headers that match SEQUENCE (see
4920 `nntp-retrieve-headers')."
4921   ;; Get the Xref when the users reads the articles since most/some
4922   ;; NNTP servers do not include Xrefs when using XOVER.
4923   (setq gnus-article-internal-prepare-hook '(gnus-article-get-xrefs))
4924   (let ((mail-parse-charset gnus-newsgroup-charset)
4925         (mail-parse-ignored-charsets gnus-newsgroup-ignored-charsets)
4926         (cur nntp-server-buffer)
4927         (dependencies (or dependencies gnus-newsgroup-dependencies))
4928         number headers header)
4929     (save-excursion
4930       (set-buffer nntp-server-buffer)
4931       (subst-char-in-region (point-min) (point-max) ?\r ?  t)
4932       ;; Allow the user to mangle the headers before parsing them.
4933       (gnus-run-hooks 'gnus-parse-headers-hook)
4934       (goto-char (point-min))
4935       (while (not (eobp))
4936         (condition-case ()
4937             (while (and sequence (not (eobp)))
4938               (setq number (read cur))
4939               (while (and sequence
4940                           (< (car sequence) number))
4941                 (setq sequence (cdr sequence)))
4942               (and sequence
4943                    (eq number (car sequence))
4944                    (progn
4945                      (setq sequence (cdr sequence))
4946                      (setq header (inline
4947                                     (gnus-nov-parse-line
4948                                      number dependencies force-new))))
4949                    (push header headers))
4950               (forward-line 1))
4951           (error
4952            (gnus-error 4 "Strange nov line (%d)"
4953                        (count-lines (point-min) (point)))))
4954         (forward-line 1))
4955       ;; A common bug in inn is that if you have posted an article and
4956       ;; then retrieves the active file, it will answer correctly --
4957       ;; the new article is included.  However, a NOV entry for the
4958       ;; article may not have been generated yet, so this may fail.
4959       ;; We work around this problem by retrieving the last few
4960       ;; headers using HEAD.
4961       (if (or (not also-fetch-heads)
4962               (not sequence))
4963           ;; We (probably) got all the headers.
4964           (nreverse headers)
4965         (let ((gnus-nov-is-evil t))
4966           (nconc
4967            (nreverse headers)
4968            (when (gnus-retrieve-headers sequence group)
4969              (gnus-get-newsgroup-headers))))))))
4970
4971 (defun gnus-article-get-xrefs ()
4972   "Fill in the Xref value in `gnus-current-headers', if necessary.
4973 This is meant to be called in `gnus-article-internal-prepare-hook'."
4974   (let ((headers (save-excursion (set-buffer gnus-summary-buffer)
4975                                  gnus-current-headers)))
4976     (or (not gnus-use-cross-reference)
4977         (not headers)
4978         (and (mail-header-xref headers)
4979              (not (string= (mail-header-xref headers) "")))
4980         (let ((case-fold-search t)
4981               xref)
4982           (save-restriction
4983             (nnheader-narrow-to-headers)
4984             (goto-char (point-min))
4985             (when (or (and (not (eobp))
4986                            (eq (downcase (char-after)) ?x)
4987                            (looking-at "Xref:"))
4988                       (search-forward "\nXref:" nil t))
4989               (goto-char (1+ (match-end 0)))
4990               (setq xref (buffer-substring (point)
4991                                            (progn (end-of-line) (point))))
4992               (mail-header-set-xref headers xref)))))))
4993
4994 (defun gnus-summary-insert-subject (id &optional old-header use-old-header)
4995   "Find article ID and insert the summary line for that article.
4996 OLD-HEADER can either be a header or a line number to insert
4997 the subject line on."
4998   (let* ((line (and (numberp old-header) old-header))
4999          (old-header (and (vectorp old-header) old-header))
5000          (header (cond ((and old-header use-old-header)
5001                         old-header)
5002                        ((and (numberp id)
5003                              (gnus-number-to-header id))
5004                         (gnus-number-to-header id))
5005                        (t
5006                         (gnus-read-header id))))
5007          (number (and (numberp id) id))
5008          d)
5009     (when header
5010       ;; Rebuild the thread that this article is part of and go to the
5011       ;; article we have fetched.
5012       (when (and (not gnus-show-threads)
5013                  old-header)
5014         (when (and number
5015                    (setq d (gnus-data-find (mail-header-number old-header))))
5016           (goto-char (gnus-data-pos d))
5017           (gnus-data-remove
5018            number
5019            (- (gnus-point-at-bol)
5020               (prog1
5021                   (1+ (gnus-point-at-eol))
5022                 (gnus-delete-line))))))
5023       (when old-header
5024         (mail-header-set-number header (mail-header-number old-header)))
5025       (setq gnus-newsgroup-sparse
5026             (delq (setq number (mail-header-number header))
5027                   gnus-newsgroup-sparse))
5028       (setq gnus-newsgroup-ancient (delq number gnus-newsgroup-ancient))
5029       (push number gnus-newsgroup-limit)
5030       (gnus-rebuild-thread (mail-header-id header) line)
5031       (gnus-summary-goto-subject number nil t))
5032     (when (and (numberp number)
5033                (> number 0))
5034       ;; We have to update the boundaries even if we can't fetch the
5035       ;; article if ID is a number -- so that the next `P' or `N'
5036       ;; command will fetch the previous (or next) article even
5037       ;; if the one we tried to fetch this time has been canceled.
5038       (when (> number gnus-newsgroup-end)
5039         (setq gnus-newsgroup-end number))
5040       (when (< number gnus-newsgroup-begin)
5041         (setq gnus-newsgroup-begin number))
5042       (setq gnus-newsgroup-unselected
5043             (delq number gnus-newsgroup-unselected)))
5044     ;; Report back a success?
5045     (and header (mail-header-number header))))
5046
5047 ;;; Process/prefix in the summary buffer
5048
5049 (defun gnus-summary-work-articles (n)
5050   "Return a list of articles to be worked upon.
5051 The prefix argument, the list of process marked articles, and the
5052 current article will be taken into consideration."
5053   (save-excursion
5054     (set-buffer gnus-summary-buffer)
5055     (cond
5056      (n
5057       ;; A numerical prefix has been given.
5058       (setq n (prefix-numeric-value n))
5059       (let ((backward (< n 0))
5060             (n (abs (prefix-numeric-value n)))
5061             articles article)
5062         (save-excursion
5063           (while
5064               (and (> n 0)
5065                    (push (setq article (gnus-summary-article-number))
5066                          articles)
5067                    (if backward
5068                        (gnus-summary-find-prev nil article)
5069                      (gnus-summary-find-next nil article)))
5070             (decf n)))
5071         (nreverse articles)))
5072      ((and (gnus-region-active-p) (mark))
5073       (message "region active")
5074       ;; Work on the region between point and mark.
5075       (let ((max (max (point) (mark)))
5076             articles article)
5077         (save-excursion
5078           (goto-char (min (min (point) (mark))))
5079           (while
5080               (and
5081                (push (setq article (gnus-summary-article-number)) articles)
5082                (gnus-summary-find-next nil article)
5083                (< (point) max)))
5084           (nreverse articles))))
5085      (gnus-newsgroup-processable
5086       ;; There are process-marked articles present.
5087       ;; Save current state.
5088       (gnus-summary-save-process-mark)
5089       ;; Return the list.
5090       (reverse gnus-newsgroup-processable))
5091      (t
5092       ;; Just return the current article.
5093       (list (gnus-summary-article-number))))))
5094
5095 (defmacro gnus-summary-iterate (arg &rest forms)
5096   "Iterate over the process/prefixed articles and do FORMS.
5097 ARG is the interactive prefix given to the command.  FORMS will be
5098 executed with point over the summary line of the articles."
5099   (let ((articles (make-symbol "gnus-summary-iterate-articles")))
5100     `(let ((,articles (gnus-summary-work-articles ,arg)))
5101        (while ,articles
5102          (gnus-summary-goto-subject (car ,articles))
5103          ,@forms
5104          (pop ,articles)))))
5105
5106 (put 'gnus-summary-iterate 'lisp-indent-function 1)
5107 (put 'gnus-summary-iterate 'edebug-form-spec '(form body))
5108
5109 (defun gnus-summary-save-process-mark ()
5110   "Push the current set of process marked articles on the stack."
5111   (interactive)
5112   (push (copy-sequence gnus-newsgroup-processable)
5113         gnus-newsgroup-process-stack))
5114
5115 (defun gnus-summary-kill-process-mark ()
5116   "Push the current set of process marked articles on the stack and unmark."
5117   (interactive)
5118   (gnus-summary-save-process-mark)
5119   (gnus-summary-unmark-all-processable))
5120
5121 (defun gnus-summary-yank-process-mark ()
5122   "Pop the last process mark state off the stack and restore it."
5123   (interactive)
5124   (unless gnus-newsgroup-process-stack
5125     (error "Empty mark stack"))
5126   (gnus-summary-process-mark-set (pop gnus-newsgroup-process-stack)))
5127
5128 (defun gnus-summary-process-mark-set (set)
5129   "Make SET into the current process marked articles."
5130   (gnus-summary-unmark-all-processable)
5131   (while set
5132     (gnus-summary-set-process-mark (pop set))))
5133
5134 ;;; Searching and stuff
5135
5136 (defun gnus-summary-search-group (&optional backward use-level)
5137   "Search for next unread newsgroup.
5138 If optional argument BACKWARD is non-nil, search backward instead."
5139   (save-excursion
5140     (set-buffer gnus-group-buffer)
5141     (when (gnus-group-search-forward
5142            backward nil (if use-level (gnus-group-group-level) nil))
5143       (gnus-group-group-name))))
5144
5145 (defun gnus-summary-best-group (&optional exclude-group)
5146   "Find the name of the best unread group.
5147 If EXCLUDE-GROUP, do not go to this group."
5148   (save-excursion
5149     (set-buffer gnus-group-buffer)
5150     (save-excursion
5151       (gnus-group-best-unread-group exclude-group))))
5152
5153 (defun gnus-summary-find-next (&optional unread article backward undownloaded)
5154   (if backward (gnus-summary-find-prev)
5155     (let* ((dummy (gnus-summary-article-intangible-p))
5156            (article (or article (gnus-summary-article-number)))
5157            (arts (gnus-data-find-list article))
5158            result)
5159       (when (and (not dummy)
5160                  (or (not gnus-summary-check-current)
5161                      (not unread)
5162                      (not (gnus-data-unread-p (car arts)))))
5163         (setq arts (cdr arts)))
5164       (when (setq result
5165                   (if unread
5166                       (progn
5167                         (while arts
5168                           (when (or (and undownloaded
5169                                          (eq gnus-undownloaded-mark
5170                                              (gnus-data-mark (car arts))))
5171                                     (gnus-data-unread-p (car arts)))
5172                             (setq result (car arts)
5173                                   arts nil))
5174                           (setq arts (cdr arts)))
5175                         result)
5176                     (car arts)))
5177         (goto-char (gnus-data-pos result))
5178         (gnus-data-number result)))))
5179
5180 (defun gnus-summary-find-prev (&optional unread article)
5181   (let* ((eobp (eobp))
5182          (article (or article (gnus-summary-article-number)))
5183          (arts (gnus-data-find-list article (gnus-data-list 'rev)))
5184          result)
5185     (when (and (not eobp)
5186                (or (not gnus-summary-check-current)
5187                    (not unread)
5188                    (not (gnus-data-unread-p (car arts)))))
5189       (setq arts (cdr arts)))
5190     (when (setq result
5191                 (if unread
5192                     (progn
5193                       (while arts
5194                         (when (gnus-data-unread-p (car arts))
5195                           (setq result (car arts)
5196                                 arts nil))
5197                         (setq arts (cdr arts)))
5198                       result)
5199                   (car arts)))
5200       (goto-char (gnus-data-pos result))
5201       (gnus-data-number result))))
5202
5203 (defun gnus-summary-find-subject (subject &optional unread backward article)
5204   (let* ((simp-subject (gnus-simplify-subject-fully subject))
5205          (article (or article (gnus-summary-article-number)))
5206          (articles (gnus-data-list backward))
5207          (arts (gnus-data-find-list article articles))
5208          result)
5209     (when (or (not gnus-summary-check-current)
5210               (not unread)
5211               (not (gnus-data-unread-p (car arts))))
5212       (setq arts (cdr arts)))
5213     (while arts
5214       (and (or (not unread)
5215                (gnus-data-unread-p (car arts)))
5216            (vectorp (gnus-data-header (car arts)))
5217            (gnus-subject-equal
5218             simp-subject (mail-header-subject (gnus-data-header (car arts))) t)
5219            (setq result (car arts)
5220                  arts nil))
5221       (setq arts (cdr arts)))
5222     (and result
5223          (goto-char (gnus-data-pos result))
5224          (gnus-data-number result))))
5225
5226 (defun gnus-summary-search-forward (&optional unread subject backward)
5227   "Search forward for an article.
5228 If UNREAD, look for unread articles.  If SUBJECT, look for
5229 articles with that subject.  If BACKWARD, search backward instead."
5230   (cond (subject (gnus-summary-find-subject subject unread backward))
5231         (backward (gnus-summary-find-prev unread))
5232         (t (gnus-summary-find-next unread))))
5233
5234 (defun gnus-recenter (&optional n)
5235   "Center point in window and redisplay frame.
5236 Also do horizontal recentering."
5237   (interactive "P")
5238   (when (and gnus-auto-center-summary
5239              (not (eq gnus-auto-center-summary 'vertical)))
5240     (gnus-horizontal-recenter))
5241   (recenter n))
5242
5243 (defun gnus-summary-recenter ()
5244   "Center point in the summary window.
5245 If `gnus-auto-center-summary' is nil, or the article buffer isn't
5246 displayed, no centering will be performed."
5247   ;; Suggested by earle@mahendo.JPL.NASA.GOV (Greg Earle).
5248   ;; Recenter only when requested.  Suggested by popovich@park.cs.columbia.edu.
5249   (interactive)
5250   (let* ((top (cond ((< (window-height) 4) 0)
5251                     ((< (window-height) 7) 1)
5252                     (t (if (numberp gnus-auto-center-summary)
5253                            gnus-auto-center-summary
5254                          2))))
5255          (height (1- (window-height)))
5256          (bottom (save-excursion (goto-char (point-max))
5257                                  (forward-line (- height))
5258                                  (point)))
5259          (window (get-buffer-window (current-buffer))))
5260     ;; The user has to want it.
5261     (when gnus-auto-center-summary
5262       (when (get-buffer-window gnus-article-buffer)
5263         ;; Only do recentering when the article buffer is displayed,
5264         ;; Set the window start to either `bottom', which is the biggest
5265         ;; possible valid number, or the second line from the top,
5266         ;; whichever is the least.
5267         (set-window-start
5268          window (min bottom (save-excursion
5269                               (forward-line (- top)) (point)))
5270          t))
5271       ;; Do horizontal recentering while we're at it.
5272       (when (and (get-buffer-window (current-buffer) t)
5273                  (not (eq gnus-auto-center-summary 'vertical)))
5274         (let ((selected (selected-window)))
5275           (select-window (get-buffer-window (current-buffer) t))
5276           (gnus-summary-position-point)
5277           (gnus-horizontal-recenter)
5278           (select-window selected))))))
5279
5280 (defun gnus-summary-jump-to-group (newsgroup)
5281   "Move point to NEWSGROUP in group mode buffer."
5282   ;; Keep update point of group mode buffer if visible.
5283   (if (eq (current-buffer) (get-buffer gnus-group-buffer))
5284       (save-window-excursion
5285         ;; Take care of tree window mode.
5286         (when (get-buffer-window gnus-group-buffer)
5287           (pop-to-buffer gnus-group-buffer))
5288         (gnus-group-jump-to-group newsgroup))
5289     (save-excursion
5290       ;; Take care of tree window mode.
5291       (if (get-buffer-window gnus-group-buffer)
5292           (pop-to-buffer gnus-group-buffer)
5293         (set-buffer gnus-group-buffer))
5294       (gnus-group-jump-to-group newsgroup))))
5295
5296 ;; This function returns a list of article numbers based on the
5297 ;; difference between the ranges of read articles in this group and
5298 ;; the range of active articles.
5299 (defun gnus-list-of-unread-articles (group)
5300   (let* ((read (gnus-info-read (gnus-get-info group)))
5301          (active (or (gnus-active group) (gnus-activate-group group)))
5302          (last (cdr active))
5303          first nlast unread)
5304     ;; If none are read, then all are unread.
5305     (if (not read)
5306         (setq first (car active))
5307       ;; If the range of read articles is a single range, then the
5308       ;; first unread article is the article after the last read
5309       ;; article.  Sounds logical, doesn't it?
5310       (if (and (not (listp (cdr read)))
5311                (or (< (car read) (car active))
5312                    (progn (setq read (list read))
5313                           nil)))
5314           (setq first (max (car active) (1+ (cdr read))))
5315         ;; `read' is a list of ranges.
5316         (when (/= (setq nlast (or (and (numberp (car read)) (car read))
5317                                   (caar read)))
5318                   1)
5319           (setq first (car active)))
5320         (while read
5321           (when first
5322             (while (< first nlast)
5323               (push first unread)
5324               (setq first (1+ first))))
5325           (setq first (1+ (if (atom (car read)) (car read) (cdar read))))
5326           (setq nlast (if (atom (cadr read)) (cadr read) (caadr read)))
5327           (setq read (cdr read)))))
5328     ;; And add the last unread articles.
5329     (while (<= first last)
5330       (push first unread)
5331       (setq first (1+ first)))
5332     ;; Return the list of unread articles.
5333     (delq 0 (nreverse unread))))
5334
5335 (defun gnus-list-of-read-articles (group)
5336   "Return a list of unread, unticked and non-dormant articles."
5337   (let* ((info (gnus-get-info group))
5338          (marked (gnus-info-marks info))
5339          (active (gnus-active group)))
5340     (and info active
5341          (gnus-set-difference
5342           (gnus-sorted-complement
5343            (gnus-uncompress-range active)
5344            (gnus-list-of-unread-articles group))
5345           (append
5346            (gnus-uncompress-range (cdr (assq 'dormant marked)))
5347            (gnus-uncompress-range (cdr (assq 'tick marked))))))))
5348
5349 ;; Various summary commands
5350
5351 (defun gnus-summary-select-article-buffer ()
5352   "Reconfigure windows to show article buffer."
5353   (interactive)
5354   (if (not (gnus-buffer-live-p gnus-article-buffer))
5355       (error "There is no article buffer for this summary buffer")
5356     (gnus-configure-windows 'article)
5357     (select-window (get-buffer-window gnus-article-buffer))))
5358
5359 (defun gnus-summary-universal-argument (arg)
5360   "Perform any operation on all articles that are process/prefixed."
5361   (interactive "P")
5362   (let ((articles (gnus-summary-work-articles arg))
5363         func article)
5364     (if (eq
5365          (setq
5366           func
5367           (key-binding
5368            (read-key-sequence
5369             (substitute-command-keys
5370              "\\<gnus-summary-mode-map>\\[gnus-summary-universal-argument]"))))
5371          'undefined)
5372         (gnus-error 1 "Undefined key")
5373       (save-excursion
5374         (while articles
5375           (gnus-summary-goto-subject (setq article (pop articles)))
5376           (let (gnus-newsgroup-processable)
5377             (command-execute func))
5378           (gnus-summary-remove-process-mark article)))))
5379   (gnus-summary-position-point))
5380
5381 (defun gnus-summary-toggle-truncation (&optional arg)
5382   "Toggle truncation of summary lines.
5383 With arg, turn line truncation on iff arg is positive."
5384   (interactive "P")
5385   (setq truncate-lines
5386         (if (null arg) (not truncate-lines)
5387           (> (prefix-numeric-value arg) 0)))
5388   (redraw-display))
5389
5390 (defun gnus-summary-reselect-current-group (&optional all rescan)
5391   "Exit and then reselect the current newsgroup.
5392 The prefix argument ALL means to select all articles."
5393   (interactive "P")
5394   (when (gnus-ephemeral-group-p gnus-newsgroup-name)
5395     (error "Ephemeral groups can't be reselected"))
5396   (let ((current-subject (gnus-summary-article-number))
5397         (group gnus-newsgroup-name))
5398     (setq gnus-newsgroup-begin nil)
5399     (gnus-summary-exit)
5400     ;; We have to adjust the point of group mode buffer because
5401     ;; point was moved to the next unread newsgroup by exiting.
5402     (gnus-summary-jump-to-group group)
5403     (when rescan
5404       (save-excursion
5405         (gnus-group-get-new-news-this-group 1)))
5406     (gnus-group-read-group all t)
5407     (gnus-summary-goto-subject current-subject nil t)))
5408
5409 (defun gnus-summary-rescan-group (&optional all)
5410   "Exit the newsgroup, ask for new articles, and select the newsgroup."
5411   (interactive "P")
5412   (gnus-summary-reselect-current-group all t))
5413
5414 (defun gnus-summary-update-info (&optional non-destructive)
5415   (save-excursion
5416     (let ((group gnus-newsgroup-name))
5417       (when group
5418         (when gnus-newsgroup-kill-headers
5419           (setq gnus-newsgroup-killed
5420                 (gnus-compress-sequence
5421                  (nconc
5422                   (gnus-set-sorted-intersection
5423                    (gnus-uncompress-range gnus-newsgroup-killed)
5424                    (setq gnus-newsgroup-unselected
5425                          (sort gnus-newsgroup-unselected '<)))
5426                   (setq gnus-newsgroup-unreads
5427                         (sort gnus-newsgroup-unreads '<)))
5428                  t)))
5429         (unless (listp (cdr gnus-newsgroup-killed))
5430           (setq gnus-newsgroup-killed (list gnus-newsgroup-killed)))
5431         (let ((headers gnus-newsgroup-headers))
5432           ;; Set the new ranges of read articles.
5433           (save-excursion
5434             (set-buffer gnus-group-buffer)
5435             (gnus-undo-force-boundary))
5436           (gnus-update-read-articles
5437            group (append gnus-newsgroup-unreads gnus-newsgroup-unselected))
5438           ;; Set the current article marks.
5439           (let ((gnus-newsgroup-scored
5440                  (if (and (not gnus-save-score)
5441                           (not non-destructive))
5442                      nil
5443                    gnus-newsgroup-scored)))
5444             (save-excursion
5445               (gnus-update-marks)))
5446           ;; Do the cross-ref thing.
5447           (when gnus-use-cross-reference
5448             (gnus-mark-xrefs-as-read group headers gnus-newsgroup-unreads))
5449           ;; Do not switch windows but change the buffer to work.
5450           (set-buffer gnus-group-buffer)
5451           (unless (gnus-ephemeral-group-p group)
5452             (gnus-group-update-group group)))))))
5453
5454 (defun gnus-summary-save-newsrc (&optional force)
5455   "Save the current number of read/marked articles in the dribble buffer.
5456 The dribble buffer will then be saved.
5457 If FORCE (the prefix), also save the .newsrc file(s)."
5458   (interactive "P")
5459   (gnus-summary-update-info t)
5460   (if force
5461       (gnus-save-newsrc-file)
5462     (gnus-dribble-save)))
5463
5464 (defun gnus-summary-exit (&optional temporary)
5465   "Exit reading current newsgroup, and then return to group selection mode.
5466 `gnus-exit-group-hook' is called with no arguments if that value is non-nil."
5467   (interactive)
5468   (gnus-set-global-variables)
5469   (when (gnus-buffer-live-p gnus-article-buffer)
5470     (save-excursion
5471       (set-buffer gnus-article-buffer)
5472       (mm-destroy-parts gnus-article-mime-handles)
5473       ;; Set it to nil for safety reason.
5474       (setq gnus-article-mime-handle-alist nil)
5475       (setq gnus-article-mime-handles nil)))
5476   (gnus-kill-save-kill-buffer)
5477   (gnus-async-halt-prefetch)
5478   (let* ((group gnus-newsgroup-name)
5479          (quit-config (gnus-group-quit-config gnus-newsgroup-name))
5480          (mode major-mode)
5481          (group-point nil)
5482          (buf (current-buffer)))
5483     (unless quit-config
5484       ;; Do adaptive scoring, and possibly save score files.
5485       (when gnus-newsgroup-adaptive
5486         (gnus-score-adaptive))
5487       (when gnus-use-scoring
5488         (gnus-score-save)))
5489     (gnus-run-hooks 'gnus-summary-prepare-exit-hook)
5490     ;; If we have several article buffers, we kill them at exit.
5491     (unless gnus-single-article-buffer
5492       (gnus-kill-buffer gnus-original-article-buffer)
5493       (setq gnus-article-current nil))
5494     (when gnus-use-cache
5495       (gnus-cache-possibly-remove-articles)
5496       (gnus-cache-save-buffers))
5497     (gnus-async-prefetch-remove-group group)
5498     (when gnus-suppress-duplicates
5499       (gnus-dup-enter-articles))
5500     (when gnus-use-trees
5501       (gnus-tree-close group))
5502     (when gnus-use-cache
5503       (gnus-cache-write-active))
5504     ;; Remove entries for this group.
5505     (nnmail-purge-split-history (gnus-group-real-name group))
5506     ;; Make all changes in this group permanent.
5507     (unless quit-config
5508       (gnus-run-hooks 'gnus-exit-group-hook)
5509       (gnus-summary-update-info))
5510     (gnus-close-group group)
5511     ;; Make sure where we were, and go to next newsgroup.
5512     (set-buffer gnus-group-buffer)
5513     (unless quit-config
5514       (gnus-group-jump-to-group group))
5515     (gnus-run-hooks 'gnus-summary-exit-hook)
5516     (unless (or quit-config
5517                 ;; If this group has disappeared from the summary
5518                 ;; buffer, don't skip forwards.
5519                 (not (string= group (gnus-group-group-name))))
5520       (gnus-group-next-unread-group 1))
5521     (setq group-point (point))
5522     (if temporary
5523         nil                             ;Nothing to do.
5524       ;; If we have several article buffers, we kill them at exit.
5525       (unless gnus-single-article-buffer
5526         (gnus-kill-buffer gnus-article-buffer)
5527         (gnus-kill-buffer gnus-original-article-buffer)
5528         (setq gnus-article-current nil))
5529       (set-buffer buf)
5530       (if (not gnus-kill-summary-on-exit)
5531           (gnus-deaden-summary)
5532         ;; We set all buffer-local variables to nil.  It is unclear why
5533         ;; this is needed, but if we don't, buffer-local variables are
5534         ;; not garbage-collected, it seems.  This would the lead to en
5535         ;; ever-growing Emacs.
