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 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-run-hook-with-args "gnus-util")
  35 (autoload 'gnus-agent-expire "gnus-agent")
  36 (autoload 'gnus-agent-regenerate-group "gnus-agent")
  37 (autoload 'gnus-agent-read-servers-validate-native "gnus-agent")
  38 (autoload 'gnus-agent-possibly-synchronize-flags-server "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-after-set-mark-hook nil
  46   "Hook called just after marks are set in a group."
  47   :group 'gnus-start
  48   :type 'hook)
  49
  50 (defcustom gnus-before-update-mark-hook nil
  51   "Hook called just before marks are updated in a group."
  52   :group 'gnus-start
  53   :type 'hook)
  54
  55 (defcustom gnus-server-unopen-status nil
  56   "The default status if the server is not able to open.
  57 If the server is covered by Gnus agent, the possible values are
  58 `denied', set the server denied; `offline', set the server offline;
  59 nil, ask user.  If the server is not covered by Gnus agent, set the
  60 server denied."
  61   :version "22.1"
  62   :group 'gnus-start
  63   :type '(choice (const :tag "Ask" nil)
  64                  (const :tag "Deny server" denied)
  65                  (const :tag "Unplug Agent" offline)))
  66
  67 (defvar gnus-internal-registry-spool-current-method nil
  68   "The current method, for the registry.")
  69
  70
  71 (defun gnus-server-opened (gnus-command-method)
  72   "Check whether a connection to GNUS-COMMAND-METHOD has been opened."
  73   (unless (eq (gnus-server-status gnus-command-method)
  74               'denied)
  75     (when (stringp gnus-command-method)
  76       (setq gnus-command-method (gnus-server-to-method gnus-command-method)))
  77     (funcall (inline (gnus-get-function gnus-command-method 'server-opened))
  78              (nth 1 gnus-command-method))))
  79
  80 (defun gnus-status-message (gnus-command-method)
  81   "Return the status message from GNUS-COMMAND-METHOD.
  82 If GNUS-COMMAND-METHOD is a string, it is interpreted as a group
  83 name.  The method this group uses will be queried."
  84   (let ((gnus-command-method
  85          (if (stringp gnus-command-method)
  86              (gnus-find-method-for-group gnus-command-method)
  87            gnus-command-method)))
  88     (funcall (gnus-get-function gnus-command-method 'status-message)
  89              (nth 1 gnus-command-method))))
  90
  91 ;;;
  92 ;;; Server Communication
  93 ;;;
  94
  95 (defun gnus-start-news-server (&optional confirm)
  96   "Open a method for getting news.
  97 If CONFIRM is non-nil, the user will be asked for an NNTP server."
  98   (let (how)
  99     (if gnus-current-select-method
 100         ;; Stream is already opened.
 101         nil
 102       ;; Open NNTP server.
 103       (when confirm
 104         ;; Read server name with completion.
 105         (setq gnus-nntp-server
 106               (gnus-completing-read "NNTP server"
 107                                     (cons gnus-nntp-server
 108                                           gnus-secondary-servers)
 109                                     nil gnus-nntp-server)))
 110
 111       (when (and gnus-nntp-server
 112                  (stringp gnus-nntp-server)
 113                  (not (string= gnus-nntp-server "")))
 114         (setq gnus-select-method
 115               (cond ((or (string= gnus-nntp-server "")
 116                          (string= gnus-nntp-server "::"))
 117                      (list 'nnspool (system-name)))
 118                     ((string-match "^:" gnus-nntp-server)
 119                      (list 'nnmh gnus-nntp-server
 120                            (list 'nnmh-directory
 121                                  (file-name-as-directory
 122                                   (expand-file-name
 123                                    (substring gnus-nntp-server 1) "~/")))
 124                            (list 'nnmh-get-new-mail nil)))
 125                     (t
 126                      (list 'nntp gnus-nntp-server)))))
 127
 128       (setq how (car gnus-select-method))
 129       (cond
 130        ((eq how 'nnspool)
 131         (require 'nnspool)
 132         (gnus-message 5 "Looking up local news spool..."))
 133        ((eq how 'nnmh)
 134         (require 'nnmh)
 135         (gnus-message 5 "Looking up mh spool..."))
 136        (t
 137         (require 'nntp)))
 138       (setq gnus-current-select-method gnus-select-method)
 139       (gnus-run-hooks 'gnus-open-server-hook)
 140
 141       ;; Partially validate agent covered methods now that the
 142       ;; gnus-select-method is known.
