;;; org-wl.el --- Support for links to Wanderlust messages from within Org-mode

;; Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010
;;   Free Software Foundation, Inc.

;; Author: Tokuya Kameshima <kames at fa2 dot so-net dot ne dot jp>
;;      David Maus <dmaus at ictsoc dot de>
;; Keywords: outlines, hypermedia, calendar, wp
;; Homepage: http://orgmode.org
;; Version: 6.35g
;;
;; 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 Wanderlust 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-wl nil
 "Options concerning the Wanderlust link."
 :tag "Org Startup"
 :group 'org-link)

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

(defcustom org-wl-link-remove-filter nil
  "Remove filter condition if message is filter folder."
  :group 'org-wl
  :type 'boolean)

(defcustom org-wl-shimbun-prefer-web-links nil
  "If non-nil create web links for shimbun messages."
  :group 'org-wl
  :type 'boolean)

(defcustom org-wl-nntp-prefer-web-links nil
  "If non-nil create web links for nntp messages.
When folder name contains string \"gmane\" link to gmane,
googlegroups otherwise."
  :type 'boolean
  :group 'org-wl)

(defcustom org-wl-namazu-default-index nil
  "Default namazu search index."
  :type 'directory
  :group 'org-wl)

;; Declare external functions and variables
(declare-function elmo-folder-exists-p "ext:elmo" (folder) t)
(declare-function elmo-message-entity-field "ext:elmo-msgdb"
		  (entity field &optional type))
(declare-function elmo-message-field "ext:elmo"
		  (folder number field &optional type) t)
(declare-function elmo-msgdb-overview-get-entity "ext:elmo" (id msgdb) t)
;; Backward compatibility to old version of wl
(declare-function wl "ext:wl" () t)
(declare-function wl-summary-buffer-msgdb "ext:wl-folder" () t)
(declare-function wl-summary-jump-to-msg-by-message-id "ext:wl-summary"
		  (&optional id))
(declare-function wl-summary-line-from "ext:wl-summary" ())
(declare-function wl-summary-line-subject "ext:wl-summary" ())
(declare-function wl-summary-message-number "ext:wl-summary" ())
(declare-function wl-summary-redisplay "ext:wl-summary" (&optional arg))
(declare-function wl-summary-registered-temp-mark "ext:wl-action" (number))
(declare-function wl-folder-goto-folder-subr "ext:wl-folder"
		  (&optional folder sticky))
(defvar wl-init)
(defvar wl-summary-buffer-elmo-folder)
(defvar wl-summary-buffer-folder-name)

(defconst org-wl-folder-types
  '(("%" . imap) ("-" . nntp) ("+" . mh) ("=" . spool)
    ("$" . archive) ("&" . pop) ("@" . shimbun) ("[" . search)
    ("*" . multi) ("/" . filter) ("|" . pipe) ("'" . internal))
  "List of folder indicators. See Wanderlust manual, section 3.")

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

;; Implementation
(defun org-wl-folder-type (folder)
  "Return symbol that indicicates the type of FOLDER.
FOLDER is the wanderlust folder name. The first character of the
folder name determines the the folder type."
  (let* ((indicator (substring folder 0 1))
	 (type (cdr (assoc indicator org-wl-folder-types))))
    ;; maybe access or file folder
    (when (not type)
      (setq type
	    (cond
	     ((and (>= (length folder) 5)
		   (string= (substring folder 0 5) "file:"))
	      'file)
	     ((and (>= (length folder) 7)
		   (string= (substring folder 0 7) "access:"))
	      'access)
	     (t
	      nil))))
    type))

