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+;;; 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: 7.4
+;;
+;; 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-disable-folder-check t
+  "Disable check for new messages when open a link."
+  :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-jump-to-msg "ext:wl-summary"
+		  (&optional number beg end))
+(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))
+(declare-function wl-folder-get-petname "ext:wl-folder" (name))
+(declare-function wl-folder-get-entity-from-buffer "ext:wl-folder"
+		  (&optional getid))
+(declare-function wl-folder-buffer-group-p "ext:wl-folder")
+(defvar wl-init)
+(defvar wl-summary-buffer-elmo-folder)
+(defvar wl-summary-buffer-folder-name)
+(defvar wl-folder-group-regexp)
+(defvar wl-auto-check-folder-name)
+(defvar elmo-nntp-default-server)
+
+(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 indicates 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-message-field (field entity)
+  "Return content of FIELD in ENTITY.
+FIELD is a symbol of a rfc822 message header field.
+ENTITY is a message entity."
+  (let ((content (elmo-message-entity-field entity field 'string)))
+    (if (listp content) (car content) content)))
+
+(defun org-wl-store-link ()
+  "Store a link to a WL message or folder."
+  (unless (eobp)
+    (cond
+     ((memq major-mode '(wl-summary-mode mime-view-mode))
+      (org-wl-store-link-message))
+     ((eq major-mode 'wl-folder-mode)
+      (org-wl-store-link-folder))
+     (t
+      nil))))
+
+(defun org-wl-store-link-folder ()
+  "Store a link to a WL folder."
+  (let* ((folder (wl-folder-get-entity-from-buffer))
+	 (petname (wl-folder-get-petname folder))
+	 (link (org-make-link "wl:" folder)))
+    (save-excursion
+      (beginning-of-line)
+      (unless (and (wl-folder-buffer-group-p)
+		   (looking-at wl-folder-group-regexp))
+	(org-store-link-props :type "wl" :description petname
+			      :link link)
+	link))))
+
+(defun org-wl-store-link-message ()
+  "Store a link to a WL message."
+  (save-excursion
+    (let ((buf (if (eq major-mode 'wl-summary-mode)
+		   (current-buffer)
+		 (and (boundp 'wl-message-buffer-cur-summary-buffer)
+		      wl-message-buffer-cur-summary-buffer))))
+      (when buf
+	(with-current-buffer buf
+	  (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))
+		 (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))))
+		 (message-id
+		  (org-wl-message-field 'message-id wl-message-entity))
+		 (message-id-no-brackets
+		  (org-remove-angle-brackets message-id))
+		 (from (org-wl-message-field 'from wl-message-entity))
+		 (to (org-wl-message-field 'to wl-message-entity))
+		 (xref (org-wl-message-field 'xref wl-message-entity))
+		 (subject (org-wl-message-field 'subject wl-message-entity))
+		 (date (org-wl-message-field 'date wl-message-entity))
+		 (date-ts (and date (format-time-string
+				     (org-time-stamp-format t)
+				     (date-to-time date))))
+		 (date-ts-ia (and date (format-time-string
+					(org-time-stamp-format t t)
+					(date-to-time date))))
+		 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
+				    :message-id-no-brackets message-id-no-brackets
+				    :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
+				    :message-id-no-brackets message-id-no-brackets
+				    :subject subject))
+	     (t
+	      (org-store-link-props :type "wl" :from from :to to
+				    :subject subject :message-id message-id
+				    :message-id-no-brackets message-id-no-brackets)
+	      (setq desc (org-email-link-description))
+	      (setq link (org-make-link "wl:" folder-name "#" message-id-no-brackets))
+	      (org-add-link-props :link link :description desc)))
+	    (when date
+	      (org-add-link-props :date date :date-timestamp date-ts
+				  :date-timestamp-inactive date-ts-ia))
+	    (or link xref)))))))
+
+(defun org-wl-open-nntp (path)
+  "Follow the nntp: link specified by PATH."
+  (let* ((spec (split-string path "/"))
+	 (server (split-string (nth 2 spec) "@"))
+	 (group (nth 3 spec))
+	 (article (nth 4 spec)))
+    (org-wl-open
+     (concat "-" group ":" (if (cdr server)
+			       (car (split-string (car server) ":"))
+			     "")
+	     (if (string= elmo-nntp-default-server (nth 2 spec))
+		 ""
+	       (concat "@" (or (cdr server) (car server))))
+	     (if article (concat "#" article) "")))))
+
+(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)
+  (let ((wl-auto-check-folder-name
+	 (if org-wl-disable-folder-check
+	     'none
+	   wl-auto-check-folder-name)))
+    (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)
+	(with-current-buffer old-buf
+	  ;; XXX: `wl-folder-goto-folder-subr' moves point to the
+	  ;; beginning of the current line.  So, restore the point
+	  ;; in the old buffer.
+	  (goto-char old-point))
+	(when article
+	  (if (org-string-match-p "@" article)
+	      (wl-summary-jump-to-msg-by-message-id (org-add-angle-brackets
+						     article))
+	    (or (wl-summary-jump-to-msg (string-to-number article))
+		(error "No such message: %s" article)))
+	     (wl-summary-redisplay))))))
+
+(provide 'org-wl)
+
+;; arch-tag: 29b75a0f-ef2e-430b-8abc-acff75bde54a
+
+;;; org-wl.el ends here