code.delx.au - gnu-emacs/blob - lisp/gnus/gnus-int.el

   1 ;;; gnus-int.el --- backend interface functions for Gnus
   2 ;; Copyright (C) 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003
   3 ;;        Free Software Foundation, Inc.
   4
   5 ;; Author: Lars Magne Ingebrigtsen <larsi@gnus.org>
   6 ;; Keywords: news
   7
   8 ;; This file is part of GNU Emacs.
   9
  10 ;; GNU Emacs is free software; you can redistribute it and/or modify
  11 ;; it under the terms of the GNU General Public License as published by
  12 ;; the Free Software Foundation; either version 2, or (at your option)
  13 ;; any later version.
  14
  15 ;; GNU Emacs is distributed in the hope that it will be useful,
  16 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  17 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18 ;; GNU General Public License for more details.
  19
  20 ;; You should have received a copy of the GNU General Public License
  21 ;; along with GNU Emacs; see the file COPYING.  If not, write to the
  22 ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  23 ;; Boston, MA 02111-1307, USA.
  24
  25 ;;; Commentary:
  26
  27 ;;; Code:
  28
  29 (eval-when-compile (require 'cl))
  30
  31 (require 'gnus)
  32 (require 'message)
  33 (require 'gnus-range)
  34
  35 (autoload 'gnus-agent-expire "gnus-agent")
  36 (autoload 'gnus-agent-read-servers-validate-native "gnus-agent")
  37
  38 (defcustom gnus-open-server-hook nil
  39   "Hook called just before opening connection to the news server."
  40   :group 'gnus-start
  41   :type 'hook)
  42
  43 (defcustom gnus-server-unopen-status nil
  44   "The default status if the server is not able to open.
  45 If the server is covered by Gnus agent, the possible values are
  46 `denied', set the server denied; `offline', set the server offline;
  47 nil, ask user.  If the server is not covered by Gnus agent, set the
  48 server denied."
  49   :group 'gnus-start
  50   :type '(choice (const :tag "Ask" nil)
  51                  (const :tag "Deny server" denied)
  52                  (const :tag "Unplug Agent" offline)))
  53
  54 (defvar gnus-internal-registry-spool-current-method nil
  55   "The current method, for the registry.")
  56
  57 ;;;
  58 ;;; Server Communication
  59 ;;;
  60
  61 (defun gnus-start-news-server (&optional confirm)
  62   "Open a method for getting news.
  63 If CONFIRM is non-nil, the user will be asked for an NNTP server."
  64   (let (how)
  65     (if gnus-current-select-method
  66         ;; Stream is already opened.
  67         nil
  68       ;; Open NNTP server.
  69       (unless gnus-nntp-service
  70         (setq gnus-nntp-server nil))
  71       (when confirm
  72         ;; Read server name with completion.
  73         (setq gnus-nntp-server
  74               (completing-read "NNTP server: "
  75                                (mapcar (lambda (server) (list server))
  76                                        (cons (list gnus-nntp-server)
  77                                              gnus-secondary-servers))
  78                                nil nil gnus-nntp-server)))
  79
  80       (when (and gnus-nntp-server
  81                  (stringp gnus-nntp-server)
  82                  (not (string= gnus-nntp-server "")))
  83         (setq gnus-select-method
  84               (cond ((or (string= gnus-nntp-server "")
  85                          (string= gnus-nntp-server "::"))
  86                      (list 'nnspool (system-name)))
  87                     ((string-match "^:" gnus-nntp-server)
  88                      (list 'nnmh gnus-nntp-server
  89                            (list 'nnmh-directory
  90                                  (file-name-as-directory
  91                                   (expand-file-name
  92                                    (substring gnus-nntp-server 1) "~/")))
  93                            (list 'nnmh-get-new-mail nil)))
  94                     (t
  95                      (list 'nntp gnus-nntp-server)))))
  96
  97       (setq how (car gnus-select-method))
  98       (cond
  99        ((eq how 'nnspool)
 100         (require 'nnspool)
 101         (gnus-message 5 "Looking up local news spool..."))
