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

   1 ;;; gnus-int.el --- backend interface functions for Gnus
   2
   3 ;; Copyright (C) 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004
   4 ;;   2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012 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 of the License, or
  14 ;; (at your option) 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.  If not, see <http://www.gnu.org/licenses/>.
  23
  24 ;;; Commentary:
  25
  26 ;;; Code:
  27
  28 (eval-when-compile (require 'cl))
  29
  30 (require 'gnus)
  31 (require 'message)
  32 (require 'gnus-range)
  33
  34 (autoload 'gnus-agent-expire "gnus-agent")
  35 (autoload 'gnus-agent-regenerate-group "gnus-agent")
  36 (autoload 'gnus-agent-read-servers-validate-native "gnus-agent")
  37 (autoload 'gnus-agent-possibly-synchronize-flags-server "gnus-agent")
  38
  39 (defcustom gnus-open-server-hook nil
  40   "Hook called just before opening connection to the news server."
  41   :group 'gnus-start
  42   :type 'hook)
  43
  44 (defcustom gnus-server-unopen-status nil
  45   "The default status if the server is not able to open.
  46 If the server is covered by Gnus agent, the possible values are
  47 `denied', set the server denied; `offline', set the server offline;
  48 nil, ask user.  If the server is not covered by Gnus agent, set the
  49 server denied."
  50   :version "22.1"
  51   :group 'gnus-start
  52   :type '(choice (const :tag "Ask" nil)
  53                  (const :tag "Deny server" denied)
  54                  (const :tag "Unplug Agent" offline)))
  55
  56 (defvar gnus-internal-registry-spool-current-method nil
  57   "The current method, for the registry.")
  58
  59
  60 (defun gnus-server-opened (gnus-command-method)
  61   "Check whether a connection to GNUS-COMMAND-METHOD has been opened."
  62   (unless (eq (gnus-server-status gnus-command-method)
  63               'denied)
  64     (when (stringp gnus-command-method)
  65       (setq gnus-command-method (gnus-server-to-method gnus-command-method)))
  66     (funcall (inline (gnus-get-function gnus-command-method 'server-opened))
  67              (nth 1 gnus-command-method))))
  68
  69 (defun gnus-status-message (gnus-command-method)
  70   "Return the status message from GNUS-COMMAND-METHOD.
  71 If GNUS-COMMAND-METHOD is a string, it is interpreted as a group
  72 name.  The method this group uses will be queried."
  73   (let ((gnus-command-method
  74          (if (stringp gnus-command-method)
  75              (gnus-find-method-for-group gnus-command-method)
  76            gnus-command-method)))
  77     (funcall (gnus-get-function gnus-command-method 'status-message)
  78              (nth 1 gnus-command-method))))
  79
  80 ;;;
  81 ;;; Server Communication
  82 ;;;
  83
  84 (defun gnus-start-news-server (&optional confirm)
  85   "Open a method for getting news.
  86 If CONFIRM is non-nil, the user will be asked for an NNTP server."
  87   (let (how)
  88     (if gnus-current-select-method
  89         ;; Stream is already opened.
  90         nil
  91       ;; Open NNTP server.
  92       (unless gnus-nntp-service
  93         (setq gnus-nntp-server nil))
  94       (when confirm
  95         ;; Read server name with completion.
  96         (setq gnus-nntp-server
  97               (completing-read "NNTP server: "
  98                                (mapcar 'list
  99                                        (cons (list gnus-nntp-server)
 100                                              gnus-secondary-servers))
 101                                nil nil gnus-nntp-server)))
 102
 103       (when (and gnus-nntp-server
 104                  (stringp gnus-nntp-server)
 105                  (not (string= gnus-nntp-server "")))
 106         (setq gnus-select-method
 107               (cond ((or (string= gnus-nntp-server "")
 108                          (string= gnus-nntp-server "::"))
 109                      (list 'nnspool (system-name)))
 110                     ((string-match "^:" gnus-nntp-server)
 111                      (list 'nnmh gnus-nntp-server
 112                            (list 'nnmh-directory
 113                                  (file-name-as-directory
 114                                   (expand-file-name
 115                                    (substring gnus-nntp-server 1) "~/")))
 116                            (list 'nnmh-get-new-mail nil)))
 117                     (t
 118                      (list 'nntp gnus-nntp-server)))))
 119
 120       (setq how (car gnus-select-method))
 121       (cond
 122        ((eq how 'nnspool)
 123         (require 'nnspool)
 124         (gnus-message 5 "Looking up local news spool..."))
