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 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                              ((and
 254                                (not gnus-batch-mode)
 255                                (gnus-y-or-n-p
 256                                 (format "Unable to open %s:%s, go offline? "
 257                                         (car gnus-command-method)
 258                                         (cadr gnus-command-method))))
 259                               (setq open-offline t)
 260                               'offline)
 261                              (t
 262                               ;; This agentized server was still denied
 263                               'denied)))
 264                       (t
 265                        ;; This unagentized server must be denied
 266                        'denied)))
 267
 268         ;; NOTE: I MUST set the server's status to offline before this
 269         ;; recursive call as this status will drive the
 270         ;; gnus-get-function (called above) to return the agent's
 271         ;; backend.
 272         (if open-offline
 273             ;; Recursively open this offline server to perform the
 274             ;; open-server function of the agent's backend.
 275             (let ((gnus-server-unopen-status 'denied))
 276               ;; Bind gnus-server-unopen-status to avoid recursively
 277               ;; prompting with "go offline?".  This is only a concern
 278               ;; when the agent's backend fails to open the server.
 279               (gnus-open-server gnus-command-method))
 280           result)))))
 281
 282 (defun gnus-close-server (gnus-command-method)
 283   "Close the connection to GNUS-COMMAND-METHOD."
 284   (when (stringp gnus-command-method)
 285     (setq gnus-command-method (gnus-server-to-method gnus-command-method)))
 286   (funcall (gnus-get-function gnus-command-method 'close-server)
 287            (nth 1 gnus-command-method)))
 288
 289 (defun gnus-request-list (gnus-command-method)
 290   "Request the active file from GNUS-COMMAND-METHOD."
 291   (when (stringp gnus-command-method)
 292     (setq gnus-command-method (gnus-server-to-method gnus-command-method)))
 293   (funcall (gnus-get-function gnus-command-method 'request-list)
 294            (nth 1 gnus-command-method)))
 295
 296 (defun gnus-request-list-newsgroups (gnus-command-method)
 297   "Request the newsgroups file from GNUS-COMMAND-METHOD."
 298   (when (stringp gnus-command-method)
 299     (setq gnus-command-method (gnus-server-to-method gnus-command-method)))
 300   (funcall (gnus-get-function gnus-command-method 'request-list-newsgroups)
 301            (nth 1 gnus-command-method)))
 302
 303 (defun gnus-request-newgroups (date gnus-command-method)
 304   "Request all new groups since DATE from GNUS-COMMAND-METHOD."
 305   (when (stringp gnus-command-method)
 306     (setq gnus-command-method (gnus-server-to-method gnus-command-method)))
 307   (let ((func (gnus-get-function gnus-command-method 'request-newgroups t)))
 308     (when func
 309       (funcall func date (nth 1 gnus-command-method)))))
 310
 311 (defun gnus-server-opened (gnus-command-method)
 312   "Check whether a connection to GNUS-COMMAND-METHOD has been opened."
 313   (unless (eq (gnus-server-status gnus-command-method)
 314               'denied)
 315     (when (stringp gnus-command-method)
 316       (setq gnus-command-method (gnus-server-to-method gnus-command-method)))
 317     (funcall (inline (gnus-get-function gnus-command-method 'server-opened))
 318              (nth 1 gnus-command-method))))
 319
 320 (defun gnus-status-message (gnus-command-method)
 321   "Return the status message from GNUS-COMMAND-METHOD.
 322 If GNUS-COMMAND-METHOD is a string, it is interpreted as a group
 323 name.  The method this group uses will be queried."
 324   (let ((gnus-command-method
 325          (if (stringp gnus-command-method)
 326              (gnus-find-method-for-group gnus-command-method)
 327            gnus-command-method)))
 328     (funcall (gnus-get-function gnus-command-method 'status-message)
 329              (nth 1 gnus-command-method))))
 330
 331 (defun gnus-request-regenerate (gnus-command-method)
 332   "Request a data generation from GNUS-COMMAND-METHOD."
 333   (when (stringp gnus-command-method)
 334     (setq gnus-command-method (gnus-server-to-method gnus-command-method)))
 335   (funcall (gnus-get-function gnus-command-method 'request-regenerate)
 336            (nth 1 gnus-command-method)))
 337
 338 (defun gnus-request-group (group &optional dont-check gnus-command-method)
 339   "Request GROUP.  If DONT-CHECK, no information is required."