5536         (gnus-summary-clear-local-variables)
5537         (when (get-buffer gnus-article-buffer)
5538           (bury-buffer gnus-article-buffer))
5539         ;; We clear the global counterparts of the buffer-local
5540         ;; variables as well, just to be on the safe side.
5541         (set-buffer gnus-group-buffer)
5542         (gnus-summary-clear-local-variables)
5543         ;; Return to group mode buffer.
5544         (when (eq mode 'gnus-summary-mode)
5545           (gnus-kill-buffer buf)))
5546       (setq gnus-current-select-method gnus-select-method)
5547       (pop-to-buffer gnus-group-buffer)
5548       (if (not quit-config)
5549           (progn
5550             (goto-char group-point)
5551             (gnus-configure-windows 'group 'force))
5552         (gnus-handle-ephemeral-exit quit-config))
5553       ;; Clear the current group name.
5554       (unless quit-config
5555         (setq gnus-newsgroup-name nil)))))
5556
5557 (defalias 'gnus-summary-quit 'gnus-summary-exit-no-update)
5558 (defun gnus-summary-exit-no-update (&optional no-questions)
5559   "Quit reading current newsgroup without updating read article info."
5560   (interactive)
5561   (let* ((group gnus-newsgroup-name)
5562          (quit-config (gnus-group-quit-config group)))
5563     (when (or no-questions
5564               gnus-expert-user
5565               (gnus-y-or-n-p "Discard changes to this group and exit? "))
5566       (gnus-async-halt-prefetch)
5567       (mapcar 'funcall
5568               (delq 'gnus-summary-expire-articles
5569                     (copy-sequence gnus-summary-prepare-exit-hook)))
5570       (when (gnus-buffer-live-p gnus-article-buffer)
5571         (save-excursion
5572           (set-buffer gnus-article-buffer)
5573           (mm-destroy-parts gnus-article-mime-handles)
5574           ;; Set it to nil for safety reason.
5575           (setq gnus-article-mime-handle-alist nil)
5576           (setq gnus-article-mime-handles nil)))
5577       ;; If we have several article buffers, we kill them at exit.
5578       (unless gnus-single-article-buffer
5579         (gnus-kill-buffer gnus-article-buffer)
5580         (gnus-kill-buffer gnus-original-article-buffer)
5581         (setq gnus-article-current nil))
5582       (if (not gnus-kill-summary-on-exit)
5583           (gnus-deaden-summary)
5584         (gnus-close-group group)
5585         (gnus-summary-clear-local-variables)
5586         (set-buffer gnus-group-buffer)
5587         (gnus-summary-clear-local-variables)
5588         (when (get-buffer gnus-summary-buffer)
5589           (kill-buffer gnus-summary-buffer)))
5590       (unless gnus-single-article-buffer
5591         (setq gnus-article-current nil))
5592       (when gnus-use-trees
5593         (gnus-tree-close group))
5594       (gnus-async-prefetch-remove-group group)
5595       (when (get-buffer gnus-article-buffer)
5596         (bury-buffer gnus-article-buffer))
5597       ;; Return to the group buffer.
5598       (gnus-configure-windows 'group 'force)
5599       ;; Clear the current group name.
5600       (setq gnus-newsgroup-name nil)
5601       (when (equal (gnus-group-group-name) group)
5602         (gnus-group-next-unread-group 1))
5603       (when quit-config
5604         (gnus-handle-ephemeral-exit quit-config)))))
5605
5606 (defun gnus-handle-ephemeral-exit (quit-config)
5607   "Handle movement when leaving an ephemeral group.
5608 The state which existed when entering the ephemeral is reset."
5609   (if (not (buffer-name (car quit-config)))
5610       (gnus-configure-windows 'group 'force)
5611     (set-buffer (car quit-config))
5612     (cond ((eq major-mode 'gnus-summary-mode)
5613            (gnus-set-global-variables))
5614           ((eq major-mode 'gnus-article-mode)
5615            (save-excursion
5616              ;; The `gnus-summary-buffer' variable may point
5617              ;; to the old summary buffer when using a single
5618              ;; article buffer.
5619              (unless (gnus-buffer-live-p gnus-summary-buffer)
5620                (set-buffer gnus-group-buffer))
5621              (set-buffer gnus-summary-buffer)
5622              (gnus-set-global-variables))))
5623     (if (or (eq (cdr quit-config) 'article)
5624             (eq (cdr quit-config) 'pick))
5625         (progn
5626           ;; The current article may be from the ephemeral group
5627           ;; thus it is best that we reload this article
5628           (gnus-summary-show-article)
5629           (if (and (boundp 'gnus-pick-mode) (symbol-value 'gnus-pick-mode))
5630               (gnus-configure-windows 'pick 'force)
5631             (gnus-configure-windows (cdr quit-config) 'force)))
5632       (gnus-configure-windows (cdr quit-config) 'force))
5633     (when (eq major-mode 'gnus-summary-mode)
5634       (gnus-summary-next-subject 1 nil t)
5635       (gnus-summary-recenter)
5636       (gnus-summary-position-point))))
5637
5638 ;;; Dead summaries.
5639
5640 (defvar gnus-dead-summary-mode-map nil)
5641
5642 (unless gnus-dead-summary-mode-map
5643   (setq gnus-dead-summary-mode-map (make-keymap))
5644   (suppress-keymap gnus-dead-summary-mode-map)
5645   (substitute-key-definition
5646    'undefined 'gnus-summary-wake-up-the-dead gnus-dead-summary-mode-map)
5647   (let ((keys '("\C-d" "\r" "\177" [delete])))
5648     (while keys
5649       (define-key gnus-dead-summary-mode-map
5650         (pop keys) 'gnus-summary-wake-up-the-dead))))
5651
5652 (defvar gnus-dead-summary-mode nil
5653   "Minor mode for Gnus summary buffers.")
5654
5655 (defun gnus-dead-summary-mode (&optional arg)
5656   "Minor mode for Gnus summary buffers."
5657   (interactive "P")
5658   (when (eq major-mode 'gnus-summary-mode)
5659     (make-local-variable 'gnus-dead-summary-mode)
5660     (setq gnus-dead-summary-mode
5661           (if (null arg) (not gnus-dead-summary-mode)
5662             (> (prefix-numeric-value arg) 0)))
5663     (when gnus-dead-summary-mode
5664       (gnus-add-minor-mode
5665        'gnus-dead-summary-mode " Dead" gnus-dead-summary-mode-map))))
5666
5667 (defun gnus-deaden-summary ()
5668   "Make the current summary buffer into a dead summary buffer."
5669   ;; Kill any previous dead summary buffer.
5670   (when (and gnus-dead-summary
5671              (buffer-name gnus-dead-summary))
5672     (save-excursion
5673       (set-buffer gnus-dead-summary)
5674       (when gnus-dead-summary-mode
5675         (kill-buffer (current-buffer)))))
5676   ;; Make this the current dead summary.
5677   (setq gnus-dead-summary (current-buffer))
5678   (gnus-dead-summary-mode 1)
5679   (let ((name (buffer-name)))
5680     (when (string-match "Summary" name)
5681       (rename-buffer
5682        (concat (substring name 0 (match-beginning 0)) "Dead "
5683                (substring name (match-beginning 0)))
5684        t)
5685       (bury-buffer))))
5686
5687 (defun gnus-kill-or-deaden-summary (buffer)
5688   "Kill or deaden the summary BUFFER."
5689   (save-excursion
5690     (when (and (buffer-name buffer)
5691                (not gnus-single-article-buffer))
5692       (save-excursion
5693         (set-buffer buffer)
5694         (gnus-kill-buffer gnus-article-buffer)
5695         (gnus-kill-buffer gnus-original-article-buffer)))
5696     (cond (gnus-kill-summary-on-exit
5697            (when (and gnus-use-trees
5698                       (gnus-buffer-exists-p buffer))
5699              (save-excursion
5700                (set-buffer buffer)
5701                (gnus-tree-close gnus-newsgroup-name)))
5702            (gnus-kill-buffer buffer))
5703           ((gnus-buffer-exists-p buffer)
5704            (save-excursion
5705              (set-buffer buffer)
5706              (gnus-deaden-summary))))))
5707
5708 (defun gnus-summary-wake-up-the-dead (&rest args)
5709   "Wake up the dead summary buffer."
5710   (interactive)
5711   (gnus-dead-summary-mode -1)
5712   (let ((name (buffer-name)))
5713     (when (string-match "Dead " name)
5714       (rename-buffer
5715        (concat (substring name 0 (match-beginning 0))
5716                (substring name (match-end 0)))
5717        t)))
5718   (gnus-message 3 "This dead summary is now alive again"))
5719
5720 ;; Suggested by Andrew Eskilsson <pi92ae@pt.hk-r.se>.
5721 (defun gnus-summary-fetch-faq (&optional faq-dir)
5722   "Fetch the FAQ for the current group.
5723 If FAQ-DIR (the prefix), prompt for a directory to search for the faq
5724 in."
5725   (interactive
5726    (list
5727     (when current-prefix-arg
5728       (completing-read
5729        "Faq dir: " (and (listp gnus-group-faq-directory)
5730                         (mapcar (lambda (file) (list file))
5731                                 gnus-group-faq-directory))))))
5732   (let (gnus-faq-buffer)
5733     (when (setq gnus-faq-buffer
5734                 (gnus-group-fetch-faq gnus-newsgroup-name faq-dir))
5735       (gnus-configure-windows 'summary-faq))))
5736
5737 ;; Suggested by Per Abrahamsen <amanda@iesd.auc.dk>.
5738 (defun gnus-summary-describe-group (&optional force)
5739   "Describe the current newsgroup."
5740   (interactive "P")
5741   (gnus-group-describe-group force gnus-newsgroup-name))
5742
5743 (defun gnus-summary-describe-briefly ()
5744   "Describe summary mode commands briefly."
5745   (interactive)
5746   (gnus-message 6 (substitute-command-keys "\\<gnus-summary-mode-map>\\[gnus-summary-next-page]:Select  \\[gnus-summary-next-unread-article]:Forward  \\[gnus-summary-prev-unread-article]:Backward  \\[gnus-summary-exit]:Exit  \\[gnus-info-find-node]:Run Info        \\[gnus-summary-describe-briefly]:This help")))
5747
5748 ;; Walking around group mode buffer from summary mode.
5749
5750 (defun gnus-summary-next-group (&optional no-article target-group backward)
5751   "Exit current newsgroup and then select next unread newsgroup.
5752 If prefix argument NO-ARTICLE is non-nil, no article is selected
5753 initially.  If NEXT-GROUP, go to this group.  If BACKWARD, go to
5754 previous group instead."
5755   (interactive "P")
5756   ;; Stop pre-fetching.
5757   (gnus-async-halt-prefetch)
5758   (let ((current-group gnus-newsgroup-name)
5759         (current-buffer (current-buffer))
5760         entered)
5761     ;; First we semi-exit this group to update Xrefs and all variables.
5762     ;; We can't do a real exit, because the window conf must remain
5763     ;; the same in case the user is prompted for info, and we don't
5764     ;; want the window conf to change before that...
5765     (gnus-summary-exit t)
5766     (while (not entered)
5767       ;; Then we find what group we are supposed to enter.
5768       (set-buffer gnus-group-buffer)
5769       (gnus-group-jump-to-group current-group)
5770       (setq target-group
5771             (or target-group
5772                 (if (eq gnus-keep-same-level 'best)
5773                     (gnus-summary-best-group gnus-newsgroup-name)
5774                   (gnus-summary-search-group backward gnus-keep-same-level))))
5775       (if (not target-group)
5776           ;; There are no further groups, so we return to the group
5777           ;; buffer.
5778           (progn
5779             (gnus-message 5 "Returning to the group buffer")
5780             (setq entered t)
5781             (when (gnus-buffer-live-p current-buffer)
5782               (set-buffer current-buffer)
5783               (gnus-summary-exit))
5784             (gnus-run-hooks 'gnus-group-no-more-groups-hook))
5785         ;; We try to enter the target group.
5786         (gnus-group-jump-to-group target-group)
5787         (let ((unreads (gnus-group-group-unread)))
5788           (if (and (or (eq t unreads)
5789                        (and unreads (not (zerop unreads))))
5790                    (gnus-summary-read-group
5791                     target-group nil no-article
5792                     (and (buffer-name current-buffer) current-buffer)
5793                     nil backward))
5794               (setq entered t)
5795             (setq current-group target-group
5796                   target-group nil)))))))
5797
5798 (defun gnus-summary-prev-group (&optional no-article)
5799   "Exit current newsgroup and then select previous unread newsgroup.
5800 If prefix argument NO-ARTICLE is non-nil, no article is selected initially."
5801   (interactive "P")
5802   (gnus-summary-next-group no-article nil t))
5803
5804 ;; Walking around summary lines.
5805
5806 (defun gnus-summary-first-subject (&optional unread undownloaded)
5807   "Go to the first unread subject.
5808 If UNREAD is non-nil, go to the first unread article.
5809 Returns the article selected or nil if there are no unread articles."
5810   (interactive "P")
5811   (prog1
5812       (cond
5813        ;; Empty summary.
5814        ((null gnus-newsgroup-data)
5815         (gnus-message 3 "No articles in the group")
5816         nil)
5817        ;; Pick the first article.
5818        ((not unread)
5819         (goto-char (gnus-data-pos (car gnus-newsgroup-data)))
5820         (gnus-data-number (car gnus-newsgroup-data)))
5821        ;; No unread articles.
5822        ((null gnus-newsgroup-unreads)
5823         (gnus-message 3 "No more unread articles")
5824         nil)
5825        ;; Find the first unread article.
5826        (t
5827         (let ((data gnus-newsgroup-data))
5828           (while (and data
5829                       (and (not (and undownloaded
5830                                      (eq gnus-undownloaded-mark
5831                                          (gnus-data-mark (car data)))))
5832                            (not (gnus-data-unread-p (car data)))))
5833             (setq data (cdr data)))
5834           (when data
5835             (goto-char (gnus-data-pos (car data)))
5836             (gnus-data-number (car data))))))
5837     (gnus-summary-position-point)))
5838
5839 (defun gnus-summary-next-subject (n &optional unread dont-display)
5840   "Go to next N'th summary line.
5841 If N is negative, go to the previous N'th subject line.
5842 If UNREAD is non-nil, only unread articles are selected.
5843 The difference between N and the actual number of steps taken is
5844 returned."
5845   (interactive "p")
5846   (let ((backward (< n 0))
5847         (n (abs n)))
5848     (while (and (> n 0)
5849                 (if backward
5850                     (gnus-summary-find-prev unread)
5851                   (gnus-summary-find-next unread)))
5852       (unless (zerop (setq n (1- n)))
5853         (gnus-summary-show-thread)))
5854     (when (/= 0 n)
5855       (gnus-message 7 "No more%s articles"
5856                     (if unread " unread" "")))
5857     (unless dont-display
5858       (gnus-summary-recenter)
5859       (gnus-summary-position-point))
5860     n))
5861
5862 (defun gnus-summary-next-unread-subject (n)
5863   "Go to next N'th unread summary line."
5864   (interactive "p")
5865   (gnus-summary-next-subject n t))
5866
5867 (defun gnus-summary-prev-subject (n &optional unread)
5868   "Go to previous N'th summary line.
5869 If optional argument UNREAD is non-nil, only unread article is selected."
5870   (interactive "p")
5871   (gnus-summary-next-subject (- n) unread))
5872
5873 (defun gnus-summary-prev-unread-subject (n)
5874   "Go to previous N'th unread summary line."
5875   (interactive "p")
5876   (gnus-summary-next-subject (- n) t))
5877
5878 (defun gnus-summary-goto-subject (article &optional force silent)
5879   "Go the subject line of ARTICLE.
5880 If FORCE, also allow jumping to articles not currently shown."
5881   (interactive "nArticle number: ")
5882   (let ((b (point))
5883         (data (gnus-data-find article)))
5884     ;; We read in the article if we have to.
5885     (and (not data)
5886          force
5887          (gnus-summary-insert-subject
5888           article
5889           (if (or (numberp force) (vectorp force)) force)
5890           t)
5891          (setq data (gnus-data-find article)))
5892     (goto-char b)
5893     (if (not data)
5894         (progn
5895           (unless silent
5896             (gnus-message 3 "Can't find article %d" article))
5897           nil)
5898       (goto-char (gnus-data-pos data))
5899       (gnus-summary-position-point)
5900       article)))
5901
5902 ;; Walking around summary lines with displaying articles.
5903
5904 (defun gnus-summary-expand-window (&optional arg)
5905   "Make the summary buffer take up the entire Emacs frame.
5906 Given a prefix, will force an `article' buffer configuration."
5907   (interactive "P")
5908   (if arg
5909       (gnus-configure-windows 'article 'force)
5910     (gnus-configure-windows 'summary 'force)))
5911
5912 (defun gnus-summary-display-article (article &optional all-header)
5913   "Display ARTICLE in article buffer."
5914   (when (gnus-buffer-live-p gnus-article-buffer)
5915     (with-current-buffer gnus-article-buffer
5916       (mm-enable-multibyte-mule4)))
5917   (gnus-set-global-variables)
5918   (if (null article)
5919       nil
5920     (prog1
5921         (if gnus-summary-display-article-function
5922             (funcall gnus-summary-display-article-function article all-header)
5923           (gnus-article-prepare article all-header))
5924       (gnus-run-hooks 'gnus-select-article-hook)
5925       (when (and gnus-current-article
5926                  (not (zerop gnus-current-article)))
5927         (gnus-summary-goto-subject gnus-current-article))
5928       (gnus-summary-recenter)
5929       (when (and gnus-use-trees gnus-show-threads)
5930         (gnus-possibly-generate-tree article)
5931         (gnus-highlight-selected-tree article))
5932       ;; Successfully display article.
5933       (gnus-article-set-window-start
5934        (cdr (assq article gnus-newsgroup-bookmarks))))))
5935
5936 (defun gnus-summary-select-article (&optional all-headers force pseudo article)
5937   "Select the current article.
5938 If ALL-HEADERS is non-nil, show all header fields.  If FORCE is
5939 non-nil, the article will be re-fetched even if it already present in
5940 the article buffer.  If PSEUDO is non-nil, pseudo-articles will also
5941 be displayed."
5942   ;; Make sure we are in the summary buffer to work around bbdb bug.
5943   (unless (eq major-mode 'gnus-summary-mode)
5944     (set-buffer gnus-summary-buffer))
5945   (let ((article (or article (gnus-summary-article-number)))
5946         (all-headers (not (not all-headers))) ;Must be T or NIL.
5947         gnus-summary-display-article-function)
5948     (and (not pseudo)
5949          (gnus-summary-article-pseudo-p article)
5950          (error "This is a pseudo-article"))
5951     (save-excursion
5952       (set-buffer gnus-summary-buffer)
5953       (if (or (and gnus-single-article-buffer
5954                    (or (null gnus-current-article)
5955                        (null gnus-article-current)
5956                        (null (get-buffer gnus-article-buffer))
5957                        (not (eq article (cdr gnus-article-current)))
5958                        (not (equal (car gnus-article-current)
5959                                    gnus-newsgroup-name))))
5960               (and (not gnus-single-article-buffer)
5961                    (or (null gnus-current-article)
5962                        (not (eq gnus-current-article article))))
5963               force)
5964           ;; The requested article is different from the current article.
5965           (progn
5966             (gnus-summary-display-article article all-headers)
5967             (when (gnus-buffer-live-p gnus-article-buffer)
5968                (with-current-buffer gnus-article-buffer
5969                 (if (not gnus-article-decoded-p) ;; a local variable
5970                     (mm-disable-multibyte-mule4))))
5971             (when (or all-headers gnus-show-all-headers)
5972               (gnus-article-show-all-headers))
5973             (gnus-article-set-window-start
5974              (cdr (assq article gnus-newsgroup-bookmarks)))
5975             article)
5976         (when (or all-headers gnus-show-all-headers)
5977           (gnus-article-show-all-headers))
5978         'old))))
5979
5980 (defun gnus-summary-set-current-mark (&optional current-mark)
5981   "Obsolete function."
5982   nil)
5983
5984 (defun gnus-summary-next-article (&optional unread subject backward push)
5985   "Select the next article.
5986 If UNREAD, only unread articles are selected.
5987 If SUBJECT, only articles with SUBJECT are selected.
5988 If BACKWARD, the previous article is selected instead of the next."
5989   (interactive "P")
5990   (cond
5991    ;; Is there such an article?
5992    ((and (gnus-summary-search-forward unread subject backward)
5993          (or (gnus-summary-display-article (gnus-summary-article-number))
5994              (eq (gnus-summary-article-mark) gnus-canceled-mark)))
5995     (gnus-summary-position-point))
5996    ;; If not, we try the first unread, if that is wanted.
5997    ((and subject
5998          gnus-auto-select-same
5999          (gnus-summary-first-unread-article))
6000     (gnus-summary-position-point)
6001     (gnus-message 6 "Wrapped"))
6002    ;; Try to get next/previous article not displayed in this group.
6003    ((and gnus-auto-extend-newsgroup
6004          (not unread) (not subject))
6005     (gnus-summary-goto-article
6006      (if backward (1- gnus-newsgroup-begin) (1+ gnus-newsgroup-end))
6007      nil (count-lines (point-min) (point))))
6008    ;; Go to next/previous group.
6009    (t
6010     (unless (gnus-ephemeral-group-p gnus-newsgroup-name)
6011       (gnus-summary-jump-to-group gnus-newsgroup-name))
6012     (let ((cmd last-command-char)
6013           (point
6014            (save-excursion
6015              (set-buffer gnus-group-buffer)
6016              (point)))
6017           (group
6018            (if (eq gnus-keep-same-level 'best)
6019                (gnus-summary-best-group gnus-newsgroup-name)
6020              (gnus-summary-search-group backward gnus-keep-same-level))))
6021       ;; For some reason, the group window gets selected.  We change
6022       ;; it back.
6023       (select-window (get-buffer-window (current-buffer)))
6024       ;; Select next unread newsgroup automagically.
6025       (cond
6026        ((or (not gnus-auto-select-next)
6027             (not cmd))
6028         (gnus-message 7 "No more%s articles" (if unread " unread" "")))
6029        ((or (eq gnus-auto-select-next 'quietly)
6030             (and (eq gnus-auto-select-next 'slightly-quietly)
6031                  push)
6032             (and (eq gnus-auto-select-next 'almost-quietly)
6033                  (gnus-summary-last-article-p)))
6034         ;; Select quietly.
6035         (if (gnus-ephemeral-group-p gnus-newsgroup-name)
6036             (gnus-summary-exit)
6037           (gnus-message 7 "No more%s articles (%s)..."
6038                         (if unread " unread" "")
6039                         (if group (concat "selecting " group)
6040                           "exiting"))
6041           (gnus-summary-next-group nil group backward)))
6042        (t
6043         (when (gnus-key-press-event-p last-input-event)
6044           (gnus-summary-walk-group-buffer
6045            gnus-newsgroup-name cmd unread backward point))))))))
6046
6047 (defun gnus-summary-walk-group-buffer (from-group cmd unread backward start)
6048   (let ((keystrokes '((?\C-n (gnus-group-next-unread-group 1))
6049                       (?\C-p (gnus-group-prev-unread-group 1))))
6050         (cursor-in-echo-area t)
6051         keve key group ended)
6052     (save-excursion
6053       (set-buffer gnus-group-buffer)
6054       (goto-char start)
6055       (setq group
6056             (if (eq gnus-keep-same-level 'best)
6057                 (gnus-summary-best-group gnus-newsgroup-name)
6058               (gnus-summary-search-group backward gnus-keep-same-level))))
6059     (while (not ended)
6060       (gnus-message
6061        5 "No more%s articles%s" (if unread " unread" "")
6062        (if (and group
6063                 (not (gnus-ephemeral-group-p gnus-newsgroup-name)))
6064            (format " (Type %s for %s [%s])"
6065                    (single-key-description cmd) group
6066                    (car (gnus-gethash group gnus-newsrc-hashtb)))
6067          (format " (Type %s to exit %s)"
6068                  (single-key-description cmd)
6069                  gnus-newsgroup-name)))
6070       ;; Confirm auto selection.
6071       (setq key (car (setq keve (gnus-read-event-char))))
6072       (setq ended t)
6073       (cond
6074        ((assq key keystrokes)
6075         (let ((obuf (current-buffer)))
6076           (switch-to-buffer gnus-group-buffer)
6077           (when group
6078             (gnus-group-jump-to-group group))
6079           (eval (cadr (assq key keystrokes)))
6080           (setq group (gnus-group-group-name))
6081           (switch-to-buffer obuf))
6082         (setq ended nil))
6083        ((equal key cmd)
6084         (if (or (not group)
6085                 (gnus-ephemeral-group-p gnus-newsgroup-name))
6086             (gnus-summary-exit)
6087           (gnus-summary-next-group nil group backward)))
6088        (t
6089         (push (cdr keve) unread-command-events))))))
6090
6091 (defun gnus-summary-next-unread-article ()
6092   "Select unread article after current one."
6093   (interactive)
6094   (gnus-summary-next-article
6095    (or (not (eq gnus-summary-goto-unread 'never))
6096        (gnus-summary-last-article-p (gnus-summary-article-number)))
6097    (and gnus-auto-select-same
6098         (gnus-summary-article-subject))))
6099
6100 (defun gnus-summary-prev-article (&optional unread subject)
6101   "Select the article after the current one.
6102 If UNREAD is non-nil, only unread articles are selected."
6103   (interactive "P")
6104   (gnus-summary-next-article unread subject t))
6105
6106 (defun gnus-summary-prev-unread-article ()
6107   "Select unread article before current one."
6108   (interactive)
6109   (gnus-summary-prev-article
6110    (or (not (eq gnus-summary-goto-unread 'never))
6111        (gnus-summary-first-article-p (gnus-summary-article-number)))
6112    (and gnus-auto-select-same
6113         (gnus-summary-article-subject))))
6114
6115 (defun gnus-summary-next-page (&optional lines circular)
6116   "Show next page of the selected article.
6117 If at the end of the current article, select the next article.
6118 LINES says how many lines should be scrolled up.
6119
6120 If CIRCULAR is non-nil, go to the start of the article instead of
6121 selecting the next article when reaching the end of the current
6122 article."
6123   (interactive "P")
6124   (setq gnus-summary-buffer (current-buffer))
6125   (gnus-set-global-variables)
6126   (let ((article (gnus-summary-article-number))
6127         (article-window (get-buffer-window gnus-article-buffer t))
6128         endp)
6129     ;; If the buffer is empty, we have no article.
