lisp/gnus/nnagent.el

   1 ;;; nnagent.el --- offline backend for Gnus
   2
   3 ;; Copyright (C) 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, mail
   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 (require 'nnheader)
  29 (require 'nnoo)
  30 (eval-when-compile (require 'cl))
  31 (require 'gnus-agent)
  32 (require 'nnml)
  33
  34 (nnoo-declare nnagent
  35   nnml)
  36
  37 \f
  38
  39 (defconst nnagent-version "nnagent 1.0")
  40
  41 (defvoo nnagent-directory nil
  42   "Internal variable."
  43   nnml-directory)
  44
  45 (defvoo nnagent-active-file nil
  46   "Internal variable."
  47   nnml-active-file)
  48
  49 (defvoo nnagent-newsgroups-file nil
  50   "Internal variable."
  51   nnml-newsgroups-file)
  52
  53 (defvoo nnagent-get-new-mail nil
  54   "Internal variable."
  55   nnml-get-new-mail)
  56
  57 ;;; Interface functions.
  58
  59 (nnoo-define-basics nnagent)
  60
  61 (defun nnagent-server (server)
  62   (and server (format "%s+%s" (car gnus-command-method) server)))
  63
  64 (deffoo nnagent-open-server (server &optional defs)
  65   (setq defs
  66         `((nnagent-directory ,(gnus-agent-directory))
  67           (nnagent-active-file ,(gnus-agent-lib-file "active"))
  68           (nnagent-newsgroups-file ,(gnus-agent-lib-file "newsgroups"))
  69           (nnagent-get-new-mail nil)))
  70   (nnoo-change-server 'nnagent
  71                       (nnagent-server server)
  72                       defs)
  73   (let ((dir (gnus-agent-directory))
  74         err)
  75     (cond
  76      ((not (condition-case arg
  77                (file-exists-p dir)
  78              (ftp-error (setq err (format "%s" arg)))))
  79       (nnagent-close-server)
  80       (nnheader-report
  81        'nnagent (or err
  82                     (format "No such file or directory: %s" dir))))
  83      ((not (file-directory-p (file-truename dir)))
  84       (nnagent-close-server)
  85       (nnheader-report 'nnagent "Not a directory: %s" dir))
  86      (t
  87       (nnheader-report 'nnagent "Opened server %s using directory %s"
  88                        server dir)
  89       t))))
  90
  91 (deffoo nnagent-retrieve-groups (groups &optional server)
  92   (save-excursion
  93     (cond
  94      ((file-exists-p (gnus-agent-lib-file "groups"))
  95       (nnmail-find-file (gnus-agent-lib-file "groups"))
  96       'groups)
  97      ((file-exists-p (gnus-agent-lib-file "active"))
  98       (nnmail-find-file (gnus-agent-lib-file "active"))
  99       'active)
 100      (t nil))))
 101
 102 (defun nnagent-request-type (group article)
 103   (unless (stringp article)
 104     (let ((gnus-agent nil))
 105       (if (not (gnus-check-backend-function
 106                 'request-type (car gnus-command-method)))
 107           'unknown
 108         (funcall (gnus-get-function gnus-command-method 'request-type)
 109                  (gnus-group-real-name group) article)))))
 110
 111 (deffoo nnagent-request-newgroups (date server)
 112   nil)
 113
 114 (deffoo nnagent-request-update-info (group info &optional server)
 115   nil)
 116
 117 (deffoo nnagent-request-post (&optional server)
 118   (gnus-agent-insert-meta-information 'news gnus-command-method)
 119   (gnus-request-accept-article "nndraft:queue" nil t t))
 120
 121 (deffoo nnagent-request-set-mark (group action server)
 122   (mm-with-unibyte-buffer
 123     (insert "(gnus-agent-synchronize-group-flags \""
 124             group
 125             "\" '")
 126     (gnus-pp action)
 127     (insert " \""
 128             (gnus-method-to-server gnus-command-method)
 129             "\"")
 130     (insert ")\n")
 131     (let ((coding-system-for-write nnheader-file-coding-system))
 132       (write-region (point-min) (point-max) (gnus-agent-lib-file "flags")
 133                     t 'silent)))
 134   ;; Also set the marks for the original back end that keeps marks in
 135   ;; the local system.
 136   (let ((gnus-agent nil))
 137     (when (and (memq (car gnus-command-method) '(nntp))
 138                (gnus-check-backend-function 'request-set-mark
 139                                             (car gnus-command-method)))
 140       (funcall (gnus-get-function gnus-command-method 'request-set-mark)
 141                group action server)))
 142   nil)
 143
 144 (deffoo nnagent-retrieve-headers (articles &optional group server fetch-old)
 145   (let ((file (gnus-agent-article-name ".overview" group))
 146         arts n first)
 147     (save-excursion
 148       (gnus-agent-load-alist group)
 149       (setq arts (gnus-sorted-difference
 150                   articles (mapcar 'car gnus-agent-article-alist)))
 151       ;; Assume that articles with smaller numbers than the first one
 152       ;; Agent knows are gone.