 340   (let ((gnus-command-method
 341          (or gnus-command-method (inline (gnus-find-method-for-group group)))))
 342     (when (stringp gnus-command-method)
 343       (setq gnus-command-method
 344             (inline (gnus-server-to-method gnus-command-method))))
 345     (funcall (inline (gnus-get-function gnus-command-method 'request-group))
 346              (gnus-group-real-name group) (nth 1 gnus-command-method)
 347              dont-check)))
 348
 349 (defun gnus-list-active-group (group)
 350   "Request active information on GROUP."
 351   (let ((gnus-command-method (gnus-find-method-for-group group))
 352         (func 'list-active-group))
 353     (when (gnus-check-backend-function func group)
 354       (funcall (gnus-get-function gnus-command-method func)
 355                (gnus-group-real-name group) (nth 1 gnus-command-method)))))
 356
 357 (defun gnus-request-group-description (group)
 358   "Request a description of GROUP."
 359   (let ((gnus-command-method (gnus-find-method-for-group group))
 360         (func 'request-group-description))
 361     (when (gnus-check-backend-function func group)
 362       (funcall (gnus-get-function gnus-command-method func)
 363                (gnus-group-real-name group) (nth 1 gnus-command-method)))))
 364
 365 (defun gnus-request-group-articles (group)
 366   "Request a list of existing articles in GROUP."
 367   (let ((gnus-command-method (gnus-find-method-for-group group))
 368         (func 'request-group-articles))
 369     (when (gnus-check-backend-function func group)
 370       (funcall (gnus-get-function gnus-command-method func)
 371                (gnus-group-real-name group) (nth 1 gnus-command-method)))))
 372
 373 (defun gnus-close-group (group)
 374   "Request the GROUP be closed."
 375   (let ((gnus-command-method (inline (gnus-find-method-for-group group))))
 376     (funcall (gnus-get-function gnus-command-method 'close-group)
 377              (gnus-group-real-name group) (nth 1 gnus-command-method))))
 378
 379 (defun gnus-retrieve-headers (articles group &optional fetch-old)
 380   "Request headers for ARTICLES in GROUP.
 381 If FETCH-OLD, retrieve all headers (or some subset thereof) in the group."
 382   (let ((gnus-command-method (gnus-find-method-for-group group)))
 383     (cond
 384      ((and gnus-use-cache (numberp (car articles)))
 385       (gnus-cache-retrieve-headers articles group fetch-old))
 386      ((and gnus-agent (gnus-online gnus-command-method)
 387            (gnus-agent-method-p gnus-command-method))
 388       (gnus-agent-retrieve-headers articles group fetch-old))
 389      (t
 390       (funcall (gnus-get-function gnus-command-method 'retrieve-headers)
 391                articles (gnus-group-real-name group)
 392                (nth 1 gnus-command-method) fetch-old)))))
 393
 394 (defun gnus-retrieve-articles (articles group)
 395   "Request ARTICLES in GROUP."
 396   (let ((gnus-command-method (gnus-find-method-for-group group)))
 397     (funcall (gnus-get-function gnus-command-method 'retrieve-articles)
 398              articles (gnus-group-real-name group)
 399              (nth 1 gnus-command-method))))
 400
 401 (defun gnus-retrieve-groups (groups gnus-command-method)
 402   "Request active information on GROUPS from GNUS-COMMAND-METHOD."
 403   (when (stringp gnus-command-method)
 404     (setq gnus-command-method (gnus-server-to-method gnus-command-method)))
 405   (funcall (gnus-get-function gnus-command-method 'retrieve-groups)
 406            groups (nth 1 gnus-command-method)))
 407
 408 (defun gnus-request-type (group &optional article)
 409   "Return the type (`post' or `mail') of GROUP (and ARTICLE)."
 410   (let ((gnus-command-method (gnus-find-method-for-group group)))
 411     (if (not (gnus-check-backend-function
 412               'request-type (car gnus-command-method)))
 413         'unknown
 414       (funcall (gnus-get-function gnus-command-method 'request-type)
 415                (gnus-group-real-name group) article))))
 416
 417 (defun gnus-request-set-mark (group action)
 418   "Set marks on articles in the back end."