6130     (unless article
6131       (error "No article to select"))
6132     (gnus-configure-windows 'article)
6133     (if (eq (cdr (assq article gnus-newsgroup-reads)) gnus-canceled-mark)
6134         (if (and (eq gnus-summary-goto-unread 'never)
6135                  (not (gnus-summary-last-article-p article)))
6136             (gnus-summary-next-article)
6137           (gnus-summary-next-unread-article))
6138       (if (or (null gnus-current-article)
6139               (null gnus-article-current)
6140               (/= article (cdr gnus-article-current))
6141               (not (equal (car gnus-article-current) gnus-newsgroup-name)))
6142           ;; Selected subject is different from current article's.
6143           (gnus-summary-display-article article)
6144         (when article-window
6145           (gnus-eval-in-buffer-window gnus-article-buffer
6146             (setq endp (gnus-article-next-page lines)))
6147           (when endp
6148             (cond (circular
6149                    (gnus-summary-beginning-of-article))
6150                   (lines
6151                    (gnus-message 3 "End of message"))
6152                   ((null lines)
6153                    (if (and (eq gnus-summary-goto-unread 'never)
6154                             (not (gnus-summary-last-article-p article)))
6155                        (gnus-summary-next-article)
6156                      (gnus-summary-next-unread-article))))))))
6157     (gnus-summary-recenter)
6158     (gnus-summary-position-point)))
6159
6160 (defun gnus-summary-prev-page (&optional lines move)
6161   "Show previous page of selected article.
6162 Argument LINES specifies lines to be scrolled down.
6163 If MOVE, move to the previous unread article if point is at
6164 the beginning of the buffer."
6165   (interactive "P")
6166   (let ((article (gnus-summary-article-number))
6167         (article-window (get-buffer-window gnus-article-buffer t))
6168         endp)
6169     (gnus-configure-windows 'article)
6170     (if (or (null gnus-current-article)
6171             (null gnus-article-current)
6172             (/= article (cdr gnus-article-current))
6173             (not (equal (car gnus-article-current) gnus-newsgroup-name)))
6174         ;; Selected subject is different from current article's.
6175         (gnus-summary-display-article article)
6176       (gnus-summary-recenter)
6177       (when article-window
6178         (gnus-eval-in-buffer-window gnus-article-buffer
6179           (setq endp (gnus-article-prev-page lines)))
6180         (when (and move endp)
6181           (cond (lines
6182                  (gnus-message 3 "Beginning of message"))
6183                 ((null lines)
6184                  (if (and (eq gnus-summary-goto-unread 'never)
6185                           (not (gnus-summary-first-article-p article)))
6186                      (gnus-summary-prev-article)
6187                    (gnus-summary-prev-unread-article))))))))
6188   (gnus-summary-position-point))
6189
6190 (defun gnus-summary-prev-page-or-article (&optional lines)
6191   "Show previous page of selected article.
6192 Argument LINES specifies lines to be scrolled down.
6193 If at the beginning of the article, go to the next article."
6194   (interactive "P")
6195   (gnus-summary-prev-page lines t))
6196
6197 (defun gnus-summary-scroll-up (lines)
6198   "Scroll up (or down) one line current article.
6199 Argument LINES specifies lines to be scrolled up (or down if negative)."
6200   (interactive "p")
6201   (gnus-configure-windows 'article)
6202   (gnus-summary-show-thread)
6203   (when (eq (gnus-summary-select-article nil nil 'pseudo) 'old)
6204     (gnus-eval-in-buffer-window gnus-article-buffer
6205       (cond ((> lines 0)
6206              (when (gnus-article-next-page lines)
6207                (gnus-message 3 "End of message")))
6208             ((< lines 0)
6209              (gnus-article-prev-page (- lines))))))
6210   (gnus-summary-recenter)
6211   (gnus-summary-position-point))
6212
6213 (defun gnus-summary-scroll-down (lines)
6214   "Scroll down (or up) one line current article.
6215 Argument LINES specifies lines to be scrolled down (or up if negative)."
6216   (interactive "p")
6217   (gnus-summary-scroll-up (- lines)))
6218
6219 (defun gnus-summary-next-same-subject ()
6220   "Select next article which has the same subject as current one."
6221   (interactive)
6222   (gnus-summary-next-article nil (gnus-summary-article-subject)))
6223
6224 (defun gnus-summary-prev-same-subject ()
6225   "Select previous article which has the same subject as current one."
6226   (interactive)
6227   (gnus-summary-prev-article nil (gnus-summary-article-subject)))
6228
6229 (defun gnus-summary-next-unread-same-subject ()
6230   "Select next unread article which has the same subject as current one."
6231   (interactive)
6232   (gnus-summary-next-article t (gnus-summary-article-subject)))
6233
6234 (defun gnus-summary-prev-unread-same-subject ()
6235   "Select previous unread article which has the same subject as current one."
6236   (interactive)
6237   (gnus-summary-prev-article t (gnus-summary-article-subject)))
6238
6239 (defun gnus-summary-first-unread-article ()
6240   "Select the first unread article.
6241 Return nil if there are no unread articles."
6242   (interactive)
6243   (prog1
6244       (when (gnus-summary-first-subject t)
6245         (gnus-summary-show-thread)
6246         (gnus-summary-first-subject t)
6247         (gnus-summary-display-article (gnus-summary-article-number)))
6248     (gnus-summary-position-point)))
6249
6250 (defun gnus-summary-first-unread-subject ()
6251   "Place the point on the subject line of the first unread article.
6252 Return nil if there are no unread articles."
6253   (interactive)
6254   (prog1
6255       (when (gnus-summary-first-subject t)
6256         (gnus-summary-show-thread)
6257         (gnus-summary-first-subject t))
6258     (gnus-summary-position-point)))
6259
6260 (defun gnus-summary-first-article ()
6261   "Select the first article.
6262 Return nil if there are no articles."
6263   (interactive)
6264   (prog1
6265       (when (gnus-summary-first-subject)
6266         (gnus-summary-show-thread)
6267         (gnus-summary-first-subject)
6268         (gnus-summary-display-article (gnus-summary-article-number)))
6269     (gnus-summary-position-point)))
6270
6271 (defun gnus-summary-best-unread-article ()
6272   "Select the unread article with the highest score."
6273   (interactive)
6274   (let ((best -1000000)
6275         (data gnus-newsgroup-data)
6276         article score)
6277     (while data
6278       (and (gnus-data-unread-p (car data))
6279            (> (setq score
6280                     (gnus-summary-article-score (gnus-data-number (car data))))
6281               best)
6282            (setq best score
6283                  article (gnus-data-number (car data))))
6284       (setq data (cdr data)))
6285     (prog1
6286         (if article
6287             (gnus-summary-goto-article article)
6288           (error "No unread articles"))
6289       (gnus-summary-position-point))))
6290
6291 (defun gnus-summary-last-subject ()
6292   "Go to the last displayed subject line in the group."
6293   (let ((article (gnus-data-number (car (gnus-data-list t)))))
6294     (when article
6295       (gnus-summary-goto-subject article))))
6296
6297 (defun gnus-summary-goto-article (article &optional all-headers force)
6298   "Fetch ARTICLE (article number or Message-ID) and display it if it exists.
6299 If ALL-HEADERS is non-nil, no header lines are hidden.
6300 If FORCE, go to the article even if it isn't displayed.  If FORCE
6301 is a number, it is the line the article is to be displayed on."
6302   (interactive
6303    (list
6304     (completing-read
6305      "Article number or Message-ID: "
6306      (mapcar (lambda (number) (list (int-to-string number)))
6307              gnus-newsgroup-limit))
6308     current-prefix-arg
6309     t))
6310   (prog1
6311       (if (and (stringp article)
6312                (string-match "@" article))
6313           (gnus-summary-refer-article article)
6314         (when (stringp article)
6315           (setq article (string-to-number article)))
6316         (if (gnus-summary-goto-subject article force)
6317             (gnus-summary-display-article article all-headers)
6318           (gnus-message 4 "Couldn't go to article %s" article) nil))
6319     (gnus-summary-position-point)))
6320
6321 (defun gnus-summary-goto-last-article ()
6322   "Go to the previously read article."
6323   (interactive)
6324   (prog1
6325       (when gnus-last-article
6326         (gnus-summary-goto-article gnus-last-article nil t))
6327     (gnus-summary-position-point)))
6328
6329 (defun gnus-summary-pop-article (number)
6330   "Pop one article off the history and go to the previous.
6331 NUMBER articles will be popped off."
6332   (interactive "p")
6333   (let (to)
6334     (setq gnus-newsgroup-history
6335           (cdr (setq to (nthcdr number gnus-newsgroup-history))))
6336     (if to
6337         (gnus-summary-goto-article (car to) nil t)
6338       (error "Article history empty")))
6339   (gnus-summary-position-point))
6340
6341 ;; Summary commands and functions for limiting the summary buffer.
6342
6343 (defun gnus-summary-limit-to-articles (n)
6344   "Limit the summary buffer to the next N articles.
6345 If not given a prefix, use the process marked articles instead."
6346   (interactive "P")
6347   (prog1
6348       (let ((articles (gnus-summary-work-articles n)))
6349         (setq gnus-newsgroup-processable nil)
6350         (gnus-summary-limit articles))
6351     (gnus-summary-position-point)))
6352
6353 (defun gnus-summary-pop-limit (&optional total)
6354   "Restore the previous limit.
6355 If given a prefix, remove all limits."
6356   (interactive "P")
6357   (when total
6358     (setq gnus-newsgroup-limits
6359           (list (mapcar (lambda (h) (mail-header-number h))
6360                         gnus-newsgroup-headers))))
6361   (unless gnus-newsgroup-limits
6362     (error "No limit to pop"))
6363   (prog1
6364       (gnus-summary-limit nil 'pop)
6365     (gnus-summary-position-point)))
6366
6367 (defun gnus-summary-limit-to-subject (subject &optional header)
6368   "Limit the summary buffer to articles that have subjects that match a regexp."
6369   (interactive "sLimit to subject (regexp): ")
6370   (unless header
6371     (setq header "subject"))
6372   (when (not (equal "" subject))
6373     (prog1
6374         (let ((articles (gnus-summary-find-matching
6375                          (or header "subject") subject 'all)))
6376           (unless articles
6377             (error "Found no matches for \"%s\"" subject))
6378           (gnus-summary-limit articles))
6379       (gnus-summary-position-point))))
6380
6381 (defun gnus-summary-limit-to-author (from)
6382   "Limit the summary buffer to articles that have authors that match a regexp."
6383   (interactive "sLimit to author (regexp): ")
6384   (gnus-summary-limit-to-subject from "from"))
6385
6386 (defun gnus-summary-limit-to-age (age &optional younger-p)
6387   "Limit the summary buffer to articles that are older than (or equal) AGE days.
6388 If YOUNGER-P (the prefix) is non-nil, limit the summary buffer to
6389 articles that are younger than AGE days."
6390   (interactive
6391    (let ((younger current-prefix-arg)
6392          (days-got nil)
6393          days)
6394      (while (not days-got)
6395        (setq days (if younger
6396                       (read-string "Limit to articles within (in days): ")
6397                     (read-string "Limit to articles old than (in days): ")))
6398        (when (> (length days) 0)
6399          (setq days (read days)))
6400        (if (numberp days)
6401            (setq days-got t)
6402          (message "Please enter a number.")
6403          (sleep-for 1)))
6404      (list days younger)))
6405   (prog1
6406       (let ((data gnus-newsgroup-data)
6407             (cutoff (days-to-time age))
6408             articles d date is-younger)
6409         (while (setq d (pop data))
6410           (when (and (vectorp (gnus-data-header d))
6411                      (setq date (mail-header-date (gnus-data-header d))))
6412             (setq is-younger (time-less-p
6413                               (time-since (condition-case ()
6414                                               (date-to-time date)
6415                                             (error '(0 0))))
6416                               cutoff))
6417             (when (if younger-p
6418                       is-younger
6419                     (not is-younger))
6420               (push (gnus-data-number d) articles))))
6421         (gnus-summary-limit (nreverse articles)))
6422     (gnus-summary-position-point)))
6423
6424 (defun gnus-summary-limit-to-extra (header regexp)
6425   "Limit the summary buffer to articles that match an 'extra' header."
6426   (interactive
6427    (let ((header
6428           (intern
6429            (gnus-completing-read
6430             (symbol-name (car gnus-extra-headers))
6431             "Limit extra header:"
6432             (mapcar (lambda (x)
6433                       (cons (symbol-name x) x))
6434                     gnus-extra-headers)
6435             nil
6436             t))))
6437      (list header
6438            (read-string (format "Limit to header %s (regexp): " header)))))
6439   (when (not (equal "" regexp))
6440     (prog1
6441         (let ((articles (gnus-summary-find-matching
6442                          (cons 'extra header) regexp 'all)))
6443           (unless articles
6444             (error "Found no matches for \"%s\"" regexp))
6445           (gnus-summary-limit articles))
6446       (gnus-summary-position-point))))
6447
6448 (defalias 'gnus-summary-delete-marked-as-read 'gnus-summary-limit-to-unread)
6449 (make-obsolete
6450  'gnus-summary-delete-marked-as-read 'gnus-summary-limit-to-unread)
6451
6452 (defun gnus-summary-limit-to-unread (&optional all)
6453   "Limit the summary buffer to articles that are not marked as read.
6454 If ALL is non-nil, limit strictly to unread articles."
6455   (interactive "P")
6456   (if all
6457       (gnus-summary-limit-to-marks (char-to-string gnus-unread-mark))
6458     (gnus-summary-limit-to-marks
6459      ;; Concat all the marks that say that an article is read and have
6460      ;; those removed.
6461      (list gnus-del-mark gnus-read-mark gnus-ancient-mark
6462            gnus-killed-mark gnus-kill-file-mark
6463            gnus-low-score-mark gnus-expirable-mark
6464            gnus-canceled-mark gnus-catchup-mark gnus-sparse-mark
6465            gnus-duplicate-mark gnus-souped-mark)
6466      'reverse)))
6467
6468 (defalias 'gnus-summary-delete-marked-with 'gnus-summary-limit-exclude-marks)
6469 (make-obsolete 'gnus-summary-delete-marked-with
6470                'gnus-summary-limit-exlude-marks)
6471
6472 (defun gnus-summary-limit-exclude-marks (marks &optional reverse)
6473   "Exclude articles that are marked with MARKS (e.g. \"DK\").
6474 If REVERSE, limit the summary buffer to articles that are marked
6475 with MARKS.  MARKS can either be a string of marks or a list of marks.
6476 Returns how many articles were removed."
6477   (interactive "sMarks: ")
6478   (gnus-summary-limit-to-marks marks t))
6479
6480 (defun gnus-summary-limit-to-marks (marks &optional reverse)
6481   "Limit the summary buffer to articles that are marked with MARKS (e.g. \"DK\").
6482 If REVERSE (the prefix), limit the summary buffer to articles that are
6483 not marked with MARKS.  MARKS can either be a string of marks or a
6484 list of marks.
6485 Returns how many articles were removed."
6486   (interactive "sMarks: \nP")
6487   (prog1
6488       (let ((data gnus-newsgroup-data)
6489             (marks (if (listp marks) marks
6490                      (append marks nil))) ; Transform to list.
6491             articles)
6492         (while data
6493           (when (if reverse (not (memq (gnus-data-mark (car data)) marks))
6494                   (memq (gnus-data-mark (car data)) marks))
6495             (push (gnus-data-number (car data)) articles))
6496           (setq data (cdr data)))
6497         (gnus-summary-limit articles))
6498     (gnus-summary-position-point)))
6499
6500 (defun gnus-summary-limit-to-score (&optional score)
6501   "Limit to articles with score at or above SCORE."
6502   (interactive "P")
6503   (setq score (if score
6504                   (prefix-numeric-value score)
6505                 (or gnus-summary-default-score 0)))
6506   (let ((data gnus-newsgroup-data)
6507         articles)
6508     (while data
6509       (when (>= (gnus-summary-article-score (gnus-data-number (car data)))
6510                 score)
6511         (push (gnus-data-number (car data)) articles))
6512       (setq data (cdr data)))
6513     (prog1
6514         (gnus-summary-limit articles)
6515       (gnus-summary-position-point))))
6516
6517 (defun gnus-summary-limit-include-thread (id)
6518   "Display all the hidden articles that in the current thread."
6519   (interactive (list (mail-header-id (gnus-summary-article-header))))
6520   (let ((articles (gnus-articles-in-thread
6521                    (gnus-id-to-thread (gnus-root-id id)))))
6522     (prog1
6523         (gnus-summary-limit (nconc articles gnus-newsgroup-limit))
6524       (gnus-summary-position-point))))
6525
6526 (defun gnus-summary-limit-include-dormant ()
6527   "Display all the hidden articles that are marked as dormant.
6528 Note that this command only works on a subset of the articles currently
6529 fetched for this group."
6530   (interactive)
6531   (unless gnus-newsgroup-dormant
6532     (error "There are no dormant articles in this group"))
6533   (prog1
6534       (gnus-summary-limit (append gnus-newsgroup-dormant gnus-newsgroup-limit))
6535     (gnus-summary-position-point)))
6536
6537 (defun gnus-summary-limit-exclude-dormant ()
6538   "Hide all dormant articles."
6539   (interactive)
6540   (prog1
6541       (gnus-summary-limit-to-marks (list gnus-dormant-mark) 'reverse)
6542     (gnus-summary-position-point)))
6543
6544 (defun gnus-summary-limit-exclude-childless-dormant ()
6545   "Hide all dormant articles that have no children."
6546   (interactive)
6547   (let ((data (gnus-data-list t))
6548         articles d children)
6549     ;; Find all articles that are either not dormant or have
6550     ;; children.
6551     (while (setq d (pop data))
6552       (when (or (not (= (gnus-data-mark d) gnus-dormant-mark))
6553                 (and (setq children
6554                            (gnus-article-children (gnus-data-number d)))
6555                      (let (found)
6556                        (while children
6557                          (when (memq (car children) articles)
6558                            (setq children nil
6559                                  found t))
6560                          (pop children))
6561                        found)))
6562         (push (gnus-data-number d) articles)))
6563     ;; Do the limiting.
6564     (prog1
6565         (gnus-summary-limit articles)
6566       (gnus-summary-position-point))))
6567
6568 (defun gnus-summary-limit-mark-excluded-as-read (&optional all)
6569   "Mark all unread excluded articles as read.
6570 If ALL, mark even excluded ticked and dormants as read."
6571   (interactive "P")
6572   (let ((articles (gnus-sorted-complement
6573                    (sort
6574                     (mapcar (lambda (h) (mail-header-number h))
6575                             gnus-newsgroup-headers)
6576                     '<)
6577                    (sort gnus-newsgroup-limit '<)))
6578         article)
6579     (setq gnus-newsgroup-unreads
6580           (gnus-intersection gnus-newsgroup-unreads gnus-newsgroup-limit))
6581     (if all
6582         (setq gnus-newsgroup-dormant nil
6583               gnus-newsgroup-marked nil
6584               gnus-newsgroup-reads
6585               (nconc
6586                (mapcar (lambda (n) (cons n gnus-catchup-mark)) articles)
6587                gnus-newsgroup-reads))
6588       (while (setq article (pop articles))
6589         (unless (or (memq article gnus-newsgroup-dormant)
6590                     (memq article gnus-newsgroup-marked))
6591           (push (cons article gnus-catchup-mark) gnus-newsgroup-reads))))))
6592
6593 (defun gnus-summary-limit (articles &optional pop)
6594   (if pop
6595       ;; We pop the previous limit off the stack and use that.
6596       (setq articles (car gnus-newsgroup-limits)
6597             gnus-newsgroup-limits (cdr gnus-newsgroup-limits))
6598     ;; We use the new limit, so we push the old limit on the stack.
6599     (push gnus-newsgroup-limit gnus-newsgroup-limits))
6600   ;; Set the limit.
6601   (setq gnus-newsgroup-limit articles)
6602   (let ((total (length gnus-newsgroup-data))
6603         (data (gnus-data-find-list (gnus-summary-article-number)))
6604         (gnus-summary-mark-below nil)   ; Inhibit this.
6605         found)
6606     ;; This will do all the work of generating the new summary buffer
6607     ;; according to the new limit.
6608     (gnus-summary-prepare)
6609     ;; Hide any threads, possibly.
6610     (and gnus-show-threads
6611          gnus-thread-hide-subtree
6612          (gnus-summary-hide-all-threads))
6613     ;; Try to return to the article you were at, or one in the
6614     ;; neighborhood.
6615     (when data
6616       ;; We try to find some article after the current one.
6617       (while data
6618         (when (gnus-summary-goto-subject (gnus-data-number (car data)) nil t)
6619           (setq data nil
6620                 found t))
6621         (setq data (cdr data))))
6622     (unless found
6623       ;; If there is no data, that means that we were after the last
6624       ;; article.  The same goes when we can't find any articles
6625       ;; after the current one.
6626       (goto-char (point-max))
6627       (gnus-summary-find-prev))
6628     (gnus-set-mode-line 'summary)
6629     ;; We return how many articles were removed from the summary
6630     ;; buffer as a result of the new limit.
6631     (- total (length gnus-newsgroup-data))))
6632
6633 (defsubst gnus-invisible-cut-children (threads)
6634   (let ((num 0))
6635     (while threads
6636       (when (memq (mail-header-number (caar threads)) gnus-newsgroup-limit)
6637         (incf num))
6638       (pop threads))
6639     (< num 2)))
6640
6641 (defsubst gnus-cut-thread (thread)
6642   "Go forwards in the thread until we find an article that we want to display."
6643   (when (or (eq gnus-fetch-old-headers 'some)
6644             (eq gnus-fetch-old-headers 'invisible)
6645             (numberp gnus-fetch-old-headers)
6646             (eq gnus-build-sparse-threads 'some)
6647             (eq gnus-build-sparse-threads 'more))
6648     ;; Deal with old-fetched headers and sparse threads.
6649     (while (and
6650             thread
6651             (or
6652              (gnus-summary-article-sparse-p (mail-header-number (car thread)))
6653              (gnus-summary-article-ancient-p
6654               (mail-header-number (car thread))))
6655             (if (or (<= (length (cdr thread)) 1)
6656                     (eq gnus-fetch-old-headers 'invisible))
6657                 (setq gnus-newsgroup-limit
6658                       (delq (mail-header-number (car thread))
6659                             gnus-newsgroup-limit)
6660                       thread (cadr thread))
6661               (when (gnus-invisible-cut-children (cdr thread))
6662                 (let ((th (cdr thread)))
6663                   (while th
6664                     (if (memq (mail-header-number (caar th))
6665                               gnus-newsgroup-limit)
6666                         (setq thread (car th)
6667                               th nil)
6668                       (setq th (cdr th))))))))))
6669   thread)
6670
6671 (defun gnus-cut-threads (threads)
6672   "Cut off all uninteresting articles from the beginning of threads."
6673   (when (or (eq gnus-fetch-old-headers 'some)
6674             (eq gnus-fetch-old-headers 'invisible)
6675             (numberp gnus-fetch-old-headers)
6676             (eq gnus-build-sparse-threads 'some)
6677             (eq gnus-build-sparse-threads 'more))
6678     (let ((th threads))
6679       (while th
6680         (setcar th (gnus-cut-thread (car th)))
6681         (setq th (cdr th)))))
6682   ;; Remove nixed out threads.
6683   (delq nil threads))
6684
6685 (defun gnus-summary-initial-limit (&optional show-if-empty)
6686   "Figure out what the initial limit is supposed to be on group entry.
6687 This entails weeding out unwanted dormants, low-scored articles,
6688 fetch-old-headers verbiage, and so on."
6689   ;; Most groups have nothing to remove.
6690   (if (or gnus-inhibit-limiting
6691           (and (null gnus-newsgroup-dormant)
6692                (not (eq gnus-fetch-old-headers 'some))
6693                (not (numberp gnus-fetch-old-headers))
6694                (not (eq gnus-fetch-old-headers 'invisible))
6695                (null gnus-summary-expunge-below)
6696                (not (eq gnus-build-sparse-threads 'some))
6697                (not (eq gnus-build-sparse-threads 'more))
6698                (null gnus-thread-expunge-below)
6699                (not gnus-use-nocem)))
6700       ()                                ; Do nothing.
6701     (push gnus-newsgroup-limit gnus-newsgroup-limits)
6702     (setq gnus-newsgroup-limit nil)
6703     (mapatoms
6704      (lambda (node)
6705        (unless (car (symbol-value node))
6706          ;; These threads have no parents -- they are roots.
6707          (let ((nodes (cdr (symbol-value node)))
6708                thread)
6709            (while nodes
6710              (if (and gnus-thread-expunge-below
6711                       (< (gnus-thread-total-score (car nodes))
6712                          gnus-thread-expunge-below))
6713                  (gnus-expunge-thread (pop nodes))
6714                (setq thread (pop nodes))
6715                (gnus-summary-limit-children thread))))))
6716      gnus-newsgroup-dependencies)
6717     ;; If this limitation resulted in an empty group, we might
6718     ;; pop the previous limit and use it instead.
6719     (when (and (not gnus-newsgroup-limit)
6720                show-if-empty)
6721       (setq gnus-newsgroup-limit (pop gnus-newsgroup-limits)))
6722     gnus-newsgroup-limit))
6723
6724 (defun gnus-summary-limit-children (thread)
6725   "Return 1 if this subthread is visible and 0 if it is not."
6726   ;; First we get the number of visible children to this thread.  This
6727   ;; is done by recursing down the thread using this function, so this
6728   ;; will really go down to a leaf article first, before slowly
6729   ;; working its way up towards the root.
6730   (when thread
6731     (let ((children
6732            (if (cdr thread)
6733                (apply '+ (mapcar 'gnus-summary-limit-children
6734                                  (cdr thread)))
6735              0))
6736           (number (mail-header-number (car thread)))
6737           score)
6738       (if (and
6739            (not (memq number gnus-newsgroup-marked))
6740            (or
6741             ;; If this article is dormant and has absolutely no visible
6742             ;; children, then this article isn't visible.
6743             (and (memq number gnus-newsgroup-dormant)
6744                  (zerop children))
6745             ;; If this is "fetch-old-headered" and there is no
6746             ;; visible children, then we don't want this article.
6747             (and (or (eq gnus-fetch-old-headers 'some)
6748                      (numberp gnus-fetch-old-headers))
6749                  (gnus-summary-article-ancient-p number)
6750                  (zerop children))
6751             ;; If this is "fetch-old-headered" and `invisible', then
6752             ;; we don't want this article.
6753             (and (eq gnus-fetch-old-headers 'invisible)
6754                  (gnus-summary-article-ancient-p number))
6755             ;; If this is a sparsely inserted article with no children,
6756             ;; we don't want it.