 102        ((eq how 'nnmh)
 103         (require 'nnmh)
 104         (gnus-message 5 "Looking up mh spool..."))
 105        (t
 106         (require 'nntp)))
 107       (setq gnus-current-select-method gnus-select-method)
 108       (gnus-run-hooks 'gnus-open-server-hook)
 109
 110       ;; Partially validate agent covered methods now that the
 111       ;; gnus-select-method is known.
 112
 113       (if gnus-agent
 114           ;; NOTE: This is here for one purpose only.  By validating
 115           ;; the current select method, it converts the old 5.10.3,
 116           ;; and earlier, format to the current format.  That enables
 117           ;; the agent code within gnus-open-server to function
 118           ;; correctly.
 119           (gnus-agent-read-servers-validate-native gnus-select-method))
 120
 121       (or
 122        ;; gnus-open-server-hook might have opened it
 123        (gnus-server-opened gnus-select-method)
 124        (gnus-open-server gnus-select-method)
 125        gnus-batch-mode
 126        (gnus-y-or-n-p
 127         (format
 128          "%s (%s) open error: '%s'.  Continue? "
 129          (car gnus-select-method) (cadr gnus-select-method)
 130          (gnus-status-message gnus-select-method)))
 131        (gnus-error 1 "Couldn't open server on %s"
 132                    (nth 1 gnus-select-method))))))
 133
 134 (defun gnus-check-group (group)
 135   "Try to make sure that the server where GROUP exists is alive."
 136   (let ((method (gnus-find-method-for-group group)))
 137     (or (gnus-server-opened method)
 138         (gnus-open-server method))))
 139
 140 (defun gnus-check-server (&optional method silent)
 141   "Check whether the connection to METHOD is down.
 142 If METHOD is nil, use `gnus-select-method'.
 143 If it is down, start it up (again)."
 144   (let ((method (or method gnus-select-method))
 145         result)
 146     ;; Transform virtual server names into select methods.
 147     (when (stringp method)
 148       (setq method (gnus-server-to-method method)))
 149     (if (gnus-server-opened method)
 150         ;; The stream is already opened.
 151         t
 152       ;; Open the server.
 153       (unless silent
 154         (gnus-message 5 "Opening %s server%s..." (car method)
 155                       (if (equal (nth 1 method) "") ""
 156                         (format " on %s" (nth 1 method)))))
 157       (gnus-run-hooks 'gnus-open-server-hook)
 158       (prog1
 159           (condition-case ()
 160               (setq result (gnus-open-server method))
 161             (quit (message "Quit gnus-check-server")
 162                   nil))
 163         (unless silent
 164           (gnus-message 5 "Opening %s server%s...%s" (car method)
 165                         (if (equal (nth 1 method) "") ""
 166                           (format " on %s" (nth 1 method)))
 167                         (if result "done" "failed")))))))
 168
 169 (defun gnus-get-function (method function &optional noerror)
 170   "Return a function symbol based on METHOD and FUNCTION."
 171   ;; Translate server names into methods.
 172   (unless method
 173     (error "Attempted use of a nil select method"))
 174   (when (stringp method)
 175     (setq method (gnus-server-to-method method)))
 176   ;; Check cache of constructed names.
 177   (let* ((method-sym (if gnus-agent
 178                          (gnus-agent-get-function method)
 179                        (car method)))
 180          (method-fns (get method-sym 'gnus-method-functions))
 181          (func (let ((method-fnlist-elt (assq function method-fns)))
 182                  (unless method-fnlist-elt
 183                    (setq method-fnlist-elt
 184                          (cons function
 185                                (intern (format "%s-%s" method-sym function))))
 186                    (put method-sym 'gnus-method-functions
 187                         (cons method-fnlist-elt method-fns)))
 188                  (cdr method-fnlist-elt))))
 189     ;; Maybe complain if there is no function.