 419   (let ((gnus-command-method (gnus-find-method-for-group group)))
 420     (if (not (gnus-check-backend-function
 421               'request-set-mark (car gnus-command-method)))
 422         action
 423       (funcall (gnus-get-function gnus-command-method 'request-set-mark)
 424                (gnus-group-real-name group) action
 425                (nth 1 gnus-command-method)))))
 426
 427 (defun gnus-request-update-mark (group article mark)
 428   "Allow the back end to change the mark the user tries to put on an article."
 429   (let ((gnus-command-method (gnus-find-method-for-group group)))
 430     (if (not (gnus-check-backend-function
 431               'request-update-mark (car gnus-command-method)))
 432         mark
 433       (funcall (gnus-get-function gnus-command-method 'request-update-mark)
 434                (gnus-group-real-name group) article mark))))
 435
 436 (defun gnus-request-article (article group &optional buffer)
 437   "Request the ARTICLE in GROUP.
 438 ARTICLE can either be an article number or an article Message-ID.
 439 If BUFFER, insert the article in that group."
 440   (let ((gnus-command-method (gnus-find-method-for-group group)))
 441     (funcall (gnus-get-function gnus-command-method 'request-article)
 442              article (gnus-group-real-name group)
 443              (nth 1 gnus-command-method) buffer)))
 444
 445 (defun gnus-request-head (article group)
 446   "Request the head of ARTICLE in GROUP."
 447   (let* ((gnus-command-method (gnus-find-method-for-group group))
 448          (head (gnus-get-function gnus-command-method 'request-head t))
 449          res clean-up)
 450     (cond
 451      ;; Check the cache.
 452      ((and gnus-use-cache
 453            (numberp article)
 454            (gnus-cache-request-article article group))
 455       (setq res (cons group article)
 456             clean-up t))
 457      ;; Check the agent cache.
 458      ((gnus-agent-request-article article group)
 459       (setq res (cons group article)
 460             clean-up t))
 461      ;; Use `head' function.
 462      ((fboundp head)
 463       (setq res (funcall head article (gnus-group-real-name group)
 464                          (nth 1 gnus-command-method))))
 465      ;; Use `article' function.
 466      (t
 467       (setq res (gnus-request-article article group)
 468             clean-up t)))
 469     (when clean-up
 470       (save-excursion
 471         (set-buffer nntp-server-buffer)
 472         (goto-char (point-min))
 473         (when (search-forward "\n\n" nil t)
 474           (delete-region (1- (point)) (point-max)))
 475         (nnheader-fold-continuation-lines)))
 476     res))
 477
 478 (defun gnus-request-body (article group)
 479   "Request the body of ARTICLE in GROUP."
 480   (let* ((gnus-command-method (gnus-find-method-for-group group))
 481          (head (gnus-get-function gnus-command-method 'request-body t))
 482          res clean-up)
 483     (cond
 484      ;; Check the cache.
 485      ((and gnus-use-cache
 486            (numberp article)
 487            (gnus-cache-request-article article group))
 488       (setq res (cons group article)
 489             clean-up t))
 490      ;; Check the agent cache.
 491      ((gnus-agent-request-article article group)
 492       (setq res (cons group article)
 493             clean-up t))
 494      ;; Use `head' function.
 495      ((fboundp head)
 496       (setq res (funcall head article (gnus-group-real-name group)
 497                          (nth 1 gnus-command-method))))
 498      ;; Use `article' function.
 499      (t
 500       (setq res (gnus-request-article article group)
 501             clean-up t)))
 502     (when clean-up
 503       (save-excursion
 504         (set-buffer nntp-server-buffer)
 505         (goto-char (point-min))
 506         (when (search-forward "\n\n" nil t)
 507           (delete-region (point-min) (1- (point))))))
 508     res))
 509
 510 (defun gnus-request-post (gnus-command-method)
 511   "Post the current buffer using GNUS-COMMAND-METHOD."
 512   (when (stringp gnus-command-method)
 513     (setq gnus-command-method (gnus-server-to-method gnus-command-method)))
 514   (funcall (gnus-get-function gnus-command-method 'request-post)
 515            (nth 1 gnus-command-method)))
 516
 517 (defun gnus-request-scan (group gnus-command-method)
 518   "Request a SCAN being performed in GROUP from GNUS-COMMAND-METHOD.
