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