6757             (and (eq gnus-build-sparse-threads 'some)
6758                  (gnus-summary-article-sparse-p number)
6759                  (zerop children))
6760             ;; If we use expunging, and this article is really
6761             ;; low-scored, then we don't want this article.
6762             (when (and gnus-summary-expunge-below
6763                        (< (setq score
6764                                 (or (cdr (assq number gnus-newsgroup-scored))
6765                                     gnus-summary-default-score))
6766                           gnus-summary-expunge-below))
6767               ;; We increase the expunge-tally here, but that has
6768               ;; nothing to do with the limits, really.
6769               (incf gnus-newsgroup-expunged-tally)
6770               ;; We also mark as read here, if that's wanted.
6771               (when (and gnus-summary-mark-below
6772                          (< score gnus-summary-mark-below))
6773                 (setq gnus-newsgroup-unreads
6774                       (delq number gnus-newsgroup-unreads))
6775                 (if gnus-newsgroup-auto-expire
6776                     (push number gnus-newsgroup-expirable)
6777                   (push (cons number gnus-low-score-mark)
6778                         gnus-newsgroup-reads)))
6779               t)
6780             ;; Check NoCeM things.
6781             (if (and gnus-use-nocem
6782                      (gnus-nocem-unwanted-article-p
6783                       (mail-header-id (car thread))))
6784                 (progn
6785                   (setq gnus-newsgroup-unreads
6786                         (delq number gnus-newsgroup-unreads))
6787                   t))))
6788           ;; Nope, invisible article.
6789           0
6790         ;; Ok, this article is to be visible, so we add it to the limit
6791         ;; and return 1.
6792         (push number gnus-newsgroup-limit)
6793         1))))
6794
6795 (defun gnus-expunge-thread (thread)
6796   "Mark all articles in THREAD as read."
6797   (let* ((number (mail-header-number (car thread))))
6798     (incf gnus-newsgroup-expunged-tally)
6799     ;; We also mark as read here, if that's wanted.
6800     (setq gnus-newsgroup-unreads
6801           (delq number gnus-newsgroup-unreads))
6802     (if gnus-newsgroup-auto-expire
6803         (push number gnus-newsgroup-expirable)
6804       (push (cons number gnus-low-score-mark)
6805             gnus-newsgroup-reads)))
6806   ;; Go recursively through all subthreads.
6807   (mapcar 'gnus-expunge-thread (cdr thread)))
6808
6809 ;; Summary article oriented commands
6810
6811 (defun gnus-summary-refer-parent-article (n)
6812   "Refer parent article N times.
6813 If N is negative, go to ancestor -N instead.
6814 The difference between N and the number of articles fetched is returned."
6815   (interactive "p")
6816   (let ((skip 1)
6817         error header ref)
6818     (when (not (natnump n))
6819       (setq skip (abs n)
6820             n 1))
6821     (while (and (> n 0)
6822                 (not error))
6823       (setq header (gnus-summary-article-header))
6824       (if (and (eq (mail-header-number header)
6825                    (cdr gnus-article-current))
6826                (equal gnus-newsgroup-name
6827                       (car gnus-article-current)))
6828           ;; If we try to find the parent of the currently
6829           ;; displayed article, then we take a look at the actual
6830           ;; References header, since this is slightly more
6831           ;; reliable than the References field we got from the
6832           ;; server.
6833           (save-excursion
6834             (set-buffer gnus-original-article-buffer)
6835             (nnheader-narrow-to-headers)
6836             (unless (setq ref (message-fetch-field "references"))
6837               (setq ref (message-fetch-field "in-reply-to")))
6838             (widen))
6839         (setq ref
6840               ;; It's not the current article, so we take a bet on
6841               ;; the value we got from the server.
6842               (mail-header-references header)))
6843       (if (and ref
6844                (not (equal ref "")))
6845           (unless (gnus-summary-refer-article (gnus-parent-id ref skip))
6846             (gnus-message 1 "Couldn't find parent"))
6847         (gnus-message 1 "No references in article %d"
6848                       (gnus-summary-article-number))
6849         (setq error t))
6850       (decf n))
6851     (gnus-summary-position-point)
6852     n))
6853
6854 (defun gnus-summary-refer-references ()
6855   "Fetch all articles mentioned in the References header.
6856 Return the number of articles fetched."
6857   (interactive)
6858   (let ((ref (mail-header-references (gnus-summary-article-header)))
6859         (current (gnus-summary-article-number))
6860         (n 0))
6861     (if (or (not ref)
6862             (equal ref ""))
6863         (error "No References in the current article")
6864       ;; For each Message-ID in the References header...
6865       (while (string-match "<[^>]*>" ref)
6866         (incf n)
6867         ;; ... fetch that article.
6868         (gnus-summary-refer-article
6869          (prog1 (match-string 0 ref)
6870            (setq ref (substring ref (match-end 0))))))
6871       (gnus-summary-goto-subject current)
6872       (gnus-summary-position-point)
6873       n)))
6874
6875 (defun gnus-summary-refer-thread (&optional limit)
6876   "Fetch all articles in the current thread.
6877 If LIMIT (the numerical prefix), fetch that many old headers instead
6878 of what's specified by the `gnus-refer-thread-limit' variable."
6879   (interactive "P")
6880   (let ((id (mail-header-id (gnus-summary-article-header)))
6881         (limit (if limit (prefix-numeric-value limit)
6882                  gnus-refer-thread-limit)))
6883     ;; We want to fetch LIMIT *old* headers, but we also have to
6884     ;; re-fetch all the headers in the current buffer, because many of
6885     ;; them may be undisplayed.  So we adjust LIMIT.
6886     (when (numberp limit)
6887       (incf limit (- gnus-newsgroup-end gnus-newsgroup-begin)))
6888     (unless (eq gnus-fetch-old-headers 'invisible)
6889       (gnus-message 5 "Fetching headers for %s..." gnus-newsgroup-name)
6890       ;; Retrieve the headers and read them in.
6891       (if (eq (gnus-retrieve-headers
6892                (list gnus-newsgroup-end) gnus-newsgroup-name limit)
6893               'nov)
6894           (gnus-build-all-threads)
6895         (error "Can't fetch thread from backends that don't support NOV"))
6896       (gnus-message 5 "Fetching headers for %s...done" gnus-newsgroup-name))
6897     (gnus-summary-limit-include-thread id)))
6898
6899 (defun gnus-summary-refer-article (message-id)
6900   "Fetch an article specified by MESSAGE-ID."
6901   (interactive "sMessage-ID: ")
6902   (when (and (stringp message-id)
6903              (not (zerop (length message-id))))
6904     ;; Construct the correct Message-ID if necessary.
6905     ;; Suggested by tale@pawl.rpi.edu.
6906     (unless (string-match "^<" message-id)
6907       (setq message-id (concat "<" message-id)))
6908     (unless (string-match ">$" message-id)
6909       (setq message-id (concat message-id ">")))
6910     (let* ((header (gnus-id-to-header message-id))
6911            (sparse (and header
6912                         (gnus-summary-article-sparse-p
6913                          (mail-header-number header))
6914                         (memq (mail-header-number header)
6915                               gnus-newsgroup-limit)))
6916            number)
6917       (cond
6918        ;; If the article is present in the buffer we just go to it.
6919        ((and header
6920              (or (not (gnus-summary-article-sparse-p
6921                        (mail-header-number header)))
6922                  sparse))
6923         (prog1
6924             (gnus-summary-goto-article
6925              (mail-header-number header) nil t)
6926           (when sparse
6927             (gnus-summary-update-article (mail-header-number header)))))
6928        (t
6929         ;; We fetch the article.
6930         (catch 'found
6931           (dolist (gnus-override-method (gnus-refer-article-methods))
6932             (gnus-check-server gnus-override-method)
6933             ;; Fetch the header, and display the article.
6934             (when (setq number (gnus-summary-insert-subject message-id))
6935               (gnus-summary-select-article nil nil nil number)
6936               (throw 'found t)))
6937           (gnus-message 3 "Couldn't fetch article %s" message-id)))))))
6938
6939 (defun gnus-refer-article-methods ()
6940   "Return a list of referrable methods."
6941   (cond
6942    ;; No method, so we default to current and native.
6943    ((null gnus-refer-article-method)
6944     (list gnus-current-select-method gnus-select-method))
6945    ;; Current.
6946    ((eq 'current gnus-refer-article-method)
6947     (list gnus-current-select-method))
6948    ;; List of select methods.
6949    ((not (and (symbolp (car gnus-refer-article-method))
6950               (assq (car gnus-refer-article-method) nnoo-definition-alist)))
6951     (let (out)
6952       (dolist (method gnus-refer-article-method)
6953         (push (if (eq 'current method)
6954                   gnus-current-select-method
6955                 method)
6956               out))
6957       (nreverse out)))
6958    ;; One single select method.
6959    (t
6960     (list gnus-refer-article-method))))
6961
6962 (defun gnus-summary-edit-parameters ()
6963   "Edit the group parameters of the current group."
6964   (interactive)
6965   (gnus-group-edit-group gnus-newsgroup-name 'params))
6966
6967 (defun gnus-summary-customize-parameters ()
6968   "Customize the group parameters of the current group."
6969   (interactive)
6970   (gnus-group-customize gnus-newsgroup-name))
6971
6972 (defun gnus-summary-enter-digest-group (&optional force)
6973   "Enter an nndoc group based on the current article.
6974 If FORCE, force a digest interpretation.  If not, try
6975 to guess what the document format is."
6976   (interactive "P")
6977   (let ((conf gnus-current-window-configuration))
6978     (save-excursion
6979       (gnus-summary-select-article))
6980     (setq gnus-current-window-configuration conf)
6981     (let* ((name (format "%s-%d"
6982                          (gnus-group-prefixed-name
6983                           gnus-newsgroup-name (list 'nndoc ""))
6984                          (save-excursion
6985                            (set-buffer gnus-summary-buffer)
6986                            gnus-current-article)))
6987            (ogroup gnus-newsgroup-name)
6988            (params (append (gnus-info-params (gnus-get-info ogroup))
6989                            (list (cons 'to-group ogroup))
6990                            (list (cons 'save-article-group ogroup))))
6991            (case-fold-search t)
6992            (buf (current-buffer))
6993            dig to-address)
6994       (save-excursion
6995         (set-buffer gnus-original-article-buffer)
6996         ;; Have the digest group inherit the main mail address of
6997         ;; the parent article.
6998         (when (setq to-address (or (message-fetch-field "reply-to")
6999                                    (message-fetch-field "from")))
7000           (setq params (append
7001                         (list (cons 'to-address
7002                                     (funcall gnus-decode-encoded-word-function
7003                                              to-address))))))
7004         (setq dig (nnheader-set-temp-buffer " *gnus digest buffer*"))
7005         (insert-buffer-substring gnus-original-article-buffer)
7006         ;; Remove lines that may lead nndoc to misinterpret the
7007         ;; document type.
7008         (narrow-to-region
7009          (goto-char (point-min))
7010          (or (search-forward "\n\n" nil t) (point)))
7011         (goto-char (point-min))
7012         (delete-matching-lines "^Path:\\|^From ")
7013         (widen))
7014       (unwind-protect
7015           (if (let ((gnus-newsgroup-ephemeral-charset gnus-newsgroup-charset)
7016                     (gnus-newsgroup-ephemeral-ignored-charsets
7017                      gnus-newsgroup-ignored-charsets))
7018                 (gnus-group-read-ephemeral-group
7019                  name `(nndoc ,name (nndoc-address ,(get-buffer dig))
7020                               (nndoc-article-type
7021                                ,(if force 'mbox 'guess))) t))
7022               ;; Make all postings to this group go to the parent group.
7023               (nconc (gnus-info-params (gnus-get-info name))
7024                      params)
7025             ;; Couldn't select this doc group.
7026             (switch-to-buffer buf)
7027             (gnus-set-global-variables)
7028             (gnus-configure-windows 'summary)
7029             (gnus-message 3 "Article couldn't be entered?"))
7030         (kill-buffer dig)))))
7031
7032 (defun gnus-summary-read-document (n)
7033   "Open a new group based on the current article(s).
7034 This will allow you to read digests and other similar
7035 documents as newsgroups.
7036 Obeys the standard process/prefix convention."
7037   (interactive "P")
7038   (let* ((articles (gnus-summary-work-articles n))
7039          (ogroup gnus-newsgroup-name)
7040          (params (append (gnus-info-params (gnus-get-info ogroup))
7041                          (list (cons 'to-group ogroup))))
7042          article group egroup groups vgroup)
7043     (while (setq article (pop articles))
7044       (setq group (format "%s-%d" gnus-newsgroup-name article))
7045       (gnus-summary-remove-process-mark article)
7046       (when (gnus-summary-display-article article)
7047         (save-excursion
7048           (with-temp-buffer
7049             (insert-buffer-substring gnus-original-article-buffer)
7050             ;; Remove some headers that may lead nndoc to make
7051             ;; the wrong guess.
7052             (message-narrow-to-head)
7053             (goto-char (point-min))
7054             (delete-matching-lines "^\\(Path\\):\\|^From ")
7055             (widen)
7056             (if (setq egroup
7057                       (gnus-group-read-ephemeral-group
7058                        group `(nndoc ,group (nndoc-address ,(current-buffer))
7059                                      (nndoc-article-type guess))
7060                        t nil t))
7061                 (progn
7062                   ;; Make all postings to this group go to the parent group.
7063                   (nconc (gnus-info-params (gnus-get-info egroup))
7064                          params)
7065                   (push egroup groups))
7066               ;; Couldn't select this doc group.
7067               (gnus-error 3 "Article couldn't be entered"))))))
7068     ;; Now we have selected all the documents.
7069     (cond
7070      ((not groups)
7071       (error "None of the articles could be interpreted as documents"))
7072      ((gnus-group-read-ephemeral-group
7073        (setq vgroup (format
7074                      "nnvirtual:%s-%s" gnus-newsgroup-name
7075                      (format-time-string "%Y%m%dT%H%M%S" (current-time))))
7076        `(nnvirtual ,vgroup (nnvirtual-component-groups ,groups))
7077        t
7078        (cons (current-buffer) 'summary)))
7079      (t
7080       (error "Couldn't select virtual nndoc group")))))
7081
7082 (defun gnus-summary-isearch-article (&optional regexp-p)
7083   "Do incremental search forward on the current article.
7084 If REGEXP-P (the prefix) is non-nil, do regexp isearch."
7085   (interactive "P")
7086   (gnus-summary-select-article)
7087   (gnus-configure-windows 'article)
7088   (gnus-eval-in-buffer-window gnus-article-buffer
7089     (save-restriction
7090       (widen)
7091       (isearch-forward regexp-p))))
7092
7093 (defun gnus-summary-search-article-forward (regexp &optional backward)
7094   "Search for an article containing REGEXP forward.
7095 If BACKWARD, search backward instead."
7096   (interactive
7097    (list (read-string
7098           (format "Search article %s (regexp%s): "
7099                   (if current-prefix-arg "backward" "forward")
7100                   (if gnus-last-search-regexp
7101                       (concat ", default " gnus-last-search-regexp)
7102                     "")))
7103          current-prefix-arg))
7104   (if (string-equal regexp "")
7105       (setq regexp (or gnus-last-search-regexp ""))
7106     (setq gnus-last-search-regexp regexp))
7107   (if (gnus-summary-search-article regexp backward)
7108       (gnus-summary-show-thread)
7109     (error "Search failed: \"%s\"" regexp)))
7110
7111 (defun gnus-summary-search-article-backward (regexp)
7112   "Search for an article containing REGEXP backward."
7113   (interactive
7114    (list (read-string
7115           (format "Search article backward (regexp%s): "
7116                   (if gnus-last-search-regexp
7117                       (concat ", default " gnus-last-search-regexp)
7118                     "")))))
7119   (gnus-summary-search-article-forward regexp 'backward))
7120
7121 (defun gnus-summary-search-article (regexp &optional backward)
7122   "Search for an article containing REGEXP.
7123 Optional argument BACKWARD means do search for backward.
7124 `gnus-select-article-hook' is not called during the search."
7125   ;; We have to require this here to make sure that the following
7126   ;; dynamic binding isn't shadowed by autoloading.
7127   (require 'gnus-async)
7128   (require 'gnus-art)
7129   (let ((gnus-select-article-hook nil)  ;Disable hook.
7130         (gnus-article-prepare-hook nil)
7131         (gnus-mark-article-hook nil)    ;Inhibit marking as read.
7132         (gnus-use-article-prefetch nil)
7133         (gnus-xmas-force-redisplay nil) ;Inhibit XEmacs redisplay.
7134         (gnus-use-trees nil)            ;Inhibit updating tree buffer.
7135         (sum (current-buffer))
7136         (gnus-display-mime-function nil)
7137         (found nil)
7138         point)
7139     (gnus-save-hidden-threads
7140       (gnus-summary-select-article)
7141       (set-buffer gnus-article-buffer)
7142       (goto-char (window-point (get-buffer-window (current-buffer))))
7143       (when backward
7144         (forward-line -1))
7145       (while (not found)
7146         (gnus-message 7 "Searching article: %d..." (cdr gnus-article-current))
7147         (if (if backward
7148                 (re-search-backward regexp nil t)
7149               (re-search-forward regexp nil t))
7150             ;; We found the regexp.
7151             (progn
7152               (setq found 'found)
7153               (beginning-of-line)
7154               (set-window-start
7155                (get-buffer-window (current-buffer))
7156                (point))
7157               (forward-line 1)
7158               (set-window-point
7159                (get-buffer-window (current-buffer))
7160                (point))
7161               (set-buffer sum)
7162               (setq point (point)))
7163           ;; We didn't find it, so we go to the next article.
7164           (set-buffer sum)
7165           (setq found 'not)
7166           (while (eq found 'not)
7167             (if (not (if backward (gnus-summary-find-prev)
7168                        (gnus-summary-find-next)))
7169                 ;; No more articles.
7170                 (setq found t)
7171               ;; Select the next article and adjust point.
7172               (unless (gnus-summary-article-sparse-p
7173                        (gnus-summary-article-number))
7174                 (setq found nil)
7175                 (gnus-summary-select-article)
7176                 (set-buffer gnus-article-buffer)
7177                 (widen)
7178                 (goto-char (if backward (point-max) (point-min))))))))
7179       (gnus-message 7 ""))
7180     ;; Return whether we found the regexp.
7181     (when (eq found 'found)
7182       (goto-char point)
7183       (gnus-summary-show-thread)
7184       (gnus-summary-goto-subject gnus-current-article)
7185       (gnus-summary-position-point)
7186       t)))
7187
7188 (defun gnus-summary-find-matching (header regexp &optional backward unread
7189                                           not-case-fold)
7190   "Return a list of all articles that match REGEXP on HEADER.
7191 The search stars on the current article and goes forwards unless
7192 BACKWARD is non-nil.  If BACKWARD is `all', do all articles.
7193 If UNREAD is non-nil, only unread articles will
7194 be taken into consideration.  If NOT-CASE-FOLD, case won't be folded
7195 in the comparisons."
7196   (let ((data (if (eq backward 'all) gnus-newsgroup-data
7197                 (gnus-data-find-list
7198                  (gnus-summary-article-number) (gnus-data-list backward))))
7199         (case-fold-search (not not-case-fold))
7200         articles d func)
7201     (if (consp header)
7202         (if (eq (car header) 'extra)
7203             (setq func
7204                   `(lambda (h)
7205                      (or (cdr (assq ',(cdr header) (mail-header-extra h)))
7206                          "")))
7207           (error "%s is an invalid header" header))
7208       (unless (fboundp (intern (concat "mail-header-" header)))
7209         (error "%s is not a valid header" header))
7210       (setq func `(lambda (h) (,(intern (concat "mail-header-" header)) h))))
7211     (while data
7212       (setq d (car data))
7213       (and (or (not unread)             ; We want all articles...
7214                (gnus-data-unread-p d))  ; Or just unreads.
7215            (vectorp (gnus-data-header d)) ; It's not a pseudo.
7216            (string-match regexp (funcall func (gnus-data-header d))) ; Match.
7217            (push (gnus-data-number d) articles)) ; Success!
7218       (setq data (cdr data)))
7219     (nreverse articles)))
7220
7221 (defun gnus-summary-execute-command (header regexp command &optional backward)
7222   "Search forward for an article whose HEADER matches REGEXP and execute COMMAND.
7223 If HEADER is an empty string (or nil), the match is done on the entire
7224 article.  If BACKWARD (the prefix) is non-nil, search backward instead."
7225   (interactive
7226    (list (let ((completion-ignore-case t))
7227            (completing-read
7228             "Header name: "
7229             (mapcar (lambda (string) (list string))
7230                     '("Number" "Subject" "From" "Lines" "Date"
7231                       "Message-ID" "Xref" "References" "Body"))
7232             nil 'require-match))
7233          (read-string "Regexp: ")
7234          (read-key-sequence "Command: ")
7235          current-prefix-arg))
7236   (when (equal header "Body")
7237     (setq header ""))
7238   ;; Hidden thread subtrees must be searched as well.
7239   (gnus-summary-show-all-threads)
7240   ;; We don't want to change current point nor window configuration.
7241   (save-excursion
7242     (save-window-excursion
7243       (gnus-message 6 "Executing %s..." (key-description command))
7244       ;; We'd like to execute COMMAND interactively so as to give arguments.
7245       (gnus-execute header regexp
7246                     `(call-interactively ',(key-binding command))
7247                     backward)
7248       (gnus-message 6 "Executing %s...done" (key-description command)))))
7249
7250 (defun gnus-summary-beginning-of-article ()
7251   "Scroll the article back to the beginning."
7252   (interactive)
7253   (gnus-summary-select-article)
7254   (gnus-configure-windows 'article)
7255   (gnus-eval-in-buffer-window gnus-article-buffer
7256     (widen)
7257     (goto-char (point-min))
7258     (when gnus-page-broken
7259       (gnus-narrow-to-page))))
7260
7261 (defun gnus-summary-end-of-article ()
7262   "Scroll to the end of the article."
7263   (interactive)
7264   (gnus-summary-select-article)
7265   (gnus-configure-windows 'article)
7266   (gnus-eval-in-buffer-window gnus-article-buffer
7267     (widen)
7268     (goto-char (point-max))
7269     (recenter -3)
7270     (when gnus-page-broken
7271       (gnus-narrow-to-page))))
7272
7273 (defun gnus-summary-print-article (&optional filename n)
7274   "Generate and print a PostScript image of the N next (mail) articles.
7275
7276 If N is negative, print the N previous articles.  If N is nil and articles
7277 have been marked with the process mark, print these instead.
7278
7279 If the optional first argument FILENAME is nil, send the image to the
7280 printer.  If FILENAME is a string, save the PostScript image in a file with
7281 that name.  If FILENAME is a number, prompt the user for the name of the file
7282 to save in."
7283   (interactive (list (ps-print-preprint current-prefix-arg)
7284                      current-prefix-arg))
7285   (dolist (article (gnus-summary-work-articles n))
7286     (gnus-summary-select-article nil nil 'pseudo article)
7287     (gnus-eval-in-buffer-window gnus-article-buffer
7288       (let ((buffer (generate-new-buffer " *print*")))
7289         (unwind-protect
7290             (progn
7291               (copy-to-buffer buffer (point-min) (point-max))
7292               (set-buffer buffer)
7293               (gnus-article-delete-invisible-text)
7294               (let ((ps-left-header
7295                      (list
7296                       (concat "("
7297                               (mail-header-subject gnus-current-headers) ")")
7298                       (concat "("
7299                               (mail-header-from gnus-current-headers) ")")))
7300                     (ps-right-header
7301                      (list
7302                       "/pagenumberstring load"
7303                       (concat "("
7304                               (mail-header-date gnus-current-headers) ")"))))
7305                 (gnus-run-hooks 'gnus-ps-print-hook)
7306                 (save-excursion
7307                   (ps-print-buffer-with-faces filename))))
7308           (kill-buffer buffer))))))
7309
7310 (defun gnus-summary-show-article (&optional arg)
7311   "Force re-fetching of the current article.
7312 If ARG (the prefix) is a number, show the article with the charset
7313 defined in `gnus-summary-show-article-charset-alist', or the charset
7314 inputed.
7315 If ARG (the prefix) is non-nil and not a number, show the raw article
7316 without any article massaging functions being run."
7317   (interactive "P")
7318   (cond
7319    ((numberp arg)
7320     (let ((gnus-newsgroup-charset
7321            (or (cdr (assq arg gnus-summary-show-article-charset-alist))
7322                (read-coding-system "Charset: ")))
7323           (gnus-newsgroup-ignored-charsets 'gnus-all))
7324       (gnus-summary-select-article nil 'force)))
7325    ((not arg)
7326     ;; Select the article the normal way.
7327     (gnus-summary-select-article nil 'force))
7328    (t
7329     ;; We have to require this here to make sure that the following
7330     ;; dynamic binding isn't shadowed by autoloading.
7331     (require 'gnus-async)
7332     (require 'gnus-art)
7333     ;; Bind the article treatment functions to nil.
7334     (let ((gnus-have-all-headers t)
7335           gnus-article-prepare-hook
7336           gnus-article-decode-hook
7337           gnus-display-mime-function
7338           gnus-break-pages)
7339       ;; Destroy any MIME parts.
7340       (when (gnus-buffer-live-p gnus-article-buffer)
7341         (save-excursion
7342           (set-buffer gnus-article-buffer)
7343           (mm-destroy-parts gnus-article-mime-handles)
7344           ;; Set it to nil for safety reason.
7345           (setq gnus-article-mime-handle-alist nil)
7346           (setq gnus-article-mime-handles nil)))
7347       (gnus-summary-select-article nil 'force))))
7348   (gnus-summary-goto-subject gnus-current-article)
7349   (gnus-summary-position-point))
7350
7351 (defun gnus-summary-verbose-headers (&optional arg)
7352   "Toggle permanent full header display.
7353 If ARG is a positive number, turn header display on.
7354 If ARG is a negative number, turn header display off."
7355   (interactive "P")
7356   (setq gnus-show-all-headers
7357         (cond ((or (not (numberp arg))
7358                    (zerop arg))
7359                (not gnus-show-all-headers))
7360               ((natnump arg)
7361                t)))
7362   (gnus-summary-show-article))
7363
7364 (defun gnus-summary-toggle-header (&optional arg)
7365   "Show the headers if they are hidden, or hide them if they are shown.
