lisp/gnus/gnus-topic.el

   1 ;;; gnus-topic.el --- a folding minor mode for Gnus group buffers
   2
   3 ;; Copyright (C) 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003,
   4 ;;   2004, 2005, 2006 Free Software Foundation, Inc.
   5
   6 ;; Author: Ilja Weis <kult@uni-paderborn.de>
   7 ;;      Lars Magne Ingebrigtsen <larsi@gnus.org>
   8 ;; Keywords: news
   9
  10 ;; This file is part of GNU Emacs.
  11
  12 ;; GNU Emacs is free software; you can redistribute it and/or modify
  13 ;; it under the terms of the GNU General Public License as published by
  14 ;; the Free Software Foundation; either version 2, or (at your option)
  15 ;; any later version.
  16
  17 ;; GNU Emacs is distributed in the hope that it will be useful,
  18 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  19 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20 ;; GNU General Public License for more details.
  21
  22 ;; You should have received a copy of the GNU General Public License
  23 ;; along with GNU Emacs; see the file COPYING.  If not, write to the
  24 ;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  25 ;; Boston, MA 02110-1301, USA.
  26
  27 ;;; Commentary:
  28
  29 ;;; Code:
  30
  31 (eval-when-compile (require 'cl))
  32
  33 (require 'gnus)
  34 (require 'gnus-group)
  35 (require 'gnus-start)
  36 (require 'gnus-util)
  37
  38 (defgroup gnus-topic nil
  39   "Group topics."
  40   :group 'gnus-group)
  41
  42 (defvar gnus-topic-mode nil
  43   "Minor mode for Gnus group buffers.")
  44
  45 (defcustom gnus-topic-mode-hook nil
  46   "Hook run in topic mode buffers."
  47   :type 'hook
  48   :group 'gnus-topic)
  49
  50 (when (featurep 'xemacs)
  51   (add-hook 'gnus-topic-mode-hook 'gnus-xmas-topic-menu-add))
  52
  53 (defcustom gnus-topic-line-format "%i[ %(%{%n%}%) -- %A ]%v\n"
  54   "Format of topic lines.
  55 It works along the same lines as a normal formatting string,
  56 with some simple extensions.
  57
  58 %i  Indentation based on topic level.
  59 %n  Topic name.
  60 %v  Nothing if the topic is visible, \"...\" otherwise.
  61 %g  Number of groups in the topic.
  62 %a  Number of unread articles in the groups in the topic.
  63 %A  Number of unread articles in the groups in the topic and its subtopics.
  64
  65 General format specifiers can also be used.
  66 See Info node `(gnus)Formatting Variables'."
  67   :link '(custom-manual "(gnus)Formatting Variables")
  68   :type 'string
  69   :group 'gnus-topic)
  70
  71 (defcustom gnus-topic-indent-level 2
  72   "*How much each subtopic should be indented."
  73   :type 'integer
  74   :group 'gnus-topic)
  75
  76 (defcustom gnus-topic-display-empty-topics t
  77   "*If non-nil, display the topic lines even of topics that have no unread articles."
  78   :type 'boolean
  79   :group 'gnus-topic)
  80
  81 ;; Internal variables.
  82
  83 (defvar gnus-topic-active-topology nil)
  84 (defvar gnus-topic-active-alist nil)
  85 (defvar gnus-topic-unreads nil)
  86
  87 (defvar gnus-topology-checked-p nil
  88   "Whether the topology has been checked in this session.")
  89
  90 (defvar gnus-topic-killed-topics nil)
  91 (defvar gnus-topic-inhibit-change-level nil)
  92
  93 (defconst gnus-topic-line-format-alist
  94   `((?n name ?s)
  95     (?v visible ?s)
  96     (?i indentation ?s)
  97     (?g number-of-groups ?d)
  98     (?a (gnus-topic-articles-in-topic entries) ?d)
  99     (?A total-number-of-articles ?d)
 100     (?l level ?d)))
 101
 102 (defvar gnus-topic-line-format-spec nil)
 103
 104 ;;; Utility functions
 105
 106 (defun gnus-group-topic-name ()
 107   "The name of the topic on the current line."
 108   (let ((topic (get-text-property (gnus-point-at-bol) 'gnus-topic)))
 109     (and topic (symbol-name topic))))
 110
 111 (defun gnus-group-topic-level ()
 112   "The level of the topic on the current line."
 113   (get-text-property (gnus-point-at-bol) 'gnus-topic-level))
 114
 115 (defun gnus-group-topic-unread ()
 116   "The number of unread articles in topic on the current line."
 117   (get-text-property (gnus-point-at-bol) 'gnus-topic-unread))
 118
 119 (defun gnus-topic-unread (topic)
 120   "Return the number of unread articles in TOPIC."
 121   (or (cdr (assoc topic gnus-topic-unreads))
 122       0))
 123
 124 (defun gnus-group-topic-p ()
 125   "Return non-nil if the current line is a topic."
 126   (gnus-group-topic-name))
 127
 128 (defun gnus-topic-visible-p ()
 129   "Return non-nil if the current topic is visible."
 130   (get-text-property (gnus-point-at-bol) 'gnus-topic-visible))
 131
 132 (defun gnus-topic-articles-in-topic (entries)
 133   (let ((total 0)
 134         number)
 135     (while entries
 136       (when (numberp (setq number (car (pop entries))))
 137         (incf total number)))
 138     total))
 139
 140 (defun gnus-group-topic (group)
 141   "Return the topic GROUP is a member of."
 142   (let ((alist gnus-topic-alist)
 143         out)
 144     (while alist
 145       (when (member group (cdar alist))
 146         (setq out (caar alist)
 147               alist nil))
 148       (setq alist (cdr alist)))
 149     out))
 150
 151 (defun gnus-group-parent-topic (group)
 152   "Return the topic GROUP is member of by looking at the group buffer."
 153   (save-excursion
 154     (set-buffer gnus-group-buffer)
 155     (if (gnus-group-goto-group group)
 156         (gnus-current-topic)
 157       (gnus-group-topic group))))
 158
 159 (defun gnus-topic-goto-topic (topic)
 160   (when topic
 161     (gnus-goto-char (text-property-any (point-min) (point-max)
 162                                        'gnus-topic (intern topic)))))
 163
 164 (defun gnus-topic-jump-to-topic (topic)
 165   "Go to TOPIC."
 166   (interactive
 167    (list (completing-read "Go to topic: "
 168                           (mapcar 'list (gnus-topic-list))
 169                           nil t)))
 170   (dolist (topic (gnus-current-topics topic))
 171     (gnus-topic-goto-topic topic)
 172     (gnus-topic-fold t))
 173   (gnus-topic-goto-topic topic))
 174
 175 (defun gnus-current-topic ()
 176   "Return the name of the current topic."
 177   (let ((result
 178          (or (get-text-property (point) 'gnus-topic)
 179              (save-excursion
 180                (and (gnus-goto-char (previous-single-property-change
 181                                      (point) 'gnus-topic))
 182                     (get-text-property (max (1- (point)) (point-min))
 183                                        'gnus-topic))))))
 184     (when result
 185       (symbol-name result))))
 186
 187 (defun gnus-current-topics (&optional topic)
 188   "Return a list of all current topics, lowest in hierarchy first.
 189 If TOPIC, start with that topic."
 190   (let ((topic (or topic (gnus-current-topic)))
 191         topics)
 192     (while topic
 193       (push topic topics)
 194       (setq topic (gnus-topic-parent-topic topic)))
 195     (nreverse topics)))
 196
 197 (defun gnus-group-active-topic-p ()
 198   "Say whether the current topic comes from the active topics."
 199   (save-excursion
 200     (beginning-of-line)
 201     (get-text-property (point) 'gnus-active)))
 202
 203 (defun gnus-topic-find-groups (topic &optional level all lowest recursive)
 204   "Return entries for all visible groups in TOPIC.
 205 If RECURSIVE is t, return groups in its subtopics too."
 206   (let ((groups (cdr (assoc topic gnus-topic-alist)))
 207         info clevel unread group params visible-groups entry active)
 208     (setq lowest (or lowest 1))
 209     (setq level (or level gnus-level-unsubscribed))
 210     ;; We go through the newsrc to look for matches.
 211     (while groups
 212       (when (setq group (pop groups))
 213         (setq entry (gnus-gethash group gnus-newsrc-hashtb)
 214               info (nth 2 entry)
 215               params (gnus-info-params info)
 216               active (gnus-active group)
 217               unread (or (car entry)
 218                          (and (not (equal group "dummy.group"))
 219                               active
 220                               (- (1+ (cdr active)) (car active))))
 221               clevel (or (gnus-info-level info)
 222                          (if (member group gnus-zombie-list)
 223                              gnus-level-zombie gnus-level-killed))))
 224       (and
 225        info                             ; nil means that the group is dead.
 226        (<= clevel level)
 227        (>= clevel lowest)               ; Is inside the level we want.
 228        (or all
 229            (if (or (eq unread t)
 230                    (eq unread nil))
 231                gnus-group-list-inactive-groups
 232              (> unread 0))
 233            (and gnus-list-groups-with-ticked-articles
 234                 (cdr (assq 'tick (gnus-info-marks info))))
 235            ;; Has right readedness.
 236            ;; Check for permanent visibility.
 237            (and gnus-permanently-visible-groups
 238                 (string-match gnus-permanently-visible-groups group))
 239            (memq 'visible params)
 240            (cdr (assq 'visible params)))
 241        ;; Add this group to the list of visible groups.