 143
 144       (if gnus-agent
 145           ;; NOTE: This is here for one purpose only.  By validating
 146           ;; the current select method, it converts the old 5.10.3,
 147           ;; and earlier, format to the current format.  That enables
 148           ;; the agent code within gnus-open-server to function
 149           ;; correctly.
 150           (gnus-agent-read-servers-validate-native gnus-select-method))
 151
 152       (or
 153        ;; gnus-open-server-hook might have opened it
 154        (gnus-server-opened gnus-select-method)
 155        (gnus-open-server gnus-select-method)
 156        gnus-batch-mode
 157        (gnus-y-or-n-p
 158         (format
 159          "%s (%s) open error: '%s'.  Continue? "
 160          (car gnus-select-method) (cadr gnus-select-method)
 161          (gnus-status-message gnus-select-method)))
 162        (gnus-error 1 "Couldn't open server on %s"
 163                    (nth 1 gnus-select-method))))))
 164
 165 (defun gnus-check-group (group)
 166   "Try to make sure that the server where GROUP exists is alive."
 167   (let ((method (gnus-find-method-for-group group)))
 168     (or (gnus-server-opened method)
 169         (gnus-open-server method))))
 170
 171 (defun gnus-check-server (&optional method silent)
 172   "Check whether the connection to METHOD is down.
 173 If METHOD is nil, use `gnus-select-method'.
 174 If it is down, start it up (again)."
 175   (let ((method (or method gnus-select-method))
 176         result)
 177     ;; Transform virtual server names into select methods.
 178     (when (stringp method)
 179       (setq method (gnus-server-to-method method)))
 180     (if (gnus-server-opened method)
 181         ;; The stream is already opened.
 182         t
 183       ;; Open the server.
 184       (unless silent
 185         (gnus-message 5 "Opening %s server%s..." (car method)
 186                       (if (equal (nth 1 method) "") ""
 187                         (format " on %s" (nth 1 method)))))
 188       (gnus-run-hooks 'gnus-open-server-hook)
 189       (prog1
 190           (setq result (gnus-open-server method))
 191         (unless silent
 192           (gnus-message
 193            (if result 5 3)
 194            "Opening %s server%s...%s" (car method)
 195            (if (equal (nth 1 method) "") ""
 196              (format " on %s" (nth 1 method)))
 197            (if result
 198                "done"
 199              (format "failed: %s"
 200                      (nnheader-get-report-string (car method))))))))))
 201
 202 (defun gnus-get-function (method function &optional noerror)
 203   "Return a function symbol based on METHOD and FUNCTION."
 204   ;; Translate server names into methods.
 205   (unless method
 206     (error "Attempted use of a nil select method"))
 207   (when (stringp method)
 208     (setq method (gnus-server-to-method method)))
 209   ;; Check cache of constructed names.
 210   (let* ((method-sym (if gnus-agent
 211                          (inline (gnus-agent-get-function method))
 212                        (car method)))
 213          (method-fns (get method-sym 'gnus-method-functions))
 214          (func (let ((method-fnlist-elt (assq function method-fns)))
 215                  (unless method-fnlist-elt
 216                    (setq method-fnlist-elt
 217                          (cons function
 218                                (intern (format "%s-%s" method-sym function))))
 219                    (put method-sym 'gnus-method-functions
 220                         (cons method-fnlist-elt method-fns)))
 221                  (cdr method-fnlist-elt))))
 222     ;; Maybe complain if there is no function.
 223     (unless (fboundp func)
 224       (unless (car method)
 225         (error "Trying to require a method that doesn't exist"))
 226       (require (car method))
 227       (when (not (fboundp func))
 228         (if noerror
 229             (setq func nil)
 230           (error "No such function: %s" func))))
 231     func))
 232
 233 \f
 234 ;;;
 235 ;;; Interface functions to the backends.
 236 ;;;
 237
 238 (defun gnus-method-denied-p (method)
 239   (eq (nth 1 (assoc method gnus-opened-servers))
 240       'denied))
 241
 242 (defvar gnus-backend-trace t)
 243
 244 (defun gnus-open-server (gnus-command-method)
 245   "Open a connection to GNUS-COMMAND-METHOD."