 125        ((eq how 'nnmh)
 126         (require 'nnmh)
 127         (gnus-message 5 "Looking up mh spool..."))
 128        (t
 129         (require 'nntp)))
 130       (setq gnus-current-select-method gnus-select-method)
 131       (gnus-run-hooks 'gnus-open-server-hook)
 132
 133       ;; Partially validate agent covered methods now that the
 134       ;; gnus-select-method is known.
 135
 136       (if gnus-agent
 137           ;; NOTE: This is here for one purpose only.  By validating
 138           ;; the current select method, it converts the old 5.10.3,
 139           ;; and earlier, format to the current format.  That enables
 140           ;; the agent code within gnus-open-server to function
 141           ;; correctly.
 142           (gnus-agent-read-servers-validate-native gnus-select-method))
 143
 144       (or
 145        ;; gnus-open-server-hook might have opened it
 146        (gnus-server-opened gnus-select-method)
 147        (gnus-open-server gnus-select-method)
 148        gnus-batch-mode
 149        (gnus-y-or-n-p
 150         (format
 151          "%s (%s) open error: '%s'.  Continue? "
 152          (car gnus-select-method) (cadr gnus-select-method)
 153          (gnus-status-message gnus-select-method)))
 154        (gnus-error 1 "Couldn't open server on %s"
 155                    (nth 1 gnus-select-method))))))
 156
 157 (defun gnus-check-group (group)
 158   "Try to make sure that the server where GROUP exists is alive."
 159   (let ((method (gnus-find-method-for-group group)))
 160     (or (gnus-server-opened method)
 161         (gnus-open-server method))))
 162
 163 (defun gnus-check-server (&optional method silent)
 164   "Check whether the connection to METHOD is down.
 165 If METHOD is nil, use `gnus-select-method'.
 166 If it is down, start it up (again)."
 167   (let ((method (or method gnus-select-method))
 168         result)
 169     ;; Transform virtual server names into select methods.
 170     (when (stringp method)
 171       (setq method (gnus-server-to-method method)))
 172     (if (gnus-server-opened method)
 173         ;; The stream is already opened.
 174         t
 175       ;; Open the server.
 176       (unless silent
 177         (gnus-message 5 "Opening %s server%s..." (car method)
 178                       (if (equal (nth 1 method) "") ""
 179                         (format " on %s" (nth 1 method)))))
 180       (gnus-run-hooks 'gnus-open-server-hook)
 181       (prog1
 182           (condition-case ()
 183               (setq result (gnus-open-server method))
 184             (quit (message "Quit gnus-check-server")
 185                   nil))
 186         (unless silent
 187           (gnus-message 5 "Opening %s server%s...%s" (car method)
 188                         (if (equal (nth 1 method) "") ""
 189                           (format " on %s" (nth 1 method)))
 190                         (if result "done" "failed")))))))
 191
 192 (defun gnus-get-function (method function &optional noerror)
 193   "Return a function symbol based on METHOD and FUNCTION."
 194   ;; Translate server names into methods.
 195   (unless method
 196     (error "Attempted use of a nil select method"))
 197   (when (stringp method)
 198     (setq method (gnus-server-to-method method)))
 199   ;; Check cache of constructed names.
 200   (let* ((method-sym (if gnus-agent
 201                          (inline (gnus-agent-get-function method))
 202                        (car method)))
 203          (method-fns (get method-sym 'gnus-method-functions))
 204          (func (let ((method-fnlist-elt (assq function method-fns)))
 205                  (unless method-fnlist-elt
 206                    (setq method-fnlist-elt
 207                          (cons function
 208                                (intern (format "%s-%s" method-sym function))))
 209                    (put method-sym 'gnus-method-functions
 210                         (cons method-fnlist-elt method-fns)))
 211                  (cdr method-fnlist-elt))))
 212     ;; Maybe complain if there is no function.
