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