 246   (when (stringp gnus-command-method)
 247     (setq gnus-command-method (gnus-server-to-method gnus-command-method)))
 248   (when gnus-backend-trace
 249     (with-current-buffer (get-buffer-create "*gnus trace*")
 250       (buffer-disable-undo)
 251       (goto-char (point-max))
 252       (insert (format-time-string "%H:%M:%S")
 253               (format " %S\n" gnus-command-method))))
 254   (let ((elem (assoc gnus-command-method gnus-opened-servers))
 255         (server (gnus-method-to-server-name gnus-command-method)))
 256     ;; If this method was previously denied, we just return nil.
 257     (if (eq (nth 1 elem) 'denied)
 258         (progn
 259           (gnus-message 1 "Denied server %s" server)
 260           nil)
 261       ;; Open the server.
 262       (let* ((open-server-function
 263               (gnus-get-function gnus-command-method 'open-server))
 264              (result
 265               (condition-case err
 266                   (funcall open-server-function
 267                            (nth 1 gnus-command-method)
 268                            (nthcdr 2 gnus-command-method))
 269                 (error
 270                  (gnus-message 1 "Unable to open server %s due to: %s"
 271                                server (error-message-string err))
 272                  nil)
 273                 (quit
 274                  (gnus-message 1 "Quit trying to open server %s" server)
 275                  nil)))
 276              open-offline)
 277         ;; If this hasn't been opened before, we add it to the list.
 278         (unless elem
 279           (setq elem (list gnus-command-method nil)
 280                 gnus-opened-servers (cons elem gnus-opened-servers)))
 281         ;; Set the status of this server.
 282         (setcar
 283          (cdr elem)
 284          (cond (result
 285                 (if (eq open-server-function #'nnagent-open-server)
 286                     ;; The agent's backend has a "special" status
 287                     'offline
 288                   'ok))
 289                ((and gnus-agent
 290                      (gnus-agent-method-p gnus-command-method))
 291                 (cond
 292                  (gnus-server-unopen-status
 293                   ;; Set the server's status to the unopen
 294                   ;; status.  If that status is offline,
 295                   ;; recurse to open the agent's backend.
 296                   (setq open-offline (eq gnus-server-unopen-status 'offline))
 297                   gnus-server-unopen-status)
 298                  ((not gnus-batch-mode)
 299                   (setq open-offline t)
 300                   'offline)
 301                  (t
 302                   ;; This agentized server was still denied
 303                   'denied)))
 304                (t
 305                 ;; This unagentized server must be denied
 306                 'denied)))
 307
 308         ;; NOTE: I MUST set the server's status to offline before this
 309         ;; recursive call as this status will drive the
 310         ;; gnus-get-function (called above) to return the agent's
 311         ;; backend.
 312         (if open-offline
 313             ;; Recursively open this offline server to perform the
 314             ;; open-server function of the agent's backend.
 315             (let ((gnus-server-unopen-status 'denied))
 316               ;; Bind gnus-server-unopen-status to avoid recursively
 317               ;; prompting with "go offline?".  This is only a concern
 318               ;; when the agent's backend fails to open the server.
 319               (gnus-open-server gnus-command-method))
 320           (when (and (eq (cadr elem) 'ok) gnus-agent
 321                      (gnus-agent-method-p gnus-command-method))
 322             (save-excursion
 323               (gnus-agent-possibly-synchronize-flags-server
 324                gnus-command-method)))
 325           result)))))
 326
 327 (defun gnus-close-server (gnus-command-method)
 328   "Close the connection to GNUS-COMMAND-METHOD."
 329   (when (stringp gnus-command-method)
 330     (setq gnus-command-method (gnus-server-to-method gnus-command-method)))
 331   (funcall (gnus-get-function gnus-command-method 'close-server)
 332            (nth 1 gnus-command-method)))
 333
 334 (defun gnus-request-list (gnus-command-method)
 335   "Request the active file from GNUS-COMMAND-METHOD."
 336   (when (stringp gnus-command-method)
 337     (setq gnus-command-method (gnus-server-to-method gnus-command-method)))
 338   (funcall (gnus-get-function gnus-command-method 'request-list)
 339            (nth 1 gnus-command-method)))
 340
 341 (defun gnus-finish-retrieve-group-infos (gnus-command-method infos data)
 342   "Read and update infos from GNUS-COMMAND-METHOD."
