lisp/gnus/gnus-int.el

   1 ;;; gnus-int.el --- backend interface functions for Gnus
   2
   3 ;; Copyright (C) 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004
   4 ;;   2005, 2006, 2007, 2008 Free Software Foundation, Inc.
   5
   6 ;; Author: Lars Magne Ingebrigtsen <larsi@gnus.org>
   7 ;; Keywords: news
   8
   9 ;; This file is part of GNU Emacs.
  10
  11 ;; GNU Emacs is free software; you can redistribute it and/or modify
  12 ;; it under the terms of the GNU General Public License as published by
  13 ;; the Free Software Foundation; either version 3, or (at your option)
  14 ;; any later version.
  15
  16 ;; GNU Emacs is distributed in the hope that it will be useful,
  17 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  18 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19 ;; GNU General Public License for more details.
  20
  21 ;; You should have received a copy of the GNU General Public License
  22 ;; along with GNU Emacs; see the file COPYING.  If not, write to the
  23 ;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  24 ;; Boston, MA 02110-1301, USA.
  25
  26 ;;; Commentary:
  27
  28 ;;; Code:
  29
  30 (eval-when-compile (require 'cl))
  31
  32 (require 'gnus)
  33 (require 'message)
  34 (require 'gnus-range)
  35
  36 (autoload 'gnus-agent-expire "gnus-agent")
  37 (autoload 'gnus-agent-regenerate-group "gnus-agent")
  38 (autoload 'gnus-agent-read-servers-validate-native "gnus-agent")
  39 (autoload 'gnus-agent-possibly-synchronize-flags-server "gnus-agent")
  40
  41 (defcustom gnus-open-server-hook nil
  42   "Hook called just before opening connection to the news server."
  43   :group 'gnus-start
  44   :type 'hook)
  45
  46 (defcustom gnus-server-unopen-status nil
  47   "The default status if the server is not able to open.
  48 If the server is covered by Gnus agent, the possible values are
  49 `denied', set the server denied; `offline', set the server offline;
  50 nil, ask user.  If the server is not covered by Gnus agent, set the
  51 server denied."
  52   :version "22.1"
  53   :group 'gnus-start
  54   :type '(choice (const :tag "Ask" nil)
  55                  (const :tag "Deny server" denied)
  56                  (const :tag "Unplug Agent" offline)))
  57
  58 (defvar gnus-internal-registry-spool-current-method nil
  59   "The current method, for the registry.")
  60
  61
  62 (defun gnus-server-opened (gnus-command-method)
  63   "Check whether a connection to GNUS-COMMAND-METHOD has been opened."
  64   (unless (eq (gnus-server-status gnus-command-method)
  65               'denied)
  66     (when (stringp gnus-command-method)
  67       (setq gnus-command-method (gnus-server-to-method gnus-command-method)))
  68     (funcall (inline (gnus-get-function gnus-command-method 'server-opened))
  69              (nth 1 gnus-command-method))))
  70
  71 (defun gnus-status-message (gnus-command-method)
  72   "Return the status message from GNUS-COMMAND-METHOD.
  73 If GNUS-COMMAND-METHOD is a string, it is interpreted as a group
  74 name.  The method this group uses will be queried."
  75   (let ((gnus-command-method
  76          (if (stringp gnus-command-method)
  77              (gnus-find-method-for-group gnus-command-method)
  78            gnus-command-method)))
  79     (funcall (gnus-get-function gnus-command-method 'status-message)
  80              (nth 1 gnus-command-method))))
  81
  82 ;;;
  83 ;;; Server Communication
  84 ;;;
  85
  86 (defun gnus-start-news-server (&optional confirm)
  87   "Open a method for getting news.
  88 If CONFIRM is non-nil, the user will be asked for an NNTP server."
  89   (let (how)
  90     (if gnus-current-select-method
  91         ;; Stream is already opened.
  92         nil
  93       ;; Open NNTP server.
  94       (unless gnus-nntp-service
  95         (setq gnus-nntp-server nil))
  96       (when confirm
  97         ;; Read server name with completion.