7366 If ARG is a positive number, show the entire header.
7367 If ARG is a negative number, hide the unwanted header lines."
7368   (interactive "P")
7369   (save-excursion
7370     (set-buffer gnus-article-buffer)
7371     (save-restriction
7372       (let* ((buffer-read-only nil)
7373              (inhibit-point-motion-hooks t)
7374              hidden e)
7375         (setq hidden
7376               (if (numberp arg)
7377                   (>= arg 0)
7378                 (save-restriction
7379                   (article-narrow-to-head)
7380                   (gnus-article-hidden-text-p 'headers))))
7381         (goto-char (point-min))
7382         (when (search-forward "\n\n" nil t)
7383           (delete-region (point-min) (1- (point))))
7384         (goto-char (point-min))
7385         (save-excursion
7386           (set-buffer gnus-original-article-buffer)
7387           (goto-char (point-min))
7388           (setq e (1- (or (search-forward "\n\n" nil t) (point-max)))))
7389         (insert-buffer-substring gnus-original-article-buffer 1 e)
7390         (save-restriction
7391           (narrow-to-region (point-min) (point))
7392           (article-decode-encoded-words)
7393           (if  hidden
7394               (let ((gnus-treat-hide-headers nil)
7395                     (gnus-treat-hide-boring-headers nil))
7396                 (setq gnus-article-wash-types
7397                       (delq 'headers gnus-article-wash-types))
7398                 (gnus-treat-article 'head))
7399             (gnus-treat-article 'head)))
7400         (gnus-set-mode-line 'article)))))
7401
7402 (defun gnus-summary-show-all-headers ()
7403   "Make all header lines visible."
7404   (interactive)
7405   (gnus-article-show-all-headers))
7406
7407 (defun gnus-summary-caesar-message (&optional arg)
7408   "Caesar rotate the current article by 13.
7409 The numerical prefix specifies how many places to rotate each letter
7410 forward."
7411   (interactive "P")
7412   (gnus-summary-select-article)
7413   (let ((mail-header-separator ""))
7414     (gnus-eval-in-buffer-window gnus-article-buffer
7415       (save-restriction
7416         (widen)
7417         (let ((start (window-start))
7418               buffer-read-only)
7419           (message-caesar-buffer-body arg)
7420           (set-window-start (get-buffer-window (current-buffer)) start))))))
7421
7422 (defun gnus-summary-stop-page-breaking ()
7423   "Stop page breaking in the current article."
7424   (interactive)
7425   (gnus-summary-select-article)
7426   (gnus-eval-in-buffer-window gnus-article-buffer
7427     (widen)
7428     (when (gnus-visual-p 'page-marker)
7429       (let ((buffer-read-only nil))
7430         (gnus-remove-text-with-property 'gnus-prev)
7431         (gnus-remove-text-with-property 'gnus-next))
7432       (setq gnus-page-broken nil))))
7433
7434 (defun gnus-summary-move-article (&optional n to-newsgroup
7435                                             select-method action)
7436   "Move the current article to a different newsgroup.
7437 If N is a positive number, move the N next articles.
7438 If N is a negative number, move the N previous articles.
7439 If N is nil and any articles have been marked with the process mark,
7440 move those articles instead.
7441 If TO-NEWSGROUP is string, do not prompt for a newsgroup to move to.
7442 If SELECT-METHOD is non-nil, do not move to a specific newsgroup, but
7443 re-spool using this method.
7444
7445 For this function to work, both the current newsgroup and the
7446 newsgroup that you want to move to have to support the `request-move'
7447 and `request-accept' functions.
7448
7449 ACTION can be either `move' (the default), `crosspost' or `copy'."
7450   (interactive "P")
7451   (unless action
7452     (setq action 'move))
7453   ;; Disable marking as read.
7454   (let (gnus-mark-article-hook)
7455     (save-window-excursion
7456       (gnus-summary-select-article)))
7457   ;; Check whether the source group supports the required functions.
7458   (cond ((and (eq action 'move)
7459               (not (gnus-check-backend-function
7460                     'request-move-article gnus-newsgroup-name)))
7461          (error "The current group does not support article moving"))
7462         ((and (eq action 'crosspost)
7463               (not (gnus-check-backend-function
7464                     'request-replace-article gnus-newsgroup-name)))
7465          (error "The current group does not support article editing")))
7466   (let ((articles (gnus-summary-work-articles n))
7467         (prefix (if (gnus-check-backend-function
7468                     'request-move-article gnus-newsgroup-name)
7469                     (gnus-group-real-prefix gnus-newsgroup-name)
7470                   ""))
7471         (names '((move "Move" "Moving")
7472                  (copy "Copy" "Copying")
7473                  (crosspost "Crosspost" "Crossposting")))
7474         (copy-buf (save-excursion
7475                     (nnheader-set-temp-buffer " *copy article*")))
7476         art-group to-method new-xref article to-groups)
7477     (unless (assq action names)
7478       (error "Unknown action %s" action))
7479     ;; Read the newsgroup name.
7480     (when (and (not to-newsgroup)
7481                (not select-method))
7482       (setq to-newsgroup
7483             (gnus-read-move-group-name
7484              (cadr (assq action names))
7485              (symbol-value (intern (format "gnus-current-%s-group" action)))
7486              articles prefix))
7487       (set (intern (format "gnus-current-%s-group" action)) to-newsgroup))
7488     (setq to-method (or select-method
7489                         (gnus-server-to-method
7490                          (gnus-group-method to-newsgroup))))
7491     ;; Check the method we are to move this article to...
7492     (unless (gnus-check-backend-function
7493              'request-accept-article (car to-method))
7494       (error "%s does not support article copying" (car to-method)))
7495     (unless (gnus-check-server to-method)
7496       (error "Can't open server %s" (car to-method)))
7497     (gnus-message 6 "%s to %s: %s..."
7498                   (caddr (assq action names))
7499                   (or (car select-method) to-newsgroup) articles)
7500     (while articles
7501       (setq article (pop articles))
7502       (setq
7503        art-group
7504        (cond
7505         ;; Move the article.
7506         ((eq action 'move)
7507          ;; Remove this article from future suppression.
7508          (gnus-dup-unsuppress-article article)
7509          (gnus-request-move-article
7510           article                       ; Article to move
7511           gnus-newsgroup-name           ; From newsgroup
7512           (nth 1 (gnus-find-method-for-group
7513                   gnus-newsgroup-name)) ; Server
7514           (list 'gnus-request-accept-article
7515                 to-newsgroup (list 'quote select-method)
7516                 (not articles) t)       ; Accept form
7517           (not articles)))              ; Only save nov last time
7518         ;; Copy the article.
7519         ((eq action 'copy)
7520          (save-excursion
7521            (set-buffer copy-buf)
7522            (when (gnus-request-article-this-buffer article gnus-newsgroup-name)
7523              (gnus-request-accept-article
7524               to-newsgroup select-method (not articles) t))))
7525         ;; Crosspost the article.
7526         ((eq action 'crosspost)
7527          (let ((xref (message-tokenize-header
7528                       (mail-header-xref (gnus-summary-article-header article))
7529                       " ")))
7530            (setq new-xref (concat (gnus-group-real-name gnus-newsgroup-name)
7531                                   ":" article))
7532            (unless xref
7533              (setq xref (list (system-name))))
7534            (setq new-xref
7535                  (concat
7536                   (mapconcat 'identity
7537                              (delete "Xref:" (delete new-xref xref))
7538                              " ")
7539                   " " new-xref))
7540            (save-excursion
7541              (set-buffer copy-buf)
7542              ;; First put the article in the destination group.
7543              (gnus-request-article-this-buffer article gnus-newsgroup-name)
7544              (when (consp (setq art-group
7545                                 (gnus-request-accept-article
7546                                  to-newsgroup select-method (not articles))))
7547                (setq new-xref (concat new-xref " " (car art-group)
7548                                       ":" (cdr art-group)))
7549                ;; Now we have the new Xrefs header, so we insert
7550                ;; it and replace the new article.
7551                (nnheader-replace-header "Xref" new-xref)
7552                (gnus-request-replace-article
7553                 (cdr art-group) to-newsgroup (current-buffer))
7554                art-group))))))
7555       (cond
7556        ((not art-group)
7557         (gnus-message 1 "Couldn't %s article %s: %s"
7558                       (cadr (assq action names)) article
7559                       (nnheader-get-report (car to-method))))
7560        ((eq art-group 'junk)
7561         (when (eq action 'move)
7562           (gnus-summary-mark-article article gnus-canceled-mark)
7563           (gnus-message 4 "Deleted article %s" article)))
7564        (t
7565         (let* ((pto-group (gnus-group-prefixed-name
7566                            (car art-group) to-method))
7567                (entry
7568                 (gnus-gethash pto-group gnus-newsrc-hashtb))
7569                (info (nth 2 entry))
7570                (to-group (gnus-info-group info))
7571                to-marks)
7572           ;; Update the group that has been moved to.
7573           (when (and info
7574                      (memq action '(move copy)))
7575             (unless (member to-group to-groups)
7576               (push to-group to-groups))
7577
7578             (unless (memq article gnus-newsgroup-unreads)
7579               (push 'read to-marks)
7580               (gnus-info-set-read
7581                info (gnus-add-to-range (gnus-info-read info)
7582                                        (list (cdr art-group)))))
7583
7584             ;; See whether the article is to be put in the cache.
7585             (let ((marks gnus-article-mark-lists)
7586                   (to-article (cdr art-group)))
7587
7588               ;; Enter the article into the cache in the new group,
7589               ;; if that is required.
7590               (when gnus-use-cache
7591                 (gnus-cache-possibly-enter-article
7592                  to-group to-article
7593                  (memq article gnus-newsgroup-marked)
7594                  (memq article gnus-newsgroup-dormant)
7595                  (memq article gnus-newsgroup-unreads)))
7596
7597               (when gnus-preserve-marks
7598                 ;; Copy any marks over to the new group.
7599                 (when (and (equal to-group gnus-newsgroup-name)
7600                            (not (memq article gnus-newsgroup-unreads)))
7601                   ;; Mark this article as read in this group.
7602                   (push (cons to-article gnus-read-mark) gnus-newsgroup-reads)
7603                   (setcdr (gnus-active to-group) to-article)
7604                   (setcdr gnus-newsgroup-active to-article))
7605
7606                 (while marks
7607                   (when (memq article (symbol-value
7608                                        (intern (format "gnus-newsgroup-%s"
7609                                                        (caar marks)))))
7610                     (push (cdar marks) to-marks)
7611                     ;; If the other group is the same as this group,
7612                     ;; then we have to add the mark to the list.
7613                     (when (equal to-group gnus-newsgroup-name)
7614                       (set (intern (format "gnus-newsgroup-%s" (caar marks)))
7615                            (cons to-article
7616                                  (symbol-value
7617                                   (intern (format "gnus-newsgroup-%s"
7618                                                   (caar marks)))))))
7619                     ;; Copy the marks to other group.
7620                     (gnus-add-marked-articles
7621                      to-group (cdar marks) (list to-article) info))
7622                   (setq marks (cdr marks)))
7623
7624                 (gnus-request-set-mark to-group (list (list (list to-article)
7625                                                             'set
7626                                                             to-marks))))
7627
7628               (gnus-dribble-enter
7629                (concat "(gnus-group-set-info '"
7630                        (gnus-prin1-to-string (gnus-get-info to-group))
7631                        ")"))))
7632
7633           ;; Update the Xref header in this article to point to
7634           ;; the new crossposted article we have just created.
7635           (when (eq action 'crosspost)
7636             (save-excursion
7637               (set-buffer copy-buf)
7638               (gnus-request-article-this-buffer article gnus-newsgroup-name)
7639               (nnheader-replace-header "Xref" new-xref)
7640               (gnus-request-replace-article
7641                article gnus-newsgroup-name (current-buffer)))))
7642
7643         ;;;!!!Why is this necessary?
7644         (set-buffer gnus-summary-buffer)
7645
7646         (gnus-summary-goto-subject article)
7647         (when (eq action 'move)
7648           (gnus-summary-mark-article article gnus-canceled-mark))))
7649       (gnus-summary-remove-process-mark article))
7650     ;; Re-activate all groups that have been moved to.
7651     (while to-groups
7652       (save-excursion
7653         (set-buffer gnus-group-buffer)
7654         (when (gnus-group-goto-group (car to-groups) t)
7655           (gnus-group-get-new-news-this-group 1 t))
7656         (pop to-groups)))
7657
7658     (gnus-kill-buffer copy-buf)
7659     (gnus-summary-position-point)
7660     (gnus-set-mode-line 'summary)))
7661
7662 (defun gnus-summary-copy-article (&optional n to-newsgroup select-method)
7663   "Move the current article to a different newsgroup.
7664 If TO-NEWSGROUP is string, do not prompt for a newsgroup to move to.
7665 If SELECT-METHOD is non-nil, do not move to a specific newsgroup, but
7666 re-spool using this method."
7667   (interactive "P")
7668   (gnus-summary-move-article n to-newsgroup select-method 'copy))
7669
7670 (defun gnus-summary-crosspost-article (&optional n)
7671   "Crosspost the current article to some other group."
7672   (interactive "P")
7673   (gnus-summary-move-article n nil nil 'crosspost))
7674
7675 (defcustom gnus-summary-respool-default-method nil
7676   "Default method for respooling an article.
7677 If nil, use to the current newsgroup method."
7678   :type '(choice (gnus-select-method :value (nnml ""))
7679                  (const nil))
7680   :group 'gnus-summary-mail)
7681
7682 (defun gnus-summary-respool-article (&optional n method)
7683   "Respool the current article.
7684 The article will be squeezed through the mail spooling process again,
7685 which means that it will be put in some mail newsgroup or other
7686 depending on `nnmail-split-methods'.
7687 If N is a positive number, respool the N next articles.
7688 If N is a negative number, respool the N previous articles.
7689 If N is nil and any articles have been marked with the process mark,
7690 respool those articles instead.
7691
7692 Respooling can be done both from mail groups and \"real\" newsgroups.
7693 In the former case, the articles in question will be moved from the
7694 current group into whatever groups they are destined to.  In the
7695 latter case, they will be copied into the relevant groups."
7696   (interactive
7697    (list current-prefix-arg
7698          (let* ((methods (gnus-methods-using 'respool))
7699                 (methname
7700                  (symbol-name (or gnus-summary-respool-default-method
7701                                   (car (gnus-find-method-for-group
7702                                         gnus-newsgroup-name)))))
7703                 (method
7704                  (gnus-completing-read
7705                   methname "What backend do you want to use when respooling?"
7706                   methods nil t nil 'gnus-mail-method-history))
7707                 ms)
7708            (cond
7709             ((zerop (length (setq ms (gnus-servers-using-backend
7710                                       (intern method)))))
7711              (list (intern method) ""))
7712             ((= 1 (length ms))
7713              (car ms))
7714             (t
7715              (let ((ms-alist (mapcar (lambda (m) (cons (cadr m) m)) ms)))
7716                (cdr (assoc (completing-read "Server name: " ms-alist nil t)
7717                            ms-alist))))))))
7718   (unless method
7719     (error "No method given for respooling"))
7720   (if (assoc (symbol-name
7721               (car (gnus-find-method-for-group gnus-newsgroup-name)))
7722              (gnus-methods-using 'respool))
7723       (gnus-summary-move-article n nil method)
7724     (gnus-summary-copy-article n nil method)))
7725
7726 (defun gnus-summary-import-article (file)
7727   "Import an arbitrary file into a mail newsgroup."
7728   (interactive "fImport file: ")
7729   (let ((group gnus-newsgroup-name)
7730         (now (current-time))
7731         atts lines)
7732     (unless (gnus-check-backend-function 'request-accept-article group)
7733       (error "%s does not support article importing" group))
7734     (or (file-readable-p file)
7735         (not (file-regular-p file))
7736         (error "Can't read %s" file))
7737     (save-excursion
7738       (set-buffer (gnus-get-buffer-create " *import file*"))
7739       (erase-buffer)
7740       (nnheader-insert-file-contents file)
7741       (goto-char (point-min))
7742       (unless (nnheader-article-p)
7743         ;; This doesn't look like an article, so we fudge some headers.
7744         (setq atts (file-attributes file)
7745               lines (count-lines (point-min) (point-max)))
7746         (insert "From: " (read-string "From: ") "\n"
7747                 "Subject: " (read-string "Subject: ") "\n"
7748                 "Date: " (message-make-date (nth 5 atts))
7749                 "\n"
7750                 "Message-ID: " (message-make-message-id) "\n"
7751                 "Lines: " (int-to-string lines) "\n"
7752                 "Chars: " (int-to-string (nth 7 atts)) "\n\n"))
7753       (gnus-request-accept-article group nil t)
7754       (kill-buffer (current-buffer)))))
7755
7756 (defun gnus-summary-article-posted-p ()
7757   "Say whether the current (mail) article is available from news as well.
7758 This will be the case if the article has both been mailed and posted."
7759   (interactive)
7760   (let ((id (mail-header-references (gnus-summary-article-header)))
7761         (gnus-override-method (car (gnus-refer-article-methods))))
7762     (if (gnus-request-head id "")
7763         (gnus-message 2 "The current message was found on %s"
7764                       gnus-override-method)
7765       (gnus-message 2 "The current message couldn't be found on %s"
7766                     gnus-override-method)
7767       nil)))
7768
7769 (defun gnus-summary-expire-articles (&optional now)
7770   "Expire all articles that are marked as expirable in the current group."
7771   (interactive)
7772   (when (gnus-check-backend-function
7773          'request-expire-articles gnus-newsgroup-name)
7774     ;; This backend supports expiry.
7775     (let* ((total (gnus-group-total-expirable-p gnus-newsgroup-name))
7776            (expirable (if total
7777                           (progn
7778                             ;; We need to update the info for
7779                             ;; this group for `gnus-list-of-read-articles'
7780                             ;; to give us the right answer.
7781                             (gnus-run-hooks 'gnus-exit-group-hook)
7782                             (gnus-summary-update-info)
7783                             (gnus-list-of-read-articles gnus-newsgroup-name))
7784                         (setq gnus-newsgroup-expirable
7785                               (sort gnus-newsgroup-expirable '<))))
7786            (expiry-wait (if now 'immediate
7787                           (gnus-group-find-parameter
7788                            gnus-newsgroup-name 'expiry-wait)))
7789            (nnmail-expiry-target
7790             (or (gnus-group-find-parameter gnus-newsgroup-name 'expiry-target)
7791                 nnmail-expiry-target))
7792            es)
7793       (when expirable
7794         ;; There are expirable articles in this group, so we run them
7795         ;; through the expiry process.
7796         (gnus-message 6 "Expiring articles...")
7797         (unless (gnus-check-group gnus-newsgroup-name)
7798           (error "Can't open server for %s" gnus-newsgroup-name))
7799         ;; The list of articles that weren't expired is returned.
7800         (save-excursion
7801           (if expiry-wait
7802               (let ((nnmail-expiry-wait-function nil)
7803                     (nnmail-expiry-wait expiry-wait))
7804                 (setq es (gnus-request-expire-articles
7805                           expirable gnus-newsgroup-name)))
7806             (setq es (gnus-request-expire-articles
7807                       expirable gnus-newsgroup-name))))
7808         (unless total
7809           (setq gnus-newsgroup-expirable es))
7810         ;; We go through the old list of expirable, and mark all
7811         ;; really expired articles as nonexistent.
7812         (unless (eq es expirable)       ;If nothing was expired, we don't mark.
7813           (let ((gnus-use-cache nil))
7814             (while expirable
7815               (unless (memq (car expirable) es)
7816                 (when (gnus-data-find (car expirable))
7817                   (gnus-summary-mark-article
7818                    (car expirable) gnus-canceled-mark)))
7819               (setq expirable (cdr expirable)))))
7820         (gnus-message 6 "Expiring articles...done")))))
7821
7822 (defun gnus-summary-expire-articles-now ()
7823   "Expunge all expirable articles in the current group.
7824 This means that *all* articles that are marked as expirable will be
7825 deleted forever, right now."
7826   (interactive)
7827   (or gnus-expert-user
7828       (gnus-yes-or-no-p
7829        "Are you really, really, really sure you want to delete all these messages? ")
7830       (error "Phew!"))
7831   (gnus-summary-expire-articles t))
7832
7833 ;; Suggested by Jack Vinson <vinson@unagi.cis.upenn.edu>.
7834 (defun gnus-summary-delete-article (&optional n)
7835   "Delete the N next (mail) articles.
7836 This command actually deletes articles.  This is not a marking
7837 command.  The article will disappear forever from your life, never to
7838 return.
7839 If N is negative, delete backwards.
7840 If N is nil and articles have been marked with the process mark,
7841 delete these instead."
7842   (interactive "P")
7843   (unless (gnus-check-backend-function 'request-expire-articles
7844                                        gnus-newsgroup-name)
7845     (error "The current newsgroup does not support article deletion"))
7846   (unless (gnus-check-server (gnus-find-method-for-group gnus-newsgroup-name))
7847     (error "Couldn't open server"))
7848   ;; Compute the list of articles to delete.
7849   (let ((articles (sort (copy-sequence (gnus-summary-work-articles n)) '<))
7850         not-deleted)
7851     (if (and gnus-novice-user
7852              (not (gnus-yes-or-no-p
7853                    (format "Do you really want to delete %s forever? "
7854                            (if (> (length articles) 1)
7855                                (format "these %s articles" (length articles))
7856                              "this article")))))
7857         ()
7858       ;; Delete the articles.
7859       (setq not-deleted (gnus-request-expire-articles
7860                          articles gnus-newsgroup-name 'force))
7861       (while articles
7862         (gnus-summary-remove-process-mark (car articles))
7863         ;; The backend might not have been able to delete the article
7864         ;; after all.
7865         (unless (memq (car articles) not-deleted)
7866           (gnus-summary-mark-article (car articles) gnus-canceled-mark))
7867         (setq articles (cdr articles)))
7868       (when not-deleted
7869         (gnus-message 4 "Couldn't delete articles %s" not-deleted)))
7870     (gnus-summary-position-point)
7871     (gnus-set-mode-line 'summary)
7872     not-deleted))
7873
7874 (defun gnus-summary-edit-article (&optional arg)
7875   "Edit the current article.
7876 This will have permanent effect only in mail groups.
7877 If ARG is nil, edit the decoded articles.
7878 If ARG is 1, edit the raw articles.
7879 If ARG is 2, edit the raw articles even in read-only groups.
7880 Otherwise, allow editing of articles even in read-only
7881 groups."
7882   (interactive "P")
7883   (let (force raw)
7884     (cond
7885      ((null arg))
7886      ((eq arg 1) (setq raw t))
7887      ((eq arg 2) (setq raw t
7888                        force t))
7889      (t (setq force t)))
7890     (if (and raw (not force) (equal gnus-newsgroup-name "nndraft:drafts"))
7891         (error "Can't edit the raw article in group nndraft:drafts."))
7892     (save-excursion
7893       (set-buffer gnus-summary-buffer)
7894       (let ((mail-parse-charset gnus-newsgroup-charset)
7895             (mail-parse-ignored-charsets gnus-newsgroup-ignored-charsets))
7896         (gnus-set-global-variables)
7897         (when (and (not force)
7898                    (gnus-group-read-only-p))
7899           (error "The current newsgroup does not support article editing"))
7900         (gnus-summary-show-article t)
7901         (when (and (not raw) (gnus-buffer-live-p gnus-article-buffer))
7902           (with-current-buffer gnus-article-buffer
7903             (mm-enable-multibyte-mule4)))
7904         (if (equal gnus-newsgroup-name "nndraft:drafts")
7905             (setq raw t))
7906         (gnus-article-edit-article
7907          (if raw 'ignore
7908            #'(lambda ()
7909                (let ((mbl mml-buffer-list))
7910                  (setq mml-buffer-list nil)
7911                  (mime-to-mml)
7912                  (make-local-hook 'kill-buffer-hook)
7913                  (let ((mml-buffer-list mml-buffer-list))
7914                    (setq mml-buffer-list mbl)
7915                    (make-local-variable 'mml-buffer-list))
7916                  (add-hook 'kill-buffer-hook 'mml-destroy-buffers t t))))
7917          `(lambda (no-highlight)
7918             (let ((mail-parse-charset ',gnus-newsgroup-charset)
7919                   (mail-parse-ignored-charsets
7920                    ',gnus-newsgroup-ignored-charsets))
7921               ,(if (not raw) '(progn
7922                                 (mml-to-mime)
7923                                 (mml-destroy-buffers)
7924                                 (remove-hook 'kill-buffer-hook
7925                                              'mml-destroy-buffers t)
7926                                 (kill-local-variable 'mml-buffer-list)))
7927               (gnus-summary-edit-article-done
7928                ,(or (mail-header-references gnus-current-headers) "")
7929                ,(gnus-group-read-only-p)
7930                ,gnus-summary-buffer no-highlight))))))))
7931
7932 (defalias 'gnus-summary-edit-article-postpone 'gnus-article-edit-exit)
7933
7934 (defun gnus-summary-edit-article-done (&optional references read-only buffer
7935                                                  no-highlight)
7936   "Make edits to the current article permanent."
7937   (interactive)
7938   ;; Replace the article.
7939   (let ((buf (current-buffer)))
7940     (with-temp-buffer
7941       (insert-buffer-substring buf)
7942       (if (and (not read-only)
7943                (not (gnus-request-replace-article
7944                      (cdr gnus-article-current) (car gnus-article-current)
7945                      (current-buffer) t)))
7946           (error "Couldn't replace article")
7947         ;; Update the summary buffer.
7948         (if (and references
7949                  (equal (message-tokenize-header references " ")
7950                         (message-tokenize-header
7951                          (or (message-fetch-field "references") "") " ")))
7952             ;; We only have to update this line.
7953             (save-excursion
7954               (save-restriction
7955                 (message-narrow-to-head)
7956                 (let ((head (buffer-string))
7957                       header)
7958                   (with-temp-buffer
7959                     (insert (format "211 %d Article retrieved.\n"
7960                                     (cdr gnus-article-current)))
7961                     (insert head)
7962                     (insert ".\n")
7963                     (let ((nntp-server-buffer (current-buffer)))
7964                       (setq header (car (gnus-get-newsgroup-headers
7965                                          (save-excursion
7966                                            (set-buffer gnus-summary-buffer)
7967                                            gnus-newsgroup-dependencies)
7968                                          t))))
7969                     (save-excursion
7970                       (set-buffer gnus-summary-buffer)
7971                       (gnus-data-set-header
7972                        (gnus-data-find (cdr gnus-article-current))
7973                        header)
7974                       (gnus-summary-update-article-line
7975                        (cdr gnus-article-current) header))))))
7976           ;; Update threads.
7977           (set-buffer (or buffer gnus-summary-buffer))
7978           (gnus-summary-update-article (cdr gnus-article-current)))
7979         ;; Prettify the article buffer again.
7980         (unless no-highlight
7981           (save-excursion
7982             (set-buffer gnus-article-buffer)
7983             ;;;!!! Fix this -- article should be rehighlighted.