 519 If GROUP is nil, all groups on GNUS-COMMAND-METHOD are scanned."
 520   (let ((gnus-command-method
 521          (if group (gnus-find-method-for-group group) gnus-command-method))
 522         (gnus-inhibit-demon t)
 523         (mail-source-plugged gnus-plugged))
 524     (if (or gnus-plugged (not (gnus-agent-method-p gnus-command-method)))
 525         (progn
 526           (setq gnus-internal-registry-spool-current-method gnus-command-method)
 527           (funcall (gnus-get-function gnus-command-method 'request-scan)
 528                    (and group (gnus-group-real-name group))
 529                    (nth 1 gnus-command-method))))))
 530
 531 (defsubst gnus-request-update-info (info gnus-command-method)
 532   "Request that GNUS-COMMAND-METHOD update INFO."
 533   (when (stringp gnus-command-method)
 534     (setq gnus-command-method (gnus-server-to-method gnus-command-method)))
 535   (when (gnus-check-backend-function
 536          'request-update-info (car gnus-command-method))
 537     (let ((group (gnus-info-group info)))
 538       (and (funcall (gnus-get-function gnus-command-method
 539                                        'request-update-info)
 540                     (gnus-group-real-name group)
 541                     info (nth 1 gnus-command-method))
 542            ;; If the minimum article number is greater than 1, then all
 543            ;; smaller article numbers are known not to exist; we'll
 544            ;; artificially add those to the 'read range.
 545            (let* ((active (gnus-active group))
 546                   (min (car active)))
 547              (when (> min 1)
 548                (let* ((range (if (= min 2) 1 (cons 1 (1- min))))
 549                       (read (gnus-info-read info))
 550                       (new-read (gnus-range-add read (list range))))
 551                  (gnus-info-set-read info new-read)))
 552              info)))))
 553
 554 (defun gnus-request-expire-articles (articles group &optional force)
 555   (let* ((gnus-command-method (gnus-find-method-for-group group))
 556          (not-deleted
 557           (funcall
 558            (gnus-get-function gnus-command-method 'request-expire-articles)
 559            articles (gnus-group-real-name group) (nth 1 gnus-command-method)
 560            force)))
 561     (when (and gnus-agent
 562                (gnus-agent-method-p gnus-command-method))
 563       (let ((expired-articles (gnus-sorted-difference articles not-deleted)))
 564         (when expired-articles
 565           (gnus-agent-expire expired-articles group 'force))))
 566     not-deleted))
 567
 568 (defun gnus-request-move-article (article group server accept-function
 569                                           &optional last)
 570   (let* ((gnus-command-method (gnus-find-method-for-group group))
 571          (result (funcall (gnus-get-function gnus-command-method
 572                                              'request-move-article)
 573                           article (gnus-group-real-name group)
 574                           (nth 1 gnus-command-method) accept-function last)))
 575     (when (and result gnus-agent
 576                (gnus-agent-method-p gnus-command-method))
 577       (gnus-agent-unfetch-articles group (list article)))
 578     result))
 579
 580 (defun gnus-request-accept-article (group &optional gnus-command-method last
 581                                           no-encode)
 582   ;; Make sure there's a newline at the end of the article.