(defun org-wl-store-link ()
 "Store a link to a WL folder or message."
 (when (eq major-mode 'wl-summary-mode)
   (let* ((msgnum (wl-summary-message-number))
	   (mark-info (wl-summary-registered-temp-mark msgnum))
	   (folder-name
	    (if (and org-wl-link-to-refile-destination
		     mark-info
		     (equal (nth 1 mark-info) "o")) ; marked as refile
		(nth 2 mark-info)
	      wl-summary-buffer-folder-name))
	   (folder-type (org-wl-folder-type folder-name))
	   (message-id (elmo-message-field wl-summary-buffer-elmo-folder
					   msgnum 'message-id))
	   (wl-message-entity
	    (if (fboundp 'elmo-message-entity)
		(elmo-message-entity
		 wl-summary-buffer-elmo-folder msgnum)
	      (elmo-msgdb-overview-get-entity
	       msgnum (wl-summary-buffer-msgdb))))
	   (from (let ((from-field (elmo-message-entity-field wl-message-entity
							      'from)))
		   (if (listp from-field)
		       (car from-field)
		     from-field)))
	   (to (let ((to-field (elmo-message-entity-field wl-message-entity
							  'to)))
		 (if (listp to-field)
		     (car to-field)
		   to-field)))
	   (xref (let ((xref-field (elmo-message-entity-field wl-message-entity
							      'xref)))
		   (if (listp xref-field)
		       (car xref-field)
		     xref-field)))
	   (subject (let (wl-thr-indent-string wl-parent-message-entity)
		      (wl-summary-line-subject)))
	   desc link)

     ;; remove text properties of subject string to avoid possible bug
     ;; when formatting the subject
     ;; (Emacs bug #5306, fixed)
     (set-text-properties 0 (length subject) nil subject)

     ;; maybe remove filter condition
     (when (and (eq folder-type 'filter) org-wl-link-remove-filter)
       (while (eq (org-wl-folder-type folder-name) 'filter)
	 (setq folder-name
	       (replace-regexp-in-string "^/[^/]+/" "" folder-name))))

     ;; maybe create http link
     (cond
      ((and (eq folder-type 'shimbun) org-wl-shimbun-prefer-web-links xref)
       (org-store-link-props :type "http" :link xref :description subject
			     :from from :to to :message-id message-id
			     :subject subject))
      ((and (eq folder-type 'nntp) org-wl-nntp-prefer-web-links)
       (setq link (format
		   (if (string-match "gmane\\." folder-name)
		       "http://mid.gmane.org/%s"
		     "http://groups.google.com/groups/search?as_umsgid=%s")
		   (org-fixup-message-id-for-http message-id)))
       (org-store-link-props :type "http" :link link :description subject
			     :from from :to to :message-id message-id
			     :subject subject))
      (t
       (org-store-link-props :type "wl" :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 "wl:" folder-name "#" message-id))
       (org-add-link-props :link link :description desc)))
     (or link xref))))

(defun org-wl-open (path)
 "Follow the WL message link specified by PATH.
When called with one prefix, open message in namazu search folder
with `org-wl-namazu-default-index' as search index.  When called
with two prefixes or `org-wl-namazu-default-index' is nil, ask
for namazu index."
 (require 'wl)
 (unless wl-init (wl))
 ;; XXX: The imap-uw's MH folder names start with "%#".
 (if (not (string-match "\\`\\(\\(?:%#\\)?[^#]+\\)\\(#\\(.*\\)\\)?" path))
     (error "Error in Wanderlust link"))
 (let ((folder (match-string 1 path))
       (article (match-string 3 path)))
   ;; maybe open message in namazu search folder
   (when current-prefix-arg
     (setq folder (concat "[" article "]"
			  (if (and (equal current-prefix-arg '(4))
				   org-wl-namazu-default-index)
			      org-wl-namazu-default-index
			    (read-directory-name "Namazu index: ")))))
   (if (not (elmo-folder-exists-p (org-no-warnings
				   (wl-folder-get-elmo-folder folder))))
	(error "No such folder: %s" folder))
   (let ((old-buf (current-buffer))
	  (old-point (point-marker)))
     (wl-folder-goto-folder-subr folder)
     (save-excursion
	;; XXX: `wl-folder-goto-folder-subr' moves point to the
	;; beginning of the current line.  So, restore the point
	;; in the old buffer.
	(set-buffer old-buf)
	(goto-char old-point))
     (and (wl-summary-jump-to-msg-by-message-id (org-add-angle-brackets
						  article))
	   (wl-summary-redisplay)))))

(provide 'org-wl)

;; arch-tag: 29b75a0f-ef2e-430b-8abc-acff75bde54a

;;; org-wl.el ends here