  98         (setq gnus-nntp-server
  99               (completing-read "NNTP server: "
 100                                (mapcar 'list
 101                                        (cons (list gnus-nntp-server)
 102                                              gnus-secondary-servers))
 103                                nil nil gnus-nntp-server)))
 104
 105       (when (and gnus-nntp-server
 106                  (stringp gnus-nntp-server)
 107                  (not (string= gnus-nntp-server "")))
 108         (setq gnus-select-method
 109               (cond ((or (string= gnus-nntp-server "")
 110                          (string= gnus-nntp-server "::"))
 111                      (list 'nnspool (system-name)))
 112                     ((string-match "^:" gnus-nntp-server)
 113                      (list 'nnmh gnus-nntp-server
 114                            (list 'nnmh-directory
 115                                  (file-name-as-directory
 116                                   (expand-file-name
 117                                    (substring gnus-nntp-server 1) "~/")))
 118                            (list 'nnmh-get-new-mail nil)))
 119                     (t
 120                      (list 'nntp gnus-nntp-server)))))
 121
 122       (setq how (car gnus-select-method))
 123       (cond
 124        ((eq how 'nnspool)
 125         (require 'nnspool)
 126         (gnus-message 5 "Looking up local news spool..."))
 127        ((eq how 'nnmh)
 128         (require 'nnmh)
 129         (gnus-message 5 "Looking up mh spool..."))
 130        (t
 131         (require 'nntp)))
 132       (setq gnus-current-select-method gnus-select-method)
 133       (gnus-run-hooks 'gnus-open-server-hook)
 134
 135       ;; Partially validate agent covered methods now that the
 136       ;; gnus-select-method is known.
 137
 138       (if gnus-agent
 139           ;; NOTE: This is here for one purpose only.  By validating
 140           ;; the current select method, it converts the old 5.10.3,
 141           ;; and earlier, format to the current format.  That enables
 142           ;; the agent code within gnus-open-server to function
 143           ;; correctly.
 144           (gnus-agent-read-servers-validate-native gnus-select-method))
 145
 146       (or
 147        ;; gnus-open-server-hook might have opened it
 148        (gnus-server-opened gnus-select-method)
 149        (gnus-open-server gnus-select-method)
 150        gnus-batch-mode
 151        (gnus-y-or-n-p
 152         (format
 153          "%s (%s) open error: '%s'.  Continue? "
 154          (car gnus-select-method) (cadr gnus-select-method)
 155          (gnus-status-message gnus-select-method)))
 156        (gnus-error 1 "Couldn't open server on %s"
 157                    (nth 1 gnus-select-method))))))
 158
 159 (defun gnus-check-group (group)
 160   "Try to make sure that the server where GROUP exists is alive."
 161   (let ((method (gnus-find-method-for-group group)))
 162     (or (gnus-server-opened method)
 163         (gnus-open-server method))))
 164
 165 (defun gnus-check-server (&optional method silent)
 166   "Check whether the connection to METHOD is down.
 167 If METHOD is nil, use `gnus-select-method'.
 168 If it is down, start it up (again)."
 169   (let ((method (or method gnus-select-method))
 170         result)
 171     ;; Transform virtual server names into select methods.
 172     (when (stringp method)
 173       (setq method (gnus-server-to-method method)))
 174     (if (gnus-server-opened method)
 175         ;; The stream is already opened.
 176         t
 177       ;; Open the server.
 178       (unless silent
 179         (gnus-message 5 "Opening %s server%s..." (car method)
 180                       (if (equal (nth 1 method) "") ""
 181                         (format " on %s" (nth 1 method)))))
 182       (gnus-run-hooks 'gnus-open-server-hook)
 183       (prog1
 184           (condition-case ()
 185               (setq result (gnus-open-server method))
 186             (quit (message "Quit gnus-check-server")
 187                   nil))
 188         (unless silent
 189           (gnus-message 5 "Opening %s server%s...%s" (car method)
 190                         (if (equal (nth 1 method) "") ""
 191                           (format " on %s" (nth 1 method)))
 192                         (if result "done" "failed")))))))
 193
 194 (defun gnus-get-function (method function &optional noerror)
 195   "Return a function symbol based on METHOD and FUNCTION."
