;;; org-mew.el --- Support for links to Mew messages from within Org-mode

;; Copyright (C) 2008 Free Software Foundation, Inc.

;; Author: Tokuya Kameshima <kames at fa2 dot so-net dot ne dot jp>
;; Keywords: outlines, hypermedia, calendar, wp
;; Homepage: http://orgmode.org
;; Version: 6.06b

;; 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 Mew 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)

(defgroup org-mew nil
"Options concerning the Mew link."
:tag "Org Startup"
:group 'org-link)

(defcustom org-mew-link-to-refile-destination t
"Create a link to the refile destination if the message is marked as refile."
:group 'org-mew
:type 'boolean)

;; Declare external functions and variables
(declare-function mew-cache-hit "ext:mew-cache" (fld msg &optional must-hit))
(declare-function mew-header-get-value "ext:mew-header"
                 (field &optional as-list))
(declare-function mew-init "ext:mew" ())
(declare-function mew-refile-get "ext:mew-refile" (msg))
(declare-function mew-summary-display "ext:mew-summary2" (&optional redisplay))
(declare-function mew-summary-folder-name "ext:mew-syntax" (&optional ext))
(declare-function mew-summary-get-mark "ext:mew-mark" ())
(declare-function mew-summary-message-number2 "ext:mew-syntax" ())
(declare-function mew-summary-pick-with-mewl "ext:mew-pick"
                 (pattern folder src-msgs))
(declare-function mew-summary-search-msg "ext:mew-const" (msg))
(declare-function mew-summary-set-message-buffer "ext:mew-summary3" (fld msg))
(declare-function mew-summary-visit-folder "ext:mew-summary4"
                 (folder &optional goend no-ls))
(declare-function mew-window-push "ext:mew" ())
(defvar mew-init-p)
(defvar mew-summary-goto-line-then-display)

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

;; Implementation
(defun org-mew-store-link ()
"Store a link to a Mew folder or message."
(when (memq major-mode '(mew-summary-mode mew-virtual-mode))
  (let* ((msgnum (mew-summary-message-number2))
          (mark-info (mew-summary-get-mark))
          (folder-name
           (if (and org-mew-link-to-refile-destination
                    (eq mark-info ?o)) ; marked as refile
               (nth 1 (mew-refile-get msgnum))
             (mew-summary-folder-name)))
          message-id from to subject desc link)
    (save-window-excursion
       (if (fboundp 'mew-summary-set-message-buffer)
           (mew-summary-set-message-buffer folder-name msgnum)
         (set-buffer (mew-cache-hit folder-name msgnum t)))
       (setq message-id (mew-header-get-value "Message-Id:"))
       (setq from (mew-header-get-value "From:"))
       (setq to (mew-header-get-value "To:"))
       (setq subject (mew-header-get-value "Subject:")))
    (org-store-link-props :type "mew" :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 "mew:" folder-name
                               "#" message-id))
    (org-add-link-props :link link :description desc)
    link)))

(defun org-mew-open (path)
"Follow the Mew message link specified by PATH."
(let (folder msgnum)
  (cond ((string-match "\\`\\(+.*\\)+\\+\\([0-9]+\\)\\'" path) ; for Bastien's
          (setq folder (match-string 1 path))
          (setq msgnum (match-string 2 path)))
         ((string-match "\\`\\(\\(%#\\)?[^#]+\\)\\(#\\(.*\\)\\)?" path)
          (setq folder (match-string 1 path))
          (setq msgnum (match-string 4 path)))
         (t (error "Error in Mew link")))
  (require 'mew)
  (mew-window-push)
  (unless mew-init-p (mew-init))
  (mew-summary-visit-folder folder)
  (when msgnum
    (if (not (string-match "\\`[0-9]+\\'" msgnum))
         (let* ((pattern (concat "message-id=" msgnum))
                (msgs (mew-summary-pick-with-mewl pattern folder nil)))
           (setq msgnum (car msgs))))
    (if (mew-summary-search-msg msgnum)
         (if mew-summary-goto-line-then-display
             (mew-summary-display))
       (error "Message not found")))))

(provide 'org-mew)

;; arch-tag: 07ccdca7-6020-4941-a593-588a1e51b870

;;; org-mew.el ends here