 242        (push (or entry group) visible-groups)))
 243     (setq visible-groups (nreverse visible-groups))
 244     (when recursive
 245       (if (eq recursive t)
 246           (setq recursive (cdr (gnus-topic-find-topology topic))))
 247       (mapcar (lambda (topic-topology)
 248                 (setq visible-groups
 249                       (nconc visible-groups
 250                              (gnus-topic-find-groups
 251                               (caar topic-topology)
 252                               level all lowest topic-topology))))
 253               (cdr recursive)))
 254     visible-groups))
 255
 256 (defun gnus-topic-goto-previous-topic (n)
 257   "Go to the N'th previous topic."
 258   (interactive "p")
 259   (gnus-topic-goto-next-topic (- n)))
 260
 261 (defun gnus-topic-goto-next-topic (n)
 262   "Go to the N'th next topic."
 263   (interactive "p")
 264   (let ((backward (< n 0))
 265         (n (abs n))
 266         (topic (gnus-current-topic)))
 267     (while (and (> n 0)
 268                 (setq topic
 269                       (if backward
 270                           (gnus-topic-previous-topic topic)
 271                         (gnus-topic-next-topic topic))))
 272       (gnus-topic-goto-topic topic)
 273       (setq n (1- n)))
 274     (when (/= 0 n)
 275       (gnus-message 7 "No more topics"))
 276     n))
 277
 278 (defun gnus-topic-previous-topic (topic)
 279   "Return the previous topic on the same level as TOPIC."
 280   (let ((top (cddr (gnus-topic-find-topology
 281                     (gnus-topic-parent-topic topic)))))
 282     (unless (equal topic (caaar top))
 283       (while (and top (not (equal (caaadr top) topic)))
 284         (setq top (cdr top)))
 285       (caaar top))))
 286
 287 (defun gnus-topic-parent-topic (topic &optional topology)
 288   "Return the parent of TOPIC."
 289   (unless topology
 290     (setq topology gnus-topic-topology))
 291   (let ((parent (car (pop topology)))
 292         result found)
 293     (while (and topology
 294                 (not (setq found (equal (caaar topology) topic)))
 295                 (not (setq result (gnus-topic-parent-topic
 296                                    topic (car topology)))))
 297       (setq topology (cdr topology)))
 298     (or result (and found parent))))
 299
 300 (defun gnus-topic-next-topic (topic &optional previous)
 301   "Return the next sibling of TOPIC."
 302   (let ((parentt (cddr (gnus-topic-find-topology
 303                         (gnus-topic-parent-topic topic))))
 304         prev)
 305     (while (and parentt
 306                 (not (equal (caaar parentt) topic)))
 307       (setq prev (caaar parentt)
 308             parentt (cdr parentt)))
 309     (if previous
 310         prev
 311       (caaadr parentt))))
 312
 313 (defun gnus-topic-forward-topic (num)
 314   "Go to the next topic on the same level as the current one."
 315   (let* ((topic (gnus-current-topic))
 316          (way (if (< num 0) 'gnus-topic-previous-topic
 317                 'gnus-topic-next-topic))
 318          (num (abs num)))
 319     (while (and (not (zerop num))
 320                 (setq topic (funcall way topic)))
 321       (when (gnus-topic-goto-topic topic)
 322         (decf num)))
 323     (unless (zerop num)
 324       (goto-char (point-max)))
 325     num))
 326
 327 (defun gnus-topic-find-topology (topic &optional topology level remove)
 328   "Return the topology of TOPIC."
 329   (unless topology
 330     (setq topology gnus-topic-topology)
 331     (setq level 0))
 332   (let ((top topology)
 333         result)
 334     (if (equal (caar topology) topic)
 335         (progn
 336           (when remove
 337             (delq topology remove))
 338           (cons level topology))
 339       (setq topology (cdr topology))
 340       (while (and topology
 341                   (not (setq result (gnus-topic-find-topology
 342                                      topic (car topology) (1+ level)
 343                                      (and remove top)))))
 344         (setq topology (cdr topology)))
 345       result)))
 346
 347 (defvar gnus-tmp-topics nil)
 348 (defun gnus-topic-list (&optional topology)
 349   "Return a list of all topics in the topology."
 350   (unless topology
 351     (setq topology gnus-topic-topology
 352           gnus-tmp-topics nil))
 353   (push (caar topology) gnus-tmp-topics)
 354   (mapcar 'gnus-topic-list (cdr topology))
 355   gnus-tmp-topics)
 356
 357 ;;; Topic parameter jazz
 358
 359 (defun gnus-topic-parameters (topic)
 360   "Return the parameters for TOPIC."
 361   (let ((top (gnus-topic-find-topology topic)))
 362     (when top
 363       (nth 3 (cadr top)))))
 364
 365 (defun gnus-topic-set-parameters (topic parameters)
 366   "Set the topic parameters of TOPIC to PARAMETERS."
 367   (let ((top (gnus-topic-find-topology topic)))
 368     (unless top
 369       (error "No such topic: %s" topic))
 370     ;; We may have to extend if there is no parameters here
 371     ;; to begin with.
 372     (unless (nthcdr 2 (cadr top))
 373       (nconc (cadr top) (list nil)))
 374     (unless (nthcdr 3 (cadr top))
 375       (nconc (cadr top) (list nil)))
 376     (setcar (nthcdr 3 (cadr top)) parameters)
 377     (gnus-dribble-enter
 378      (format "(gnus-topic-set-parameters %S '%S)" topic parameters))))
 379
 380 (defun gnus-group-topic-parameters (group)
 381   "Compute the group parameters for GROUP taking into account inheritance from topics."
 382   (let ((params-list (copy-sequence (gnus-group-get-parameter group))))
 383     (save-excursion
 384       (nconc params-list
 385              (gnus-topic-hierarchical-parameters
 386               ;; First we try to go to the group within the group
 387               ;; buffer and find the topic for the group that way.
 388               ;; This hopefully copes well with groups that are in
 389               ;; more than one topic.  Failing that (i.e. when the
 390               ;; group isn't visible in the group buffer) we find a
 391               ;; topic for the group via gnus-group-topic.
 392               (or (and (gnus-group-goto-group group)
 393                        (gnus-current-topic))
 394                   (gnus-group-topic group)))))))
 395
 396 (defun gnus-topic-hierarchical-parameters (topic)
 397   "Return a topic list computed for TOPIC."
 398   (let ((topics (gnus-current-topics topic))
 399         params-list param out params)
 400     (while topics
 401       (push (gnus-topic-parameters (pop topics)) params-list))
 402     ;; We probably have lots of nil elements here, so
 403     ;; we remove them.  Probably faster than doing this "properly".
 404     (setq params-list (delq nil params-list))
 405     ;; Now we have all the parameters, so we go through them
 406     ;; and do inheritance in the obvious way.
 407     (while (setq params (pop params-list))
 408       (while (setq param (pop params))
 409         (when (atom param)
 410           (setq param (cons param t)))
 411         ;; Override any old versions of this param.
 412         (gnus-pull (car param) out)
 413         (push param out)))
 414     ;; Return the resulting parameter list.
 415     out))
 416
 417 ;;; General utility functions
 418
 419 (defun gnus-topic-enter-dribble ()
 420   (gnus-dribble-enter
 421    (format "(setq gnus-topic-topology '%S)" gnus-topic-topology)))
 422
 423 ;;; Generating group buffers
 424
 425 (defun gnus-group-prepare-topics (level &optional predicate lowest
 426                                         regexp list-topic topic-level)
 427   "List all newsgroups with unread articles of level LEVEL or lower.
 428 Use the `gnus-group-topics' to sort the groups.
 429 If PREDICTE is a function, list groups that the function returns non-nil;
 430 if it is t, list groups that have no unread articles.
 431 If LOWEST is non-nil, list all newsgroups of level LOWEST or higher."
 432   (set-buffer gnus-group-buffer)
 433   (let ((buffer-read-only nil)
 434         (lowest (or lowest 1))
 435         (not-in-list
 436          (and gnus-group-listed-groups
 437               (copy-sequence gnus-group-listed-groups))))
 438
 439     (gnus-update-format-specifications nil 'topic)
 440
 441     (when (or (not gnus-topic-alist)
 442               (not gnus-topology-checked-p))
 443       (gnus-topic-check-topology))
 444
 445     (unless list-topic
 446       (erase-buffer))
 447
 448     ;; List dead groups?
 449     (when (or gnus-group-listed-groups
 450               (and (>= level gnus-level-zombie)
 451                    (<= lowest gnus-level-zombie)))
 452       (gnus-group-prepare-flat-list-dead
 453        (setq gnus-zombie-list (sort gnus-zombie-list 'string<))
 454        gnus-level-zombie ?Z
 455        regexp))
 456
 457     (when (or gnus-group-listed-groups
 458                (and (>= level gnus-level-killed)
 459                     (<= lowest gnus-level-killed)))
 460       (gnus-group-prepare-flat-list-dead
 461        (setq gnus-killed-list (sort gnus-killed-list 'string<))
 462        gnus-level-killed ?K regexp)
 463       (when not-in-list
 464         (unless gnus-killed-hashtb
 465           (gnus-make-hashtable-from-killed))
 466         (gnus-group-prepare-flat-list-dead
 467          (gnus-remove-if (lambda (group)
 468                            (or (gnus-gethash group gnus-newsrc-hashtb)
 469                                (gnus-gethash group gnus-killed-hashtb)))
 470                          not-in-list)
 471          gnus-level-killed ?K regexp)))
 472
 473     ;; Use topics.