 196   ;; Translate server names into methods.
 197   (unless method
 198     (error "Attempted use of a nil select method"))
 199   (when (stringp method)
 200     (setq method (gnus-server-to-method method)))
 201   ;; Check cache of constructed names.
 202   (let* ((method-sym (if gnus-agent
 203                          (inline (gnus-agent-get-function method))
 204                        (car method)))
 205          (method-fns (get method-sym 'gnus-method-functions))
 206          (func (let ((method-fnlist-elt (assq function method-fns)))
 207                  (unless method-fnlist-elt
 208                    (setq method-fnlist-elt
 209                          (cons function
 210                                (intern (format "%s-%s" method-sym function))))
 211                    (put method-sym 'gnus-method-functions
 212                         (cons method-fnlist-elt method-fns)))
 213                  (cdr method-fnlist-elt))))
 214     ;; Maybe complain if there is no function.
 215     (unless (fboundp func)
 216       (unless (car method)
 217         (error "Trying to require a method that doesn't exist"))
 218       (require (car method))
 219       (when (not (fboundp func))
 220         (if noerror
 221             (setq func nil)
 222           (error "No such function: %s" func))))
 223     func))
 224
 225 \f
 226 ;;;
 227 ;;; Interface functions to the backends.
 228 ;;;
 229
 230 (defun gnus-open-server (gnus-command-method)
 231   "Open a connection to GNUS-COMMAND-METHOD."
 232   (when (stringp gnus-command-method)
 233     (setq gnus-command-method (gnus-server-to-method gnus-command-method)))
 234   (let ((elem (assoc gnus-command-method gnus-opened-servers))
 235         (server (gnus-method-to-server-name gnus-command-method)))
 236     ;; If this method was previously denied, we just return nil.
 237     (if (eq (nth 1 elem) 'denied)
 238         (progn
 239           (gnus-message 1 "Denied server %s" server)
 240           nil)
 241       ;; Open the server.
 242       (let* ((open-server-function (gnus-get-function gnus-command-method 'open-server))
 243              (result
 244              (condition-case err
 245                  (funcall open-server-function
 246                           (nth 1 gnus-command-method)
 247                           (nthcdr 2 gnus-command-method))
 248                (error
 249                 (gnus-message 1 (format
 250                                  "Unable to open server %s due to: %s"
 251                                  server (error-message-string err)))
 252                 nil)
 253                (quit
 254                 (gnus-message 1 "Quit trying to open server %s" server)
 255                 nil)))
 256             open-offline)
 257         ;; If this hasn't been opened before, we add it to the list.
 258         (unless elem
 259           (setq elem (list gnus-command-method nil)
 260                 gnus-opened-servers (cons elem gnus-opened-servers)))
 261         ;; Set the status of this server.
 262         (setcar (cdr elem)
 263                 (cond (result
 264                        (if (eq open-server-function #'nnagent-open-server)
 265                            ;; The agent's backend has a "special" status
 266                            'offline
 267                          'ok))
 268                       ((and gnus-agent
 269                             (gnus-agent-method-p gnus-command-method))
 270                        (cond (gnus-server-unopen-status
 271                               ;; Set the server's status to the unopen
 272                               ;; status.  If that status is offline,
 273                               ;; recurse to open the agent's backend.
 274                               (setq open-offline (eq gnus-server-unopen-status 'offline))
 275                               gnus-server-unopen-status)
 276                              ((and
 277                                (not gnus-batch-mode)
 278                                (gnus-y-or-n-p
 279                                 (format
 280                                  "Unable to open server %s, go offline? "
 281                                  server)))
 282                               (setq open-offline t)
 283                               'offline)
 284                              (t
 285                               ;; This agentized server was still denied
 286                               'denied)))
 287                       (t
 288                        ;; This unagentized server must be denied
 289                        'denied)))
 290
 291         ;; NOTE: I MUST set the server's status to offline before this
 292         ;; recursive call as this status will drive the
 293         ;; gnus-get-function (called above) to return the agent's
 294         ;; backend.
 295         (if open-offline
 296             ;; Recursively open this offline server to perform the
 297             ;; open-server function of the agent's backend.