 190     (unless (fboundp func)
 191       (unless (car method)
 192         (error "Trying to require a method that doesn't exist"))
 193       (require (car method))
 194       (when (not (fboundp func))
 195         (if noerror
 196             (setq func nil)
 197           (error "No such function: %s" func))))
 198     func))
 199
 200 \f
 201 ;;;
 202 ;;; Interface functions to the backends.
 203 ;;;
 204
 205 (defun gnus-open-server (gnus-command-method)
 206   "Open a connection to GNUS-COMMAND-METHOD."
 207   (when (stringp gnus-command-method)
 208     (setq gnus-command-method (gnus-server-to-method gnus-command-method)))
 209   (let ((elem (assoc gnus-command-method gnus-opened-servers)))
 210     ;; If this method was previously denied, we just return nil.
 211     (if (eq (nth 1 elem) 'denied)
 212         (progn
 213           (gnus-message 1 "Denied server")
 214           nil)
 215       ;; Open the server.
 216       (let* ((open-server-function (gnus-get-function gnus-command-method 'open-server))
 217              (result
 218              (condition-case err
 219                  (funcall open-server-function
 220                           (nth 1 gnus-command-method)
 221                           (nthcdr 2 gnus-command-method))
 222                (error
 223                 (gnus-message 1 (format
 224                                  "Unable to open server due to: %s"
 225                                  (error-message-string err)))
 226                 nil)
 227                (quit
 228                 (gnus-message 1 "Quit trying to open server")
 229                 nil)))
 230             open-offline)
 231         ;; If this hasn't been opened before, we add it to the list.
 232         (unless elem
 233           (setq elem (list gnus-command-method nil)
 234                 gnus-opened-servers (cons elem gnus-opened-servers)))
 235         ;; Set the status of this server.
 236         (setcar (cdr elem)
 237                 (cond (result
 238                        (if (eq open-server-function #'nnagent-open-server)
 239                            ;; The agent's backend has a "special" status
 240                            'offline
 241                          'ok))
 242                       ((and gnus-agent
 243                             (gnus-agent-method-p gnus-command-method))
 244                        (cond (gnus-server-unopen-status
 245                               ;; Set the server's status to the unopen
 246                               ;; status.  If that status is offline,
 247                               ;; recurse to open the agent's backend.
 248                               (setq open-offline (eq gnus-server-unopen-status 'offline))
 249                               gnus-server-unopen-status)
 250                              ((gnus-y-or-n-p
 251                                (format "Unable to open %s:%s, go offline? "
 252                                        (car gnus-command-method)
 253                                        (cadr gnus-command-method)))
 254                               (setq open-offline t)
 255                               'offline)
 256                              (t
 257                               ;; This agentized server was still denied
 258                               'denied)))
 259                       (t
 260                        ;; This unagentized server must be denied
 261                        'denied)))
 262
 263         ;; NOTE: I MUST set the server's status to offline before this
 264         ;; recursive call as this status will drive the
 265         ;; gnus-get-function (called above) to return the agent's
 266         ;; backend.
 267         (if open-offline
 268             ;; Recursively open this offline server to perform the
 269             ;; open-server function of the agent's backend.
 270             (let ((gnus-server-unopen-status 'denied))
 271               ;; Bind gnus-server-unopen-status to avoid recursively
 272               ;; prompting with "go offline?".  This is only a concern
 273               ;; when the agent's backend fails to open the server.
 274               (gnus-open-server gnus-command-method))
 275           result)))))
 276
 277 (defun gnus-close-server (gnus-command-method)
 278   "Close the connection to GNUS-COMMAND-METHOD."