 343   (when (stringp gnus-command-method)
 344     (setq gnus-command-method (gnus-server-to-method gnus-command-method)))
 345   (funcall (gnus-get-function gnus-command-method 'finish-retrieve-group-infos)
 346            (nth 1 gnus-command-method)
 347            infos data))
 348
 349 (defun gnus-retrieve-group-data-early (gnus-command-method infos)
 350   "Start early async retrival of data 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 'retrieve-group-data-early)
 354            (nth 1 gnus-command-method)
 355            infos))
 356
 357 (defun gnus-request-list-newsgroups (gnus-command-method)
 358   "Request the newsgroups file from GNUS-COMMAND-METHOD."
 359   (when (stringp gnus-command-method)
 360     (setq gnus-command-method (gnus-server-to-method gnus-command-method)))
 361   (funcall (gnus-get-function gnus-command-method 'request-list-newsgroups)
 362            (nth 1 gnus-command-method)))
 363
 364 (defun gnus-request-newgroups (date gnus-command-method)
 365   "Request all new groups since DATE from GNUS-COMMAND-METHOD."
 366   (when (stringp gnus-command-method)
 367     (setq gnus-command-method (gnus-server-to-method gnus-command-method)))
 368   (let ((func (gnus-get-function gnus-command-method 'request-newgroups t)))
 369     (when func
 370       (funcall func date (nth 1 gnus-command-method)))))
 371
 372 (defun gnus-request-regenerate (gnus-command-method)
 373   "Request a data generation from GNUS-COMMAND-METHOD."
 374   (when (stringp gnus-command-method)
 375     (setq gnus-command-method (gnus-server-to-method gnus-command-method)))
 376   (funcall (gnus-get-function gnus-command-method 'request-regenerate)
 377            (nth 1 gnus-command-method)))
 378
 379 (defun gnus-request-compact-group (group)
 380   (let* ((method (gnus-find-method-for-group group))
 381          (gnus-command-method method)
 382          (result
 383           (funcall (gnus-get-function gnus-command-method
 384                                       'request-compact-group)
 385                    (gnus-group-real-name group)
 386                    (nth 1 gnus-command-method) t)))
 387     result))
 388
 389 (defun gnus-request-compact (gnus-command-method)
 390   "Request groups compaction  from GNUS-COMMAND-METHOD."
 391   (when (stringp gnus-command-method)
 392     (setq gnus-command-method (gnus-server-to-method gnus-command-method)))
 393   (funcall (gnus-get-function gnus-command-method 'request-compact)
 394            (nth 1 gnus-command-method)))
 395
 396 (defun gnus-request-group (group &optional dont-check gnus-command-method info)
 397   "Request GROUP.  If DONT-CHECK, no information is required."
 398   (let ((gnus-command-method
 399          (or gnus-command-method (inline (gnus-find-method-for-group group)))))
 400     (when (stringp gnus-command-method)
 401       (setq gnus-command-method
 402             (inline (gnus-server-to-method gnus-command-method))))
 403     (funcall (inline (gnus-get-function gnus-command-method 'request-group))
 404              (gnus-group-real-name group) (nth 1 gnus-command-method)
 405              dont-check
 406              info)))
 407
 408 (defun gnus-list-active-group (group)
 409   "Request active information on GROUP."
 410   (let ((gnus-command-method (gnus-find-method-for-group group))
 411         (func 'list-active-group))
 412     (when (gnus-check-backend-function func group)
 413       (funcall (gnus-get-function gnus-command-method func)
 414                (gnus-group-real-name group) (nth 1 gnus-command-method)))))
 415
 416 (defun gnus-request-group-description (group)
 417   "Request a description of GROUP."
 418   (let ((gnus-command-method (gnus-find-method-for-group group))
 419         (func 'request-group-description))
 420     (when (gnus-check-backend-function func group)
 421       (funcall (gnus-get-function gnus-command-method func)
 422                (gnus-group-real-name group) (nth 1 gnus-command-method)))))
 423
 424 (defun gnus-request-group-articles (group)
 425   "Request a list of existing articles in GROUP."
 426   (let ((gnus-command-method (gnus-find-method-for-group group))
 427         (func 'request-group-articles))
 428     (when (gnus-check-backend-function func group)
 429       (funcall (gnus-get-function gnus-command-method func)
 430                (gnus-group-real-name group) (nth 1 gnus-command-method)))))
 431
 432 (defun gnus-close-group (group)
 433   "Request the GROUP be closed."