 474     (prog1
 475         (when (or (< lowest gnus-level-zombie)
 476                   gnus-group-listed-groups)
 477           (if list-topic
 478               (let ((top (gnus-topic-find-topology list-topic)))
 479                 (gnus-topic-prepare-topic (cdr top) (car top)
 480                                           (or topic-level level) predicate
 481                                           nil lowest regexp))
 482             (gnus-topic-prepare-topic gnus-topic-topology 0
 483                                       (or topic-level level) predicate
 484                                       nil lowest regexp)))
 485       (gnus-group-set-mode-line)
 486       (setq gnus-group-list-mode (cons level predicate))
 487       (gnus-run-hooks 'gnus-group-prepare-hook))))
 488
 489 (defun gnus-topic-prepare-topic (topicl level &optional list-level
 490                                         predicate silent
 491                                         lowest regexp)
 492   "Insert TOPIC into the group buffer.
 493 If SILENT, don't insert anything.  Return the number of unread
 494 articles in the topic and its subtopics."
 495   (let* ((type (pop topicl))
 496          (entries (gnus-topic-find-groups
 497                    (car type)
 498                    (if gnus-group-listed-groups
 499                        gnus-level-killed
 500                      list-level)
 501                    (or predicate gnus-group-listed-groups
 502                        (cdr (assq 'visible
 503                                   (gnus-topic-hierarchical-parameters
 504                                    (car type)))))
 505                    (if gnus-group-listed-groups 0 lowest)))
 506          (visiblep (and (eq (nth 1 type) 'visible) (not silent)))
 507          (gnus-group-indentation
 508           (make-string (* gnus-topic-indent-level level) ? ))
 509          (beg (progn (beginning-of-line) (point)))
 510          (topicl (reverse topicl))
 511          (all-entries entries)
 512          (point-max (point-max))
 513          (unread 0)
 514          (topic (car type))
 515          info entry end active tick)
 516     ;; Insert any sub-topics.
 517     (while topicl
 518       (incf unread
 519             (gnus-topic-prepare-topic
 520              (pop topicl) (1+ level) list-level predicate
 521              (not visiblep) lowest regexp)))
 522     (setq end (point))
 523     (goto-char beg)
 524     ;; Insert all the groups that belong in this topic.
 525     (while (setq entry (pop entries))
 526       (when (if (stringp entry)
 527                 (gnus-group-prepare-logic
 528                  entry
 529                  (and
 530                   (or (not gnus-group-listed-groups)
 531                       (if (< list-level gnus-level-zombie) nil
 532                         (let ((entry-level
 533                                (if (member entry gnus-zombie-list)
 534                                    gnus-level-zombie gnus-level-killed)))
 535                           (and (<= entry-level list-level)
 536                                (>= entry-level lowest)))))
 537                   (cond
 538                    ((stringp regexp)
 539                     (string-match regexp entry))
 540                    ((functionp regexp)
 541                     (funcall regexp entry))
 542                    ((null regexp) t)
 543                    (t nil))))
 544               (setq info (nth 2 entry))
 545               (gnus-group-prepare-logic
 546                (gnus-info-group info)
 547                (and (or (not gnus-group-listed-groups)
 548                         (let ((entry-level (gnus-info-level info)))
 549                           (and (<= entry-level list-level)
 550                                (>= entry-level lowest))))
 551                     (or (not (functionp predicate))
 552                         (funcall predicate info))
 553                     (or (not (stringp regexp))
 554                         (string-match regexp (gnus-info-group info))))))
 555         (when visiblep
 556           (if (stringp entry)
 557               ;; Dead groups.
 558               (gnus-group-insert-group-line
 559                entry (if (member entry gnus-zombie-list)
 560                          gnus-level-zombie gnus-level-killed)
 561                nil (- (1+ (cdr (setq active (gnus-active entry))))
 562                       (car active))
 563                nil)
 564             ;; Living groups.
 565             (when (setq info (nth 2 entry))
 566               (gnus-group-insert-group-line
 567                (gnus-info-group info)
 568                (gnus-info-level info) (gnus-info-marks info)
 569                (car entry) (gnus-info-method info)))))
 570         (when (and (listp entry)
 571                    (numberp (car entry)))
 572           (incf unread (car entry)))
 573         (when (listp entry)
 574           (setq tick t))))
 575     (goto-char beg)
 576     ;; Insert the topic line.
 577     (when (and (not silent)
 578                (or gnus-topic-display-empty-topics ;We want empty topics
 579                    (not (zerop unread)) ;Non-empty
 580                    tick                 ;Ticked articles
 581                    (/= point-max (point-max)))) ;Unactivated groups
 582       (gnus-extent-start-open (point))
 583       (gnus-topic-insert-topic-line
 584        (car type) visiblep
 585        (not (eq (nth 2 type) 'hidden))
 586        level all-entries unread))
 587     (gnus-topic-update-unreads (car type) unread)
 588     (goto-char end)
 589     unread))
 590
 591 (defun gnus-topic-remove-topic (&optional insert total-remove hide in-level)
 592   "Remove the current topic."
 593   (let ((topic (gnus-group-topic-name))
 594         (level (gnus-group-topic-level))
 595         (beg (progn (beginning-of-line) (point)))
 596         buffer-read-only)
 597     (when topic
 598       (while (and (zerop (forward-line 1))
 599                   (> (or (gnus-group-topic-level) (1+ level)) level)))
 600       (delete-region beg (point))
 601       ;; Do the change in this rather odd manner because it has been
 602       ;; reported that some topics share parts of some lists, for some
 603       ;; reason.  I have been unable to determine why this is the
 604       ;; case, but this hack seems to take care of things.
 605       (let ((data (cadr (gnus-topic-find-topology topic))))
 606         (setcdr data
 607                 (list (if insert 'visible 'invisible)
 608                       (caddr data)
 609                       (cadddr data))))
 610       (if total-remove
 611           (setq gnus-topic-alist
 612                 (delq (assoc topic gnus-topic-alist) gnus-topic-alist))
 613         (gnus-topic-insert-topic topic in-level)))))
 614
 615 (defun gnus-topic-insert-topic (topic &optional level)
 616   "Insert TOPIC."
 617   (gnus-group-prepare-topics
 618    (car gnus-group-list-mode) (cdr gnus-group-list-mode)
 619    nil nil topic level))
 620
 621 (defun gnus-topic-fold (&optional insert topic)
 622   "Remove/insert the current topic."
 623   (let ((topic (or topic (gnus-group-topic-name))))
 624     (when topic
 625       (save-excursion
 626         (if (not (gnus-group-active-topic-p))
 627             (gnus-topic-remove-topic
 628              (or insert (not (gnus-topic-visible-p))))
 629           (let ((gnus-topic-topology gnus-topic-active-topology)
 630                 (gnus-topic-alist gnus-topic-active-alist)
 631                 (gnus-group-list-mode (cons 5 t)))
 632             (gnus-topic-remove-topic
 633              (or insert (not (gnus-topic-visible-p))) nil nil 9)
 634             (gnus-topic-enter-dribble)))))))
 635
 636 (defun gnus-topic-insert-topic-line (name visiblep shownp level entries
 637                                           &optional unread)
 638   (let* ((visible (if visiblep "" "..."))
 639          (indentation (make-string (* gnus-topic-indent-level level) ? ))
 640          (total-number-of-articles unread)
 641          (number-of-groups (length entries))
 642          (active-topic (eq gnus-topic-alist gnus-topic-active-alist))
 643          gnus-tmp-header)
 644     (gnus-topic-update-unreads name unread)
 645     (beginning-of-line)
 646     ;; Insert the text.
 647     (if shownp
 648         (gnus-add-text-properties
 649          (point)
 650          (prog1 (1+ (point))
 651            (eval gnus-topic-line-format-spec))
 652          (list 'gnus-topic (intern name)
 653                'gnus-topic-level level
 654                'gnus-topic-unread unread
 655                'gnus-active active-topic
 656                'gnus-topic-visible visiblep)))))
 657
 658 (defun gnus-topic-update-unreads (topic unreads)
 659   (setq gnus-topic-unreads (delq (assoc topic gnus-topic-unreads)
 660                                  gnus-topic-unreads))
 661   (push (cons topic unreads) gnus-topic-unreads))
 662
 663 (defun gnus-topic-update-topics-containing-group (group)
 664   "Update all topics that have GROUP as a member."
 665   (when (and (eq major-mode 'gnus-group-mode)
 666              gnus-topic-mode)
 667     (save-excursion
 668       (let ((alist gnus-topic-alist))
 669         ;; This is probably not entirely correct.  If a topic
 670         ;; isn't shown, then it's not updated.  But the updating
 671         ;; should be performed in any case, since the topic's
 672         ;; parent should be updated.  Pfft.
 673         (while alist
 674           (when (and (member group (cdar alist))
 675                      (gnus-topic-goto-topic (caar alist)))
 676             (gnus-topic-update-topic-line (caar alist)))
 677           (pop alist))))))
 678
 679 (defun gnus-topic-update-topic ()
 680   "Update all parent topics to the current group."
 681   (when (and (eq major-mode 'gnus-group-mode)
 682              gnus-topic-mode)
 683     (let ((group (gnus-group-group-name))
 684           (m (point-marker))
 685           (buffer-read-only nil))
 686       (when (and group
 687                  (gnus-get-info group)
 688                  (gnus-topic-goto-topic (gnus-current-topic)))
 689         (gnus-topic-update-topic-line (gnus-group-topic-name))
 690         (goto-char m)
 691         (set-marker m nil)
 692         (gnus-group-position-point)))))
 693
 694 (defun gnus-topic-goto-missing-group (group)
 695   "Place point where GROUP is supposed to be inserted."
 696   (let* ((topic (gnus-group-topic group))
 697          (groups (cdr (assoc topic gnus-topic-alist)))
 698          (g (cdr (member group groups)))
 699          (unfound t)
 700          entry)
 701     ;; Try to jump to a visible group.