 298             (let ((gnus-server-unopen-status 'denied))
 299               ;; Bind gnus-server-unopen-status to avoid recursively
 300               ;; prompting with "go offline?".  This is only a concern
 301               ;; when the agent's backend fails to open the server.
 302               (gnus-open-server gnus-command-method))
 303           (when (and (eq (cadr elem) 'ok) gnus-agent
 304                      (gnus-agent-method-p gnus-command-method))
 305             (save-excursion
 306               (gnus-agent-possibly-synchronize-flags-server
 307                gnus-command-method)))
 308           result)))))
 309
 310 (defun gnus-close-server (gnus-command-method)
 311   "Close the connection to GNUS-COMMAND-METHOD."
 312   (when (stringp gnus-command-method)
 313     (setq gnus-command-method (gnus-server-to-method gnus-command-method)))
 314   (funcall (gnus-get-function gnus-command-method 'close-server)
 315            (nth 1 gnus-command-method)))
 316
 317 (defun gnus-request-list (gnus-command-method)
 318   "Request the active file from GNUS-COMMAND-METHOD."
 319   (when (stringp gnus-command-method)
 320     (setq gnus-command-method (gnus-server-to-method gnus-command-method)))
 321   (funcall (gnus-get-function gnus-command-method 'request-list)
 322            (nth 1 gnus-command-method)))
 323
 324 (defun gnus-request-list-newsgroups (gnus-command-method)
 325   "Request the newsgroups file from GNUS-COMMAND-METHOD."
 326   (when (stringp gnus-command-method)
 327     (setq gnus-command-method (gnus-server-to-method gnus-command-method)))
 328   (funcall (gnus-get-function gnus-command-method 'request-list-newsgroups)
 329            (nth 1 gnus-command-method)))
 330
 331 (defun gnus-request-newgroups (date gnus-command-method)
 332   "Request all new groups since DATE from GNUS-COMMAND-METHOD."
 333   (when (stringp gnus-command-method)
 334     (setq gnus-command-method (gnus-server-to-method gnus-command-method)))
 335   (let ((func (gnus-get-function gnus-command-method 'request-newgroups t)))
 336     (when func
 337       (funcall func date (nth 1 gnus-command-method)))))
 338
 339 (defun gnus-request-regenerate (gnus-command-method)
 340   "Request a data generation from GNUS-COMMAND-METHOD."
 341   (when (stringp gnus-command-method)
 342     (setq gnus-command-method (gnus-server-to-method gnus-command-method)))
 343   (funcall (gnus-get-function gnus-command-method 'request-regenerate)
 344            (nth 1 gnus-command-method)))
 345
 346 (defun gnus-request-compact-group (group)
 347   (let* ((method (gnus-find-method-for-group group))
 348          (gnus-command-method method)
 349          (result
 350           (funcall (gnus-get-function gnus-command-method
 351                                       'request-compact-group)
 352                    (gnus-group-real-name group)
 353                    (nth 1 gnus-command-method) t)))
 354     result))
 355
 356 (defun gnus-request-compact (gnus-command-method)
 357   "Request groups compaction  from GNUS-COMMAND-METHOD."
 358   (when (stringp gnus-command-method)
 359     (setq gnus-command-method (gnus-server-to-method gnus-command-method)))
 360   (funcall (gnus-get-function gnus-command-method 'request-compact)
 361            (nth 1 gnus-command-method)))
 362
 363 (defun gnus-request-group (group &optional dont-check gnus-command-method)
 364   "Request GROUP.  If DONT-CHECK, no information is required."
 365   (let ((gnus-command-method
 366          (or gnus-command-method (inline (gnus-find-method-for-group group)))))
 367     (when (stringp gnus-command-method)
 368       (setq gnus-command-method
 369             (inline (gnus-server-to-method gnus-command-method))))
 370          (funcall (inline (gnus-get-function gnus-command-method 'request-group))
 371              (gnus-group-real-name group) (nth 1 gnus-command-method)
 372              dont-check)))
 373
 374 (defun gnus-list-active-group (group)
 375   "Request active information on GROUP."