 213     (unless (fboundp func)
 214       (unless (car method)
 215         (error "Trying to require a method that doesn't exist"))
 216       (require (car method))
 217       (when (not (fboundp func))
 218         (if noerror
 219             (setq func nil)
 220           (error "No such function: %s" func))))
 221     func))
 222
 223 \f
 224 ;;;
 225 ;;; Interface functions to the backends.
 226 ;;;
 227
 228 (defun gnus-open-server (gnus-command-method)
 229   "Open a connection to GNUS-COMMAND-METHOD."
 230   (when (stringp gnus-command-method)
 231     (setq gnus-command-method (gnus-server-to-method gnus-command-method)))
 232   (let ((elem (assoc gnus-command-method gnus-opened-servers))
 233         (server (gnus-method-to-server-name gnus-command-method)))
 234     ;; If this method was previously denied, we just return nil.
 235     (if (eq (nth 1 elem) 'denied)
 236         (progn
 237           (gnus-message 1 "Denied server %s" server)
 238           nil)
 239       ;; Open the server.
 240       (let* ((open-server-function (gnus-get-function gnus-command-method 'open-server))
 241              (result
 242              (condition-case err
 243                  (funcall open-server-function
 244                           (nth 1 gnus-command-method)
 245                           (nthcdr 2 gnus-command-method))
 246                (error
 247                 (gnus-message 1 (format
 248                                  "Unable to open server %s due to: %s"
 249                                  server (error-message-string err)))
 250                 nil)
 251                (quit
 252                 (gnus-message 1 "Quit trying to open server %s" server)
 253                 nil)))
 254             open-offline)
 255         ;; If this hasn't been opened before, we add it to the list.
 256         (unless elem
 257           (setq elem (list gnus-command-method nil)
 258                 gnus-opened-servers (cons elem gnus-opened-servers)))
 259         ;; Set the status of this server.
 260         (setcar (cdr elem)
 261                 (cond (result
 262                        (if (eq open-server-function #'nnagent-open-server)
 263                            ;; The agent's backend has a "special" status
 264                            'offline
 265                          'ok))
 266                       ((and gnus-agent
 267                             (gnus-agent-method-p gnus-command-method))
 268                        (cond (gnus-server-unopen-status
 269                               ;; Set the server's status to the unopen
 270                               ;; status.  If that status is offline,
 271                               ;; recurse to open the agent's backend.
 272                               (setq open-offline (eq gnus-server-unopen-status 'offline))
 273                               gnus-server-unopen-status)
 274                              ((and
 275                                (not gnus-batch-mode)
 276                                (gnus-y-or-n-p
 277                                 (format
 278                                  "Unable to open server %s, go offline? "
 279                                  server)))
 280                               (setq open-offline t)
 281                               'offline)
 282                              (t
 283                               ;; This agentized server was still denied
 284                               'denied)))
 285                       (t
 286                        ;; This unagentized server must be denied
 287                        'denied)))
 288
 289         ;; NOTE: I MUST set the server's status to offline before this
 290         ;; recursive call as this status will drive the
 291         ;; gnus-get-function (called above) to return the agent's
 292         ;; backend.
 293         (if open-offline
 294             ;; Recursively open this offline server to perform the
 295             ;; open-server function of the agent's backend.
 296             (let ((gnus-server-unopen-status 'denied))
 297               ;; Bind gnus-server-unopen-status to avoid recursively
 298               ;; prompting with "go offline?".  This is only a concern
 299               ;; when the agent's backend fails to open the server.
 300               (gnus-open-server gnus-command-method))
 301           (when (and (eq (cadr elem) 'ok) gnus-agent
 302                      (gnus-agent-method-p gnus-command-method))
 303             (save-excursion
 304               (gnus-agent-possibly-synchronize-flags-server
 305                gnus-command-method)))
 306           result)))))
 307
 308 (defun gnus-close-server (gnus-command-method)
 309   "Close the connection to GNUS-COMMAND-METHOD."