 702     (while (and g
 703                 (not (gnus-group-goto-group (car g) t)))
 704       (pop g))
 705     ;; It wasn't visible, so we try to see where to insert it.
 706     (when (not g)
 707       (setq g (cdr (member group (reverse groups))))
 708       (while (and g unfound)
 709         (when (gnus-group-goto-group (pop g) t)
 710           (forward-line 1)
 711           (setq unfound nil)))
 712       (when (and unfound
 713                  topic
 714                  (not (gnus-topic-goto-missing-topic topic)))
 715         (gnus-topic-display-missing-topic topic)))))
 716
 717 (defun gnus-topic-display-missing-topic (topic)
 718   "Insert topic lines recursively for missing topics."
 719   (let ((parent (gnus-topic-find-topology
 720                  (gnus-topic-parent-topic topic))))
 721     (when (and parent
 722                (not (gnus-topic-goto-missing-topic (caadr parent))))
 723       (gnus-topic-display-missing-topic (caadr parent))))
 724   (gnus-topic-goto-missing-topic topic)
 725   (let* ((top (gnus-topic-find-topology topic))
 726          (children (cddr top))
 727          (type (cadr top))
 728          (unread 0)
 729          (entries (gnus-topic-find-groups
 730                    (car type) (car gnus-group-list-mode)
 731                    (cdr gnus-group-list-mode)))
 732         entry)
 733     (while children
 734       (incf unread (gnus-topic-unread (caar (pop children)))))
 735     (while (setq entry (pop entries))
 736       (when (numberp (car entry))
 737         (incf unread (car entry))))
 738     (gnus-topic-insert-topic-line
 739      topic t t (car (gnus-topic-find-topology topic)) nil unread)))
 740
 741 (defun gnus-topic-goto-missing-topic (topic)
 742   (if (gnus-topic-goto-topic topic)
 743       (forward-line 1)
 744     ;; Topic not displayed.
 745     (let* ((top (gnus-topic-find-topology
 746                  (gnus-topic-parent-topic topic)))
 747            (tp (reverse (cddr top))))
 748       (if (not top)
 749           (gnus-topic-insert-topic-line
 750            topic t t (car (gnus-topic-find-topology topic)) nil 0)
 751         (while (not (equal (caaar tp) topic))
 752           (setq tp (cdr tp)))
 753         (pop tp)
 754         (while (and tp
 755                     (not (gnus-topic-goto-topic (caaar tp))))
 756           (pop tp))
 757         (if tp
 758             (gnus-topic-forward-topic 1)
 759           (gnus-topic-goto-missing-topic (caadr top)))))
 760     nil))
 761
 762 (defun gnus-topic-update-topic-line (topic-name &optional reads)
 763   (let* ((top (gnus-topic-find-topology topic-name))
 764          (type (cadr top))
 765          (children (cddr top))
 766          (entries (gnus-topic-find-groups
 767                    (car type) (car gnus-group-list-mode)
 768                    (cdr gnus-group-list-mode)))
 769          (parent (gnus-topic-parent-topic topic-name))
 770          (all-entries entries)
 771          (unread 0)
 772          old-unread entry new-unread)
 773     (when (gnus-topic-goto-topic (car type))
 774       ;; Tally all the groups that belong in this topic.
 775       (if reads
 776           (setq unread (- (gnus-group-topic-unread) reads))
 777         (while children
 778           (incf unread (gnus-topic-unread (caar (pop children)))))
 779         (while (setq entry (pop entries))
 780           (when (numberp (car entry))
 781             (incf unread (car entry)))))
 782       (setq old-unread (gnus-group-topic-unread))
 783       ;; Insert the topic line.
 784       (gnus-topic-insert-topic-line
 785        (car type) (gnus-topic-visible-p)
 786        (not (eq (nth 2 type) 'hidden))
 787        (gnus-group-topic-level) all-entries unread)
 788       (gnus-delete-line)
 789       (forward-line -1)
 790       (setq new-unread (gnus-group-topic-unread)))
 791     (when parent
 792       (forward-line -1)
 793       (gnus-topic-update-topic-line
 794        parent
 795        (- (or old-unread 0) (or new-unread 0))))
 796     unread))
 797
 798 (defun gnus-topic-group-indentation ()
 799   (make-string
 800    (* gnus-topic-indent-level
 801       (or (save-excursion
 802             (forward-line -1)
 803             (gnus-topic-goto-topic (gnus-current-topic))
 804             (gnus-group-topic-level))
 805           0))
 806    ? ))
 807
 808 ;;; Initialization
 809
 810 (gnus-add-shutdown 'gnus-topic-close 'gnus)
 811
 812 (defun gnus-topic-close ()
 813   (setq gnus-topic-active-topology nil
 814         gnus-topic-active-alist nil
 815         gnus-topic-killed-topics nil
 816         gnus-topology-checked-p nil))
 817
 818 (defun gnus-topic-check-topology ()
 819   ;; The first time we set the topology to whatever we have
 820   ;; gotten here, which can be rather random.
 821   (unless gnus-topic-alist
 822     (gnus-topic-init-alist))
 823
 824   (setq gnus-topology-checked-p t)
 825   ;; Go through the topic alist and make sure that all topics
 826   ;; are in the topic topology.
 827   (let ((topics (gnus-topic-list))
 828         (alist gnus-topic-alist)
 829         changed)
 830     (while alist
 831       (unless (member (caar alist) topics)
 832         (nconc gnus-topic-topology
 833                (list (list (list (caar alist) 'visible))))
 834         (setq changed t))
 835       (setq alist (cdr alist)))
 836     (when changed
 837       (gnus-topic-enter-dribble))
 838     ;; Conversely, go through the topology and make sure that all
 839     ;; topologies have alists.
 840     (while topics
 841       (unless (assoc (car topics) gnus-topic-alist)
 842         (push (list (car topics)) gnus-topic-alist))
 843       (pop topics)))
 844   ;; Go through all living groups and make sure that
 845   ;; they belong to some topic.
 846   (let* ((tgroups (apply 'append (mapcar (lambda (entry) (cdr entry))
 847                                          gnus-topic-alist)))
 848          (entry (last (assoc (caar gnus-topic-topology) gnus-topic-alist)))
 849          (newsrc (cdr gnus-newsrc-alist))
 850          group)
 851     (while newsrc
 852       (unless (member (setq group (gnus-info-group (pop newsrc))) tgroups)
 853         (setcdr entry (list group))
 854         (setq entry (cdr entry)))))
 855   ;; Go through all topics and make sure they contain only living groups.
 856   (let ((alist gnus-topic-alist)
 857         topic)
 858     (while (setq topic (pop alist))
 859       (while (cdr topic)
 860         (if (and (cadr topic)
 861                  (gnus-gethash (cadr topic) gnus-newsrc-hashtb))
 862             (setq topic (cdr topic))
 863           (setcdr topic (cddr topic)))))))
 864
 865 (defun gnus-topic-init-alist ()
 866   "Initialize the topic structures."
 867   (setq gnus-topic-topology
 868         (cons (list "Gnus" 'visible)
 869               (mapcar (lambda (topic)
 870                         (list (list (car topic) 'visible)))
 871                       '(("misc")))))
 872   (setq gnus-topic-alist
 873         (list (cons "misc"
 874                     (mapcar (lambda (info) (gnus-info-group info))
 875                             (cdr gnus-newsrc-alist)))
 876               (list "Gnus")))
 877   (gnus-topic-enter-dribble))
 878
 879 ;;; Maintenance
 880
 881 (defun gnus-topic-clean-alist ()
 882   "Remove bogus groups from the topic alist."
 883   (let ((topic-alist gnus-topic-alist)
 884         result topic)
 885     (unless gnus-killed-hashtb
 886       (gnus-make-hashtable-from-killed))
 887     (while (setq topic (pop topic-alist))
 888       (let ((topic-name (pop topic))
 889             group filtered-topic)
 890         (while (setq group (pop topic))
 891           (when (and (or (gnus-gethash group gnus-active-hashtb)
 892                          (gnus-info-method (gnus-get-info group)))
 893                      (not (gnus-gethash group gnus-killed-hashtb)))
 894             (push group filtered-topic)))
 895         (push (cons topic-name (nreverse filtered-topic)) result)))
 896     (setq gnus-topic-alist (nreverse result))))
 897
 898 (defun gnus-topic-change-level (group level oldlevel &optional previous)
 899   "Run when changing levels to enter/remove groups from topics."
 900   (save-excursion
 901     (set-buffer gnus-group-buffer)
 902     (let ((buffer-read-only nil))
 903       (unless gnus-topic-inhibit-change-level
 904         (gnus-group-goto-group (or (car (nth 2 previous)) group))
 905         (when (and gnus-topic-mode
 906                    gnus-topic-alist
 907                    (not gnus-topic-inhibit-change-level))
 908           ;; Remove the group from the topics.
 909           (if (and (< oldlevel gnus-level-zombie)
 910                    (>= level gnus-level-zombie))
 911               (let ((alist gnus-topic-alist))
 912                 (while (gnus-group-goto-group group)
 913                   (gnus-delete-line))
 914                 (while alist
 915                   (when (member group (car alist))
 916                     (setcdr (car alist) (delete group (cdar alist))))
 917                   (pop alist)))
 918             ;; If the group is subscribed we enter it into the topics.