 376   (let ((gnus-command-method (gnus-find-method-for-group group))
 377         (func 'list-active-group))
 378     (when (gnus-check-backend-function func group)
 379       (funcall (gnus-get-function gnus-command-method func)
 380                (gnus-group-real-name group) (nth 1 gnus-command-method)))))
 381
 382 (defun gnus-request-group-description (group)
 383   "Request a description of GROUP."
 384   (let ((gnus-command-method (gnus-find-method-for-group group))
 385         (func 'request-group-description))
 386     (when (gnus-check-backend-function func group)
 387       (funcall (gnus-get-function gnus-command-method func)
 388                (gnus-group-real-name group) (nth 1 gnus-command-method)))))
 389
 390 (defun gnus-request-group-articles (group)
 391   "Request a list of existing articles in GROUP."
 392   (let ((gnus-command-method (gnus-find-method-for-group group))
 393         (func 'request-group-articles))
 394     (when (gnus-check-backend-function func group)
 395       (funcall (gnus-get-function gnus-command-method func)
 396                (gnus-group-real-name group) (nth 1 gnus-command-method)))))
 397
 398 (defun gnus-close-group (group)
 399   "Request the GROUP be closed."
 400   (let ((gnus-command-method (inline (gnus-find-method-for-group group))))
 401     (funcall (gnus-get-function gnus-command-method 'close-group)
 402              (gnus-group-real-name group) (nth 1 gnus-command-method))))
 403
 404 (defun gnus-retrieve-headers (articles group &optional fetch-old)
 405   "Request headers for ARTICLES in GROUP.
 406 If FETCH-OLD, retrieve all headers (or some subset thereof) in the group."
 407   (let ((gnus-command-method (gnus-find-method-for-group group)))
 408     (cond
 409      ((and gnus-use-cache (numberp (car articles)))
 410       (gnus-cache-retrieve-headers articles group fetch-old))
 411      ((and gnus-agent (gnus-online gnus-command-method)
 412            (gnus-agent-method-p gnus-command-method))
 413       (gnus-agent-retrieve-headers articles group fetch-old))
 414      (t
 415       (funcall (gnus-get-function gnus-command-method 'retrieve-headers)
 416                articles (gnus-group-real-name group)
 417                (nth 1 gnus-command-method) fetch-old)))))
 418
 419 (defun gnus-retrieve-articles (articles group)
 420   "Request ARTICLES in GROUP."
 421   (let ((gnus-command-method (gnus-find-method-for-group group)))
 422     (funcall (gnus-get-function gnus-command-method 'retrieve-articles)
 423              articles (gnus-group-real-name group)
 424              (nth 1 gnus-command-method))))
 425
 426 (defun gnus-retrieve-groups (groups gnus-command-method)
 427   "Request active information on GROUPS from GNUS-COMMAND-METHOD."
 428   (when (stringp gnus-command-method)
 429     (setq gnus-command-method (gnus-server-to-method gnus-command-method)))
 430   (funcall (gnus-get-function gnus-command-method 'retrieve-groups)
 431            groups (nth 1 gnus-command-method)))
 432
 433 (defun gnus-request-type (group &optional article)
 434   "Return the type (`post' or `mail') of GROUP (and ARTICLE)."
 435   (let ((gnus-command-method (gnus-find-method-for-group group)))
 436     (if (not (gnus-check-backend-function
 437               'request-type (car gnus-command-method)))
 438         'unknown
 439       (funcall (gnus-get-function gnus-command-method 'request-type)
 440                (gnus-group-real-name group) article))))
 441
 442 (defun gnus-request-set-mark (group action)
 443   "Set marks on articles in the back end."
 444   (let ((gnus-command-method (gnus-find-method-for-group group)))
 445     (if (not (gnus-check-backend-function
 446               'request-set-mark (car gnus-command-method)))
 447         action
 448       (funcall (gnus-get-function gnus-command-method 'request-set-mark)
 449                (gnus-group-real-name group) action
 450                (nth 1 gnus-command-method)))))
 451
 452 (defun gnus-request-update-mark (group article mark)
 453   "Allow the back end to change the mark the user tries to put on an article."