 310   (when (stringp gnus-command-method)
 311     (setq gnus-command-method (gnus-server-to-method gnus-command-method)))
 312   (funcall (gnus-get-function gnus-command-method 'close-server)
 313            (nth 1 gnus-command-method)))
 314
 315 (defun gnus-request-list (gnus-command-method)
 316   "Request the active file from GNUS-COMMAND-METHOD."
 317   (when (stringp gnus-command-method)
 318     (setq gnus-command-method (gnus-server-to-method gnus-command-method)))
 319   (funcall (gnus-get-function gnus-command-method 'request-list)
 320            (nth 1 gnus-command-method)))
 321
 322 (defun gnus-request-list-newsgroups (gnus-command-method)
 323   "Request the newsgroups file from GNUS-COMMAND-METHOD."
 324   (when (stringp gnus-command-method)
 325     (setq gnus-command-method (gnus-server-to-method gnus-command-method)))
 326   (funcall (gnus-get-function gnus-command-method 'request-list-newsgroups)
 327            (nth 1 gnus-command-method)))
 328
 329 (defun gnus-request-newgroups (date gnus-command-method)
 330   "Request all new groups since DATE from GNUS-COMMAND-METHOD."
 331   (when (stringp gnus-command-method)
 332     (setq gnus-command-method (gnus-server-to-method gnus-command-method)))
 333   (let ((func (gnus-get-function gnus-command-method 'request-newgroups t)))
 334     (when func
 335       (funcall func date (nth 1 gnus-command-method)))))
 336
 337 (defun gnus-request-regenerate (gnus-command-method)
 338   "Request a data generation from GNUS-COMMAND-METHOD."
 339   (when (stringp gnus-command-method)
 340     (setq gnus-command-method (gnus-server-to-method gnus-command-method)))
 341   (funcall (gnus-get-function gnus-command-method 'request-regenerate)
 342            (nth 1 gnus-command-method)))
 343
 344 (defun gnus-request-compact-group (group)
 345   (let* ((method (gnus-find-method-for-group group))
 346          (gnus-command-method method)
 347          (result
 348           (funcall (gnus-get-function gnus-command-method
 349                                       'request-compact-group)
 350                    (gnus-group-real-name group)
 351                    (nth 1 gnus-command-method) t)))
 352     result))
 353
 354 (defun gnus-request-compact (gnus-command-method)
 355   "Request groups compaction  from GNUS-COMMAND-METHOD."
 356   (when (stringp gnus-command-method)
 357     (setq gnus-command-method (gnus-server-to-method gnus-command-method)))
 358   (funcall (gnus-get-function gnus-command-method 'request-compact)
 359            (nth 1 gnus-command-method)))
 360
 361 (defun gnus-request-group (group &optional dont-check gnus-command-method)
 362   "Request GROUP.  If DONT-CHECK, no information is required."
 363   (let ((gnus-command-method
 364          (or gnus-command-method (inline (gnus-find-method-for-group group)))))
 365     (when (stringp gnus-command-method)
 366       (setq gnus-command-method
 367             (inline (gnus-server-to-method gnus-command-method))))
 368          (funcall (inline (gnus-get-function gnus-command-method 'request-group))
 369              (gnus-group-real-name group) (nth 1 gnus-command-method)
 370              dont-check)))
 371
 372 (defun gnus-list-active-group (group)
 373   "Request active information on GROUP."
 374   (let ((gnus-command-method (gnus-find-method-for-group group))
 375         (func 'list-active-group))
 376     (when (gnus-check-backend-function func group)
 377       (funcall (gnus-get-function gnus-command-method func)
 378                (gnus-group-real-name group) (nth 1 gnus-command-method)))))
 379
 380 (defun gnus-request-group-description (group)
 381   "Request a description of GROUP."