 919             (when (and (< level gnus-level-zombie)
 920                        (>= oldlevel gnus-level-zombie))
 921               (let* ((prev (gnus-group-group-name))
 922                      (gnus-topic-inhibit-change-level t)
 923                      (gnus-group-indentation
 924                       (make-string
 925                        (* gnus-topic-indent-level
 926                           (or (save-excursion
 927                                 (gnus-topic-goto-topic (gnus-current-topic))
 928                                 (gnus-group-topic-level))
 929                               0))
 930                        ? ))
 931                      (yanked (list group))
 932                      alist talist end)
 933                 ;; Then we enter the yanked groups into the topics
 934                 ;; they belong to.
 935                 (when (setq alist (assoc (save-excursion
 936                                            (forward-line -1)
 937                                            (or
 938                                             (gnus-current-topic)
 939                                             (caar gnus-topic-topology)))
 940                                          gnus-topic-alist))
 941                   (setq talist alist)
 942                   (when (stringp yanked)
 943                     (setq yanked (list yanked)))
 944                   (if (not prev)
 945                       (nconc alist yanked)
 946                     (if (not (cdr alist))
 947                         (setcdr alist (nconc yanked (cdr alist)))
 948                       (while (and (not end) (cdr alist))
 949                         (when (equal (cadr alist) prev)
 950                           (setcdr alist (nconc yanked (cdr alist)))
 951                           (setq end t))
 952                         (setq alist (cdr alist)))
 953                       (unless end
 954                         (nconc talist yanked))))))
 955               (gnus-topic-update-topic))))))))
 956
 957 (defun gnus-topic-goto-next-group (group props)
 958   "Go to group or the next group after group."
 959   (if (not group)
 960       (if (not (memq 'gnus-topic props))
 961           (goto-char (point-max))
 962         (gnus-topic-goto-topic (symbol-name (cadr (memq 'gnus-topic props)))))
 963     (if (gnus-group-goto-group group)
 964         t
 965       ;; The group is no longer visible.
 966       (let* ((list (assoc (gnus-group-topic group) gnus-topic-alist))
 967              (after (cdr (member group (cdr list)))))
 968         ;; First try to put point on a group after the current one.
 969         (while (and after
 970                     (not (gnus-group-goto-group (car after))))
 971           (setq after (cdr after)))
 972         ;; Then try to put point on a group before point.
 973         (unless after
 974           (setq after (cdr (member group (reverse (cdr list)))))
 975           (while (and after
 976                       (not (gnus-group-goto-group (car after))))
 977             (setq after (cdr after))))
 978         ;; Finally, just put point on the topic.
 979         (if (not (car list))
 980             (goto-char (point-min))
 981           (unless after
 982             (gnus-topic-goto-topic (car list))
 983             (setq after nil)))
 984         t))))
 985
 986 ;;; Topic-active functions
 987
 988 (defun gnus-topic-grok-active (&optional force)
 989   "Parse all active groups and create topic structures for them."
 990   ;; First we make sure that we have really read the active file.
 991   (when (or force
 992             (not gnus-topic-active-alist))
 993     (let (groups)
 994       ;; Get a list of all groups available.
 995       (mapatoms (lambda (g) (when (symbol-value g)
 996                               (push (symbol-name g) groups)))
 997                 gnus-active-hashtb)
 998       (setq groups (sort groups 'string<))
 999       ;; Init the variables.
1000       (setq gnus-topic-active-topology (list (list "" 'visible)))
1001       (setq gnus-topic-active-alist nil)
1002       ;; Descend the top-level hierarchy.
1003       (gnus-topic-grok-active-1 gnus-topic-active-topology groups)
1004       ;; Set the top-level topic names to something nice.
1005       (setcar (car gnus-topic-active-topology) "Gnus active")
1006       (setcar (car gnus-topic-active-alist) "Gnus active"))))
1007
1008 (defun gnus-topic-grok-active-1 (topology groups)
1009   (let* ((name (caar topology))
1010          (prefix (concat "^" (regexp-quote name)))
1011          tgroups ntopology group)
1012     (while (and groups
1013                 (string-match prefix (setq group (car groups))))
1014       (if (not (string-match "\\." group (match-end 0)))
1015           ;; There are no further hierarchies here, so we just
1016           ;; enter this group into the list belonging to this
1017           ;; topic.
1018           (push (pop groups) tgroups)
1019         ;; New sub-hierarchy, so we add it to the topology.
1020         (nconc topology (list (setq ntopology
1021                                     (list (list (substring
1022                                                  group 0 (match-end 0))
1023                                                 'invisible)))))
1024         ;; Descend the hierarchy.
1025         (setq groups (gnus-topic-grok-active-1 ntopology groups))))
1026     ;; We remove the trailing "." from the topic name.
1027     (setq name
1028           (if (string-match "\\.$" name)
1029               (substring name 0 (match-beginning 0))
1030             name))
1031     ;; Add this topic and its groups to the topic alist.
1032     (push (cons name (nreverse tgroups)) gnus-topic-active-alist)
1033     (setcar (car topology) name)
1034     ;; We return the rest of the groups that didn't belong
1035     ;; to this topic.
1036     groups))
1037
1038 ;;; Topic mode, commands and keymap.
1039
1040 (defvar gnus-topic-mode-map nil)
1041 (defvar gnus-group-topic-map nil)
1042
1043 (unless gnus-topic-mode-map
1044   (setq gnus-topic-mode-map (make-sparse-keymap))
1045
1046   ;; Override certain group mode keys.
1047   (gnus-define-keys gnus-topic-mode-map
1048     "=" gnus-topic-select-group
1049     "\r" gnus-topic-select-group
1050     " " gnus-topic-read-group
1051     "\C-c\C-x" gnus-topic-expire-articles
1052     "c" gnus-topic-catchup-articles
1053     "\C-k" gnus-topic-kill-group
1054     "\C-y" gnus-topic-yank-group
1055     "\M-g" gnus-topic-get-new-news-this-topic
1056     "AT" gnus-topic-list-active
1057     "Gp" gnus-topic-edit-parameters
1058     "#" gnus-topic-mark-topic
1059     "\M-#" gnus-topic-unmark-topic
1060     [tab] gnus-topic-indent
1061     [(meta tab)] gnus-topic-unindent
1062     "\C-i" gnus-topic-indent
1063     "\M-\C-i" gnus-topic-unindent
1064     gnus-mouse-2 gnus-mouse-pick-topic)
1065
1066   ;; Define a new submap.
1067   (gnus-define-keys (gnus-group-topic-map "T" gnus-group-mode-map)
1068     "#" gnus-topic-mark-topic
1069     "\M-#" gnus-topic-unmark-topic
1070     "n" gnus-topic-create-topic
1071     "m" gnus-topic-move-group
1072     "D" gnus-topic-remove-group
1073     "c" gnus-topic-copy-group
1074     "h" gnus-topic-hide-topic
1075     "s" gnus-topic-show-topic
1076     "j" gnus-topic-jump-to-topic
1077     "M" gnus-topic-move-matching
1078     "C" gnus-topic-copy-matching
1079     "\M-p" gnus-topic-goto-previous-topic
1080     "\M-n" gnus-topic-goto-next-topic
1081     "\C-i" gnus-topic-indent
1082     [tab] gnus-topic-indent
1083     "r" gnus-topic-rename
1084     "\177" gnus-topic-delete
1085     [delete] gnus-topic-delete
1086     "H" gnus-topic-toggle-display-empty-topics)
1087
1088   (gnus-define-keys (gnus-topic-sort-map "S" gnus-group-topic-map)
1089     "s" gnus-topic-sort-groups
1090     "a" gnus-topic-sort-groups-by-alphabet
1091     "u" gnus-topic-sort-groups-by-unread
1092     "l" gnus-topic-sort-groups-by-level
1093     "e" gnus-topic-sort-groups-by-server
1094     "v" gnus-topic-sort-groups-by-score
1095     "r" gnus-topic-sort-groups-by-rank
1096     "m" gnus-topic-sort-groups-by-method))
1097
1098 (defun gnus-topic-make-menu-bar ()
1099   (unless (boundp 'gnus-topic-menu)
1100     (easy-menu-define
1101      gnus-topic-menu gnus-topic-mode-map ""
1102      '("Topics"
1103        ["Toggle topics" gnus-topic-mode t]
1104        ("Groups"
1105         ["Copy..." gnus-topic-copy-group t]
1106         ["Move..." gnus-topic-move-group t]
1107         ["Remove" gnus-topic-remove-group t]
1108         ["Copy matching..." gnus-topic-copy-matching t]
1109         ["Move matching..." gnus-topic-move-matching t])
1110        ("Topics"
1111         ["Goto..." gnus-topic-jump-to-topic t]
1112         ["Show" gnus-topic-show-topic t]
1113         ["Hide" gnus-topic-hide-topic t]
1114         ["Delete" gnus-topic-delete t]
1115         ["Rename..." gnus-topic-rename t]
1116         ["Create..." gnus-topic-create-topic t]
1117         ["Mark" gnus-topic-mark-topic t]
1118         ["Indent" gnus-topic-indent t]
1119         ["Sort" gnus-topic-sort-topics t]
1120         ["Previous topic" gnus-topic-goto-previous-topic t]
1121         ["Next topic" gnus-topic-goto-next-topic t]
1122         ["Toggle hide empty" gnus-topic-toggle-display-empty-topics t]
1123         ["Edit parameters" gnus-topic-edit-parameters t])
1124        ["List active" gnus-topic-list-active t]))))
1125
1126 (defun gnus-topic-mode (&optional arg redisplay)
1127   "Minor mode for topicsifying Gnus group buffers."
