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