7984             ;;;(gnus-run-hooks 'gnus-article-display-hook)
7985             (set-buffer gnus-original-article-buffer)
7986             (gnus-request-article
7987              (cdr gnus-article-current)
7988              (car gnus-article-current) (current-buffer))))
7989         ;; Prettify the summary buffer line.
7990         (when (gnus-visual-p 'summary-highlight 'highlight)
7991           (gnus-run-hooks 'gnus-visual-mark-article-hook))))))
7992
7993 (defun gnus-summary-edit-wash (key)
7994   "Perform editing command KEY in the article buffer."
7995   (interactive
7996    (list
7997     (progn
7998       (message "%s" (concat (this-command-keys) "- "))
7999       (read-char))))
8000   (message "")
8001   (gnus-summary-edit-article)
8002   (execute-kbd-macro (concat (this-command-keys) key))
8003   (gnus-article-edit-done))
8004
8005 ;;; Respooling
8006
8007 (defun gnus-summary-respool-query (&optional silent trace)
8008   "Query where the respool algorithm would put this article."
8009   (interactive)
8010   (let (gnus-mark-article-hook)
8011     (gnus-summary-select-article)
8012     (save-excursion
8013       (set-buffer gnus-original-article-buffer)
8014       (save-restriction
8015         (message-narrow-to-head)
8016         (let ((groups (nnmail-article-group 'identity trace)))
8017           (unless silent
8018             (if groups
8019                 (message "This message would go to %s"
8020                          (mapconcat 'car groups ", "))
8021               (message "This message would go to no groups"))
8022             groups))))))
8023
8024 (defun gnus-summary-respool-trace ()
8025   "Trace where the respool algorithm would put this article.
8026 Display a buffer showing all fancy splitting patterns which matched."
8027   (interactive)
8028   (gnus-summary-respool-query nil t))
8029
8030 ;; Summary marking commands.
8031
8032 (defun gnus-summary-kill-same-subject-and-select (&optional unmark)
8033   "Mark articles which has the same subject as read, and then select the next.
8034 If UNMARK is positive, remove any kind of mark.
8035 If UNMARK is negative, tick articles."
8036   (interactive "P")
8037   (when unmark
8038     (setq unmark (prefix-numeric-value unmark)))
8039   (let ((count
8040          (gnus-summary-mark-same-subject
8041           (gnus-summary-article-subject) unmark)))
8042     ;; Select next unread article.  If auto-select-same mode, should
8043     ;; select the first unread article.
8044     (gnus-summary-next-article t (and gnus-auto-select-same
8045                                       (gnus-summary-article-subject)))
8046     (gnus-message 7 "%d article%s marked as %s"
8047                   count (if (= count 1) " is" "s are")
8048                   (if unmark "unread" "read"))))
8049
8050 (defun gnus-summary-kill-same-subject (&optional unmark)
8051   "Mark articles which has the same subject as read.
8052 If UNMARK is positive, remove any kind of mark.
8053 If UNMARK is negative, tick articles."
8054   (interactive "P")
8055   (when unmark
8056     (setq unmark (prefix-numeric-value unmark)))
8057   (let ((count
8058          (gnus-summary-mark-same-subject
8059           (gnus-summary-article-subject) unmark)))
8060     ;; If marked as read, go to next unread subject.
8061     (when (null unmark)
8062       ;; Go to next unread subject.
8063       (gnus-summary-next-subject 1 t))
8064     (gnus-message 7 "%d articles are marked as %s"
8065                   count (if unmark "unread" "read"))))
8066
8067 (defun gnus-summary-mark-same-subject (subject &optional unmark)
8068   "Mark articles with same SUBJECT as read, and return marked number.
8069 If optional argument UNMARK is positive, remove any kinds of marks.
8070 If optional argument UNMARK is negative, mark articles as unread instead."
8071   (let ((count 1))
8072     (save-excursion
8073       (cond
8074        ((null unmark)                   ; Mark as read.
8075         (while (and
8076                 (progn
8077                   (gnus-summary-mark-article-as-read gnus-killed-mark)
8078                   (gnus-summary-show-thread) t)
8079                 (gnus-summary-find-subject subject))
8080           (setq count (1+ count))))
8081        ((> unmark 0)                    ; Tick.
8082         (while (and
8083                 (progn
8084                   (gnus-summary-mark-article-as-unread gnus-ticked-mark)
8085                   (gnus-summary-show-thread) t)
8086                 (gnus-summary-find-subject subject))
8087           (setq count (1+ count))))
8088        (t                               ; Mark as unread.
8089         (while (and
8090                 (progn
8091                   (gnus-summary-mark-article-as-unread gnus-unread-mark)
8092                   (gnus-summary-show-thread) t)
8093                 (gnus-summary-find-subject subject))
8094           (setq count (1+ count)))))
8095       (gnus-set-mode-line 'summary)
8096       ;; Return the number of marked articles.
8097       count)))
8098
8099 (defun gnus-summary-mark-as-processable (n &optional unmark)
8100   "Set the process mark on the next N articles.
8101 If N is negative, mark backward instead.  If UNMARK is non-nil, remove
8102 the process mark instead.  The difference between N and the actual
8103 number of articles marked is returned."
8104   (interactive "p")
8105   (let ((backward (< n 0))
8106         (n (abs n)))
8107     (while (and
8108             (> n 0)
8109             (if unmark
8110                 (gnus-summary-remove-process-mark
8111                  (gnus-summary-article-number))
8112               (gnus-summary-set-process-mark (gnus-summary-article-number)))
8113             (zerop (gnus-summary-next-subject (if backward -1 1) nil t)))
8114       (setq n (1- n)))
8115     (when (/= 0 n)
8116       (gnus-message 7 "No more articles"))
8117     (gnus-summary-recenter)
8118     (gnus-summary-position-point)
8119     n))
8120
8121 (defun gnus-summary-unmark-as-processable (n)
8122   "Remove the process mark from the next N articles.
8123 If N is negative, unmark backward instead.  The difference between N and
8124 the actual number of articles unmarked is returned."
8125   (interactive "p")
8126   (gnus-summary-mark-as-processable n t))
8127
8128 (defun gnus-summary-unmark-all-processable ()
8129   "Remove the process mark from all articles."
8130   (interactive)
8131   (save-excursion
8132     (while gnus-newsgroup-processable
8133       (gnus-summary-remove-process-mark (car gnus-newsgroup-processable))))
8134   (gnus-summary-position-point))
8135
8136 (defun gnus-summary-mark-as-expirable (n)
8137   "Mark N articles forward as expirable.
8138 If N is negative, mark backward instead.  The difference between N and
8139 the actual number of articles marked is returned."
8140   (interactive "p")
8141   (gnus-summary-mark-forward n gnus-expirable-mark))
8142
8143 (defun gnus-summary-mark-article-as-replied (article)
8144   "Mark ARTICLE replied and update the summary line."
8145   (push article gnus-newsgroup-replied)
8146   (let ((buffer-read-only nil))
8147     (when (gnus-summary-goto-subject article nil t)
8148       (gnus-summary-update-secondary-mark article))))
8149
8150 (defun gnus-summary-set-bookmark (article)
8151   "Set a bookmark in current article."
8152   (interactive (list (gnus-summary-article-number)))
8153   (when (or (not (get-buffer gnus-article-buffer))
8154             (not gnus-current-article)
8155             (not gnus-article-current)
8156             (not (equal gnus-newsgroup-name (car gnus-article-current))))
8157     (error "No current article selected"))
8158   ;; Remove old bookmark, if one exists.
8159   (let ((old (assq article gnus-newsgroup-bookmarks)))
8160     (when old
8161       (setq gnus-newsgroup-bookmarks
8162             (delq old gnus-newsgroup-bookmarks))))
8163   ;; Set the new bookmark, which is on the form
8164   ;; (article-number . line-number-in-body).
8165   (push
8166    (cons article
8167          (save-excursion
8168            (set-buffer gnus-article-buffer)
8169            (count-lines
8170             (min (point)
8171                  (save-excursion
8172                    (goto-char (point-min))
8173                    (search-forward "\n\n" nil t)
8174                    (point)))
8175             (point))))
8176    gnus-newsgroup-bookmarks)
8177   (gnus-message 6 "A bookmark has been added to the current article."))
8178
8179 (defun gnus-summary-remove-bookmark (article)
8180   "Remove the bookmark from the current article."
8181   (interactive (list (gnus-summary-article-number)))
8182   ;; Remove old bookmark, if one exists.
8183   (let ((old (assq article gnus-newsgroup-bookmarks)))
8184     (if old
8185         (progn
8186           (setq gnus-newsgroup-bookmarks
8187                 (delq old gnus-newsgroup-bookmarks))
8188           (gnus-message 6 "Removed bookmark."))
8189       (gnus-message 6 "No bookmark in current article."))))
8190
8191 ;; Suggested by Daniel Quinlan <quinlan@best.com>.
8192 (defun gnus-summary-mark-as-dormant (n)
8193   "Mark N articles forward as dormant.
8194 If N is negative, mark backward instead.  The difference between N and
8195 the actual number of articles marked is returned."
8196   (interactive "p")
8197   (gnus-summary-mark-forward n gnus-dormant-mark))
8198
8199 (defun gnus-summary-set-process-mark (article)
8200   "Set the process mark on ARTICLE and update the summary line."
8201   (setq gnus-newsgroup-processable
8202         (cons article
8203               (delq article gnus-newsgroup-processable)))
8204   (when (gnus-summary-goto-subject article)
8205     (gnus-summary-show-thread)
8206     (gnus-summary-goto-subject article)
8207     (gnus-summary-update-secondary-mark article)))
8208
8209 (defun gnus-summary-remove-process-mark (article)
8210   "Remove the process mark from ARTICLE and update the summary line."
8211   (setq gnus-newsgroup-processable (delq article gnus-newsgroup-processable))
8212   (when (gnus-summary-goto-subject article)
8213     (gnus-summary-show-thread)
8214     (gnus-summary-goto-subject article)
8215     (gnus-summary-update-secondary-mark article)))
8216
8217 (defun gnus-summary-set-saved-mark (article)
8218   "Set the process mark on ARTICLE and update the summary line."
8219   (push article gnus-newsgroup-saved)
8220   (when (gnus-summary-goto-subject article)
8221     (gnus-summary-update-secondary-mark article)))
8222
8223 (defun gnus-summary-mark-forward (n &optional mark no-expire)
8224   "Mark N articles as read forwards.
8225 If N is negative, mark backwards instead.  Mark with MARK, ?r by default.
8226 The difference between N and the actual number of articles marked is
8227 returned.
8228 Iff NO-EXPIRE, auto-expiry will be inhibited."
8229   (interactive "p")
8230   (gnus-summary-show-thread)
8231   (let ((backward (< n 0))
8232         (gnus-summary-goto-unread
8233          (and gnus-summary-goto-unread
8234               (not (eq gnus-summary-goto-unread 'never))
8235               (not (memq mark (list gnus-unread-mark
8236                                     gnus-ticked-mark gnus-dormant-mark)))))
8237         (n (abs n))
8238         (mark (or mark gnus-del-mark)))
8239     (while (and (> n 0)
8240                 (gnus-summary-mark-article nil mark no-expire)
8241                 (zerop (gnus-summary-next-subject
8242                         (if backward -1 1)
8243                         (and gnus-summary-goto-unread
8244                              (not (eq gnus-summary-goto-unread 'never)))
8245                         t)))
8246       (setq n (1- n)))
8247     (when (/= 0 n)
8248       (gnus-message 7 "No more %sarticles" (if mark "" "unread ")))
8249     (gnus-summary-recenter)
8250     (gnus-summary-position-point)
8251     (gnus-set-mode-line 'summary)
8252     n))
8253
8254 (defun gnus-summary-mark-article-as-read (mark)
8255   "Mark the current article quickly as read with MARK."
8256   (let ((article (gnus-summary-article-number)))
8257     (setq gnus-newsgroup-unreads (delq article gnus-newsgroup-unreads))
8258     (setq gnus-newsgroup-marked (delq article gnus-newsgroup-marked))
8259     (setq gnus-newsgroup-dormant (delq article gnus-newsgroup-dormant))
8260     (push (cons article mark) gnus-newsgroup-reads)
8261     ;; Possibly remove from cache, if that is used.
8262     (when gnus-use-cache
8263       (gnus-cache-enter-remove-article article))
8264     ;; Allow the backend to change the mark.
8265     (setq mark (gnus-request-update-mark gnus-newsgroup-name article mark))
8266     ;; Check for auto-expiry.
8267     (when (and gnus-newsgroup-auto-expire
8268                (memq mark gnus-auto-expirable-marks))
8269       (setq mark gnus-expirable-mark)
8270       ;; Let the backend know about the mark change.
8271       (setq mark (gnus-request-update-mark gnus-newsgroup-name article mark))
8272       (push article gnus-newsgroup-expirable))
8273     ;; Set the mark in the buffer.
8274     (gnus-summary-update-mark mark 'unread)
8275     t))
8276
8277 (defun gnus-summary-mark-article-as-unread (mark)
8278   "Mark the current article quickly as unread with MARK."
8279   (let* ((article (gnus-summary-article-number))
8280          (old-mark (gnus-summary-article-mark article)))
8281     ;; Allow the backend to change the mark.
8282     (setq mark (gnus-request-update-mark gnus-newsgroup-name article mark))
8283     (if (eq mark old-mark)
8284         t
8285       (if (<= article 0)
8286           (progn
8287             (gnus-error 1 "Can't mark negative article numbers")
8288             nil)
8289         (setq gnus-newsgroup-marked (delq article gnus-newsgroup-marked))
8290         (setq gnus-newsgroup-dormant (delq article gnus-newsgroup-dormant))
8291         (setq gnus-newsgroup-expirable (delq article gnus-newsgroup-expirable))
8292         (setq gnus-newsgroup-reads (delq article gnus-newsgroup-reads))
8293         (cond ((= mark gnus-ticked-mark)
8294                (push article gnus-newsgroup-marked))
8295               ((= mark gnus-dormant-mark)
8296                (push article gnus-newsgroup-dormant))
8297               (t
8298                (push article gnus-newsgroup-unreads)))
8299         (gnus-pull article gnus-newsgroup-reads)
8300
8301         ;; See whether the article is to be put in the cache.
8302         (and gnus-use-cache
8303              (vectorp (gnus-summary-article-header article))
8304              (save-excursion
8305                (gnus-cache-possibly-enter-article
8306                 gnus-newsgroup-name article
8307                 (= mark gnus-ticked-mark)
8308                 (= mark gnus-dormant-mark) (= mark gnus-unread-mark))))
8309
8310         ;; Fix the mark.
8311         (gnus-summary-update-mark mark 'unread)
8312         t))))
8313
8314 (defun gnus-summary-mark-article (&optional article mark no-expire)
8315   "Mark ARTICLE with MARK.  MARK can be any character.
8316 Four MARK strings are reserved: `? ' (unread), `?!' (ticked),
8317 `??' (dormant) and `?E' (expirable).
8318 If MARK is nil, then the default character `?r' is used.
8319 If ARTICLE is nil, then the article on the current line will be
8320 marked.
8321 Iff NO-EXPIRE, auto-expiry will be inhibited."
8322   ;; The mark might be a string.
8323   (when (stringp mark)
8324     (setq mark (aref mark 0)))
8325   ;; If no mark is given, then we check auto-expiring.
8326   (when (null mark)
8327     (setq mark gnus-del-mark))
8328   (when (and (not no-expire)
8329              gnus-newsgroup-auto-expire
8330              (memq mark gnus-auto-expirable-marks))
8331     (setq mark gnus-expirable-mark))
8332   (let ((article (or article (gnus-summary-article-number)))
8333         (old-mark (gnus-summary-article-mark article)))
8334     ;; Allow the backend to change the mark.
8335     (setq mark (gnus-request-update-mark gnus-newsgroup-name article mark))
8336     (if (eq mark old-mark)
8337         t
8338       (unless article
8339         (error "No article on current line"))
8340       (if (not (if (or (= mark gnus-unread-mark)
8341                        (= mark gnus-ticked-mark)
8342                        (= mark gnus-dormant-mark))
8343                    (gnus-mark-article-as-unread article mark)
8344                  (gnus-mark-article-as-read article mark)))
8345           t
8346         ;; See whether the article is to be put in the cache.
8347         (and gnus-use-cache
8348              (not (= mark gnus-canceled-mark))
8349              (vectorp (gnus-summary-article-header article))
8350              (save-excursion
8351                (gnus-cache-possibly-enter-article
8352                 gnus-newsgroup-name article
8353                 (= mark gnus-ticked-mark)
8354                 (= mark gnus-dormant-mark) (= mark gnus-unread-mark))))
8355
8356         (when (gnus-summary-goto-subject article nil t)
8357           (let ((buffer-read-only nil))
8358             (gnus-summary-show-thread)
8359             ;; Fix the mark.
8360             (gnus-summary-update-mark mark 'unread)
8361             t))))))
8362
8363 (defun gnus-summary-update-secondary-mark (article)
8364   "Update the secondary (read, process, cache) mark."
8365   (gnus-summary-update-mark
8366    (cond ((memq article gnus-newsgroup-processable)
8367           gnus-process-mark)
8368          ((memq article gnus-newsgroup-cached)
8369           gnus-cached-mark)
8370          ((memq article gnus-newsgroup-replied)
8371           gnus-replied-mark)
8372          ((memq article gnus-newsgroup-saved)
8373           gnus-saved-mark)
8374          (t gnus-unread-mark))
8375    'replied)
8376   (when (gnus-visual-p 'summary-highlight 'highlight)
8377     (gnus-run-hooks 'gnus-summary-update-hook))
8378   t)
8379
8380 (defun gnus-summary-update-mark (mark type)
8381   (let ((forward (cdr (assq type gnus-summary-mark-positions)))
8382         (buffer-read-only nil))
8383     (re-search-backward "[\n\r]" (gnus-point-at-bol) 'move-to-limit)
8384     (when forward
8385       (when (looking-at "\r")
8386         (incf forward))
8387       (when (<= (+ forward (point)) (point-max))
8388         ;; Go to the right position on the line.
8389         (goto-char (+ forward (point)))
8390         ;; Replace the old mark with the new mark.
8391         (subst-char-in-region (point) (1+ (point)) (char-after) mark)
8392         ;; Optionally update the marks by some user rule.
8393         (when (eq type 'unread)
8394           (gnus-data-set-mark
8395            (gnus-data-find (gnus-summary-article-number)) mark)
8396           (gnus-summary-update-line (eq mark gnus-unread-mark)))))))
8397
8398 (defun gnus-mark-article-as-read (article &optional mark)
8399   "Enter ARTICLE in the pertinent lists and remove it from others."
8400   ;; Make the article expirable.
8401   (let ((mark (or mark gnus-del-mark)))
8402     (if (= mark gnus-expirable-mark)
8403         (push article gnus-newsgroup-expirable)
8404       (setq gnus-newsgroup-expirable (delq article gnus-newsgroup-expirable)))
8405     ;; Remove from unread and marked lists.
8406     (setq gnus-newsgroup-unreads (delq article gnus-newsgroup-unreads))
8407     (setq gnus-newsgroup-marked (delq article gnus-newsgroup-marked))
8408     (setq gnus-newsgroup-dormant (delq article gnus-newsgroup-dormant))
8409     (push (cons article mark) gnus-newsgroup-reads)
8410     ;; Possibly remove from cache, if that is used.
8411     (when gnus-use-cache
8412       (gnus-cache-enter-remove-article article))
8413     t))
8414
8415 (defun gnus-mark-article-as-unread (article &optional mark)
8416   "Enter ARTICLE in the pertinent lists and remove it from others."
8417   (let ((mark (or mark gnus-ticked-mark)))
8418     (if (<= article 0)
8419         (progn
8420           (gnus-error 1 "Can't mark negative article numbers")
8421           nil)
8422       (setq gnus-newsgroup-marked (delq article gnus-newsgroup-marked)
8423             gnus-newsgroup-dormant (delq article gnus-newsgroup-dormant)
8424             gnus-newsgroup-expirable (delq article gnus-newsgroup-expirable)
8425             gnus-newsgroup-unreads (delq article gnus-newsgroup-unreads))
8426
8427       ;; Unsuppress duplicates?
8428       (when gnus-suppress-duplicates
8429         (gnus-dup-unsuppress-article article))
8430
8431       (cond ((= mark gnus-ticked-mark)
8432              (push article gnus-newsgroup-marked))
8433             ((= mark gnus-dormant-mark)
8434              (push article gnus-newsgroup-dormant))
8435             (t
8436              (push article gnus-newsgroup-unreads)))
8437       (gnus-pull article gnus-newsgroup-reads)
8438       t)))
8439
8440 (defalias 'gnus-summary-mark-as-unread-forward
8441   'gnus-summary-tick-article-forward)
8442 (make-obsolete 'gnus-summary-mark-as-unread-forward
8443                'gnus-summary-tick-article-forward)
8444 (defun gnus-summary-tick-article-forward (n)
8445   "Tick N articles forwards.
8446 If N is negative, tick backwards instead.
8447 The difference between N and the number of articles ticked is returned."
8448   (interactive "p")
8449   (gnus-summary-mark-forward n gnus-ticked-mark))
8450
8451 (defalias 'gnus-summary-mark-as-unread-backward
8452   'gnus-summary-tick-article-backward)
8453 (make-obsolete 'gnus-summary-mark-as-unread-backward
8454                'gnus-summary-tick-article-backward)
8455 (defun gnus-summary-tick-article-backward (n)
8456   "Tick N articles backwards.
8457 The difference between N and the number of articles ticked is returned."
8458   (interactive "p")
8459   (gnus-summary-mark-forward (- n) gnus-ticked-mark))
8460
8461 (defalias 'gnus-summary-mark-as-unread 'gnus-summary-tick-article)
8462 (make-obsolete 'gnus-summary-mark-as-unread 'gnus-summary-tick-article)
8463 (defun gnus-summary-tick-article (&optional article clear-mark)
8464   "Mark current article as unread.
8465 Optional 1st argument ARTICLE specifies article number to be marked as unread.
8466 Optional 2nd argument CLEAR-MARK remove any kinds of mark."
8467   (interactive)
8468   (gnus-summary-mark-article article (if clear-mark gnus-unread-mark
8469                                        gnus-ticked-mark)))
8470
8471 (defun gnus-summary-mark-as-read-forward (n)
8472   "Mark N articles as read forwards.
8473 If N is negative, mark backwards instead.
8474 The difference between N and the actual number of articles marked is
8475 returned."
8476   (interactive "p")
8477   (gnus-summary-mark-forward n gnus-del-mark gnus-inhibit-user-auto-expire))
8478
8479 (defun gnus-summary-mark-as-read-backward (n)
8480   "Mark the N articles as read backwards.
8481 The difference between N and the actual number of articles marked is
8482 returned."
8483   (interactive "p")
8484   (gnus-summary-mark-forward
8485    (- n) gnus-del-mark gnus-inhibit-user-auto-expire))
8486
8487 (defun gnus-summary-mark-as-read (&optional article mark)
8488   "Mark current article as read.
8489 ARTICLE specifies the article to be marked as read.
8490 MARK specifies a string to be inserted at the beginning of the line."
8491   (gnus-summary-mark-article article mark))
8492
8493 (defun gnus-summary-clear-mark-forward (n)
8494   "Clear marks from N articles forward.
8495 If N is negative, clear backward instead.
8496 The difference between N and the number of marks cleared is returned."
8497   (interactive "p")
8498   (gnus-summary-mark-forward n gnus-unread-mark))
8499
8500 (defun gnus-summary-clear-mark-backward (n)
8501   "Clear marks from N articles backward.
8502 The difference between N and the number of marks cleared is returned."
8503   (interactive "p")
8504   (gnus-summary-mark-forward (- n) gnus-unread-mark))
8505
8506 (defun gnus-summary-mark-unread-as-read ()
8507   "Intended to be used by `gnus-summary-mark-article-hook'."
8508   (when (memq gnus-current-article gnus-newsgroup-unreads)
8509     (gnus-summary-mark-article gnus-current-article gnus-read-mark)))
8510
8511 (defun gnus-summary-mark-read-and-unread-as-read ()
8512   "Intended to be used by `gnus-summary-mark-article-hook'."
8513   (let ((mark (gnus-summary-article-mark)))
8514     (when (or (gnus-unread-mark-p mark)
8515               (gnus-read-mark-p mark))
8516       (gnus-summary-mark-article gnus-current-article gnus-read-mark))))
8517
8518 (defun gnus-summary-mark-region-as-read (point mark all)
8519   "Mark all unread articles between point and mark as read.
8520 If given a prefix, mark all articles between point and mark as read,
8521 even ticked and dormant ones."
8522   (interactive "r\nP")
8523   (save-excursion
8524     (let (article)
8525       (goto-char point)
8526       (beginning-of-line)
8527       (while (and
8528               (< (point) mark)
8529               (progn
8530                 (when (or all
8531                           (memq (setq article (gnus-summary-article-number))
8532                                 gnus-newsgroup-unreads))
8533                   (gnus-summary-mark-article article gnus-del-mark))
8534                 t)
8535               (gnus-summary-find-next))))))
8536
8537 (defun gnus-summary-mark-below (score mark)
8538   "Mark articles with score less than SCORE with MARK."
8539   (interactive "P\ncMark: ")
8540   (setq score (if score
8541                   (prefix-numeric-value score)
8542                 (or gnus-summary-default-score 0)))
8543   (save-excursion
8544     (set-buffer gnus-summary-buffer)
8545     (goto-char (point-min))
8546     (while
8547         (progn
8548           (and (< (gnus-summary-article-score) score)
8549                (gnus-summary-mark-article nil mark))
8550           (gnus-summary-find-next)))))
8551
8552 (defun gnus-summary-kill-below (&optional score)
8553   "Mark articles with score below SCORE as read."
8554   (interactive "P")
8555   (gnus-summary-mark-below score gnus-killed-mark))
8556
8557 (defun gnus-summary-clear-above (&optional score)
8558   "Clear all marks from articles with score above SCORE."
8559   (interactive "P")
8560   (gnus-summary-mark-above score gnus-unread-mark))
8561
8562 (defun gnus-summary-tick-above (&optional score)
8563   "Tick all articles with score above SCORE."
8564   (interactive "P")
8565   (gnus-summary-mark-above score gnus-ticked-mark))
8566
8567 (defun gnus-summary-mark-above (score mark)
8568   "Mark articles with score over SCORE with MARK."