1128   (interactive (list current-prefix-arg t))
1129   (when (eq major-mode 'gnus-group-mode)
1130     (make-local-variable 'gnus-topic-mode)
1131     (setq gnus-topic-mode
1132           (if (null arg) (not gnus-topic-mode)
1133             (> (prefix-numeric-value arg) 0)))
1134     ;; Infest Gnus with topics.
1135     (if (not gnus-topic-mode)
1136         (setq gnus-goto-missing-group-function nil)
1137       (when (gnus-visual-p 'topic-menu 'menu)
1138         (gnus-topic-make-menu-bar))
1139       (gnus-set-format 'topic t)
1140       (gnus-add-minor-mode 'gnus-topic-mode " Topic" gnus-topic-mode-map)
1141       (add-hook 'gnus-group-catchup-group-hook 'gnus-topic-update-topic)
1142       (set (make-local-variable 'gnus-group-prepare-function)
1143            'gnus-group-prepare-topics)
1144       (set (make-local-variable 'gnus-group-get-parameter-function)
1145            'gnus-group-topic-parameters)
1146       (set (make-local-variable 'gnus-group-goto-next-group-function)
1147            'gnus-topic-goto-next-group)
1148       (set (make-local-variable 'gnus-group-indentation-function)
1149            'gnus-topic-group-indentation)
1150       (set (make-local-variable 'gnus-group-update-group-function)
1151            'gnus-topic-update-topics-containing-group)
1152       (set (make-local-variable 'gnus-group-sort-alist-function)
1153            'gnus-group-sort-topic)
1154       (setq gnus-group-change-level-function 'gnus-topic-change-level)
1155       (setq gnus-goto-missing-group-function 'gnus-topic-goto-missing-group)
1156       (gnus-make-local-hook 'gnus-check-bogus-groups-hook)
1157       (add-hook 'gnus-check-bogus-groups-hook 'gnus-topic-clean-alist
1158                 nil 'local)
1159       (setq gnus-topology-checked-p nil)
1160       ;; We check the topology.
1161       (when gnus-newsrc-alist
1162         (gnus-topic-check-topology))
1163       (gnus-run-hooks 'gnus-topic-mode-hook))
1164     ;; Remove topic infestation.
1165     (unless gnus-topic-mode
1166       (remove-hook 'gnus-summary-exit-hook 'gnus-topic-update-topic)
1167       (setq gnus-group-change-level-function nil)
1168       (remove-hook 'gnus-check-bogus-groups-hook 'gnus-topic-clean-alist)
1169       (setq gnus-group-prepare-function 'gnus-group-prepare-flat)
1170       (setq gnus-group-sort-alist-function 'gnus-group-sort-flat))
1171     (when redisplay
1172       (gnus-group-list-groups))))
1173
1174 (defun gnus-topic-select-group (&optional all)
1175   "Select this newsgroup.
1176 No article is selected automatically.
1177 If the group is opened, just switch the summary buffer.
1178 If ALL is non-nil, already read articles become readable.
1179 If ALL is a number, fetch this number of articles.
1180
1181 If performed over a topic line, toggle folding the topic."
1182   (interactive "P")
1183   (when (and (eobp) (not (gnus-group-group-name)))
1184     (forward-line -1))
1185   (if (gnus-group-topic-p)
1186       (let ((gnus-group-list-mode
1187              (if all (cons (if (numberp all) all 7) t) gnus-group-list-mode)))
1188         (gnus-topic-fold all)
1189         (gnus-dribble-touch))
1190     (gnus-group-select-group all)))
1191
1192 (defun gnus-mouse-pick-topic (e)
1193   "Select the group or topic under the mouse pointer."
1194   (interactive "e")
1195   (mouse-set-point e)
1196   (gnus-topic-read-group nil))
1197
1198 (defun gnus-topic-expire-articles (topic)
1199   "Expire articles in this topic or group."
1200   (interactive (list (gnus-group-topic-name)))
1201   (if (not topic)
1202       (call-interactively 'gnus-group-expire-articles)
1203     (save-excursion
1204       (gnus-message 5 "Expiring groups in %s..." topic)
1205       (let ((gnus-group-marked
1206              (mapcar (lambda (entry) (car (nth 2 entry)))
1207                      (gnus-topic-find-groups topic gnus-level-killed t
1208                                              nil t))))
1209         (gnus-group-expire-articles nil))
1210       (gnus-message 5 "Expiring groups in %s...done" topic))))
1211
1212 (defun gnus-topic-catchup-articles (topic)
1213   "Catchup this topic or group.
1214 Also see `gnus-group-catchup'."
1215   (interactive (list (gnus-group-topic-name)))
1216   (if (not topic)
1217       (call-interactively 'gnus-group-catchup-current)
1218     (save-excursion
1219       (let* ((groups
1220              (mapcar (lambda (entry) (car (nth 2 entry)))
1221                      (gnus-topic-find-groups topic gnus-level-killed t
1222                                              nil t)))
1223              (buffer-read-only nil)
1224              (gnus-group-marked groups))
1225         (gnus-group-catchup-current)
1226         (mapcar 'gnus-topic-update-topics-containing-group groups)))))
1227
1228 (defun gnus-topic-read-group (&optional all no-article group)
1229   "Read news in this newsgroup.
1230 If the prefix argument ALL is non-nil, already read articles become
1231 readable.  IF ALL is a number, fetch this number of articles.  If the
1232 optional argument NO-ARTICLE is non-nil, no article will be
1233 auto-selected upon group entry.  If GROUP is non-nil, fetch that
1234 group.
1235
1236 If performed over a topic line, toggle folding the topic."
1237   (interactive "P")
1238   (if (gnus-group-topic-p)
1239       (let ((gnus-group-list-mode
1240              (if all (cons (if (numberp all) all 7) t) gnus-group-list-mode)))
1241         (gnus-topic-fold all))
1242     (gnus-group-read-group all no-article group)))
1243
1244 (defun gnus-topic-create-topic (topic parent &optional previous full-topic)
1245   "Create a new TOPIC under PARENT.
1246 When used interactively, PARENT will be the topic under point."
1247   (interactive
1248    (list
1249     (read-string "New topic: ")
1250     (gnus-current-topic)))
1251   ;; Check whether this topic already exists.
1252   (when (gnus-topic-find-topology topic)
1253     (error "Topic already exists"))
1254   (unless parent
1255     (setq parent (caar gnus-topic-topology)))
1256   (let ((top (cdr (gnus-topic-find-topology parent)))
1257         (full-topic (or full-topic (list (list topic 'visible nil nil)))))
1258     (unless top
1259       (error "No such parent topic: %s" parent))
1260     (if previous
1261         (progn
1262           (while (and (cdr top)
1263                       (not (equal (caaadr top) previous)))
1264             (setq top (cdr top)))
1265           (setcdr top (cons full-topic (cdr top))))
1266       (nconc top (list full-topic)))
1267     (unless (assoc topic gnus-topic-alist)
1268       (push (list topic) gnus-topic-alist)))
1269   (gnus-topic-enter-dribble)
1270   (gnus-group-list-groups)
1271   (gnus-topic-goto-topic topic))
1272
1273 ;; FIXME:
1274 ;;  1. When the marked groups are overlapped with the process
1275 ;;     region, the behavior of move or remove is not right.
1276 ;;  2. Can't process on several marked groups with a same name,
1277 ;;     because gnus-group-marked only keeps one copy.
1278
1279 (defun gnus-topic-move-group (n topic &optional copyp)
1280   "Move the next N groups to TOPIC.
1281 If COPYP, copy the groups instead."
1282   (interactive
1283    (list current-prefix-arg
1284          (gnus-completing-read "Move to topic" gnus-topic-alist nil t
1285                                'gnus-topic-history)))
1286   (let ((use-marked (and (not n) (not (gnus-region-active-p))
1287                          gnus-group-marked t))
1288         (groups (gnus-group-process-prefix n))
1289         (topicl (assoc topic gnus-topic-alist))
1290         (start-topic (gnus-group-topic-name))
1291         (start-group (progn (forward-line 1) (gnus-group-group-name)))
1292         entry)
1293     (if (and (not groups) (not copyp) start-topic)
1294         (gnus-topic-move start-topic topic)
1295       (mapcar
1296        (lambda (g)
1297          (gnus-group-remove-mark g use-marked)
1298          (when (and
1299                 (setq entry (assoc (gnus-current-topic) gnus-topic-alist))
1300                 (not copyp))
1301            (setcdr entry (gnus-delete-first g (cdr entry))))
1302          (nconc topicl (list g)))
1303        groups)
1304       (gnus-topic-enter-dribble)
1305       (if start-group
1306           (gnus-group-goto-group start-group)
1307         (gnus-topic-goto-topic start-topic))
1308       (gnus-group-list-groups))))
1309
1310 (defun gnus-topic-remove-group (&optional n)
1311   "Remove the current group from the topic."
1312   (interactive "P")
1313   (let ((use-marked (and (not n) (not (gnus-region-active-p))
1314                          gnus-group-marked t))
1315         (groups (gnus-group-process-prefix n)))
1316     (mapcar
1317      (lambda (group)
1318        (gnus-group-remove-mark group use-marked)
1319        (let ((topicl (assoc (gnus-current-topic) gnus-topic-alist))
1320              (buffer-read-only nil))
1321          (when (and topicl group)
1322            (gnus-delete-line)
1323            (gnus-delete-first group topicl))
1324          (gnus-topic-update-topic)))
1325      groups)
1326     (gnus-topic-enter-dribble)
1327     (gnus-group-position-point)))
1328
1329 (defun gnus-topic-copy-group (n topic)
1330   "Copy the current group to a topic."