 434   (let ((gnus-command-method (inline (gnus-find-method-for-group group))))
 435     (funcall (gnus-get-function gnus-command-method 'close-group)
 436              (gnus-group-real-name group) (nth 1 gnus-command-method))))
 437
 438 (defun gnus-retrieve-headers (articles group &optional fetch-old)
 439   "Request headers for ARTICLES in GROUP.
 440 If FETCH-OLD, retrieve all headers (or some subset thereof) in the group."
 441   (let ((gnus-command-method (gnus-find-method-for-group group)))
 442     (cond
 443      ((and gnus-use-cache (numberp (car articles)))
 444       (gnus-cache-retrieve-headers articles group fetch-old))
 445      ((and gnus-agent (gnus-online gnus-command-method)
 446            (gnus-agent-method-p gnus-command-method))
 447       (gnus-agent-retrieve-headers articles group fetch-old))
 448      (t
 449       (funcall (gnus-get-function gnus-command-method 'retrieve-headers)
 450                articles (gnus-group-real-name group)
 451                (nth 1 gnus-command-method) fetch-old)))))
 452
 453 (defun gnus-retrieve-articles (articles group)
 454   "Request ARTICLES in GROUP."
 455   (let ((gnus-command-method (gnus-find-method-for-group group)))
 456     (funcall (gnus-get-function gnus-command-method 'retrieve-articles)
 457              articles (gnus-group-real-name group)
 458              (nth 1 gnus-command-method))))
 459
 460 (defun gnus-retrieve-groups (groups gnus-command-method)
 461   "Request active information on GROUPS from GNUS-COMMAND-METHOD."
 462   (when (stringp gnus-command-method)
 463     (setq gnus-command-method (gnus-server-to-method gnus-command-method)))
 464   (funcall (gnus-get-function gnus-command-method 'retrieve-groups)
 465            groups (nth 1 gnus-command-method)))
 466
 467 (defun gnus-request-type (group &optional article)
 468   "Return the type (`post' or `mail') of GROUP (and ARTICLE)."
 469   (let ((gnus-command-method (gnus-find-method-for-group group)))
 470     (if (not (gnus-check-backend-function
 471               'request-type (car gnus-command-method)))
 472         'unknown
 473       (funcall (gnus-get-function gnus-command-method 'request-type)
 474                (gnus-group-real-name group) article))))
 475
 476 (defun gnus-request-update-group-status (group status)
 477   "Change the status of a group.
 478 Valid statuses include `subscribe' and `unsubscribe'."
 479   (let ((gnus-command-method (gnus-find-method-for-group group)))
 480     (if (not (gnus-check-backend-function
 481               'request-update-group-status (car gnus-command-method)))
 482         nil
 483       (funcall
 484        (gnus-get-function gnus-command-method 'request-update-group-status)
 485        (gnus-group-real-name group) status
 486        (nth 1 gnus-command-method)))))
 487
 488 (defun gnus-request-set-mark (group action)
 489   "Set marks on articles in the back end."
 490   (let ((gnus-command-method (gnus-find-method-for-group group)))
 491     (if (not (gnus-check-backend-function
 492               'request-set-mark (car gnus-command-method)))
 493         action
 494       (funcall (gnus-get-function gnus-command-method 'request-set-mark)
 495                (gnus-group-real-name group) action
 496                (nth 1 gnus-command-method))
 497       (gnus-run-hook-with-args gnus-after-set-mark-hook group action))))
 498
 499 (defun gnus-request-update-mark (group article mark)
 500   "Allow the back end to change the mark the user tries to put on an article."
 501   (let ((gnus-command-method (gnus-find-method-for-group group)))
 502     (if (not (gnus-check-backend-function
 503               'request-update-mark (car gnus-command-method)))
 504         mark
 505       (gnus-run-hook-with-args gnus-before-update-mark-hook group article mark)
 506       (funcall (gnus-get-function gnus-command-method 'request-update-mark)
 507                (gnus-group-real-name group) article mark))))
 508
 509 (defun gnus-request-article (article group &optional buffer)
 510   "Request the ARTICLE in GROUP.
 511 ARTICLE can either be an article number or an article Message-ID.
 512 If BUFFER, insert the article in that group."
 513   (let ((gnus-command-method (gnus-find-method-for-group group)))
 514     (funcall (gnus-get-function gnus-command-method 'request-article)
 515              article (gnus-group-real-name group)
 516              (nth 1 gnus-command-method) buffer)))
 517
 518 (defun gnus-request-thread (header)
 519   "Request the headers in the thread containing the article specified by HEADER."