 382   (let ((gnus-command-method (gnus-find-method-for-group group))
 383         (func 'request-group-description))
 384     (when (gnus-check-backend-function func group)
 385       (funcall (gnus-get-function gnus-command-method func)
 386                (gnus-group-real-name group) (nth 1 gnus-command-method)))))
 387
 388 (defun gnus-request-group-articles (group)
 389   "Request a list of existing articles in GROUP."
 390   (let ((gnus-command-method (gnus-find-method-for-group group))
 391         (func 'request-group-articles))
 392     (when (gnus-check-backend-function func group)
 393       (funcall (gnus-get-function gnus-command-method func)
 394                (gnus-group-real-name group) (nth 1 gnus-command-method)))))
 395
 396 (defun gnus-close-group (group)
 397   "Request the GROUP be closed."
 398   (let ((gnus-command-method (inline (gnus-find-method-for-group group))))
 399     (funcall (gnus-get-function gnus-command-method 'close-group)
 400              (gnus-group-real-name group) (nth 1 gnus-command-method))))
 401
 402 (defun gnus-retrieve-headers (articles group &optional fetch-old)
 403   "Request headers for ARTICLES in GROUP.
 404 If FETCH-OLD, retrieve all headers (or some subset thereof) in the group."
 405   (let ((gnus-command-method (gnus-find-method-for-group group)))
 406     (cond
 407      ((and gnus-use-cache (numberp (car articles)))
 408       (gnus-cache-retrieve-headers articles group fetch-old))
 409      ((and gnus-agent (gnus-online gnus-command-method)
 410            (gnus-agent-method-p gnus-command-method))
 411       (gnus-agent-retrieve-headers articles group fetch-old))
 412      (t
 413       (funcall (gnus-get-function gnus-command-method 'retrieve-headers)
 414                articles (gnus-group-real-name group)
 415                (nth 1 gnus-command-method) fetch-old)))))
 416
 417 (defun gnus-retrieve-articles (articles group)
 418   "Request ARTICLES in GROUP."
 419   (let ((gnus-command-method (gnus-find-method-for-group group)))
 420     (funcall (gnus-get-function gnus-command-method 'retrieve-articles)
 421              articles (gnus-group-real-name group)
 422              (nth 1 gnus-command-method))))
 423
 424 (defun gnus-retrieve-groups (groups gnus-command-method)
 425   "Request active information on GROUPS from GNUS-COMMAND-METHOD."
 426   (when (stringp gnus-command-method)
 427     (setq gnus-command-method (gnus-server-to-method gnus-command-method)))
 428   (funcall (gnus-get-function gnus-command-method 'retrieve-groups)
 429            groups (nth 1 gnus-command-method)))
 430
 431 (defun gnus-request-type (group &optional article)
 432   "Return the type (`post' or `mail') of GROUP (and ARTICLE)."
 433   (let ((gnus-command-method (gnus-find-method-for-group group)))
 434     (if (not (gnus-check-backend-function
 435               'request-type (car gnus-command-method)))
 436         'unknown
 437       (funcall (gnus-get-function gnus-command-method 'request-type)
 438                (gnus-group-real-name group) article))))
 439
 440 (defun gnus-request-set-mark (group action)
 441   "Set marks on articles in the back end."
 442   (let ((gnus-command-method (gnus-find-method-for-group group)))
 443     (if (not (gnus-check-backend-function
 444               'request-set-mark (car gnus-command-method)))
 445         action
 446       (funcall (gnus-get-function gnus-command-method 'request-set-mark)
 447                (gnus-group-real-name group) action
 448                (nth 1 gnus-command-method)))))
 449
 450 (defun gnus-request-update-mark (group article mark)
 451   "Allow the back end to change the mark the user tries to put on an article."
 452   (let ((gnus-command-method (gnus-find-method-for-group group)))
 453     (if (not (gnus-check-backend-function
 454               'request-update-mark (car gnus-command-method)))
 455         mark
 456       (funcall (gnus-get-function gnus-command-method 'request-update-mark)
 457                (gnus-group-real-name group) article mark))))
 458
 459 (defun gnus-request-article (article group &optional buffer)
 460   "Request the ARTICLE in GROUP.