 279   (when (stringp gnus-command-method)
 280     (setq gnus-command-method (gnus-server-to-method gnus-command-method)))
 281   (funcall (gnus-get-function gnus-command-method 'close-server)
 282            (nth 1 gnus-command-method)))
 283
 284 (defun gnus-request-list (gnus-command-method)
 285   "Request the active file from GNUS-COMMAND-METHOD."
 286   (when (stringp gnus-command-method)
 287     (setq gnus-command-method (gnus-server-to-method gnus-command-method)))
 288   (funcall (gnus-get-function gnus-command-method 'request-list)
 289            (nth 1 gnus-command-method)))
 290
 291 (defun gnus-request-list-newsgroups (gnus-command-method)
 292   "Request the newsgroups file from GNUS-COMMAND-METHOD."
 293   (when (stringp gnus-command-method)
 294     (setq gnus-command-method (gnus-server-to-method gnus-command-method)))
 295   (funcall (gnus-get-function gnus-command-method 'request-list-newsgroups)
 296            (nth 1 gnus-command-method)))
 297
 298 (defun gnus-request-newgroups (date gnus-command-method)
 299   "Request all new groups since DATE from GNUS-COMMAND-METHOD."
 300   (when (stringp gnus-command-method)
 301     (setq gnus-command-method (gnus-server-to-method gnus-command-method)))
 302   (let ((func (gnus-get-function gnus-command-method 'request-newgroups t)))
 303     (when func
 304       (funcall func date (nth 1 gnus-command-method)))))
 305
 306 (defun gnus-server-opened (gnus-command-method)
 307   "Check whether a connection to GNUS-COMMAND-METHOD has been opened."
 308   (unless (eq (gnus-server-status gnus-command-method)
 309               'denied)
 310     (when (stringp gnus-command-method)
 311       (setq gnus-command-method (gnus-server-to-method gnus-command-method)))
 312     (funcall (inline (gnus-get-function gnus-command-method 'server-opened))
 313              (nth 1 gnus-command-method))))
 314
 315 (defun gnus-status-message (gnus-command-method)
 316   "Return the status message from GNUS-COMMAND-METHOD.
 317 If GNUS-COMMAND-METHOD is a string, it is interpreted as a group
 318 name.  The method this group uses will be queried."
 319   (let ((gnus-command-method
 320          (if (stringp gnus-command-method)
 321              (gnus-find-method-for-group gnus-command-method)
 322            gnus-command-method)))
 323     (funcall (gnus-get-function gnus-command-method 'status-message)
 324              (nth 1 gnus-command-method))))
 325
 326 (defun gnus-request-regenerate (gnus-command-method)
 327   "Request a data generation from GNUS-COMMAND-METHOD."
 328   (when (stringp gnus-command-method)
 329     (setq gnus-command-method (gnus-server-to-method gnus-command-method)))
 330   (funcall (gnus-get-function gnus-command-method 'request-regenerate)
 331            (nth 1 gnus-command-method)))
 332
 333 (defun gnus-request-group (group &optional dont-check gnus-command-method)
 334   "Request GROUP.  If DONT-CHECK, no information is required."
 335   (let ((gnus-command-method
 336          (or gnus-command-method (inline (gnus-find-method-for-group group)))))
 337     (when (stringp gnus-command-method)
 338       (setq gnus-command-method
 339             (inline (gnus-server-to-method gnus-command-method))))
 340     (funcall (inline (gnus-get-function gnus-command-method 'request-group))
 341              (gnus-group-real-name group) (nth 1 gnus-command-method)
 342              dont-check)))
 343
 344 (defun gnus-list-active-group (group)
 345   "Request active information on GROUP."
 346   (let ((gnus-command-method (gnus-find-method-for-group group))
 347         (func 'list-active-group))
 348     (when (gnus-check-backend-function func group)
 349       (funcall (gnus-get-function gnus-command-method func)
 350                (gnus-group-real-name group) (nth 1 gnus-command-method)))))
 351
 352 (defun gnus-request-group-description (group)
 353   "Request a description of GROUP."