 153       (setq first (caar gnus-agent-article-alist))
 154       (when first
 155         (while (and arts (< (car arts) first))
 156           (pop arts)))
 157       (set-buffer nntp-server-buffer)
 158       (erase-buffer)
 159       (let ((file-name-coding-system nnmail-pathname-coding-system))
 160         (nnheader-insert-nov-file file (car articles)))
 161       (goto-char (point-min))
 162       (gnus-parse-without-error
 163         (while (and arts (not (eobp)))
 164           (setq n (read (current-buffer)))
 165           (when (> n (car arts))
 166             (beginning-of-line))
 167           (while (and arts (> n (car arts)))
 168             (insert (format
 169                      "%d\t[Undownloaded article %d]\tGnus Agent\t\t\t\n"
 170                      (car arts) (car arts)))
 171             (pop arts))
 172           (when (and arts (= n (car arts)))
 173             (pop arts))
 174           (forward-line 1)))
 175       (while arts
 176         (insert (format
 177                  "%d\t[Undownloaded article %d]\tGnus Agent\t\t\t\n"
 178                  (car arts) (car arts)))
 179         (pop arts))
 180       (if (and fetch-old
 181                (not (numberp fetch-old)))
 182           t                             ; Don't remove anything.
 183         (nnheader-nov-delete-outside-range
 184          (if fetch-old (max 1 (- (car articles) fetch-old))
 185            (car articles))
 186          (car (last articles)))
 187         t)
 188       'nov)))
 189
 190 (deffoo nnagent-request-expire-articles (articles group &optional server force)
 191   articles)
 192
 193 (deffoo nnagent-request-group (group &optional server dont-check)
 194   (nnoo-parent-function 'nnagent 'nnml-request-group
 195                         (list group (nnagent-server server) dont-check)))
 196
 197 (deffoo nnagent-close-group (group &optional server)
 198   (nnoo-parent-function 'nnagent 'nnml-close-group
 199                         (list group (nnagent-server server))))
 200
 201 (deffoo nnagent-request-accept-article (group &optional server last)
 202   (nnoo-parent-function 'nnagent 'nnml-request-accept-article
 203                         (list group (nnagent-server server) last)))
 204
 205 (deffoo nnagent-request-article (id &optional group server buffer)
 206   (nnoo-parent-function 'nnagent 'nnml-request-article
 207                         (list id group (nnagent-server server) buffer)))
 208
 209 (deffoo nnagent-request-create-group (group &optional server args)
 210   (nnoo-parent-function 'nnagent 'nnml-request-create-group
 211                         (list group (nnagent-server server) args)))
 212
 213 (deffoo nnagent-request-delete-group (group &optional force server)
 214   (nnoo-parent-function 'nnagent 'nnml-request-delete-group
 215                         (list group force (nnagent-server server))))
 216
 217 (deffoo nnagent-request-list (&optional server)
 218   (nnoo-parent-function 'nnagent 'nnml-request-list
 219                         (list (nnagent-server server))))
 220
 221 (deffoo nnagent-request-list-newsgroups (&optional server)
 222   (nnoo-parent-function 'nnagent 'nnml-request-list-newsgroups
 223                         (list (nnagent-server server))))
 224
 225 (deffoo nnagent-request-move-article
 226     (article group server accept-form &optional last move-is-internal)
 227   (nnoo-parent-function 'nnagent 'nnml-request-move-article
 228                         (list article group (nnagent-server server)
 229                               accept-form last move-is-internal)))
 230
 231 (deffoo nnagent-request-rename-group (group new-name &optional server)
 232   (nnoo-parent-function 'nnagent 'nnml-request-rename-group
 233                         (list group new-name (nnagent-server server))))
 234
 235 (deffoo nnagent-request-scan (&optional group server)
 236   (nnoo-parent-function 'nnagent 'nnml-request-scan
 237                         (list group (nnagent-server server))))
 238
 239 (deffoo nnagent-set-status (article name value &optional group server)
 240   (nnoo-parent-function 'nnagent 'nnml-set-status
 241                         (list article name value group (nnagent-server server))))
 242
 243 (deffoo nnagent-server-opened (&optional server)
 244   (nnoo-parent-function 'nnagent 'nnml-server-opened
 245                         (list (nnagent-server server))))
 246
 247 (deffoo nnagent-status-message (&optional server)
 248   (nnoo-parent-function 'nnagent 'nnml-status-message
 249                         (list (nnagent-server server))))
 250
 251 (deffoo nnagent-request-regenerate (server)
 252   (nnoo-parent-function 'nnagent 'nnml-request-regenerate
 253                         (list (nnagent-server server))))
 254
 255 ;; Use nnml functions for just about everything.
 256 (nnoo-import nnagent
 257   (nnml))
 258
 259 \f
 260 ;;; Internal functions.
 261
 262 (provide 'nnagent)
 263
 264 ;; arch-tag: af710b77-f816-4969-af31-6fd94fb42245
 265 ;;; nnagent.el ends here