1331   (interactive
1332    (list current-prefix-arg
1333          (completing-read "Copy to topic: " gnus-topic-alist nil t)))
1334   (gnus-topic-move-group n topic t))
1335
1336 (defun gnus-topic-kill-group (&optional n discard)
1337   "Kill the next N groups."
1338   (interactive "P")
1339   (if (gnus-group-topic-p)
1340       (let ((topic (gnus-group-topic-name)))
1341         (push (cons
1342                (gnus-topic-find-topology topic)
1343                (assoc topic gnus-topic-alist))
1344               gnus-topic-killed-topics)
1345         (gnus-topic-remove-topic nil t)
1346         (gnus-topic-find-topology topic nil nil gnus-topic-topology)
1347         (gnus-topic-enter-dribble))
1348     (gnus-group-kill-group n discard)
1349     (if (not (gnus-group-topic-p))
1350         (gnus-topic-update-topic)
1351       ;; Move up one line so that we update the right topic.
1352       (forward-line -1)
1353       (gnus-topic-update-topic)
1354       (forward-line 1))))
1355
1356 (defun gnus-topic-yank-group (&optional arg)
1357   "Yank the last topic."
1358   (interactive "p")
1359   (if gnus-topic-killed-topics
1360       (let* ((previous
1361               (or (gnus-group-topic-name)
1362                   (gnus-topic-next-topic (gnus-current-topic))))
1363              (data (pop gnus-topic-killed-topics))
1364              (alist (cdr data))
1365              (item (cdar data)))
1366         (push alist gnus-topic-alist)
1367         (gnus-topic-create-topic
1368          (caar item) (gnus-topic-parent-topic previous) previous
1369          item)
1370         (gnus-topic-enter-dribble)
1371         (gnus-topic-goto-topic (caar item)))
1372     (let* ((prev (gnus-group-group-name))
1373            (gnus-topic-inhibit-change-level t)
1374            (gnus-group-indentation
1375             (make-string
1376              (* gnus-topic-indent-level
1377                 (or (save-excursion
1378                       (gnus-topic-goto-topic (gnus-current-topic))
1379                       (gnus-group-topic-level))
1380                     0))
1381              ? ))
1382            yanked alist)
1383       ;; We first yank the groups the normal way...
1384       (setq yanked (gnus-group-yank-group arg))
1385       ;; Then we enter the yanked groups into the topics they belong
1386       ;; to.
1387       (setq alist (assoc (save-excursion
1388                            (forward-line -1)
1389                            (gnus-current-topic))
1390                          gnus-topic-alist))
1391       (when (stringp yanked)
1392         (setq yanked (list yanked)))
1393       (if (not prev)
1394           (nconc alist yanked)
1395         (if (not (cdr alist))
1396             (setcdr alist (nconc yanked (cdr alist)))
1397           (while (cdr alist)
1398             (when (equal (cadr alist) prev)
1399               (setcdr alist (nconc yanked (cdr alist)))
1400               (setq alist nil))
1401             (setq alist (cdr alist))))))
1402     (gnus-topic-update-topic)))
1403
1404 (defun gnus-topic-hide-topic (&optional permanent)
1405   "Hide the current topic.
1406 If PERMANENT, make it stay hidden in subsequent sessions as well."
1407   (interactive "P")
1408   (when (gnus-current-topic)
1409     (gnus-topic-goto-topic (gnus-current-topic))
1410     (if permanent
1411         (setcar (cddr
1412                  (cadr
1413                   (gnus-topic-find-topology (gnus-current-topic))))
1414                 'hidden))
1415     (gnus-topic-remove-topic nil nil)))
1416
1417 (defun gnus-topic-show-topic (&optional permanent)
1418   "Show the hidden topic.
1419 If PERMANENT, make it stay shown in subsequent sessions as well."
1420   (interactive "P")
1421   (when (gnus-group-topic-p)
1422     (if (not permanent)
1423         (gnus-topic-remove-topic t nil)
1424       (let ((topic
1425              (gnus-topic-find-topology
1426               (completing-read "Show topic: " gnus-topic-alist nil t))))
1427         (setcar (cddr (cadr topic)) nil)
1428         (setcar (cdr (cadr topic)) 'visible)
1429         (gnus-group-list-groups)))))
1430
1431 (defun gnus-topic-mark-topic (topic &optional unmark non-recursive)
1432   "Mark all groups in the TOPIC with the process mark.
1433 If NON-RECURSIVE (which is the prefix) is t, don't mark its subtopics."
1434   (interactive (list (gnus-group-topic-name)
1435                      nil
1436                      (and current-prefix-arg t)))
1437   (if (not topic)
1438       (call-interactively 'gnus-group-mark-group)
1439     (save-excursion
1440       (let ((groups (gnus-topic-find-groups topic gnus-level-killed t nil
1441                                             (not non-recursive))))
1442         (while groups
1443           (funcall (if unmark 'gnus-group-remove-mark 'gnus-group-set-mark)
1444                    (gnus-info-group (nth 2 (pop groups)))))))))
1445
1446 (defun gnus-topic-unmark-topic (topic &optional dummy non-recursive)
1447   "Remove the process mark from all groups in the TOPIC.
1448 If NON-RECURSIVE (which is the prefix) is t, don't unmark its subtopics."
1449   (interactive (list (gnus-group-topic-name)
1450                      nil
1451                      (and current-prefix-arg t)))
1452   (if (not topic)
1453       (call-interactively 'gnus-group-unmark-group)
1454     (gnus-topic-mark-topic topic t non-recursive)))
1455
1456 (defun gnus-topic-get-new-news-this-topic (&optional n)
1457   "Check for new news in the current topic."
1458   (interactive "P")
1459   (if (not (gnus-group-topic-p))
1460       (gnus-group-get-new-news-this-group n)
1461     (let* ((topic (gnus-group-topic-name))
1462            (data (cadr (gnus-topic-find-topology topic))))
1463       (save-excursion
1464         (gnus-topic-mark-topic topic nil (and n t))
1465         (gnus-group-get-new-news-this-group))
1466       (gnus-topic-remove-topic (eq 'visible (cadr data))))))
1467
1468 (defun gnus-topic-move-matching (regexp topic &optional copyp)
1469   "Move all groups that match REGEXP to some topic."
1470   (interactive
1471    (let (topic)
1472      (nreverse
1473       (list
1474        (setq topic (completing-read "Move to topic: " gnus-topic-alist nil t))
1475        (read-string (format "Move to %s (regexp): " topic))))))
1476   (gnus-group-mark-regexp regexp)
1477   (gnus-topic-move-group nil topic copyp))
1478
1479 (defun gnus-topic-copy-matching (regexp topic &optional copyp)
1480   "Copy all groups that match REGEXP to some topic."
1481   (interactive
1482    (let (topic)
1483      (nreverse
1484       (list
1485        (setq topic (completing-read "Copy to topic: " gnus-topic-alist nil t))
1486        (read-string (format "Copy to %s (regexp): " topic))))))
1487   (gnus-topic-move-matching regexp topic t))
1488
1489 (defun gnus-topic-delete (topic)
1490   "Delete a topic."
1491   (interactive (list (gnus-group-topic-name)))
1492   (unless topic
1493     (error "No topic to be deleted"))
1494   (let ((entry (assoc topic gnus-topic-alist))
1495         (buffer-read-only nil))
1496     (when (cdr entry)
1497       (error "Topic not empty"))
1498     ;; Delete if visible.
1499     (when (gnus-topic-goto-topic topic)
1500       (gnus-delete-line))
1501     ;; Remove from alist.
1502     (setq gnus-topic-alist (delq entry gnus-topic-alist))
1503     ;; Remove from topology.
1504     (gnus-topic-find-topology topic nil nil 'delete)
1505     (gnus-dribble-touch)))
1506
1507 (defun gnus-topic-rename (old-name new-name)
1508   "Rename a topic."
1509   (interactive
1510    (let ((topic (gnus-current-topic)))
1511      (list topic
1512            (read-string (format "Rename %s to: " topic) topic))))
1513   ;; Check whether the new name exists.
1514   (when (gnus-topic-find-topology new-name)
1515     (error "Topic '%s' already exists" new-name))
1516   ;; "nil" is an invalid name, for reasons I'd rather not go
1517   ;; into here.  Trust me.
1518   (when (equal new-name "nil")
1519     (error "Invalid name: %s" nil))
1520   ;; Do the renaming.
1521   (let ((top (gnus-topic-find-topology old-name))
1522         (entry (assoc old-name gnus-topic-alist)))
1523     (when top
1524       (setcar (cadr top) new-name))
1525     (when entry
1526       (setcar entry new-name))
1527     (forward-line -1)
1528     (gnus-dribble-touch)
1529     (gnus-group-list-groups)
1530     (forward-line 1)))
1531
1532 (defun gnus-topic-indent (&optional unindent)
1533   "Indent a topic -- make it a sub-topic of the previous topic.
1534 If UNINDENT, remove an indentation."
1535   (interactive "P")
1536   (if unindent
1537       (gnus-topic-unindent)
1538     (let* ((topic (gnus-current-topic))
1539            (parent (gnus-topic-previous-topic topic))
1540            (buffer-read-only nil))
1541       (unless parent
1542         (error "Nothing to indent %s into" topic))
1543       (when topic
1544         (gnus-topic-goto-topic topic)
1545         (gnus-topic-kill-group)
1546         (push (cdar gnus-topic-killed-topics) gnus-topic-alist)
1547         (gnus-topic-create-topic
1548          topic parent nil (cdar (car gnus-topic-killed-topics)))
1549         (pop gnus-topic-killed-topics)
1550         (or (gnus-topic-goto-topic topic)
1551             (gnus-topic-goto-topic parent))))))
1552
1553 (defun gnus-topic-unindent ()
1554   "Unindent a topic."