 520   (let ((gnus-command-method (gnus-find-method-for-group gnus-newsgroup-name)))
 521     (funcall (gnus-get-function gnus-command-method 'request-thread)
 522              header)))
 523
 524 (defun gnus-warp-to-article ()
 525   "Warps from an article in a virtual group to the article in its
 526 real group. Does nothing on a real group."
 527   (interactive)
 528   (let ((gnus-command-method
 529          (gnus-find-method-for-group gnus-newsgroup-name)))
 530     (when (gnus-check-backend-function
 531            'warp-to-article (car gnus-command-method))
 532       (funcall (gnus-get-function gnus-command-method 'warp-to-article)))))
 533
 534 (defun gnus-request-head (article group)
 535   "Request the head of ARTICLE in GROUP."
 536   (let* ((gnus-command-method (gnus-find-method-for-group group))
 537          (head (gnus-get-function gnus-command-method 'request-head t))
 538          res clean-up)
 539     (cond
 540      ;; Check the cache.
 541      ((and gnus-use-cache
 542            (numberp article)
 543            (gnus-cache-request-article article group))
 544       (setq res (cons group article)
 545             clean-up t))
 546      ;; Check the agent cache.
 547      ((gnus-agent-request-article article group)
 548       (setq res (cons group article)
 549             clean-up t))
 550      ;; Use `head' function.
 551      ((fboundp head)
 552       (setq res (funcall head article (gnus-group-real-name group)
 553                          (nth 1 gnus-command-method))))
 554      ;; Use `article' function.
 555      (t
 556       (setq res (gnus-request-article article group)
 557             clean-up t)))
 558     (when clean-up
 559       (with-current-buffer nntp-server-buffer
 560         (goto-char (point-min))
 561         (when (search-forward "\n\n" nil t)
 562           (delete-region (1- (point)) (point-max)))
 563         (nnheader-fold-continuation-lines)))
 564     res))
 565
 566 (defun gnus-request-body (article group)
 567   "Request the body of ARTICLE in GROUP."
 568   (let* ((gnus-command-method (gnus-find-method-for-group group))
 569          (head (gnus-get-function gnus-command-method 'request-body t))
 570          res clean-up)
 571     (cond
 572      ;; Check the cache.
 573      ((and gnus-use-cache
 574            (numberp article)
 575            (gnus-cache-request-article article group))
 576       (setq res (cons group article)
 577             clean-up t))
 578      ;; Check the agent cache.
 579      ((gnus-agent-request-article article group)
 580       (setq res (cons group article)
 581             clean-up t))
 582      ;; Use `head' function.
 583      ((fboundp head)
 584       (setq res (funcall head article (gnus-group-real-name group)
 585                          (nth 1 gnus-command-method))))
 586      ;; Use `article' function.
 587      (t
 588       (setq res (gnus-request-article article group)
 589             clean-up t)))
 590     (when clean-up
 591       (with-current-buffer nntp-server-buffer
 592         (goto-char (point-min))
 593         (when (search-forward "\n\n" nil t)
 594           (delete-region (point-min) (1- (point))))))
 595     res))
 596
 597 (defun gnus-request-post (gnus-command-method)
 598   "Post the current buffer using GNUS-COMMAND-METHOD."
 599   (when (stringp gnus-command-method)
 600     (setq gnus-command-method (gnus-server-to-method gnus-command-method)))
 601   (funcall (gnus-get-function gnus-command-method 'request-post)
 602            (nth 1 gnus-command-method)))
 603
 604 (defun gnus-request-expunge-group (group gnus-command-method)
 605   "Expunge GROUP, which is removing articles that have been marked as deleted."
 606   (when (stringp gnus-command-method)
 607     (setq gnus-command-method (gnus-server-to-method gnus-command-method)))
 608   (funcall (gnus-get-function gnus-command-method 'request-expunge-group)
 609            (gnus-group-real-name group)
 610            (nth 1 gnus-command-method)))
 611
 612 (defun gnus-request-scan (group gnus-command-method)
 613   "Request a SCAN being performed in GROUP from GNUS-COMMAND-METHOD.
