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+;;; org-gnus.el --- Support for links to Gnus groups and messages from within Org-mode
+
+;; Copyright (C) 2004, 2005, 2006, 2007, 2008 Free Software Foundation, Inc.
+
+;; Author: Carsten Dominik <carsten at orgmode dot org>
+;; Keywords: outlines, hypermedia, calendar, wp
+;; Homepage: http://orgmode.org
+;; Version: 6.02b
+;;
+;; This file is part of GNU Emacs.
+;;
+;; GNU Emacs is free software; you can redistribute it and/or modify
+;; it under the terms of the GNU General Public License as published by
+;; the Free Software Foundation; either version 3, or (at your option)
+;; any later version.
+
+;; GNU Emacs is distributed in the hope that it will be useful,
+;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;; GNU General Public License for more details.
+
+;; You should have received a copy of the GNU General Public License
+;; along with GNU Emacs; see the file COPYING.  If not, write to the
+;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+;; Boston, MA 02110-1301, USA.
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;;
+;;; Commentary:
+
+;; This file implements links to Gnus groups and messages from within Org-mode.
+;; Org-mode loads this module by default - if this is not what you want,
+;; configure the variable `org-modules'.
+
+;;; Code:
+
+(require 'org)
+(eval-when-compile
+  (require 'gnus-sum))
+
+;; Customization variables
+
+(defcustom org-usenet-links-prefer-google nil
+  "Non-nil means, `org-store-link' will create web links to Google groups.
+When nil, Gnus will be used for such links.
+Using a prefix arg to the command \\[org-store-link] (`org-store-link')
+negates this setting for the duration of the command."
+  :group 'org-link-store
+  :type 'boolean)
+
+;; Declare external functions and variables
+(declare-function gnus-article-show-summary "gnus-art" ())
+(declare-function gnus-summary-last-subject "gnus-sum" ())
+(defvar gnus-other-frame-object)
+(defvar gnus-group-name)
+(defvar gnus-article-current)
+
+;; Install the link type
+(org-add-link-type "gnus" 'org-gnus-open)
+(add-hook 'org-store-link-functions 'org-gnus-store-link)
+
+;; Implementation
+(defun org-gnus-store-link ()
+  "Store a link to a Gnus folder or message."
+  (cond
+   ((eq major-mode 'gnus-group-mode)
+    (let ((group (cond ((fboundp 'gnus-group-group-name) ; depending on Gnus
+			(gnus-group-group-name))         ; version
+		       ((fboundp 'gnus-group-name)
+			(gnus-group-name))
+		       (t "???")))
+	  desc link)
+      (unless group (error "Not on a group"))
+      (org-store-link-props :type "gnus" :group group)
+      (setq desc (concat
+		  (if (org-xor current-prefix-arg
+			       org-usenet-links-prefer-google)
+		      "http://groups.google.com/groups?group="
+		    "gnus:")
+		  group)
+	    link (org-make-link desc))
+      (org-add-link-props :link link :description desc)
+      link))
+
+   ((memq major-mode '(gnus-summary-mode gnus-article-mode))
+    (and (eq major-mode 'gnus-article-mode) (gnus-article-show-summary))
+    (let* ((group gnus-newsgroup-name)
+	   (article (gnus-summary-article-number))
+	   (header (gnus-summary-article-header article))
+	   (from (mail-header-from header))
+	   (message-id (mail-header-id header))
+	   (date (mail-header-date header))
+	   (subject (gnus-summary-subject-string))
+	   desc link)
+      (org-store-link-props :type "gnus" :from from :subject subject
+			    :message-id message-id :group group)
+      (setq desc (org-email-link-description))
+      (if (org-xor current-prefix-arg org-usenet-links-prefer-google)
+	  (setq link
+		(concat
+		 desc "\n  "
+		 (format "http://groups.google.com/groups?as_umsgid=%s"
+			 (org-fixup-message-id-for-http message-id))))
+	(setq link (org-make-link "gnus:" group
+				  "#" (number-to-string article))))
+      (org-add-link-props :link link :description desc)
+      link))))
+
+(defun org-gnus-open (path)
+  "Follow the Gnus message or folder link specified by PATH."
+  (let (group article)
+    (if (not (string-match "\\`\\([^#]+\\)\\(#\\(.*\\)\\)?" path))
+	(error "Error in Gnus link"))
+    (setq group (match-string 1 path)
+	  article (match-string 3 path))
+    (org-gnus-follow-link group article)))
+
+(defun org-gnus-follow-link (&optional group article)
+  "Follow a Gnus link to GROUP and ARTICLE."
+  (require 'gnus)
+  (funcall (cdr (assq 'gnus org-link-frame-setup)))
+  (if gnus-other-frame-object (select-frame gnus-other-frame-object))
+  (cond ((and group article)
+	 (gnus-group-read-group 1 nil group)
+	 (gnus-summary-goto-article (string-to-number article) nil t))
+	(group (gnus-group-jump-to-group group))))
+
+(provide 'org-gnus)
+
+;;; org-gnus.el ends here