1555   (interactive)
1556   (let* ((topic (gnus-current-topic))
1557          (parent (gnus-topic-parent-topic topic))
1558          (grandparent (gnus-topic-parent-topic parent)))
1559     (unless grandparent
1560       (error "Nothing to indent %s into" topic))
1561     (when topic
1562       (gnus-topic-goto-topic topic)
1563       (gnus-topic-kill-group)
1564       (push (cdar gnus-topic-killed-topics) gnus-topic-alist)
1565       (gnus-topic-create-topic
1566        topic grandparent (gnus-topic-next-topic parent)
1567        (cdar (car gnus-topic-killed-topics)))
1568       (pop gnus-topic-killed-topics)
1569       (gnus-topic-goto-topic topic))))
1570
1571 (defun gnus-topic-list-active (&optional force)
1572   "List all groups that Gnus knows about in a topicsified fashion.
1573 If FORCE, always re-read the active file."
1574   (interactive "P")
1575   (when force
1576     (gnus-get-killed-groups))
1577   (gnus-topic-grok-active force)
1578   (let ((gnus-topic-topology gnus-topic-active-topology)
1579         (gnus-topic-alist gnus-topic-active-alist)
1580         gnus-killed-list gnus-zombie-list)
1581     (gnus-group-list-groups gnus-level-killed nil 1)))
1582
1583 (defun gnus-topic-toggle-display-empty-topics ()
1584   "Show/hide topics that have no unread articles."
1585   (interactive)
1586   (setq gnus-topic-display-empty-topics
1587         (not gnus-topic-display-empty-topics))
1588   (gnus-group-list-groups)
1589   (message "%s empty topics"
1590            (if gnus-topic-display-empty-topics
1591                "Showing" "Hiding")))
1592
1593 ;;; Topic sorting functions
1594
1595 (defun gnus-topic-edit-parameters (group)
1596   "Edit the group parameters of GROUP.
1597 If performed on a topic, edit the topic parameters instead."
1598   (interactive (list (gnus-group-group-name)))
1599   (if group
1600       (gnus-group-edit-group-parameters group)
1601     (if (not (gnus-group-topic-p))
1602         (error "Nothing to edit on the current line")
1603       (let ((topic (gnus-group-topic-name)))
1604         (gnus-edit-form
1605          (gnus-topic-parameters topic)
1606          (format "Editing the topic parameters for `%s'."
1607                  (or group topic))
1608          `(lambda (form)
1609             (gnus-topic-set-parameters ,topic form)))))))
1610
1611 (defun gnus-group-sort-topic (func reverse)
1612   "Sort groups in the topics according to FUNC and REVERSE."
1613   (let ((alist gnus-topic-alist))
1614     (while alist
1615       ;; !!!Sometimes nil elements sneak into the alist,
1616       ;; for some reason or other.
1617       (setcar alist (delq nil (car alist)))
1618       (setcar alist (delete "dummy.group" (car alist)))
1619       (gnus-topic-sort-topic (pop alist) func reverse))))
1620
1621 (defun gnus-topic-sort-topic (topic func reverse)
1622   ;; Each topic only lists the name of the group, while
1623   ;; the sort predicates expect group infos as inputs.
1624   ;; So we first transform the group names into infos,
1625   ;; then sort, and then transform back into group names.
1626   (setcdr
1627    topic
1628    (mapcar
1629     (lambda (info) (gnus-info-group info))
1630     (sort
1631      (mapcar
1632       (lambda (group) (gnus-get-info group))
1633       (cdr topic))
1634      func)))
1635   ;; Do the reversal, if necessary.
1636   (when reverse
1637     (setcdr topic (nreverse (cdr topic)))))
1638
1639 (defun gnus-topic-sort-groups (func &optional reverse)
1640   "Sort the current topic according to FUNC.
1641 If REVERSE, reverse the sorting order."
1642   (interactive (list gnus-group-sort-function current-prefix-arg))
1643   (let ((topic (assoc (gnus-current-topic) gnus-topic-alist)))
1644     (gnus-topic-sort-topic
1645      topic (gnus-make-sort-function func) reverse)
1646     (gnus-group-list-groups)))
1647
1648 (defun gnus-topic-sort-groups-by-alphabet (&optional reverse)
1649   "Sort the current topic alphabetically by group name.
1650 If REVERSE, sort in reverse order."
1651   (interactive "P")
1652   (gnus-topic-sort-groups 'gnus-group-sort-by-alphabet reverse))
1653
1654 (defun gnus-topic-sort-groups-by-unread (&optional reverse)
1655   "Sort the current topic by number of unread articles.
1656 If REVERSE, sort in reverse order."
1657   (interactive "P")
1658   (gnus-topic-sort-groups 'gnus-group-sort-by-unread reverse))
1659
1660 (defun gnus-topic-sort-groups-by-level (&optional reverse)
1661   "Sort the current topic by group level.
1662 If REVERSE, sort in reverse order."
1663   (interactive "P")
1664   (gnus-topic-sort-groups 'gnus-group-sort-by-level reverse))
1665
1666 (defun gnus-topic-sort-groups-by-score (&optional reverse)
1667   "Sort the current topic by group score.
1668 If REVERSE, sort in reverse order."
1669   (interactive "P")
1670   (gnus-topic-sort-groups 'gnus-group-sort-by-score reverse))
1671
1672 (defun gnus-topic-sort-groups-by-rank (&optional reverse)
1673   "Sort the current topic by group rank.
1674 If REVERSE, sort in reverse order."
1675   (interactive "P")
1676   (gnus-topic-sort-groups 'gnus-group-sort-by-rank reverse))
1677
1678 (defun gnus-topic-sort-groups-by-method (&optional reverse)
1679   "Sort the current topic alphabetically by backend name.
1680 If REVERSE, sort in reverse order."
1681   (interactive "P")
1682   (gnus-topic-sort-groups 'gnus-group-sort-by-method reverse))
1683
1684 (defun gnus-topic-sort-groups-by-server (&optional reverse)
1685   "Sort the current topic alphabetically by server name.
1686 If REVERSE, sort in reverse order."
1687   (interactive "P")
1688   (gnus-topic-sort-groups 'gnus-group-sort-by-server reverse))
1689
1690 (defun gnus-topic-sort-topics-1 (top reverse)
1691   (if (cdr top)
1692       (let ((subtop
1693              (mapcar (gnus-byte-compile
1694                       `(lambda (top)
1695                          (gnus-topic-sort-topics-1 top ,reverse)))
1696                      (sort (cdr top)
1697                            (lambda (t1 t2)
1698                              (string-lessp (caar t1) (caar t2)))))))
1699         (setcdr top (if reverse (reverse subtop) subtop))))
1700   top)
1701
1702 (defun gnus-topic-sort-topics (&optional topic reverse)
1703   "Sort topics in TOPIC alphabetically by topic name.
1704 If REVERSE, reverse the sorting order."
1705   (interactive
1706    (list (completing-read "Sort topics in : " gnus-topic-alist nil t
1707                           (gnus-current-topic))
1708          current-prefix-arg))
1709   (let ((topic-topology (or (and topic (cdr (gnus-topic-find-topology topic)))
1710                             gnus-topic-topology)))
1711     (gnus-topic-sort-topics-1 topic-topology reverse)
1712     (gnus-topic-enter-dribble)
1713     (gnus-group-list-groups)
1714     (gnus-topic-goto-topic topic)))
1715
1716 (defun gnus-topic-move (current to)
1717   "Move the CURRENT topic to TO."
1718   (interactive
1719    (list
1720     (gnus-group-topic-name)
1721     (completing-read "Move to topic: " gnus-topic-alist nil t)))
1722   (unless (and current to)
1723     (error "Can't find topic"))
1724   (let ((current-top (cdr (gnus-topic-find-topology current)))
1725         (to-top (cdr (gnus-topic-find-topology to))))
1726     (unless current-top
1727       (error "Can't find topic `%s'" current))
1728     (unless to-top
1729       (error "Can't find topic `%s'" to))
1730     (if (gnus-topic-find-topology to current-top 0);; Don't care the level
1731         (error "Can't move `%s' to its sub-level" current))
1732     (gnus-topic-find-topology current nil nil 'delete)
1733     (while (cdr to-top)
1734       (setq to-top (cdr to-top)))
1735     (setcdr to-top (list current-top))
1736     (gnus-topic-enter-dribble)
1737     (gnus-group-list-groups)
1738     (gnus-topic-goto-topic current)))
1739
1740 (defun gnus-subscribe-topics (newsgroup)
1741   (catch 'end
1742     (let (match gnus-group-change-level-function)
1743       (dolist (topic (gnus-topic-list))
1744         (when (and (setq match (cdr (assq 'subscribe
1745                                           (gnus-topic-parameters topic))))
1746                    (string-match match newsgroup))
1747           ;; Just subscribe the group.
1748           (gnus-subscribe-alphabetically newsgroup)
1749           ;; Add the group to the topic.
1750           (nconc (assoc topic gnus-topic-alist) (list newsgroup))
1751           ;; if this topic specifies a default level, use it
1752           (let ((subscribe-level (cdr (assq 'subscribe-level
1753                                             (gnus-topic-parameters topic)))))
1754             (when subscribe-level
1755                 (gnus-group-change-level newsgroup subscribe-level
1756                                          gnus-level-default-subscribed)))
1757           (throw 'end t)))
1758       nil)))
1759
1760 (provide 'gnus-topic)
1761
1762 ;;; arch-tag: bf176856-f30c-40f0-ae77-e41529a1134c
1763 ;;; gnus-topic.el ends here