 354   (let ((gnus-command-method (gnus-find-method-for-group group))
 355         (func 'request-group-description))
 356     (when (gnus-check-backend-function func group)
 357       (funcall (gnus-get-function gnus-command-method func)
 358                (gnus-group-real-name group) (nth 1 gnus-command-method)))))
 359
 360 (defun gnus-request-group-articles (group)
 361   "Request a list of existing articles in GROUP."
 362   (let ((gnus-command-method (gnus-find-method-for-group group))
 363         (func 'request-group-articles))
 364     (when (gnus-check-backend-function func group)
 365       (funcall (gnus-get-function gnus-command-method func)
 366                (gnus-group-real-name group) (nth 1 gnus-command-method)))))
 367
 368 (defun gnus-close-group (group)
 369   "Request the GROUP be closed."
 370   (let ((gnus-command-method (inline (gnus-find-method-for-group group))))
 371     (funcall (gnus-get-function gnus-command-method 'close-group)
 372              (gnus-group-real-name group) (nth 1 gnus-command-method))))
 373
 374 (defun gnus-retrieve-headers (articles group &optional fetch-old)
 375   "Request headers for ARTICLES in GROUP.
 376 If FETCH-OLD, retrieve all headers (or some subset thereof) in the group."
 377   (let ((gnus-command-method (gnus-find-method-for-group group)))
 378     (cond
 379      ((and gnus-use-cache (numberp (car articles)))
 380       (gnus-cache-retrieve-headers articles group fetch-old))
 381      ((and gnus-agent (gnus-online gnus-command-method)
 382            (gnus-agent-method-p gnus-command-method))
 383       (gnus-agent-retrieve-headers articles group fetch-old))
 384      (t
 385       (funcall (gnus-get-function gnus-command-method 'retrieve-headers)
 386                articles (gnus-group-real-name group)
 387                (nth 1 gnus-command-method) fetch-old)))))
 388
 389 (defun gnus-retrieve-articles (articles group)
 390   "Request ARTICLES in GROUP."
 391   (let ((gnus-command-method (gnus-find-method-for-group group)))
 392     (funcall (gnus-get-function gnus-command-method 'retrieve-articles)
 393              articles (gnus-group-real-name group)
 394              (nth 1 gnus-command-method))))
 395
 396 (defun gnus-retrieve-groups (groups gnus-command-method)
 397   "Request active information on GROUPS from GNUS-COMMAND-METHOD."
 398   (when (stringp gnus-command-method)
 399     (setq gnus-command-method (gnus-server-to-method gnus-command-method)))
 400   (funcall (gnus-get-function gnus-command-method 'retrieve-groups)
 401            groups (nth 1 gnus-command-method)))
 402
 403 (defun gnus-request-type (group &optional article)
 404   "Return the type (`post' or `mail') of GROUP (and ARTICLE)."
 405   (let ((gnus-command-method (gnus-find-method-for-group group)))
 406     (if (not (gnus-check-backend-function
 407               'request-type (car gnus-command-method)))
 408         'unknown
 409       (funcall (gnus-get-function gnus-command-method 'request-type)
 410                (gnus-group-real-name group) article))))
 411
 412 (defun gnus-request-set-mark (group action)
 413   "Set marks on articles in the back end."
 414   (let ((gnus-command-method (gnus-find-method-for-group group)))
 415     (if (not (gnus-check-backend-function
 416               'request-set-mark (car gnus-command-method)))
 417         action
 418       (funcall (gnus-get-function gnus-command-method 'request-set-mark)
 419                (gnus-group-real-name group) action
 420                (nth 1 gnus-command-method)))))
 421
 422 (defun gnus-request-update-mark (group article mark)
 423   "Allow the back end to change the mark the user tries to put on an article."