 454   (let ((gnus-command-method (gnus-find-method-for-group group)))
 455     (if (not (gnus-check-backend-function
 456               'request-update-mark (car gnus-command-method)))
 457         mark
 458       (funcall (gnus-get-function gnus-command-method 'request-update-mark)
 459                (gnus-group-real-name group) article mark))))
 460
 461 (defun gnus-request-article (article group &optional buffer)
 462   "Request the ARTICLE in GROUP.
 463 ARTICLE can either be an article number or an article Message-ID.
 464 If BUFFER, insert the article in that group."
 465   (let ((gnus-command-method (gnus-find-method-for-group group)))
 466     (funcall (gnus-get-function gnus-command-method 'request-article)
 467              article (gnus-group-real-name group)
 468              (nth 1 gnus-command-method) buffer)))
 469
 470 (defun gnus-request-head (article group)
 471   "Request the head of ARTICLE in GROUP."
 472   (let* ((gnus-command-method (gnus-find-method-for-group group))
 473          (head (gnus-get-function gnus-command-method 'request-head t))
 474          res clean-up)
 475     (cond
 476      ;; Check the cache.
 477      ((and gnus-use-cache
 478            (numberp article)
 479            (gnus-cache-request-article article group))
 480       (setq res (cons group article)
 481             clean-up t))
 482      ;; Check the agent cache.
 483      ((gnus-agent-request-article article group)
 484       (setq res (cons group article)
 485             clean-up t))
 486      ;; Use `head' function.
 487      ((fboundp head)
 488       (setq res (funcall head article (gnus-group-real-name group)
 489                          (nth 1 gnus-command-method))))
 490      ;; Use `article' function.
 491      (t
 492       (setq res (gnus-request-article article group)
 493             clean-up t)))
 494     (when clean-up
 495       (save-excursion
 496         (set-buffer nntp-server-buffer)
 497         (goto-char (point-min))
 498         (when (search-forward "\n\n" nil t)
 499           (delete-region (1- (point)) (point-max)))
 500         (nnheader-fold-continuation-lines)))
 501     res))
 502
 503 (defun gnus-request-body (article group)
 504   "Request the body of ARTICLE in GROUP."
 505   (let* ((gnus-command-method (gnus-find-method-for-group group))
 506          (head (gnus-get-function gnus-command-method 'request-body t))
 507          res clean-up)
 508     (cond
 509      ;; Check the cache.
 510      ((and gnus-use-cache
 511            (numberp article)
 512            (gnus-cache-request-article article group))
 513       (setq res (cons group article)
 514             clean-up t))
 515      ;; Check the agent cache.
 516      ((gnus-agent-request-article article group)
 517       (setq res (cons group article)
 518             clean-up t))
 519      ;; Use `head' function.
 520      ((fboundp head)
 521       (setq res (funcall head article (gnus-group-real-name group)
 522                          (nth 1 gnus-command-method))))
 523      ;; Use `article' function.
 524      (t
 525       (setq res (gnus-request-article article group)
 526             clean-up t)))
 527     (when clean-up
 528       (save-excursion
 529         (set-buffer nntp-server-buffer)
 530         (goto-char (point-min))
 531         (when (search-forward "\n\n" nil t)
 532           (delete-region (point-min) (1- (point))))))
 533     res))
 534
 535 (defun gnus-request-post (gnus-command-method)
 536   "Post the current buffer using GNUS-COMMAND-METHOD."
 537   (when (stringp gnus-command-method)
 538     (setq gnus-command-method (gnus-server-to-method gnus-command-method)))
 539   (funcall (gnus-get-function gnus-command-method 'request-post)
 540            (nth 1 gnus-command-method)))
 541
 542 (defun gnus-request-scan (group gnus-command-method)
 543   "Request a SCAN being performed in GROUP from GNUS-COMMAND-METHOD.