 461 ARTICLE can either be an article number or an article Message-ID.
 462 If BUFFER, insert the article in that group."
 463   (let ((gnus-command-method (gnus-find-method-for-group group)))
 464     (funcall (gnus-get-function gnus-command-method 'request-article)
 465              article (gnus-group-real-name group)
 466              (nth 1 gnus-command-method) buffer)))
 467
 468 (defun gnus-request-head (article group)
 469   "Request the head of ARTICLE in GROUP."
 470   (let* ((gnus-command-method (gnus-find-method-for-group group))
 471          (head (gnus-get-function gnus-command-method 'request-head t))
 472          res clean-up)
 473     (cond
 474      ;; Check the cache.
 475      ((and gnus-use-cache
 476            (numberp article)
 477            (gnus-cache-request-article article group))
 478       (setq res (cons group article)
 479             clean-up t))
 480      ;; Check the agent cache.
 481      ((gnus-agent-request-article article group)
 482       (setq res (cons group article)
 483             clean-up t))
 484      ;; Use `head' function.
 485      ((fboundp head)
 486       (setq res (funcall head article (gnus-group-real-name group)
 487                          (nth 1 gnus-command-method))))
 488      ;; Use `article' function.
 489      (t
 490       (setq res (gnus-request-article article group)
 491             clean-up t)))
 492     (when clean-up
 493       (save-excursion
 494         (set-buffer nntp-server-buffer)
 495         (goto-char (point-min))
 496         (when (search-forward "\n\n" nil t)
 497           (delete-region (1- (point)) (point-max)))
 498         (nnheader-fold-continuation-lines)))
 499     res))
 500
 501 (defun gnus-request-body (article group)
 502   "Request the body of ARTICLE in GROUP."
 503   (let* ((gnus-command-method (gnus-find-method-for-group group))
 504          (head (gnus-get-function gnus-command-method 'request-body t))
 505          res clean-up)
 506     (cond
 507      ;; Check the cache.
 508      ((and gnus-use-cache
 509            (numberp article)
 510            (gnus-cache-request-article article group))
 511       (setq res (cons group article)
 512             clean-up t))
 513      ;; Check the agent cache.
 514      ((gnus-agent-request-article article group)
 515       (setq res (cons group article)
 516             clean-up t))
 517      ;; Use `head' function.
 518      ((fboundp head)
 519       (setq res (funcall head article (gnus-group-real-name group)
 520                          (nth 1 gnus-command-method))))
 521      ;; Use `article' function.
 522      (t
 523       (setq res (gnus-request-article article group)
 524             clean-up t)))
 525     (when clean-up
 526       (save-excursion
 527         (set-buffer nntp-server-buffer)
 528         (goto-char (point-min))
 529         (when (search-forward "\n\n" nil t)
 530           (delete-region (point-min) (1- (point))))))
 531     res))
 532
 533 (defun gnus-request-post (gnus-command-method)
 534   "Post the current buffer using GNUS-COMMAND-METHOD."
 535   (when (stringp gnus-command-method)
 536     (setq gnus-command-method (gnus-server-to-method gnus-command-method)))
 537   (funcall (gnus-get-function gnus-command-method 'request-post)
 538            (nth 1 gnus-command-method)))
 539
 540 (defun gnus-request-scan (group gnus-command-method)
 541   "Request a SCAN being performed in GROUP from GNUS-COMMAND-METHOD.
 542 If GROUP is nil, all groups on GNUS-COMMAND-METHOD are scanned."
 543   (let ((gnus-command-method
 544          (if group (gnus-find-method-for-group group) gnus-command-method))
 545         (gnus-inhibit-demon t)
 546         (mail-source-plugged gnus-plugged))
 547     (when (or gnus-plugged (not (gnus-agent-method-p gnus-command-method)))
 548       (setq gnus-internal-registry-spool-current-method gnus-command-method)
 549       (funcall (gnus-get-function gnus-command-method 'request-scan)
 550                (and group (gnus-group-real-name group))
 551                (nth 1 gnus-command-method)))))
 552
 553 (defsubst gnus-request-update-info (info gnus-command-method)
 554   "Request that GNUS-COMMAND-METHOD update INFO."