 614 If GROUP is nil, all groups on GNUS-COMMAND-METHOD are scanned."
 615   (let ((gnus-command-method
 616          (if group (gnus-find-method-for-group group) gnus-command-method))
 617         (gnus-inhibit-demon t)
 618         (mail-source-plugged gnus-plugged))
 619     (when (or gnus-plugged
 620               (not (gnus-agent-method-p gnus-command-method)))
 621       (setq gnus-internal-registry-spool-current-method gnus-command-method)
 622       (funcall (gnus-get-function gnus-command-method 'request-scan)
 623                (and group (gnus-group-real-name group))
 624                (nth 1 gnus-command-method)))))
 625
 626 (defun gnus-request-update-info (info gnus-command-method)
 627   (when (gnus-check-backend-function
 628          'request-update-info (car gnus-command-method))
 629     (when (stringp gnus-command-method)
 630       (setq gnus-command-method (gnus-server-to-method gnus-command-method)))
 631     (funcall (gnus-get-function gnus-command-method 'request-update-info)
 632              (gnus-group-real-name (gnus-info-group info)) info
 633              (nth 1 gnus-command-method))))
 634
 635 (defsubst gnus-request-marks (info gnus-command-method)
 636   "Request that GNUS-COMMAND-METHOD update INFO."
 637   (when (stringp gnus-command-method)
 638     (setq gnus-command-method (gnus-server-to-method gnus-command-method)))
 639   (when (gnus-check-backend-function
 640          'request-marks (car gnus-command-method))
 641     (let ((group (gnus-info-group info)))
 642       (and (funcall (gnus-get-function gnus-command-method
 643                                        'request-update-info)
 644                     (gnus-group-real-name group)
 645                     info (nth 1 gnus-command-method))
 646            ;; If the minimum article number is greater than 1, then all
 647            ;; smaller article numbers are known not to exist; we'll
 648            ;; artificially add those to the 'read range.
 649            (let* ((active (gnus-active group))
 650                   (min (car active)))
 651              (when (> min 1)
 652                (let* ((range (if (= min 2) 1 (cons 1 (1- min))))
 653                       (read (gnus-info-read info))
 654                       (new-read (gnus-range-add read (list range))))
 655                  (gnus-info-set-read info new-read)))
 656              info)))))
 657
 658 (defun gnus-request-expire-articles (articles group &optional force)
 659   (let* ((gnus-command-method (gnus-find-method-for-group group))
 660          (gnus-inhibit-demon t)
 661          (not-deleted
 662           (funcall
 663            (gnus-get-function gnus-command-method 'request-expire-articles)
 664            articles (gnus-group-real-name group) (nth 1 gnus-command-method)
 665            force)))
 666     (when (and gnus-agent
 667                (gnus-agent-method-p gnus-command-method))
 668       (let ((expired-articles (gnus-sorted-difference articles not-deleted)))
 669         (when expired-articles
 670           (gnus-agent-expire expired-articles group 'force))))
 671     not-deleted))
 672
 673 (defun gnus-request-move-article (article group server accept-function
 674                                           &optional last move-is-internal)
 675   (let* ((gnus-command-method (gnus-find-method-for-group group))
 676          (result (funcall (gnus-get-function gnus-command-method
 677                                              'request-move-article)
 678                           article (gnus-group-real-name group)
 679                           (nth 1 gnus-command-method) accept-function
 680                           last move-is-internal)))
 681     (when (and result gnus-agent
 682                (gnus-agent-method-p gnus-command-method))
 683       (gnus-agent-unfetch-articles group (list article)))
 684     result))
 685
 686 (defun gnus-request-accept-article (group &optional gnus-command-method last
 687                                           no-encode)
 688   ;; Make sure there's a newline at the end of the article.