8569   (interactive "P\ncMark: ")
8570   (setq score (if score
8571                   (prefix-numeric-value score)
8572                 (or gnus-summary-default-score 0)))
8573   (save-excursion
8574     (set-buffer gnus-summary-buffer)
8575     (goto-char (point-min))
8576     (while (and (progn
8577                   (when (> (gnus-summary-article-score) score)
8578                     (gnus-summary-mark-article nil mark))
8579                   t)
8580                 (gnus-summary-find-next)))))
8581
8582 ;; Suggested by Daniel Quinlan <quinlan@best.com>.
8583 (defalias 'gnus-summary-show-all-expunged 'gnus-summary-limit-include-expunged)
8584 (defun gnus-summary-limit-include-expunged (&optional no-error)
8585   "Display all the hidden articles that were expunged for low scores."
8586   (interactive)
8587   (let ((buffer-read-only nil))
8588     (let ((scored gnus-newsgroup-scored)
8589           headers h)
8590       (while scored
8591         (unless (gnus-summary-goto-subject (caar scored))
8592           (and (setq h (gnus-summary-article-header (caar scored)))
8593                (< (cdar scored) gnus-summary-expunge-below)
8594                (push h headers)))
8595         (setq scored (cdr scored)))
8596       (if (not headers)
8597           (when (not no-error)
8598             (error "No expunged articles hidden"))
8599         (goto-char (point-min))
8600         (gnus-summary-prepare-unthreaded (nreverse headers))
8601         (goto-char (point-min))
8602         (gnus-summary-position-point)
8603         t))))
8604
8605 (defun gnus-summary-catchup (&optional all quietly to-here not-mark)
8606   "Mark all unread articles in this newsgroup as read.
8607 If prefix argument ALL is non-nil, ticked and dormant articles will
8608 also be marked as read.
8609 If QUIETLY is non-nil, no questions will be asked.
8610 If TO-HERE is non-nil, it should be a point in the buffer.  All
8611 articles before this point will be marked as read.
8612 Note that this function will only catch up the unread article
8613 in the current summary buffer limitation.
8614 The number of articles marked as read is returned."
8615   (interactive "P")
8616   (prog1
8617       (save-excursion
8618         (when (or quietly
8619                   (not gnus-interactive-catchup) ;Without confirmation?
8620                   gnus-expert-user
8621                   (gnus-y-or-n-p
8622                    (if all
8623                        "Mark absolutely all articles as read? "
8624                      "Mark all unread articles as read? ")))
8625           (if (and not-mark
8626                    (not gnus-newsgroup-adaptive)
8627                    (not gnus-newsgroup-auto-expire)
8628                    (not gnus-suppress-duplicates)
8629                    (or (not gnus-use-cache)
8630                        (eq gnus-use-cache 'passive)))
8631               (progn
8632                 (when all
8633                   (setq gnus-newsgroup-marked nil
8634                         gnus-newsgroup-dormant nil))
8635                 (setq gnus-newsgroup-unreads gnus-newsgroup-downloadable))
8636             ;; We actually mark all articles as canceled, which we
8637             ;; have to do when using auto-expiry or adaptive scoring.
8638             (gnus-summary-show-all-threads)
8639             (when (gnus-summary-first-subject (not all) t)
8640               (while (and
8641                       (if to-here (< (point) to-here) t)
8642                       (gnus-summary-mark-article-as-read gnus-catchup-mark)
8643                       (gnus-summary-find-next (not all) nil nil t))))
8644             (gnus-set-mode-line 'summary))
8645           t))
8646     (gnus-summary-position-point)))
8647
8648 (defun gnus-summary-catchup-to-here (&optional all)
8649   "Mark all unticked articles before the current one as read.
8650 If ALL is non-nil, also mark ticked and dormant articles as read."
8651   (interactive "P")
8652   (save-excursion
8653     (gnus-save-hidden-threads
8654       (let ((beg (point)))
8655         ;; We check that there are unread articles.
8656         (when (or all (gnus-summary-find-prev))
8657           (gnus-summary-catchup all t beg)))))
8658   (gnus-summary-position-point))
8659
8660 (defun gnus-summary-catchup-all (&optional quietly)
8661   "Mark all articles in this newsgroup as read."
8662   (interactive "P")
8663   (gnus-summary-catchup t quietly))
8664
8665 (defun gnus-summary-catchup-and-exit (&optional all quietly)
8666   "Mark all unread articles in this group as read, then exit.
8667 If prefix argument ALL is non-nil, all articles are marked as read."
8668   (interactive "P")
8669   (when (gnus-summary-catchup all quietly nil 'fast)
8670     ;; Select next newsgroup or exit.
8671     (if (and (not (gnus-group-quit-config gnus-newsgroup-name))
8672              (eq gnus-auto-select-next 'quietly))
8673         (gnus-summary-next-group nil)
8674       (gnus-summary-exit))))
8675
8676 (defun gnus-summary-catchup-all-and-exit (&optional quietly)
8677   "Mark all articles in this newsgroup as read, and then exit."
8678   (interactive "P")
8679   (gnus-summary-catchup-and-exit t quietly))
8680
8681 (defun gnus-summary-catchup-and-goto-next-group (&optional all)
8682   "Mark all articles in this group as read and select the next group.
8683 If given a prefix, mark all articles, unread as well as ticked, as
8684 read."
8685   (interactive "P")
8686   (save-excursion
8687     (gnus-summary-catchup all))
8688   (gnus-summary-next-group))
8689
8690 ;;;
8691 ;;; with article
8692 ;;;
8693
8694 (defmacro gnus-with-article (article &rest forms)
8695   "Select ARTICLE and perform FORMS in the original article buffer.
8696 Then replace the article with the result."
8697   `(progn
8698      ;; We don't want the article to be marked as read.
8699      (let (gnus-mark-article-hook)
8700        (gnus-summary-select-article t t nil ,article))
8701      (set-buffer gnus-original-article-buffer)
8702      ,@forms
8703      (if (not (gnus-check-backend-function
8704                'request-replace-article (car gnus-article-current)))
8705          (gnus-message 5 "Read-only group; not replacing")
8706        (unless (gnus-request-replace-article
8707                 ,article (car gnus-article-current)
8708                 (current-buffer) t)
8709          (error "Couldn't replace article")))
8710      ;; The cache and backlog have to be flushed somewhat.
8711      (when gnus-keep-backlog
8712        (gnus-backlog-remove-article
8713         (car gnus-article-current) (cdr gnus-article-current)))
8714      (when gnus-use-cache
8715        (gnus-cache-update-article
8716         (car gnus-article-current) (cdr gnus-article-current)))))
8717
8718 (put 'gnus-with-article 'lisp-indent-function 1)
8719 (put 'gnus-with-article 'edebug-form-spec '(form body))
8720
8721 ;; Thread-based commands.
8722
8723 (defun gnus-summary-articles-in-thread (&optional article)
8724   "Return a list of all articles in the current thread.
8725 If ARTICLE is non-nil, return all articles in the thread that starts
8726 with that article."
8727   (let* ((article (or article (gnus-summary-article-number)))
8728          (data (gnus-data-find-list article))
8729          (top-level (gnus-data-level (car data)))
8730          (top-subject
8731           (cond ((null gnus-thread-operation-ignore-subject)
8732                  (gnus-simplify-subject-re
8733                   (mail-header-subject (gnus-data-header (car data)))))
8734                 ((eq gnus-thread-operation-ignore-subject 'fuzzy)
8735                  (gnus-simplify-subject-fuzzy
8736                   (mail-header-subject (gnus-data-header (car data)))))
8737                 (t nil)))
8738          (end-point (save-excursion
8739                       (if (gnus-summary-go-to-next-thread)
8740                           (point) (point-max))))
8741          articles)
8742     (while (and data
8743                 (< (gnus-data-pos (car data)) end-point))
8744       (when (or (not top-subject)
8745                 (string= top-subject
8746                          (if (eq gnus-thread-operation-ignore-subject 'fuzzy)
8747                              (gnus-simplify-subject-fuzzy
8748                               (mail-header-subject
8749                                (gnus-data-header (car data))))
8750                            (gnus-simplify-subject-re
8751                             (mail-header-subject
8752                              (gnus-data-header (car data)))))))
8753         (push (gnus-data-number (car data)) articles))
8754       (unless (and (setq data (cdr data))
8755                    (> (gnus-data-level (car data)) top-level))
8756         (setq data nil)))
8757     ;; Return the list of articles.
8758     (nreverse articles)))
8759
8760 (defun gnus-summary-rethread-current ()
8761   "Rethread the thread the current article is part of."
8762   (interactive)
8763   (let* ((gnus-show-threads t)
8764          (article (gnus-summary-article-number))
8765          (id (mail-header-id (gnus-summary-article-header)))
8766          (gnus-newsgroup-threads (list (gnus-id-to-thread (gnus-root-id id)))))
8767     (unless id
8768       (error "No article on the current line"))
8769     (gnus-rebuild-thread id)
8770     (gnus-summary-goto-subject article)))
8771
8772 (defun gnus-summary-reparent-thread ()
8773   "Make the current article child of the marked (or previous) article.
8774
8775 Note that the re-threading will only work if `gnus-thread-ignore-subject'
8776 is non-nil or the Subject: of both articles are the same."
8777   (interactive)
8778   (unless (not (gnus-group-read-only-p))
8779     (error "The current newsgroup does not support article editing"))
8780   (unless (<= (length gnus-newsgroup-processable) 1)
8781     (error "No more than one article may be marked"))
8782   (save-window-excursion
8783     (let ((gnus-article-buffer " *reparent*")
8784           (current-article (gnus-summary-article-number))
8785           ;; First grab the marked article, otherwise one line up.
8786           (parent-article (if (not (null gnus-newsgroup-processable))
8787                               (car gnus-newsgroup-processable)
8788                             (save-excursion
8789                               (if (eq (forward-line -1) 0)
8790                                   (gnus-summary-article-number)
8791                                 (error "Beginning of summary buffer"))))))
8792       (unless (not (eq current-article parent-article))
8793         (error "An article may not be self-referential"))
8794       (let ((message-id (mail-header-id
8795                          (gnus-summary-article-header parent-article))))
8796         (unless (and message-id (not (equal message-id "")))
8797           (error "No message-id in desired parent"))
8798         (gnus-with-article current-article
8799           (save-restriction
8800             (goto-char (point-min))
8801             (message-narrow-to-head)
8802             (if (re-search-forward "^References: " nil t)
8803                 (progn
8804                   (re-search-forward "^[^ \t]" nil t)
8805                   (forward-line -1)
8806                   (end-of-line)
8807                   (insert " " message-id))
8808               (insert "References: " message-id "\n"))))
8809         (set-buffer gnus-summary-buffer)
8810         (gnus-summary-unmark-all-processable)
8811         (gnus-summary-update-article current-article)
8812         (gnus-summary-rethread-current)
8813         (gnus-message 3 "Article %d is now the child of article %d"
8814                       current-article parent-article)))))
8815
8816 (defun gnus-summary-toggle-threads (&optional arg)
8817   "Toggle showing conversation threads.
8818 If ARG is positive number, turn showing conversation threads on."
8819   (interactive "P")
8820   (let ((current (or (gnus-summary-article-number) gnus-newsgroup-end)))
8821     (setq gnus-show-threads
8822           (if (null arg) (not gnus-show-threads)
8823             (> (prefix-numeric-value arg) 0)))
8824     (gnus-summary-prepare)
8825     (gnus-summary-goto-subject current)
8826     (gnus-message 6 "Threading is now %s" (if gnus-show-threads "on" "off"))
8827     (gnus-summary-position-point)))
8828
8829 (defun gnus-summary-show-all-threads ()
8830   "Show all threads."
8831   (interactive)
8832   (save-excursion
8833     (let ((buffer-read-only nil))
8834       (subst-char-in-region (point-min) (point-max) ?\^M ?\n t)))
8835   (gnus-summary-position-point))
8836
8837 (defun gnus-summary-show-thread ()
8838   "Show thread subtrees.
8839 Returns nil if no thread was there to be shown."
8840   (interactive)
8841   (let ((buffer-read-only nil)
8842         (orig (point))
8843         ;; first goto end then to beg, to have point at beg after let
8844         (end (progn (end-of-line) (point)))
8845         (beg (progn (beginning-of-line) (point))))
8846     (prog1
8847         ;; Any hidden lines here?
8848         (search-forward "\r" end t)
8849       (subst-char-in-region beg end ?\^M ?\n t)
8850       (goto-char orig)
8851       (gnus-summary-position-point))))
8852
8853 (defun gnus-summary-hide-all-threads ()
8854   "Hide all thread subtrees."
8855   (interactive)
8856   (save-excursion
8857     (goto-char (point-min))
8858     (gnus-summary-hide-thread)
8859     (while (zerop (gnus-summary-next-thread 1 t))
8860       (gnus-summary-hide-thread)))
8861   (gnus-summary-position-point))
8862
8863 (defun gnus-summary-hide-thread ()
8864   "Hide thread subtrees.
8865 Returns nil if no threads were there to be hidden."
8866   (interactive)
8867   (let ((buffer-read-only nil)
8868         (start (point))
8869         (article (gnus-summary-article-number)))
8870     (goto-char start)
8871     ;; Go forward until either the buffer ends or the subthread
8872     ;; ends.
8873     (when (and (not (eobp))
8874                (or (zerop (gnus-summary-next-thread 1 t))
8875                    (goto-char (point-max))))
8876       (prog1
8877           (if (and (> (point) start)
8878                    (search-backward "\n" start t))
8879               (progn
8880                 (subst-char-in-region start (point) ?\n ?\^M)
8881                 (gnus-summary-goto-subject article))
8882             (goto-char start)
8883             nil)))))
8884
8885 (defun gnus-summary-go-to-next-thread (&optional previous)
8886   "Go to the same level (or less) next thread.
8887 If PREVIOUS is non-nil, go to previous thread instead.
8888 Return the article number moved to, or nil if moving was impossible."
8889   (let ((level (gnus-summary-thread-level))
8890         (way (if previous -1 1))
8891         (beg (point)))
8892     (forward-line way)
8893     (while (and (not (eobp))
8894                 (< level (gnus-summary-thread-level)))
8895       (forward-line way))
8896     (if (eobp)
8897         (progn
8898           (goto-char beg)
8899           nil)
8900       (setq beg (point))
8901       (prog1
8902           (gnus-summary-article-number)
8903         (goto-char beg)))))
8904
8905 (defun gnus-summary-next-thread (n &optional silent)
8906   "Go to the same level next N'th thread.
8907 If N is negative, search backward instead.
8908 Returns the difference between N and the number of skips actually
8909 done.
8910
8911 If SILENT, don't output messages."
8912   (interactive "p")
8913   (let ((backward (< n 0))
8914         (n (abs n)))
8915     (while (and (> n 0)
8916                 (gnus-summary-go-to-next-thread backward))
8917       (decf n))
8918     (unless silent
8919       (gnus-summary-position-point))
8920     (when (and (not silent) (/= 0 n))
8921       (gnus-message 7 "No more threads"))
8922     n))
8923
8924 (defun gnus-summary-prev-thread (n)
8925   "Go to the same level previous N'th thread.
8926 Returns the difference between N and the number of skips actually
8927 done."
8928   (interactive "p")
8929   (gnus-summary-next-thread (- n)))
8930
8931 (defun gnus-summary-go-down-thread ()
8932   "Go down one level in the current thread."
8933   (let ((children (gnus-summary-article-children)))
8934     (when children
8935       (gnus-summary-goto-subject (car children)))))
8936
8937 (defun gnus-summary-go-up-thread ()
8938   "Go up one level in the current thread."
8939   (let ((parent (gnus-summary-article-parent)))
8940     (when parent
8941       (gnus-summary-goto-subject parent))))
8942
8943 (defun gnus-summary-down-thread (n)
8944   "Go down thread N steps.
8945 If N is negative, go up instead.
8946 Returns the difference between N and how many steps down that were
8947 taken."
8948   (interactive "p")
8949   (let ((up (< n 0))
8950         (n (abs n)))
8951     (while (and (> n 0)
8952                 (if up (gnus-summary-go-up-thread)
8953                   (gnus-summary-go-down-thread)))
8954       (setq n (1- n)))
8955     (gnus-summary-position-point)
8956     (when (/= 0 n)
8957       (gnus-message 7 "Can't go further"))
8958     n))
8959
8960 (defun gnus-summary-up-thread (n)
8961   "Go up thread N steps.
8962 If N is negative, go up instead.
8963 Returns the difference between N and how many steps down that were
8964 taken."
8965   (interactive "p")
8966   (gnus-summary-down-thread (- n)))
8967
8968 (defun gnus-summary-top-thread ()
8969   "Go to the top of the thread."
8970   (interactive)
8971   (while (gnus-summary-go-up-thread))
8972   (gnus-summary-article-number))
8973
8974 (defun gnus-summary-kill-thread (&optional unmark)
8975   "Mark articles under current thread as read.
8976 If the prefix argument is positive, remove any kinds of marks.
8977 If the prefix argument is negative, tick articles instead."
8978   (interactive "P")
8979   (when unmark
8980     (setq unmark (prefix-numeric-value unmark)))
8981   (let ((articles (gnus-summary-articles-in-thread)))
8982     (save-excursion
8983       ;; Expand the thread.
8984       (gnus-summary-show-thread)
8985       ;; Mark all the articles.
8986       (while articles
8987         (gnus-summary-goto-subject (car articles))
8988         (cond ((null unmark)
8989                (gnus-summary-mark-article-as-read gnus-killed-mark))
8990               ((> unmark 0)
8991                (gnus-summary-mark-article-as-unread gnus-unread-mark))
8992               (t
8993                (gnus-summary-mark-article-as-unread gnus-ticked-mark)))
8994         (setq articles (cdr articles))))
8995     ;; Hide killed subtrees.
8996     (and (null unmark)
8997          gnus-thread-hide-killed
8998          (gnus-summary-hide-thread))
8999     ;; If marked as read, go to next unread subject.
9000     (when (null unmark)
9001       ;; Go to next unread subject.
9002       (gnus-summary-next-subject 1 t)))
9003   (gnus-set-mode-line 'summary))
9004
9005 ;; Summary sorting commands
9006
9007 (defun gnus-summary-sort-by-number (&optional reverse)
9008   "Sort the summary buffer by article number.
9009 Argument REVERSE means reverse order."
9010   (interactive "P")
9011   (gnus-summary-sort 'number reverse))
9012
9013 (defun gnus-summary-sort-by-author (&optional reverse)
9014   "Sort the summary buffer by author name alphabetically.
9015 If `case-fold-search' is non-nil, case of letters is ignored.
9016 Argument REVERSE means reverse order."
9017   (interactive "P")
9018   (gnus-summary-sort 'author reverse))
9019
9020 (defun gnus-summary-sort-by-subject (&optional reverse)
9021   "Sort the summary buffer by subject alphabetically.  `Re:'s are ignored.
9022 If `case-fold-search' is non-nil, case of letters is ignored.
9023 Argument REVERSE means reverse order."
9024   (interactive "P")
9025   (gnus-summary-sort 'subject reverse))
9026
9027 (defun gnus-summary-sort-by-date (&optional reverse)
9028   "Sort the summary buffer by date.
9029 Argument REVERSE means reverse order."
9030   (interactive "P")
9031   (gnus-summary-sort 'date reverse))
9032
9033 (defun gnus-summary-sort-by-score (&optional reverse)
9034   "Sort the summary buffer by score.
9035 Argument REVERSE means reverse order."
9036   (interactive "P")
9037   (gnus-summary-sort 'score reverse))
9038
9039 (defun gnus-summary-sort-by-lines (&optional reverse)
9040   "Sort the summary buffer by the number of lines.
9041 Argument REVERSE means reverse order."
9042   (interactive "P")
9043   (gnus-summary-sort 'lines reverse))
9044
9045 (defun gnus-summary-sort-by-chars (&optional reverse)
9046   "Sort the summary buffer by article length.
9047 Argument REVERSE means reverse order."
9048   (interactive "P")
9049   (gnus-summary-sort 'chars reverse))
9050
9051 (defun gnus-summary-sort (predicate reverse)
9052   "Sort summary buffer by PREDICATE.  REVERSE means reverse order."
9053   (let* ((thread (intern (format "gnus-thread-sort-by-%s" predicate)))
9054          (article (intern (format "gnus-article-sort-by-%s" predicate)))
9055          (gnus-thread-sort-functions
9056           (if (not reverse)
9057               thread
9058             `(lambda (t1 t2)
9059                (,thread t2 t1))))
9060          (gnus-sort-gathered-threads-function
9061           gnus-thread-sort-functions)
9062          (gnus-article-sort-functions
9063           (if (not reverse)
9064               article
9065             `(lambda (t1 t2)
9066                (,article t2 t1))))
9067          (buffer-read-only)
9068          (gnus-summary-prepare-hook nil))
9069     ;; We do the sorting by regenerating the threads.
9070     (gnus-summary-prepare)
9071     ;; Hide subthreads if needed.
9072     (when (and gnus-show-threads gnus-thread-hide-subtree)
9073       (gnus-summary-hide-all-threads))))
9074
9075 ;; Summary saving commands.
9076
9077 (defun gnus-summary-save-article (&optional n not-saved)
9078   "Save the current article using the default saver function.
9079 If N is a positive number, save the N next articles.
9080 If N is a negative number, save the N previous articles.
9081 If N is nil and any articles have been marked with the process mark,
9082 save those articles instead.
9083 The variable `gnus-default-article-saver' specifies the saver function."
9084   (interactive "P")
9085   (let* ((articles (gnus-summary-work-articles n))
9086          (save-buffer (save-excursion
9087                         (nnheader-set-temp-buffer " *Gnus Save*")))
9088          (num (length articles))
9089          header file)
9090     (dolist (article articles)
9091       (setq header (gnus-summary-article-header article))
9092       (if (not (vectorp header))
9093           ;; This is a pseudo-article.
9094           (if (assq 'name header)
9095               (gnus-copy-file (cdr (assq 'name header)))
9096             (gnus-message 1 "Article %d is unsaveable" article))
9097         ;; This is a real article.
9098         (save-window-excursion
9099           (gnus-summary-select-article t nil nil article))
9100         (save-excursion
9101           (set-buffer save-buffer)
9102           (erase-buffer)
9103           (insert-buffer-substring gnus-original-article-buffer))
9104         (setq file (gnus-article-save save-buffer file num))
9105         (gnus-summary-remove-process-mark article)
9106         (unless not-saved
9107           (gnus-summary-set-saved-mark article))))
9108     (gnus-kill-buffer save-buffer)
9109     (gnus-summary-position-point)
9110     (gnus-set-mode-line 'summary)
9111     n))
9112
9113 (defun gnus-summary-pipe-output (&optional arg)
9114   "Pipe the current article to a subprocess.
9115 If N is a positive number, pipe the N next articles.
9116 If N is a negative number, pipe the N previous articles.
9117 If N is nil and any articles have been marked with the process mark,
9118 pipe those articles instead."
9119   (interactive "P")
9120   (let ((gnus-default-article-saver 'gnus-summary-save-in-pipe))
9121     (gnus-summary-save-article arg t))
9122   (gnus-configure-windows 'pipe))
9123
9124 (defun gnus-summary-save-article-mail (&optional arg)
9125   "Append the current article to an mail file.
9126 If N is a positive number, save the N next articles.
9127 If N is a negative number, save the N previous articles.
9128 If N is nil and any articles have been marked with the process mark,
9129 save those articles instead."
9130   (interactive "P")
9131   (let ((gnus-default-article-saver 'gnus-summary-save-in-mail))
9132     (gnus-summary-save-article arg)))
9133
9134 (defun gnus-summary-save-article-rmail (&optional arg)
9135   "Append the current article to an rmail file.
9136 If N is a positive number, save the N next articles.
9137 If N is a negative number, save the N previous articles.
9138 If N is nil and any articles have been marked with the process mark,
9139 save those articles instead."
9140   (interactive "P")
9141   (let ((gnus-default-article-saver 'gnus-summary-save-in-rmail))
9142     (gnus-summary-save-article arg)))
9143
9144 (defun gnus-summary-save-article-file (&optional arg)
9145   "Append the current article to a file.
9146 If N is a positive number, save the N next articles.
9147 If N is a negative number, save the N previous articles.
9148 If N is nil and any articles have been marked with the process mark,
9149 save those articles instead."
9150   (interactive "P")
9151   (let ((gnus-default-article-saver 'gnus-summary-save-in-file))
9152     (gnus-summary-save-article arg)))
9153
9154 (defun gnus-summary-write-article-file (&optional arg)
9155   "Write the current article to a file, deleting the previous file.
9156 If N is a positive number, save the N next articles.
9157 If N is a negative number, save the N previous articles.
9158 If N is nil and any articles have been marked with the process mark,
9159 save those articles instead."
9160   (interactive "P")
9161   (let ((gnus-default-article-saver 'gnus-summary-write-to-file))
9162     (gnus-summary-save-article arg)))
9163
9164 (defun gnus-summary-save-article-body-file (&optional arg)
9165   "Append the current article body to a file.
9166 If N is a positive number, save the N next articles.
9167 If N is a negative number, save the N previous articles.
9168 If N is nil and any articles have been marked with the process mark,
9169 save those articles instead."
9170   (interactive "P")
9171   (let ((gnus-default-article-saver 'gnus-summary-save-body-in-file))
9172     (gnus-summary-save-article arg)))
9173
9174 (defun gnus-summary-pipe-message (program)
9175   "Pipe the current article through PROGRAM."
9176   (interactive "sProgram: ")
9177   (gnus-summary-select-article)
9178   (let ((mail-header-separator ""))
9179     (gnus-eval-in-buffer-window gnus-article-buffer
9180       (save-restriction
9181         (widen)
9182         (let ((start (window-start))
9183               buffer-read-only)
9184           (message-pipe-buffer-body program)
9185           (set-window-start (get-buffer-window (current-buffer)) start))))))
9186
9187 (defun gnus-get-split-value (methods)
9188   "Return a value based on the split METHODS."
9189   (let (split-name method result match)
9190     (when methods
9191       (save-excursion
9192         (set-buffer gnus-original-article-buffer)
9193         (save-restriction
9194           (nnheader-narrow-to-headers)
9195           (while (and methods (not split-name))
9196             (goto-char (point-min))
9197             (setq method (pop methods))
9198             (setq match (car method))
9199             (when (cond
9200                    ((stringp match)
9201                     ;; Regular expression.
9202                     (ignore-errors
9203                       (re-search-forward match nil t)))
9204                    ((gnus-functionp match)
9205                     ;; Function.
9206                     (save-restriction
9207                       (widen)
9208                       (setq result (funcall match gnus-newsgroup-name))))
9209                    ((consp match)
9210                     ;; Form.