 544 If GROUP is nil, all groups on GNUS-COMMAND-METHOD are scanned."
 545   (let ((gnus-command-method
 546          (if group (gnus-find-method-for-group group) gnus-command-method))
 547         (gnus-inhibit-demon t)
 548         (mail-source-plugged gnus-plugged))
 549     (when (or gnus-plugged (not (gnus-agent-method-p gnus-command-method)))
 550       (setq gnus-internal-registry-spool-current-method gnus-command-method)
 551       (funcall (gnus-get-function gnus-command-method 'request-scan)
 552                (and group (gnus-group-real-name group))
 553                (nth 1 gnus-command-method)))))
 554
 555 (defsubst gnus-request-update-info (info gnus-command-method)
 556   "Request that GNUS-COMMAND-METHOD update INFO."
 557   (when (stringp gnus-command-method)
 558     (setq gnus-command-method (gnus-server-to-method gnus-command-method)))
 559   (when (gnus-check-backend-function
 560          'request-update-info (car gnus-command-method))
 561     (let ((group (gnus-info-group info)))
 562       (and (funcall (gnus-get-function gnus-command-method
 563                                        'request-update-info)
 564                     (gnus-group-real-name group)
 565                     info (nth 1 gnus-command-method))
 566            ;; If the minimum article number is greater than 1, then all
 567            ;; smaller article numbers are known not to exist; we'll
 568            ;; artificially add those to the 'read range.
 569            (let* ((active (gnus-active group))
 570                   (min (car active)))
 571              (when (> min 1)
 572                (let* ((range (if (= min 2) 1 (cons 1 (1- min))))
 573                       (read (gnus-info-read info))
 574                       (new-read (gnus-range-add read (list range))))
 575                  (gnus-info-set-read info new-read)))
 576              info)))))
 577
 578 (defun gnus-request-expire-articles (articles group &optional force)
 579   (let* ((gnus-command-method (gnus-find-method-for-group group))
 580          (not-deleted
 581           (funcall
 582            (gnus-get-function gnus-command-method 'request-expire-articles)
 583            articles (gnus-group-real-name group) (nth 1 gnus-command-method)
 584            force)))
 585     (when (and gnus-agent
 586                (gnus-agent-method-p gnus-command-method))
 587       (let ((expired-articles (gnus-sorted-difference articles not-deleted)))
 588         (when expired-articles
 589           (gnus-agent-expire expired-articles group 'force))))
 590     not-deleted))
 591
 592 (defun gnus-request-move-article (article group server accept-function
 593                                           &optional last move-is-internal)
 594   (let* ((gnus-command-method (gnus-find-method-for-group group))
 595          (result (funcall (gnus-get-function gnus-command-method
 596                                              'request-move-article)
 597                           article (gnus-group-real-name group)
 598                           (nth 1 gnus-command-method) accept-function last move-is-internal)))
 599     (when (and result gnus-agent
 600                (gnus-agent-method-p gnus-command-method))
 601       (gnus-agent-unfetch-articles group (list article)))
 602     result))
 603
 604 (defun gnus-request-accept-article (group &optional gnus-command-method last
 605                                           no-encode)
 606   ;; Make sure there's a newline at the end of the article.
 607   (when (stringp gnus-command-method)
 608     (setq gnus-command-method (gnus-server-to-method gnus-command-method)))
 609   (when (and (not gnus-command-method)
 610              (stringp group))
 611     (setq gnus-command-method (or (gnus-find-method-for-group group)
 612                                   (gnus-group-name-to-method group))))
 613   (goto-char (point-max))
 614   (unless (bolp)
 615     (insert "\n"))
 616   (unless no-encode
 617     (let ((message-options message-options))
 618       (message-options-set-recipient)
 619       (save-restriction
 620         (message-narrow-to-head)
 621         (let ((mail-parse-charset message-default-charset))
 622           (mail-encode-encoded-word-buffer)))
 623       (message-encode-message-body)))
 624   (let ((gnus-command-method (or gnus-command-method
 625                                  (gnus-find-method-for-group group)))
 626         (result
 627          (funcall
 628           (gnus-get-function gnus-command-method 'request-accept-article)
 629           (if (stringp group) (gnus-group-real-name group) group)
 630           (cadr gnus-command-method)
 631           last)))
 632     (when (and gnus-agent (gnus-agent-method-p gnus-command-method))
 633       (gnus-agent-regenerate-group group (list (cdr result))))
 634     result))
 635
 636 (defun gnus-request-replace-article (article group buffer &optional no-encode)
 637   (unless no-encode
 638     (let ((message-options message-options))
 639       (message-options-set-recipient)
 640       (save-restriction
 641         (message-narrow-to-head)
 642         (let ((mail-parse-charset message-default-charset))
 643           (mail-encode-encoded-word-buffer)))
 644       (message-encode-message-body)))
 645   (let* ((func (car (gnus-group-name-to-method group)))
 646          (result (funcall (intern (format "%s-request-replace-article" func))
 647                           article (gnus-group-real-name group) buffer)))
 648     (when (and gnus-agent (gnus-agent-method-p gnus-command-method))
 649       (gnus-agent-regenerate-group group (list article)))
 650     result))
 651
 652 (defun gnus-request-associate-buffer (group)
 653   (let ((gnus-command-method (gnus-find-method-for-group group)))
 654     (funcall (gnus-get-function gnus-command-method 'request-associate-buffer)
 655              (gnus-group-real-name group))))
 656
 657 (defun gnus-request-restore-buffer (article group)
 658   "Request a new buffer restored to the state of ARTICLE."