 555   (when (stringp gnus-command-method)
 556     (setq gnus-command-method (gnus-server-to-method gnus-command-method)))
 557   (when (gnus-check-backend-function
 558          'request-update-info (car gnus-command-method))
 559     (let ((group (gnus-info-group info)))
 560       (and (funcall (gnus-get-function gnus-command-method
 561                                        'request-update-info)
 562                     (gnus-group-real-name group)
 563                     info (nth 1 gnus-command-method))
 564            ;; If the minimum article number is greater than 1, then all
 565            ;; smaller article numbers are known not to exist; we'll
 566            ;; artificially add those to the 'read range.
 567            (let* ((active (gnus-active group))
 568                   (min (car active)))
 569              (when (> min 1)
 570                (let* ((range (if (= min 2) 1 (cons 1 (1- min))))
 571                       (read (gnus-info-read info))
 572                       (new-read (gnus-range-add read (list range))))
 573                  (gnus-info-set-read info new-read)))
 574              info)))))
 575
 576 (defun gnus-request-expire-articles (articles group &optional force)
 577   (let* ((gnus-command-method (gnus-find-method-for-group group))
 578          (not-deleted
 579           (funcall
 580            (gnus-get-function gnus-command-method 'request-expire-articles)
 581            articles (gnus-group-real-name group) (nth 1 gnus-command-method)
 582            force)))
 583     (when (and gnus-agent
 584                (gnus-agent-method-p gnus-command-method))
 585       (let ((expired-articles (gnus-sorted-difference articles not-deleted)))
 586         (when expired-articles
 587           (gnus-agent-expire expired-articles group 'force))))
 588     not-deleted))
 589
 590 (defun gnus-request-move-article (article group server accept-function
 591                                           &optional last move-is-internal)
 592   (let* ((gnus-command-method (gnus-find-method-for-group group))
 593          (result (funcall (gnus-get-function gnus-command-method
 594                                              'request-move-article)
 595                           article (gnus-group-real-name group)
 596                           (nth 1 gnus-command-method) accept-function last move-is-internal)))
 597     (when (and result gnus-agent
 598                (gnus-agent-method-p gnus-command-method))
 599       (gnus-agent-unfetch-articles group (list article)))
 600     result))
 601
 602 (defun gnus-request-accept-article (group &optional gnus-command-method last
 603                                           no-encode)
 604   ;; Make sure there's a newline at the end of the article.
 605   (when (stringp gnus-command-method)
 606     (setq gnus-command-method (gnus-server-to-method gnus-command-method)))
 607   (when (and (not gnus-command-method)
 608              (stringp group))
 609     (setq gnus-command-method (or (gnus-find-method-for-group group)
 610                                   (gnus-group-name-to-method group))))
 611   (goto-char (point-max))
 612   (unless (bolp)
 613     (insert "\n"))
 614   (unless no-encode
 615     (let ((message-options message-options))
 616       (message-options-set-recipient)
 617       (save-restriction
 618         (message-narrow-to-head)
 619         (let ((mail-parse-charset message-default-charset))
 620           (mail-encode-encoded-word-buffer)))
 621       (message-encode-message-body)))
 622   (let ((gnus-command-method (or gnus-command-method
 623                                  (gnus-find-method-for-group group)))
 624         (result
 625          (funcall
 626           (gnus-get-function gnus-command-method 'request-accept-article)
 627           (if (stringp group) (gnus-group-real-name group) group)
 628           (cadr gnus-command-method)
 629           last)))
 630     (when (and gnus-agent (gnus-agent-method-p gnus-command-method))
 631       (gnus-agent-regenerate-group group (list (cdr result))))
 632     result))
 633
 634 (defun gnus-request-replace-article (article group buffer &optional no-encode)
 635   (unless no-encode
 636     (let ((message-options message-options))
 637       (message-options-set-recipient)
 638       (save-restriction
 639         (message-narrow-to-head)
 640         (let ((mail-parse-charset message-default-charset))
 641           (mail-encode-encoded-word-buffer)))
 642       (message-encode-message-body)))
 643   (let* ((func (car (gnus-group-name-to-method group)))
 644          (result (funcall (intern (format "%s-request-replace-article" func))
 645                           article (gnus-group-real-name group) buffer)))
 646     (when (and gnus-agent (gnus-agent-method-p gnus-command-method))
 647       (gnus-agent-regenerate-group group (list article)))
 648     result))
 649
 650 (defun gnus-request-associate-buffer (group)
 651   (let ((gnus-command-method (gnus-find-method-for-group group)))
 652     (funcall (gnus-get-function gnus-command-method 'request-associate-buffer)
 653              (gnus-group-real-name group))))
 654
 655 (defun gnus-request-restore-buffer (article group)
 656   "Request a new buffer restored to the state of ARTICLE."