9211                     (save-restriction
9212                       (widen)
9213                       (setq result (eval match)))))
9214               (setq split-name (cdr method))
9215               (cond ((stringp result)
9216                      (push (expand-file-name
9217                             result gnus-article-save-directory)
9218                            split-name))
9219                     ((consp result)
9220                      (setq split-name (append result split-name)))))))))
9221     (nreverse split-name)))
9222
9223 (defun gnus-valid-move-group-p (group)
9224   (and (boundp group)
9225        (symbol-name group)
9226        (symbol-value group)
9227        (gnus-get-function (gnus-find-method-for-group
9228                            (symbol-name group)) 'request-accept-article t)))
9229
9230 (defun gnus-read-move-group-name (prompt default articles prefix)
9231   "Read a group name."
9232   (let* ((split-name (gnus-get-split-value gnus-move-split-methods))
9233          (minibuffer-confirm-incomplete nil) ; XEmacs
9234          (prom
9235           (format "%s %s to:"
9236                   prompt
9237                   (if (> (length articles) 1)
9238                       (format "these %d articles" (length articles))
9239                     "this article")))
9240          (to-newsgroup
9241           (cond
9242            ((null split-name)
9243             (gnus-completing-read default prom
9244                                   gnus-active-hashtb
9245                                   'gnus-valid-move-group-p
9246                                   nil prefix
9247                                   'gnus-group-history))
9248            ((= 1 (length split-name))
9249             (gnus-completing-read (car split-name) prom
9250                                   gnus-active-hashtb
9251                                   'gnus-valid-move-group-p
9252                                   nil nil
9253                                   'gnus-group-history))
9254            (t
9255             (gnus-completing-read nil prom
9256                                   (mapcar (lambda (el) (list el))
9257                                           (nreverse split-name))
9258                                   nil nil nil
9259                                   'gnus-group-history))))
9260          (to-method (gnus-server-to-method (gnus-group-method to-newsgroup))))
9261     (when to-newsgroup
9262       (if (or (string= to-newsgroup "")
9263               (string= to-newsgroup prefix))
9264           (setq to-newsgroup default))
9265       (unless to-newsgroup
9266         (error "No group name entered"))
9267       (or (gnus-active to-newsgroup)
9268           (gnus-activate-group to-newsgroup nil nil to-method)
9269           (if (gnus-y-or-n-p (format "No such group: %s.  Create it? "
9270                                      to-newsgroup))
9271               (or (and (gnus-request-create-group to-newsgroup to-method)
9272                        (gnus-activate-group
9273                         to-newsgroup nil nil to-method)
9274                        (gnus-subscribe-group to-newsgroup))
9275                   (error "Couldn't create group %s" to-newsgroup)))
9276           (error "No such group: %s" to-newsgroup)))
9277     to-newsgroup))
9278
9279 (defun gnus-summary-save-parts (type dir n &optional reverse)
9280   "Save parts matching TYPE to DIR.
9281 If REVERSE, save parts that do not match TYPE."
9282   (interactive
9283    (list (read-string "Save parts of type: "
9284                       (or (car gnus-summary-save-parts-type-history)
9285                           gnus-summary-save-parts-default-mime)
9286                       'gnus-summary-save-parts-type-history)
9287          (setq gnus-summary-save-parts-last-directory
9288                (read-file-name "Save to directory: "
9289                                gnus-summary-save-parts-last-directory
9290                                nil t))
9291          current-prefix-arg))
9292   (gnus-summary-iterate n
9293     (let ((gnus-display-mime-function nil)
9294           (gnus-inhibit-treatment t))
9295       (gnus-summary-select-article))
9296     (save-excursion
9297       (set-buffer gnus-article-buffer)
9298       (let ((handles (or gnus-article-mime-handles
9299                          (mm-dissect-buffer) (mm-uu-dissect))))
9300         (when handles
9301           (gnus-summary-save-parts-1 type dir handles reverse)
9302           (unless gnus-article-mime-handles ;; Don't destroy this case.
9303             (mm-destroy-parts handles)))))))
9304
9305 (defun gnus-summary-save-parts-1 (type dir handle reverse)
9306   (if (stringp (car handle))
9307       (mapcar (lambda (h) (gnus-summary-save-parts-1 type dir h reverse))
9308               (cdr handle))
9309     (when (if reverse
9310               (not (string-match type (mm-handle-media-type handle)))
9311             (string-match type (mm-handle-media-type handle)))
9312       (let ((file (expand-file-name
9313                    (file-name-nondirectory
9314                     (or
9315                      (mail-content-type-get
9316                       (mm-handle-disposition handle) 'filename)
9317                      (concat gnus-newsgroup-name
9318                              "." (number-to-string
9319                                   (cdr gnus-article-current)))))
9320                    dir)))
9321         (unless (file-exists-p file)
9322           (mm-save-part-to-file handle file))))))
9323
9324 ;; Summary extract commands
9325
9326 (defun gnus-summary-insert-pseudos (pslist &optional not-view)
9327   (let ((buffer-read-only nil)
9328         (article (gnus-summary-article-number))
9329         after-article b e)
9330     (unless (gnus-summary-goto-subject article)
9331       (error "No such article: %d" article))
9332     (gnus-summary-position-point)
9333     ;; If all commands are to be bunched up on one line, we collect
9334     ;; them here.
9335     (unless gnus-view-pseudos-separately
9336       (let ((ps (setq pslist (sort pslist 'gnus-pseudos<)))
9337             files action)
9338         (while ps
9339           (setq action (cdr (assq 'action (car ps))))
9340           (setq files (list (cdr (assq 'name (car ps)))))
9341           (while (and ps (cdr ps)
9342                       (string= (or action "1")
9343                                (or (cdr (assq 'action (cadr ps))) "2")))
9344             (push (cdr (assq 'name (cadr ps))) files)
9345             (setcdr ps (cddr ps)))
9346           (when files
9347             (when (not (string-match "%s" action))
9348               (push " " files))
9349             (push " " files)
9350             (when (assq 'execute (car ps))
9351               (setcdr (assq 'execute (car ps))
9352                       (funcall (if (string-match "%s" action)
9353                                    'format 'concat)
9354                                action
9355                                (mapconcat
9356                                 (lambda (f)
9357                                   (if (equal f " ")
9358                                       f
9359                                     (mm-quote-arg f)))
9360                                 files " ")))))
9361           (setq ps (cdr ps)))))
9362     (if (and gnus-view-pseudos (not not-view))
9363         (while pslist
9364           (when (assq 'execute (car pslist))
9365             (gnus-execute-command (cdr (assq 'execute (car pslist)))
9366                                   (eq gnus-view-pseudos 'not-confirm)))
9367           (setq pslist (cdr pslist)))
9368       (save-excursion
9369         (while pslist
9370           (setq after-article (or (cdr (assq 'article (car pslist)))
9371                                   (gnus-summary-article-number)))
9372           (gnus-summary-goto-subject after-article)
9373           (forward-line 1)
9374           (setq b (point))
9375           (insert "    " (file-name-nondirectory
9376                           (cdr (assq 'name (car pslist))))
9377                   ": " (or (cdr (assq 'execute (car pslist))) "") "\n")
9378           (setq e (point))
9379           (forward-line -1)             ; back to `b'
9380           (gnus-add-text-properties
9381            b (1- e) (list 'gnus-number gnus-reffed-article-number
9382                           gnus-mouse-face-prop gnus-mouse-face))
9383           (gnus-data-enter
9384            after-article gnus-reffed-article-number
9385            gnus-unread-mark b (car pslist) 0 (- e b))
9386           (push gnus-reffed-article-number gnus-newsgroup-unreads)
9387           (setq gnus-reffed-article-number (1- gnus-reffed-article-number))
9388           (setq pslist (cdr pslist)))))))
9389
9390 (defun gnus-pseudos< (p1 p2)
9391   (let ((c1 (cdr (assq 'action p1)))
9392         (c2 (cdr (assq 'action p2))))
9393     (and c1 c2 (string< c1 c2))))
9394
9395 (defun gnus-request-pseudo-article (props)
9396   (cond ((assq 'execute props)
9397          (gnus-execute-command (cdr (assq 'execute props)))))
9398   (let ((gnus-current-article (gnus-summary-article-number)))
9399     (gnus-run-hooks 'gnus-mark-article-hook)))
9400
9401 (defun gnus-execute-command (command &optional automatic)
9402   (save-excursion
9403     (gnus-article-setup-buffer)
9404     (set-buffer gnus-article-buffer)
9405     (setq buffer-read-only nil)
9406     (let ((command (if automatic command
9407                      (read-string "Command: " (cons command 0)))))
9408       (erase-buffer)
9409       (insert "$ " command "\n\n")
9410       (if gnus-view-pseudo-asynchronously
9411           (start-process "gnus-execute" (current-buffer) shell-file-name
9412                          shell-command-switch command)
9413         (call-process shell-file-name nil t nil
9414                       shell-command-switch command)))))
9415
9416 ;; Summary kill commands.
9417
9418 (defun gnus-summary-edit-global-kill (article)
9419   "Edit the \"global\" kill file."
9420   (interactive (list (gnus-summary-article-number)))
9421   (gnus-group-edit-global-kill article))
9422
9423 (defun gnus-summary-edit-local-kill ()
9424   "Edit a local kill file applied to the current newsgroup."
9425   (interactive)
9426   (setq gnus-current-headers (gnus-summary-article-header))
9427   (gnus-group-edit-local-kill
9428    (gnus-summary-article-number) gnus-newsgroup-name))
9429
9430 ;;; Header reading.
9431
9432 (defun gnus-read-header (id &optional header)
9433   "Read the headers of article ID and enter them into the Gnus system."
9434   (let ((group gnus-newsgroup-name)
9435         (gnus-override-method
9436          (or
9437           gnus-override-method
9438           (and (gnus-news-group-p gnus-newsgroup-name)
9439                (car (gnus-refer-article-methods)))))
9440         where)
9441     ;; First we check to see whether the header in question is already
9442     ;; fetched.
9443     (if (stringp id)
9444         ;; This is a Message-ID.
9445         (setq header (or header (gnus-id-to-header id)))
9446       ;; This is an article number.
9447       (setq header (or header (gnus-summary-article-header id))))
9448     (if (and header
9449              (not (gnus-summary-article-sparse-p (mail-header-number header))))
9450         ;; We have found the header.
9451         header
9452       ;; If this is a sparse article, we have to nix out its
9453       ;; previous entry in the thread hashtb.
9454       (when (and header
9455                  (gnus-summary-article-sparse-p (mail-header-number header)))
9456         (let* ((parent (gnus-parent-id (mail-header-references header)))
9457                (thread (and parent (gnus-id-to-thread parent))))
9458           (when thread
9459             (delq (assq header thread) thread))))
9460       ;; We have to really fetch the header to this article.
9461       (save-excursion
9462         (set-buffer nntp-server-buffer)
9463         (when (setq where (gnus-request-head id group))
9464           (nnheader-fold-continuation-lines)
9465           (goto-char (point-max))
9466           (insert ".\n")
9467           (goto-char (point-min))
9468           (insert "211 ")
9469           (princ (cond
9470                   ((numberp id) id)
9471                   ((cdr where) (cdr where))
9472                   (header (mail-header-number header))
9473                   (t gnus-reffed-article-number))
9474                  (current-buffer))
9475           (insert " Article retrieved.\n"))
9476         (if (or (not where)
9477                 (not (setq header (car (gnus-get-newsgroup-headers nil t)))))
9478             ()                          ; Malformed head.
9479           (unless (gnus-summary-article-sparse-p (mail-header-number header))
9480             (when (and (stringp id)
9481                        (not (string= (gnus-group-real-name group)
9482                                      (car where))))
9483               ;; If we fetched by Message-ID and the article came
9484               ;; from a different group, we fudge some bogus article
9485               ;; numbers for this article.
9486               (mail-header-set-number header gnus-reffed-article-number))
9487             (save-excursion
9488               (set-buffer gnus-summary-buffer)
9489               (decf gnus-reffed-article-number)
9490               (gnus-remove-header (mail-header-number header))
9491               (push header gnus-newsgroup-headers)
9492               (setq gnus-current-headers header)
9493               (push (mail-header-number header) gnus-newsgroup-limit)))
9494           header)))))
9495
9496 (defun gnus-remove-header (number)
9497   "Remove header NUMBER from `gnus-newsgroup-headers'."
9498   (if (and gnus-newsgroup-headers
9499            (= number (mail-header-number (car gnus-newsgroup-headers))))
9500       (pop gnus-newsgroup-headers)
9501     (let ((headers gnus-newsgroup-headers))
9502       (while (and (cdr headers)
9503                   (not (= number (mail-header-number (cadr headers)))))
9504         (pop headers))
9505       (when (cdr headers)
9506         (setcdr headers (cddr headers))))))
9507
9508 ;;;
9509 ;;; summary highlights
9510 ;;;
9511
9512 (defun gnus-highlight-selected-summary ()
9513   "Highlight selected article in summary buffer."
9514   ;; Added by Per Abrahamsen <amanda@iesd.auc.dk>.
9515   (when gnus-summary-selected-face
9516     (save-excursion
9517       (let* ((beg (progn (beginning-of-line) (point)))
9518              (end (progn (end-of-line) (point)))
9519              ;; Fix by Mike Dugan <dugan@bucrf16.bu.edu>.
9520              (from (if (get-text-property beg gnus-mouse-face-prop)
9521                        beg
9522                      (or (next-single-property-change
9523                           beg gnus-mouse-face-prop nil end)
9524                          beg)))
9525              (to
9526               (if (= from end)
9527                   (- from 2)
9528                 (or (next-single-property-change
9529                      from gnus-mouse-face-prop nil end)
9530                     end))))
9531         ;; If no mouse-face prop on line we will have to = from = end,
9532         ;; so we highlight the entire line instead.
9533         (when (= (+ to 2) from)
9534           (setq from beg)
9535           (setq to end))
9536         (if gnus-newsgroup-selected-overlay
9537             ;; Move old overlay.
9538             (gnus-move-overlay
9539              gnus-newsgroup-selected-overlay from to (current-buffer))
9540           ;; Create new overlay.
9541           (gnus-overlay-put
9542            (setq gnus-newsgroup-selected-overlay (gnus-make-overlay from to))
9543            'face gnus-summary-selected-face))))))
9544
9545 ;; New implementation by Christian Limpach <Christian.Limpach@nice.ch>.
9546 (defun gnus-summary-highlight-line ()
9547   "Highlight current line according to `gnus-summary-highlight'."
9548   (let* ((list gnus-summary-highlight)
9549          (p (point))
9550          (end (progn (end-of-line) (point)))
9551          ;; now find out where the line starts and leave point there.
9552          (beg (progn (beginning-of-line) (point)))
9553          (article (gnus-summary-article-number))
9554          (score (or (cdr (assq (or article gnus-current-article)
9555                                gnus-newsgroup-scored))
9556                     gnus-summary-default-score 0))
9557          (mark (or (gnus-summary-article-mark) gnus-unread-mark))
9558          (inhibit-read-only t))
9559     ;; Eval the cars of the lists until we find a match.
9560     (let ((default gnus-summary-default-score))
9561       (while (and list
9562                   (not (eval (caar list))))
9563         (setq list (cdr list))))
9564     (let ((face (cdar list)))
9565       (unless (eq face (get-text-property beg 'face))
9566         (gnus-put-text-property-excluding-characters-with-faces
9567          beg end 'face
9568          (setq face (if (boundp face) (symbol-value face) face)))
9569         (when gnus-summary-highlight-line-function
9570           (funcall gnus-summary-highlight-line-function article face))))
9571     (goto-char p)))
9572
9573 (defun gnus-update-read-articles (group unread &optional compute)
9574   "Update the list of read articles in GROUP."
9575   (let* ((active (or gnus-newsgroup-active (gnus-active group)))
9576          (entry (gnus-gethash group gnus-newsrc-hashtb))
9577          (info (nth 2 entry))
9578          (prev 1)
9579          (unread (sort (copy-sequence unread) '<))
9580          read)
9581     (if (or (not info) (not active))
9582         ;; There is no info on this group if it was, in fact,
9583         ;; killed.  Gnus stores no information on killed groups, so
9584         ;; there's nothing to be done.
9585         ;; One could store the information somewhere temporarily,
9586         ;; perhaps...  Hmmm...
9587         ()
9588       ;; Remove any negative articles numbers.
9589       (while (and unread (< (car unread) 0))
9590         (setq unread (cdr unread)))
9591       ;; Remove any expired article numbers
9592       (while (and unread (< (car unread) (car active)))
9593         (setq unread (cdr unread)))
9594       ;; Compute the ranges of read articles by looking at the list of
9595       ;; unread articles.
9596       (while unread
9597         (when (/= (car unread) prev)
9598           (push (if (= prev (1- (car unread))) prev
9599                   (cons prev (1- (car unread))))
9600                 read))
9601         (setq prev (1+ (car unread)))
9602         (setq unread (cdr unread)))
9603       (when (<= prev (cdr active))
9604         (push (cons prev (cdr active)) read))
9605       (setq read (if (> (length read) 1) (nreverse read) read))
9606       (if compute
9607           read
9608         (save-excursion
9609           (let (setmarkundo)
9610             ;; Propagate the read marks to the backend.
9611             (when (gnus-check-backend-function 'request-set-mark group)
9612               (let ((del (gnus-remove-from-range (gnus-info-read info) read))
9613                     (add (gnus-remove-from-range read (gnus-info-read info))))
9614                 (when (or add del)
9615                   (unless (gnus-check-group group)
9616                     (error "Can't open server for %s" group))
9617                   (gnus-request-set-mark
9618                    group (delq nil (list (if add (list add 'add '(read)))
9619                                          (if del (list del 'del '(read))))))
9620                   (setq setmarkundo
9621                         `(gnus-request-set-mark
9622                           ,group
9623                           ',(delq nil (list
9624                                        (if del (list del 'add '(read)))
9625                                        (if add (list add 'del '(read))))))))))
9626             (set-buffer gnus-group-buffer)
9627             (gnus-undo-register
9628               `(progn
9629                  (gnus-info-set-marks ',info ',(gnus-info-marks info) t)
9630                  (gnus-info-set-read ',info ',(gnus-info-read info))
9631                  (gnus-get-unread-articles-in-group ',info
9632                                                     (gnus-active ,group))
9633                  (gnus-group-update-group ,group t)
9634                  ,setmarkundo))))
9635         ;; Enter this list into the group info.
9636         (gnus-info-set-read info read)
9637         ;; Set the number of unread articles in gnus-newsrc-hashtb.
9638         (gnus-get-unread-articles-in-group info (gnus-active group))
9639         t))))
9640
9641 (defun gnus-offer-save-summaries ()
9642   "Offer to save all active summary buffers."
9643   (save-excursion
9644     (let ((buflist (buffer-list))
9645           buffers bufname)
9646       ;; Go through all buffers and find all summaries.
9647       (while buflist
9648         (and (setq bufname (buffer-name (car buflist)))
9649              (string-match "Summary" bufname)
9650              (save-excursion
9651                (set-buffer bufname)
9652                ;; We check that this is, indeed, a summary buffer.
9653                (and (eq major-mode 'gnus-summary-mode)
9654                     ;; Also make sure this isn't bogus.
9655                     gnus-newsgroup-prepared
9656                     ;; Also make sure that this isn't a dead summary buffer.
9657                     (not gnus-dead-summary-mode)))
9658              (push bufname buffers))
9659         (setq buflist (cdr buflist)))
9660       ;; Go through all these summary buffers and offer to save them.
9661       (when buffers
9662         (map-y-or-n-p
9663          "Update summary buffer %s? "
9664          (lambda (buf)
9665            (switch-to-buffer buf)
9666            (gnus-summary-exit))
9667          buffers)))))
9668
9669 (defun gnus-summary-setup-default-charset ()
9670   "Setup newsgroup default charset."
9671   (if (equal gnus-newsgroup-name "nndraft:drafts")
9672       (setq gnus-newsgroup-charset nil)
9673     (let* ((name (and gnus-newsgroup-name
9674                       (gnus-group-real-name gnus-newsgroup-name)))
9675            (ignored-charsets
9676             (or gnus-newsgroup-ephemeral-ignored-charsets
9677                 (append
9678                  (and gnus-newsgroup-name
9679                       (or (gnus-group-find-parameter gnus-newsgroup-name
9680                                                      'ignored-charsets t)
9681                           (let ((alist gnus-group-ignored-charsets-alist)
9682                                 elem (charsets nil))
9683                             (while (setq elem (pop alist))
9684                               (when (and name
9685                                          (string-match (car elem) name))
9686                                 (setq alist nil
9687                                       charsets (cdr elem))))
9688                             charsets)))
9689                  gnus-newsgroup-ignored-charsets))))
9690       (setq gnus-newsgroup-charset
9691             (or gnus-newsgroup-ephemeral-charset
9692                 (and gnus-newsgroup-name
9693                      (or (gnus-group-find-parameter gnus-newsgroup-name 'charset)
9694                          (let ((alist gnus-group-charset-alist)
9695                                elem charset)
9696                            (while (setq elem (pop alist))
9697                              (when (and name
9698                                         (string-match (car elem) name))
9699                                (setq alist nil
9700                                      charset (cadr elem))))
9701                            charset)))
9702                 gnus-default-charset))
9703       (set (make-local-variable 'gnus-newsgroup-ignored-charsets)
9704            ignored-charsets))))
9705
9706 ;;;
9707 ;;; Mime Commands
9708 ;;;
9709
9710 (defun gnus-summary-display-buttonized (&optional show-all-parts)
9711   "Display the current article buffer fully MIME-buttonized.
9712 If SHOW-ALL-PARTS (the prefix) is non-nil, all multipart/* parts are
9713 treated as multipart/mixed."
9714   (interactive "P")
9715   (require 'gnus-art)
9716   (let ((gnus-unbuttonized-mime-types nil)
9717         (gnus-mime-display-multipart-as-mixed show-all-parts))
9718     (gnus-summary-show-article)))
9719
9720 (defun gnus-summary-repair-multipart (article)
9721   "Add a Content-Type header to a multipart article without one."
9722   (interactive (list (gnus-summary-article-number)))
9723   (gnus-with-article article
9724     (message-narrow-to-head)
9725     (goto-char (point-max))
9726     (widen)
9727     (when (search-forward "\n--" nil t)
9728       (let ((separator (buffer-substring (point) (gnus-point-at-eol))))
9729         (message-narrow-to-head)
9730         (message-remove-header "Mime-Version")
9731         (message-remove-header "Content-Type")
9732         (goto-char (point-max))
9733         (insert (format "Content-Type: multipart/mixed; boundary=\"%s\"\n"
9734                         separator))
9735         (insert "Mime-Version: 1.0\n")
9736         (widen))))
9737   (let (gnus-mark-article-hook)
9738     (gnus-summary-select-article t t nil article)))
9739
9740 (defun gnus-summary-toggle-display-buttonized ()
9741   "Toggle the buttonizing of the article buffer."
9742   (interactive)
9743   (require 'gnus-art)
9744   (if (setq gnus-inhibit-mime-unbuttonizing
9745             (not gnus-inhibit-mime-unbuttonizing))
9746       (let ((gnus-unbuttonized-mime-types nil))
9747         (gnus-summary-show-article))
9748     (gnus-summary-show-article)))
9749
9750 ;;;
9751 ;;; Generic summary marking commands
9752 ;;;
9753
9754 (defvar gnus-summary-marking-alist
9755   '((read gnus-del-mark "d")
9756     (unread gnus-unread-mark "u")
9757     (ticked gnus-ticked-mark "!")
9758     (dormant gnus-dormant-mark "?")
9759     (expirable gnus-expirable-mark "e"))
9760   "An alist of names/marks/keystrokes.")
9761
9762 (defvar gnus-summary-generic-mark-map (make-sparse-keymap))
9763 (defvar gnus-summary-mark-map)
9764
9765 (defun gnus-summary-make-all-marking-commands ()
9766   (define-key gnus-summary-mark-map "M" gnus-summary-generic-mark-map)
9767   (dolist (elem gnus-summary-marking-alist)
9768     (apply 'gnus-summary-make-marking-command elem)))
9769
9770 (defun gnus-summary-make-marking-command (name mark keystroke)
9771   (let ((map (make-sparse-keymap)))
9772     (define-key gnus-summary-generic-mark-map keystroke map)
9773     (dolist (lway `((next "next" next nil "n")
9774                     (next-unread "next unread" next t "N")
9775                     (prev "previous" prev nil "p")
9776                     (prev-unread "previous unread" prev t "P")
9777                     (nomove "" nil nil ,keystroke)))
9778       (let ((func (gnus-summary-make-marking-command-1
9779                    mark (car lway) lway name)))
9780         (setq func (eval func))
9781         (define-key map (nth 4 lway) func)))))
9782
9783 (defun gnus-summary-make-marking-command-1 (mark way lway name)
9784   `(defun ,(intern
9785             (format "gnus-summary-put-mark-as-%s%s"
9786                     name (if (eq way 'nomove)
9787                              ""
9788                            (concat "-" (symbol-name way)))))
9789      (n)
9790      ,(format
9791        "Mark the current article as %s%s.
9792 If N, the prefix, then repeat N times.
9793 If N is negative, move in reverse order.
9794 The difference between N and the actual number of articles marked is
9795 returned."
9796        name (cadr lway))
9797      (interactive "p")
9798      (gnus-summary-generic-mark n ,mark ',(nth 2 lway) ,(nth 3 lway))))
9799
9800 (defun gnus-summary-generic-mark (n mark move unread)
9801   "Mark N articles with MARK."
9802   (unless (eq major-mode 'gnus-summary-mode)
9803     (error "This command can only be used in the summary buffer"))
9804   (gnus-summary-show-thread)
9805   (let ((nummove
9806          (cond
9807           ((eq move 'next) 1)
9808           ((eq move 'prev) -1)
9809           (t 0))))
9810     (if (zerop nummove)
9811         (setq n 1)
9812       (when (< n 0)
9813         (setq n (abs n)
9814               nummove (* -1 nummove))))
9815     (while (and (> n 0)
9816                 (gnus-summary-mark-article nil mark)
9817                 (zerop (gnus-summary-next-subject nummove unread t)))
9818       (setq n (1- n)))
9819     (when (/= 0 n)
9820       (gnus-message 7 "No more %sarticles" (if mark "" "unread ")))
9821     (gnus-summary-recenter)
9822     (gnus-summary-position-point)
9823     (gnus-set-mode-line 'summary)
9824     n))
9825
9826 (gnus-summary-make-all-marking-commands)
9827
9828 (gnus-ems-redefine)
9829
9830 (provide 'gnus-sum)
9831
9832 (run-hooks 'gnus-sum-load-hook)
9833
9834 ;;; gnus-sum.el ends here