 424   (let ((gnus-command-method (gnus-find-method-for-group group)))
 425     (if (not (gnus-check-backend-function
 426               'request-update-mark (car gnus-command-method)))
 427         mark
 428       (funcall (gnus-get-function gnus-command-method 'request-update-mark)
 429                (gnus-group-real-name group) article mark))))
 430
 431 (defun gnus-request-article (article group &optional buffer)
 432   "Request the ARTICLE in GROUP.
 433 ARTICLE can either be an article number or an article Message-ID.
 434 If BUFFER, insert the article in that group."
 435   (let ((gnus-command-method (gnus-find-method-for-group group)))
 436     (funcall (gnus-get-function gnus-command-method 'request-article)
 437              article (gnus-group-real-name group)
 438              (nth 1 gnus-command-method) buffer)))
 439
 440 (defun gnus-request-head (article group)
 441   "Request the head of ARTICLE in GROUP."
 442   (let* ((gnus-command-method (gnus-find-method-for-group group))
 443          (head (gnus-get-function gnus-command-method 'request-head t))
 444          res clean-up)
 445     (cond
 446      ;; Check the cache.
 447      ((and gnus-use-cache
 448            (numberp article)
 449            (gnus-cache-request-article article group))
 450       (setq res (cons group article)
 451             clean-up t))
 452      ;; Check the agent cache.
 453      ((gnus-agent-request-article article group)
 454       (setq res (cons group article)
 455             clean-up t))
 456      ;; Use `head' function.
 457      ((fboundp head)
 458       (setq res (funcall head article (gnus-group-real-name group)
 459                          (nth 1 gnus-command-method))))
 460      ;; Use `article' function.
 461      (t
 462       (setq res (gnus-request-article article group)
 463             clean-up t)))
 464     (when clean-up
 465       (save-excursion
 466         (set-buffer nntp-server-buffer)
 467         (goto-char (point-min))
 468         (when (search-forward "\n\n" nil t)
 469           (delete-region (1- (point)) (point-max)))
 470         (nnheader-fold-continuation-lines)))
 471     res))
 472
 473 (defun gnus-request-body (article group)
 474   "Request the body of ARTICLE in GROUP."
 475   (let* ((gnus-command-method (gnus-find-method-for-group group))
 476          (head (gnus-get-function gnus-command-method 'request-body t))
 477          res clean-up)
 478     (cond
 479      ;; Check the cache.
 480      ((and gnus-use-cache
 481            (numberp article)
 482            (gnus-cache-request-article article group))
 483       (setq res (cons group article)
 484             clean-up t))
 485      ;; Check the agent cache.
 486      ((gnus-agent-request-article article group)
 487       (setq res (cons group article)
 488             clean-up t))
 489      ;; Use `head' function.
 490      ((fboundp head)
 491       (setq res (funcall head article (gnus-group-real-name group)
 492                          (nth 1 gnus-command-method))))
 493      ;; Use `article' function.
 494      (t
 495       (setq res (gnus-request-article article group)
 496             clean-up t)))
 497     (when clean-up
 498       (save-excursion
 499         (set-buffer nntp-server-buffer)
 500         (goto-char (point-min))
 501         (when (search-forward "\n\n" nil t)
 502           (delete-region (point-min) (1- (point))))))
 503     res))
 504
 505 (defun gnus-request-post (gnus-command-method)
 506   "Post the current buffer using GNUS-COMMAND-METHOD."
 507   (when (stringp gnus-command-method)
 508     (setq gnus-command-method (gnus-server-to-method gnus-command-method)))
 509   (funcall (gnus-get-function gnus-command-method 'request-post)
 510            (nth 1 gnus-command-method)))
 511
 512 (defun gnus-request-scan (group gnus-command-method)
 513   "Request a SCAN being performed in GROUP from GNUS-COMMAND-METHOD.