 657   (let ((gnus-command-method (gnus-find-method-for-group group)))
 658     (funcall (gnus-get-function gnus-command-method 'request-restore-buffer)
 659              article (gnus-group-real-name group)
 660              (nth 1 gnus-command-method))))
 661
 662 (defun gnus-request-create-group (group &optional gnus-command-method args)
 663   (when (stringp gnus-command-method)
 664     (setq gnus-command-method (gnus-server-to-method gnus-command-method)))
 665   (let ((gnus-command-method
 666          (or gnus-command-method (gnus-find-method-for-group group))))
 667     (funcall (gnus-get-function gnus-command-method 'request-create-group)
 668              (gnus-group-real-name group) (nth 1 gnus-command-method) args)))
 669
 670 (defun gnus-request-delete-group (group &optional force)
 671   (let* ((gnus-command-method (gnus-find-method-for-group group))
 672          (result
 673           (funcall (gnus-get-function gnus-command-method 'request-delete-group)
 674                    (gnus-group-real-name group) force (nth 1 gnus-command-method))))
 675     (when result
 676       (gnus-cache-delete-group group)
 677       (gnus-agent-delete-group group))
 678     result))
 679
 680 (defun gnus-request-rename-group (group new-name)
 681   (let* ((gnus-command-method (gnus-find-method-for-group group))
 682          (result
 683           (funcall (gnus-get-function gnus-command-method 'request-rename-group)
 684                    (gnus-group-real-name group)
 685                    (gnus-group-real-name new-name) (nth 1 gnus-command-method))))
 686     (when result
 687       (gnus-cache-rename-group group new-name)
 688       (gnus-agent-rename-group group new-name))
 689     result))
 690
 691 (defun gnus-close-backends ()
 692   ;; Send a close request to all backends that support such a request.
 693   (let ((methods gnus-valid-select-methods)
 694         (gnus-inhibit-demon t)
 695         func gnus-command-method)
 696     (while (setq gnus-command-method (pop methods))
 697       (when (fboundp (setq func (intern
 698                                  (concat (car gnus-command-method)
 699                                          "-request-close"))))
 700         (funcall func)))))
 701
 702 (defun gnus-asynchronous-p (gnus-command-method)
 703   (let ((func (gnus-get-function gnus-command-method 'asynchronous-p t)))
 704     (when (fboundp func)
 705       (funcall func))))
 706
 707 (defun gnus-remove-denial (gnus-command-method)
 708   (when (stringp gnus-command-method)
 709     (setq gnus-command-method (gnus-server-to-method gnus-command-method)))
 710   (let* ((elem (assoc gnus-command-method gnus-opened-servers))
 711          (status (cadr elem)))
 712     ;; If this hasn't been opened before, we add it to the list.
 713     (when (eq status 'denied)
 714       ;; Set the status of this server.
 715       (setcar (cdr elem) 'closed))))
 716
 717 (provide 'gnus-int)
 718
 719 ;; arch-tag: bbc90087-9b7f-4017-a92c-3abf180ac86d
 720 ;;; gnus-int.el ends here