;;; org-rmail.el --- Support for links to Rmail messages from within Org-mode

;; Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009
;;   Free Software Foundation, Inc.

;; Author: Carsten Dominik <carsten at orgmode dot org>
;; Keywords: outlines, hypermedia, calendar, wp
;; Homepage: http://orgmode.org
;; Version: 6.21b
;;
;; 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 of the License, 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.  If not, see <http://www.gnu.org/licenses/>.
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;
;;; Commentary:

;; This file implements links to Rmail 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)

;; Declare external functions and variables
(declare-function rmail-show-message "rmail" (&optional n no-summary))
(declare-function rmail-get-header "rmail" (name &optional msgnum))
(declare-function rmail-what-message "rmail" ())
(defvar rmail-current-message)
(defvar rmail-buffer)
(defvar rmail-view-buffer)

;; Install the link type
(org-add-link-type "rmail" 'org-rmail-open)
(add-hook 'org-store-link-functions 'org-rmail-store-link)

;; Implementation
(defun org-rmail-store-link ()
  "Store a link to an Rmail folder or message."
  (when (memq major-mode '(rmail-mode rmail-summary-mode))
    (let (message-id from to subject desc link)
      (if (fboundp 'rmail-get-header)	; Emacs 23
	  (setq message-id (rmail-get-header "message-id")
		from (rmail-get-header "from")
		to (rmail-get-header "to")
		subject (rmail-get-header "subject"))
	(save-window-excursion		; Emacs 22
	  (save-restriction
	    (when (eq major-mode 'rmail-summary-mode)
	      (rmail-show-message rmail-current-message))
	    (with-no-warnings	  ; don't warn when compiling Emacs 23
	      (rmail-narrow-to-non-pruned-header))
	    (setq message-id (mail-fetch-field "message-id")
		  from (mail-fetch-field "from")
		  to (mail-fetch-field "to")
		  subject (mail-fetch-field "subject"))
	    (rmail-show-message rmail-current-message))))
      (org-store-link-props
       :type "rmail" :from from :to to
       :subject subject :message-id message-id)
      (setq message-id (org-remove-angle-brackets message-id))
      (setq desc (org-email-link-description))
      (setq link (org-make-link "rmail:"
				(with-current-buffer rmail-buffer
				  buffer-file-name)
				"#" message-id))
      (org-add-link-props :link link :description desc)
      link)))

(defun org-rmail-open (path)
  "Follow an Rmail message link to the specified PATH."
  (let (folder article)
    (if (not (string-match "\\`\\([^#]+\\)\\(#\\(.*\\)\\)?" path))
	(error "Error in Rmail link"))
    (setq folder (match-string 1 path)
	  article (match-string 3 path))
    (org-rmail-follow-link folder article)))

(defun org-rmail-follow-link (folder article)
  "Follow an Rmail link to FOLDER and ARTICLE."
  (require 'rmail)
  (setq article (org-add-angle-brackets article))
  (let (message-number buff)
    (save-excursion
      (save-window-excursion
	(rmail (if (string= folder "RMAIL") rmail-file-name folder))
	(setq buff (current-buffer)
	      message-number
	      (with-current-buffer
		  (if (and (fboundp 'rmail-buffers-swapped-p)
			   (rmail-buffers-swapped-p))
		      rmail-view-buffer
		    (current-buffer))
		(save-restriction
		  (widen)
		  (goto-char (point-max))
		  (if (re-search-backward
		       (concat "^Message-ID:\\s-+" (regexp-quote
						    (or article "")))
		       nil t)
		      ;; This is an rmail "debugging" function. :(
		      (with-current-buffer buff
			(rmail-what-message))))))))
    (if message-number
	(progn
	  (rmail (if (string= folder "RMAIL") rmail-file-name folder))
	  (rmail-show-message message-number)
	  message-number)
      (error "Message not found"))))

(provide 'org-rmail)

;; arch-tag: c6cf4a8b-6639-4b7f-821f-bdf10746b173

;;; org-rmail.el ends here