 659   (let ((gnus-command-method (gnus-find-method-for-group group)))
 660     (funcall (gnus-get-function gnus-command-method 'request-restore-buffer)
 661              article (gnus-group-real-name group)
 662              (nth 1 gnus-command-method))))
 663
 664 (defun gnus-request-create-group (group &optional gnus-command-method args)
 665   (when (stringp gnus-command-method)
 666     (setq gnus-command-method (gnus-server-to-method gnus-command-method)))
 667   (let ((gnus-command-method
 668          (or gnus-command-method (gnus-find-method-for-group group))))
 669     (funcall (gnus-get-function gnus-command-method 'request-create-group)
 670              (gnus-group-real-name group) (nth 1 gnus-command-method) args)))
 671
 672 (defun gnus-request-delete-group (group &optional force)
 673   (let* ((gnus-command-method (gnus-find-method-for-group group))
 674          (result
 675           (funcall (gnus-get-function gnus-command-method 'request-delete-group)
 676                    (gnus-group-real-name group) force (nth 1 gnus-command-method))))
 677     (when result
 678       (gnus-cache-delete-group group)
 679       (gnus-agent-delete-group group))
 680     result))
 681
 682 (defun gnus-request-rename-group (group new-name)
 683   (let* ((gnus-command-method (gnus-find-method-for-group group))
 684          (result
 685           (funcall (gnus-get-function gnus-command-method 'request-rename-group)
 686                    (gnus-group-real-name group)
 687                    (gnus-group-real-name new-name) (nth 1 gnus-command-method))))
 688     (when result
 689       (gnus-cache-rename-group group new-name)
 690       (gnus-agent-rename-group group new-name))
 691     result))
 692
 693 (defun gnus-close-backends ()
 694   ;; Send a close request to all backends that support such a request.
 695   (let ((methods gnus-valid-select-methods)
 696         (gnus-inhibit-demon t)
 697         func gnus-command-method)
 698     (while (setq gnus-command-method (pop methods))
 699       (when (fboundp (setq func (intern
 700                                  (concat (car gnus-command-method)
 701                                          "-request-close"))))
 702         (funcall func)))))
 703
 704 (defun gnus-asynchronous-p (gnus-command-method)
 705   (let ((func (gnus-get-function gnus-command-method 'asynchronous-p t)))
 706     (when (fboundp func)
 707       (funcall func))))
 708
 709 (defun gnus-remove-denial (gnus-command-method)
 710   (when (stringp gnus-command-method)
 711     (setq gnus-command-method (gnus-server-to-method gnus-command-method)))
 712   (let* ((elem (assoc gnus-command-method gnus-opened-servers))
 713          (status (cadr elem)))
 714     ;; If this hasn't been opened before, we add it to the list.
 715     (when (eq status 'denied)
 716       ;; Set the status of this server.
 717       (setcar (cdr elem) 'closed))))
 718
 719 (provide 'gnus-int)
 720
 721 ;; arch-tag: bbc90087-9b7f-4017-a92c-3abf180ac86d
 722 ;;; gnus-int.el ends here