lisp/org-gnus.el

   1 ;;; org-gnus.el --- Support for links to Gnus groups and messages from within Org-mode
   2
   3 ;; Copyright (C) 2004, 2005, 2006, 2007, 2008 Free Software Foundation, Inc.
   4
   5 ;; Author: Carsten Dominik <carsten at orgmode dot org>
   6 ;; Keywords: outlines, hypermedia, calendar, wp
   7 ;; Homepage: http://orgmode.org
   8 ;; Version: 6.01a
   9 ;;
  10 ;; This file is part of GNU Emacs.
  11 ;;
  12 ;; GNU Emacs is free software; you can redistribute it and/or modify
  13 ;; it under the terms of the GNU General Public License as published by
  14 ;; the Free Software Foundation; either version 3, or (at your option)
  15 ;; any later version.
  16
  17 ;; GNU Emacs is distributed in the hope that it will be useful,
  18 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  19 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20 ;; GNU General Public License for more details.
  21
  22 ;; You should have received a copy of the GNU General Public License
  23 ;; along with GNU Emacs; see the file COPYING.  If not, write to the
  24 ;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  25 ;; Boston, MA 02110-1301, USA.
  26 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
  27 ;;
  28 ;;; Commentary:
  29
  30 ;; This file implements links to Gnus groups and messages from within Org-mode.
  31 ;; Org-mode loads this module by default - if this is not what you want,
  32 ;; configure the variable `org-modules'.
  33
  34 ;;; Code:
  35
  36 (require 'org)
  37 (eval-when-compile
  38   (require 'gnus-sum))
  39
  40 ;; Customization variables
  41
  42 (defcustom org-usenet-links-prefer-google nil
  43   "Non-nil means, `org-store-link' will create web links to Google groups.
  44 When nil, Gnus will be used for such links.
  45 Using a prefix arg to the command \\[org-store-link] (`org-store-link')
  46 negates this setting for the duration of the command."
  47   :group 'org-link-store
  48   :type 'boolean)
  49
  50 ;; Declare external functions and variables
  51 (declare-function gnus-article-show-summary "gnus-art" ())
  52 (declare-function gnus-summary-last-subject "gnus-sum" ())
  53 (defvar gnus-other-frame-object)
  54 (defvar gnus-group-name)
  55 (defvar gnus-article-current)
  56
  57 ;; Install the link type
  58 (org-add-link-type "gnus" 'org-gnus-open)
  59 (add-hook 'org-store-link-functions 'org-gnus-store-link)
  60
  61 ;; Implementation
  62 (defun org-gnus-store-link ()
  63   "Store a link to a Gnus folder or message."
  64   (cond
  65    ((eq major-mode 'gnus-group-mode)
  66     (let ((group (cond ((fboundp 'gnus-group-group-name) ; depending on Gnus
  67                         (gnus-group-group-name))         ; version
  68                        ((fboundp 'gnus-group-name)
  69                         (gnus-group-name))
  70                        (t "???")))
  71           desc link)
  72       (unless group (error "Not on a group"))
  73       (org-store-link-props :type "gnus" :group group)
  74       (setq desc (concat
  75                   (if (org-xor current-prefix-arg
  76                                org-usenet-links-prefer-google)
  77                       "http://groups.google.com/groups?group="
  78                     "gnus:")
  79                   group)
  80             link (org-make-link desc))
  81       (org-add-link-props :link link :description desc)
  82       link))
  83
  84    ((memq major-mode '(gnus-summary-mode gnus-article-mode))
  85     (and (eq major-mode 'gnus-article-mode) (gnus-article-show-summary))
  86     (let* ((group gnus-newsgroup-name)
  87            (article (gnus-summary-article-number))
  88            (header (gnus-summary-article-header article))
  89            (from (mail-header-from header))
  90            (message-id (mail-header-id header))
  91            (date (mail-header-date header))
  92            (subject (gnus-summary-subject-string))
  93            desc link)
  94       (org-store-link-props :type "gnus" :from from :subject subject
  95                             :message-id message-id :group group)
  96       (setq desc (org-email-link-description))
  97       (if (org-xor current-prefix-arg org-usenet-links-prefer-google)
  98           (setq link
  99                 (concat
 100                  desc "\n  "
 101                  (format "http://groups.google.com/groups?as_umsgid=%s"
 102                          (org-fixup-message-id-for-http message-id))))
 103         (setq link (org-make-link "gnus:" group
 104                                   "#" (number-to-string article))))
 105       (org-add-link-props :link link :description desc)
 106       link))))
 107
 108 (defun org-gnus-open (path)
 109   "Follow the Gnus message or folder link specified by PATH."
 110   (let (group article)
 111     (if (not (string-match "\\`\\([^#]+\\)\\(#\\(.*\\)\\)?" path))
 112         (error "Error in Gnus link"))
 113     (setq group (match-string 1 path)
 114           article (match-string 3 path))
 115     (org-gnus-follow-link group article)))
 116
 117 (defun org-gnus-follow-link (&optional group article)
 118   "Follow a Gnus link to GROUP and ARTICLE."
 119   (require 'gnus)
 120   (funcall (cdr (assq 'gnus org-link-frame-setup)))
 121   (if gnus-other-frame-object (select-frame gnus-other-frame-object))
 122   (cond ((and group article)
 123          (gnus-group-read-group 1 nil group)
 124          (gnus-summary-goto-article (string-to-number article) nil t))
 125         (group (gnus-group-jump-to-group group))))
 126
 127 (provide 'org-gnus)
 128
 129 ;;; org-gnus.el ends here