 583   (when (stringp gnus-command-method)
 584     (setq gnus-command-method (gnus-server-to-method gnus-command-method)))
 585   (when (and (not gnus-command-method)
 586              (stringp group))
 587     (setq gnus-command-method (or (gnus-find-method-for-group group)
 588                                   (gnus-group-name-to-method group))))
 589   (goto-char (point-max))
 590   (unless (bolp)
 591     (insert "\n"))
 592   (unless no-encode
 593     (let ((message-options message-options))
 594       (message-options-set-recipient)
 595       (save-restriction
 596         (message-narrow-to-head)
 597         (let ((mail-parse-charset message-default-charset))
 598           (mail-encode-encoded-word-buffer)))
 599       (message-encode-message-body)))
 600 (let ((gnus-command-method (or gnus-command-method
 601                                  (gnus-find-method-for-group group)))
 602         (result
 603          (funcall
 604           (gnus-get-function gnus-command-method 'request-accept-article)
 605           (if (stringp group) (gnus-group-real-name group) group)
 606           (cadr gnus-command-method)
 607           last)))
 608     (when (and gnus-agent (gnus-agent-method-p gnus-command-method))
 609       (gnus-agent-regenerate-group group (list (cdr result))))
 610     result))
 611
 612 (defun gnus-request-replace-article (article group buffer &optional no-encode)
 613   (unless no-encode
 614     (let ((message-options message-options))
 615       (message-options-set-recipient)
 616       (save-restriction
 617         (message-narrow-to-head)
 618         (let ((mail-parse-charset message-default-charset))
 619           (mail-encode-encoded-word-buffer)))
 620       (message-encode-message-body)))
 621   (let* ((func (car (gnus-group-name-to-method group)))
 622          (result (funcall (intern (format "%s-request-replace-article" func))
 623                           article (gnus-group-real-name group) buffer)))
 624     (when (and gnus-agent (gnus-agent-method-p gnus-command-method))
 625       (gnus-agent-regenerate-group group (list article)))
 626     result))
 627
 628 (defun gnus-request-associate-buffer (group)
 629   (let ((gnus-command-method (gnus-find-method-for-group group)))
 630     (funcall (gnus-get-function gnus-command-method 'request-associate-buffer)
 631              (gnus-group-real-name group))))
 632
 633 (defun gnus-request-restore-buffer (article group)
 634   "Request a new buffer restored to the state of ARTICLE."
 635   (let ((gnus-command-method (gnus-find-method-for-group group)))
 636     (funcall (gnus-get-function gnus-command-method 'request-restore-buffer)
 637              article (gnus-group-real-name group)
 638              (nth 1 gnus-command-method))))
 639
 640 (defun gnus-request-create-group (group &optional gnus-command-method args)
 641   (when (stringp gnus-command-method)
 642     (setq gnus-command-method (gnus-server-to-method gnus-command-method)))
 643   (let ((gnus-command-method
 644          (or gnus-command-method (gnus-find-method-for-group group))))
 645     (funcall (gnus-get-function gnus-command-method 'request-create-group)
 646              (gnus-group-real-name group) (nth 1 gnus-command-method) args)))
 647
 648 (defun gnus-request-delete-group (group &optional force)
 649   (let* ((gnus-command-method (gnus-find-method-for-group group))
 650          (result
 651           (funcall (gnus-get-function gnus-command-method 'request-delete-group)
 652                    (gnus-group-real-name group) force (nth 1 gnus-command-method))))
 653     (when result
 654       (gnus-cache-delete-group group)
 655       (gnus-agent-delete-group group))
 656     result))
 657
 658 (defun gnus-request-rename-group (group new-name)
 659   (let* ((gnus-command-method (gnus-find-method-for-group group))
 660          (result
 661           (funcall (gnus-get-function gnus-command-method 'request-rename-group)
 662                    (gnus-group-real-name group)
 663                    (gnus-group-real-name new-name) (nth 1 gnus-command-method))))
 664     (when result
 665       (gnus-cache-rename-group group new-name)
 666       (gnus-agent-rename-group group new-name))
 667     result))
 668
 669 (defun gnus-close-backends ()
 670   ;; Send a close request to all backends that support such a request.
 671   (let ((methods gnus-valid-select-methods)
 672         (gnus-inhibit-demon t)
 673         func gnus-command-method)
 674     (while (setq gnus-command-method (pop methods))
 675       (when (fboundp (setq func (intern
 676                                  (concat (car gnus-command-method)
 677                                          "-request-close"))))
 678         (funcall func)))))
 679
 680 (defun gnus-asynchronous-p (gnus-command-method)
 681   (let ((func (gnus-get-function gnus-command-method 'asynchronous-p t)))
 682     (when (fboundp func)
 683       (funcall func))))
 684
 685 (defun gnus-remove-denial (gnus-command-method)
 686   (when (stringp gnus-command-method)
 687     (setq gnus-command-method (gnus-server-to-method gnus-command-method)))
 688   (let* ((elem (assoc gnus-command-method gnus-opened-servers))
 689          (status (cadr elem)))
 690     ;; If this hasn't been opened before, we add it to the list.
 691     (when (eq status 'denied)
 692       ;; Set the status of this server.
 693       (setcar (cdr elem) 'closed))))
 694
 695 (provide 'gnus-int)
 696
 697 ;;; arch-tag: bbc90087-9b7f-4017-a92c-3abf180ac86d
 698 ;;; gnus-int.el ends here