 514 If GROUP is nil, all groups on GNUS-COMMAND-METHOD are scanned."
 515   (let ((gnus-command-method
 516          (if group (gnus-find-method-for-group group) gnus-command-method))
 517         (gnus-inhibit-demon t)
 518         (mail-source-plugged gnus-plugged))
 519     (if (or gnus-plugged (not (gnus-agent-method-p gnus-command-method)))
 520         (progn
 521           (setq gnus-internal-registry-spool-current-method gnus-command-method)
 522           (funcall (gnus-get-function gnus-command-method 'request-scan)
 523                    (and group (gnus-group-real-name group))
 524                    (nth 1 gnus-command-method))))))
 525
 526 (defsubst gnus-request-update-info (info gnus-command-method)
 527   "Request that GNUS-COMMAND-METHOD update INFO."
 528   (when (stringp gnus-command-method)
 529     (setq gnus-command-method (gnus-server-to-method gnus-command-method)))
 530   (when (gnus-check-backend-function
 531          'request-update-info (car gnus-command-method))
 532     (let ((group (gnus-info-group info)))
 533       (and (funcall (gnus-get-function gnus-command-method
 534                                        'request-update-info)
 535                     (gnus-group-real-name group)
 536                     info (nth 1 gnus-command-method))
 537            ;; If the minimum article number is greater than 1, then all
 538            ;; smaller article numbers are known not to exist; we'll
 539            ;; artificially add those to the 'read range.
 540            (let* ((active (gnus-active group))
 541                   (min (car active)))
 542              (when (> min 1)
 543                (let* ((range (if (= min 2) 1 (cons 1 (1- min))))
 544                       (read (gnus-info-read info))
 545                       (new-read (gnus-range-add read (list range))))
 546                  (gnus-info-set-read info new-read)))
 547              info)))))
 548
 549 (defun gnus-request-expire-articles (articles group &optional force)
 550   (let* ((gnus-command-method (gnus-find-method-for-group group))
 551          (not-deleted
 552           (funcall
 553            (gnus-get-function gnus-command-method 'request-expire-articles)
 554            articles (gnus-group-real-name group) (nth 1 gnus-command-method)
 555            force)))
 556     (when (and gnus-agent
 557                (gnus-agent-method-p gnus-command-method))
 558       (let ((expired-articles (gnus-sorted-difference articles not-deleted)))
 559         (when expired-articles
 560           (gnus-agent-expire expired-articles group 'force))))
 561     not-deleted))
 562
 563 (defun gnus-request-move-article (article group server accept-function
 564                                           &optional last)
 565   (let* ((gnus-command-method (gnus-find-method-for-group group))
 566          (result (funcall (gnus-get-function gnus-command-method
 567                                              'request-move-article)
 568                           article (gnus-group-real-name group)
 569                           (nth 1 gnus-command-method) accept-function last)))
 570     (when (and result gnus-agent
 571                (gnus-agent-method-p gnus-command-method))
 572       (gnus-agent-expire (list article) group 'force))
 573     result))
 574
 575 (defun gnus-request-accept-article (group &optional gnus-command-method last
 576                                           no-encode)
 577   ;; Make sure there's a newline at the end of the article.