 689   (when (stringp gnus-command-method)
 690     (setq gnus-command-method (gnus-server-to-method gnus-command-method)))
 691   (when (and (not gnus-command-method)
 692              (stringp group))
 693     (setq gnus-command-method (or (gnus-find-method-for-group group)
 694                                   (gnus-group-name-to-method group))))
 695   (goto-char (point-max))
 696   (unless (bolp)
 697     (insert "\n"))
 698   (unless no-encode
 699     (let ((message-options message-options))
 700       (message-options-set-recipient)
 701       (save-restriction
 702         (message-narrow-to-head)
 703         (let ((mail-parse-charset message-default-charset))
 704           (mail-encode-encoded-word-buffer)))
 705       (message-encode-message-body)))
 706   (let ((gnus-command-method (or gnus-command-method
 707                                  (gnus-find-method-for-group group)))
 708         (result
 709          (funcall
 710           (gnus-get-function gnus-command-method 'request-accept-article)
 711           (if (stringp group) (gnus-group-real-name group) group)
 712           (cadr gnus-command-method)
 713           last)))
 714     (when (and gnus-agent
 715                (gnus-agent-method-p gnus-command-method)
 716                (cdr result))
 717       (gnus-agent-regenerate-group group (list (cdr result))))
 718     result))
 719
 720 (defun gnus-request-replace-article (article group buffer &optional no-encode)
 721   (unless no-encode
 722     (let ((message-options message-options))
 723       (message-options-set-recipient)
 724       (save-restriction
 725         (message-narrow-to-head)
 726         (let ((mail-parse-charset message-default-charset))
 727           (mail-encode-encoded-word-buffer)))
 728       (message-encode-message-body)))
 729   (let* ((func (car (gnus-group-name-to-method group)))
 730          (result (funcall (intern (format "%s-request-replace-article" func))
 731                           article (gnus-group-real-name group) buffer)))
 732     (when (and gnus-agent (gnus-agent-method-p gnus-command-method))
 733       (gnus-agent-regenerate-group group (list article)))
 734     result))
 735
 736 (defun gnus-request-associate-buffer (group)
 737   (let ((gnus-command-method (gnus-find-method-for-group group)))
 738     (funcall (gnus-get-function gnus-command-method 'request-associate-buffer)
 739              (gnus-group-real-name group))))
 740
 741 (defun gnus-request-restore-buffer (article group)
 742   "Request a new buffer restored to the state of ARTICLE."
 743   (let ((gnus-command-method (gnus-find-method-for-group group)))
 744     (funcall (gnus-get-function gnus-command-method 'request-restore-buffer)
 745              article (gnus-group-real-name group)
 746              (nth 1 gnus-command-method))))
 747
 748 (defun gnus-request-create-group (group &optional gnus-command-method args)
 749   (when (stringp gnus-command-method)
 750     (setq gnus-command-method (gnus-server-to-method gnus-command-method)))
 751   (let ((gnus-command-method
 752          (or gnus-command-method (gnus-find-method-for-group group))))
 753     (funcall (gnus-get-function gnus-command-method 'request-create-group)
 754              (gnus-group-real-name group) (nth 1 gnus-command-method) args)))
 755
 756 (defun gnus-request-delete-group (group &optional force)
 757   (let* ((gnus-command-method (gnus-find-method-for-group group))
 758          (result
 759           (funcall (gnus-get-function gnus-command-method 'request-delete-group)
 760                    (gnus-group-real-name group) force (nth 1 gnus-command-method))))
 761     (when result
 762       (gnus-cache-delete-group group)
 763       (gnus-agent-delete-group group))
 764     result))
 765
 766 (defun gnus-request-rename-group (group new-name)
 767   (let* ((gnus-command-method (gnus-find-method-for-group group))
 768          (result
 769           (funcall (gnus-get-function gnus-command-method 'request-rename-group)
 770                    (gnus-group-real-name group)
 771                    (gnus-group-real-name new-name) (nth 1 gnus-command-method))))
 772     (when result
 773       (gnus-cache-rename-group group new-name)
 774       (gnus-agent-rename-group group new-name))
 775     result))
 776
 777 (defun gnus-close-backends ()
 778   ;; Send a close request to all backends that support such a request.
 779   (let ((methods gnus-valid-select-methods)
 780         (gnus-inhibit-demon t)
 781         func gnus-command-method)
 782     (while (setq gnus-command-method (pop methods))
 783       (when (fboundp (setq func (intern
 784                                  (concat (car gnus-command-method)
 785                                          "-request-close"))))
 786         (funcall func)))))
 787
 788 (defun gnus-asynchronous-p (gnus-command-method)
 789   (let ((func (gnus-get-function gnus-command-method 'asynchronous-p t)))
 790     (when (fboundp func)
 791       (funcall func))))
 792
 793 (defun gnus-remove-denial (gnus-command-method)
 794   (when (stringp gnus-command-method)
 795     (setq gnus-command-method (gnus-server-to-method gnus-command-method)))
 796   (let* ((elem (assoc gnus-command-method gnus-opened-servers))
 797          (status (cadr elem)))
 798     ;; If this hasn't been opened before, we add it to the list.
 799     (when (eq status 'denied)
 800       ;; Set the status of this server.
 801       (setcar (cdr elem) 'closed))))
 802
 803 (provide 'gnus-int)
 804
 805 ;;; gnus-int.el ends here