 578   (when (stringp gnus-command-method)
 579     (setq gnus-command-method (gnus-server-to-method gnus-command-method)))
 580   (when (and (not gnus-command-method)
 581              (stringp group))
 582     (setq gnus-command-method (gnus-group-name-to-method group)))
 583   (goto-char (point-max))
 584   (unless (bolp)
 585     (insert "\n"))
 586   (unless no-encode
 587     (let ((message-options message-options))
 588       (message-options-set-recipient)
 589       (save-restriction
 590         (message-narrow-to-head)
 591         (let ((mail-parse-charset message-default-charset))
 592           (mail-encode-encoded-word-buffer)))
 593       (message-encode-message-body)))
 594   (let ((gnus-command-method (or gnus-command-method
 595                                  (gnus-find-method-for-group group))))
 596     (funcall (gnus-get-function gnus-command-method 'request-accept-article)
 597              (if (stringp group) (gnus-group-real-name group) group)
 598              (cadr gnus-command-method)
 599              last)))
 600
 601 (defun gnus-request-replace-article (article group buffer &optional no-encode)
 602   (unless no-encode
 603     (let ((message-options message-options))
 604       (message-options-set-recipient)
 605       (save-restriction
 606         (message-narrow-to-head)
 607         (let ((mail-parse-charset message-default-charset))
 608           (mail-encode-encoded-word-buffer)))
 609       (message-encode-message-body)))
 610   (let ((func (car (gnus-group-name-to-method group))))
 611     (funcall (intern (format "%s-request-replace-article" func))
 612              article (gnus-group-real-name group) buffer)))
 613
 614 (defun gnus-request-associate-buffer (group)
 615   (let ((gnus-command-method (gnus-find-method-for-group group)))
 616     (funcall (gnus-get-function gnus-command-method 'request-associate-buffer)
 617              (gnus-group-real-name group))))
 618
 619 (defun gnus-request-restore-buffer (article group)
 620   "Request a new buffer restored to the state of ARTICLE."
 621   (let ((gnus-command-method (gnus-find-method-for-group group)))
 622     (funcall (gnus-get-function gnus-command-method 'request-restore-buffer)
 623              article (gnus-group-real-name group)
 624              (nth 1 gnus-command-method))))
 625
 626 (defun gnus-request-create-group (group &optional gnus-command-method args)
 627   (when (stringp gnus-command-method)
 628     (setq gnus-command-method (gnus-server-to-method gnus-command-method)))
 629   (let ((gnus-command-method
 630          (or gnus-command-method (gnus-find-method-for-group group))))
 631     (funcall (gnus-get-function gnus-command-method 'request-create-group)
 632              (gnus-group-real-name group) (nth 1 gnus-command-method) args)))
 633
 634 (defun gnus-request-delete-group (group &optional force)
 635   (let ((gnus-command-method (gnus-find-method-for-group group)))
 636     (funcall (gnus-get-function gnus-command-method 'request-delete-group)
 637              (gnus-group-real-name group) force (nth 1 gnus-command-method))))
 638
 639 (defun gnus-request-rename-group (group new-name)
 640   (let ((gnus-command-method (gnus-find-method-for-group group)))
 641     (funcall (gnus-get-function gnus-command-method 'request-rename-group)
 642              (gnus-group-real-name group)
 643              (gnus-group-real-name new-name) (nth 1 gnus-command-method))))
 644
 645 (defun gnus-close-backends ()
 646   ;; Send a close request to all backends that support such a request.
 647   (let ((methods gnus-valid-select-methods)
 648         (gnus-inhibit-demon t)
 649         func gnus-command-method)
 650     (while (setq gnus-command-method (pop methods))
 651       (when (fboundp (setq func (intern
 652                                  (concat (car gnus-command-method)
 653                                          "-request-close"))))
 654         (funcall func)))))
 655
 656 (defun gnus-asynchronous-p (gnus-command-method)
 657   (let ((func (gnus-get-function gnus-command-method 'asynchronous-p t)))
 658     (when (fboundp func)
 659       (funcall func))))
 660
 661 (defun gnus-remove-denial (gnus-command-method)
 662   (when (stringp gnus-command-method)
 663     (setq gnus-command-method (gnus-server-to-method gnus-command-method)))
 664   (let* ((elem (assoc gnus-command-method gnus-opened-servers))
 665          (status (cadr elem)))
 666     ;; If this hasn't been opened before, we add it to the list.
 667     (when (eq status 'denied)
 668       ;; Set the status of this server.
 669       (setcar (cdr elem) 'closed))))
 670
 671 (provide 'gnus-int)
 672
 673 ;;; arch-tag: bbc90087-9b7f-4017-a92c-3abf180ac86d
 674 ;;; gnus-int.el ends here