lisp/org-mhe.el

   1 ;;; org-mhe.el --- Support for links to MH-E messages from within Org-mode
   2
   3 ;; Copyright (C) 2004-2016 Free Software Foundation, Inc.
   4
   5 ;; Author: Thomas Baumann <thomas dot baumann at ch dot tum dot de>
   6 ;; Keywords: outlines, hypermedia, calendar, wp
   7 ;; Homepage: http://orgmode.org
   8 ;;
   9 ;; This file is part of GNU Emacs.
  10 ;;
  11 ;; GNU Emacs is free software: you can redistribute it and/or modify
  12 ;; it under the terms of the GNU General Public License as published by
  13 ;; the Free Software Foundation, either version 3 of the License, or
  14 ;; (at your option) any later version.
  15
  16 ;; GNU Emacs is distributed in the hope that it will be useful,
  17 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  18 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19 ;; GNU General Public License for more details.
  20
  21 ;; You should have received a copy of the GNU General Public License
  22 ;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
  23 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
  24 ;;
  25 ;;; Commentary:
  26
  27 ;; This file implements links to MH-E messages from within Org-mode.
  28 ;; Org-mode loads this module by default - if this is not what you want,
  29 ;; configure the variable `org-modules'.
  30
  31 ;;; Code:
  32
  33 (require 'org-macs)
  34 (require 'org)
  35
  36 ;; Customization variables
  37
  38 (defcustom org-mhe-search-all-folders nil
  39   "Non-nil means the search for the mh-message may extend to all folders.
  40 When non-nil, the search for a message will extend to all other
  41 folders if it cannot be found in the folder given in the link.
  42 Searching all folders may be slow with the default pick based
  43 search but is very efficient with one of the other search engines
  44 supported by MH-E."
  45   :group 'org-link-follow
  46   :type 'boolean)
  47
  48 ;; Declare external functions and variables
  49 (declare-function mh-display-msg "mh-show" (msg-num folder-name))
  50 (declare-function mh-find-path "mh-utils" ())
  51 (declare-function mh-get-header-field "mh-utils" (field))
  52 (declare-function mh-get-msg-num "mh-utils" (error-if-no-message))
  53 (declare-function mh-header-display "mh-show" ())
  54 (declare-function mh-index-previous-folder "mh-search" ())
  55 (declare-function mh-normalize-folder-name "mh-utils"
  56                   (folder &optional empty-string-okay dont-remove-trailing-slash
  57                           return-nil-if-folder-empty))
  58 (declare-function mh-search "mh-search"
  59                   (folder search-regexp &optional redo-search-flag
  60                           window-config))
  61 (declare-function mh-search-choose "mh-search" (&optional searcher))
  62 (declare-function mh-show "mh-show" (&optional message redisplay-flag))
  63 (declare-function mh-show-buffer-message-number "mh-comp" (&optional buffer))
  64 (declare-function mh-show-header-display "mh-show" t t)
  65 (declare-function mh-show-msg "mh-show" (msg))
  66 (declare-function mh-show-show "mh-show" t t)
  67 (declare-function mh-visit-folder "mh-folder" (folder &optional
  68                                                       range index-data))
  69 (defvar mh-progs)
  70 (defvar mh-current-folder)
  71 (defvar mh-show-folder-buffer)
  72 (defvar mh-index-folder)
  73 (defvar mh-searcher)
  74 (defvar mh-search-regexp-builder)
  75
  76 ;; Install the link type
  77 (org-add-link-type "mhe" 'org-mhe-open)
  78 (add-hook 'org-store-link-functions 'org-mhe-store-link)
  79
  80 ;; Implementation
  81 (defun org-mhe-store-link ()
  82   "Store a link to an MH-E folder or message."
  83   (when (or (equal major-mode 'mh-folder-mode)
  84             (equal major-mode 'mh-show-mode))
  85     (save-window-excursion
  86       (let* ((from (org-mhe-get-header "From:"))
  87              (to (org-mhe-get-header "To:"))
  88              (message-id (org-mhe-get-header "Message-Id:"))
  89              (subject (org-mhe-get-header "Subject:"))
  90              (date (org-mhe-get-header "Date:"))
  91              (date-ts (and date (format-time-string
  92                                  (org-time-stamp-format t) (date-to-time date))))
  93              (date-ts-ia (and date (format-time-string
  94                                     (org-time-stamp-format t t)
  95                                     (date-to-time date))))
  96              link desc)
  97         (org-store-link-props :type "mh" :from from :to to
  98                               :subject subject :message-id message-id)
  99         (when date
 100           (org-add-link-props :date date :date-timestamp date-ts
 101                               :date-timestamp-inactive date-ts-ia))
 102         (setq desc (org-email-link-description))
 103         (setq link (concat "mhe:" (org-mhe-get-message-real-folder) "#"
 104                            (org-remove-angle-brackets message-id)))
 105         (org-add-link-props :link link :description desc)
 106         link))))
 107
 108 (defun org-mhe-open (path)
 109   "Follow an MH-E message link specified by PATH."
 110   (let (folder article)
 111     (if (not (string-match "\\`\\([^#]+\\)\\(#\\(.*\\)\\)?" path))
 112         (error "Error in MH-E link"))
 113     (setq folder (match-string 1 path)
 114           article (match-string 3 path))
 115     (org-mhe-follow-link folder article)))
 116
 117 ;;; mh-e integration based on planner-mode
 118 (defun org-mhe-get-message-real-folder ()
 119   "Return the name of the real folder for the current message.
 120 So if you use sequences, it will now work."
 121   (save-excursion
 122     (let* ((folder
 123             (if (equal major-mode 'mh-folder-mode)
 124                 mh-current-folder
 125               ;; Refer to the show buffer
 126               mh-show-folder-buffer))
 127            (end-index
 128             (if (boundp 'mh-index-folder)
 129                 (min (length mh-index-folder) (length folder))))
 130            )
 131       ;; a simple test on mh-index-data does not work, because
 132       ;; mh-index-data is always nil in a show buffer.
 133       (if (and (boundp 'mh-index-folder)
 134                (string= mh-index-folder (substring folder 0 end-index)))
 135           (if (equal major-mode 'mh-show-mode)
 136               (save-window-excursion
 137                 (let (pop-up-frames)
 138                   (when (buffer-live-p (get-buffer folder))
 139                     (progn
 140                       (pop-to-buffer folder)
 141                       (org-mhe-get-message-folder-from-index)
 142                       )
 143                     )))
 144             (org-mhe-get-message-folder-from-index)
 145             )
 146         folder
 147         )
 148       )))
 149
 150 (defun org-mhe-get-message-folder-from-index ()
 151   "Return the name of the message folder in an index folder buffer."
 152   (save-excursion
 153     (mh-index-previous-folder)
 154     (if (re-search-forward "^\\(+.*\\)$" nil t)
 155         (message "%s" (match-string 1)))))
 156
 157 (defun org-mhe-get-message-folder ()
 158   "Return the name of the current message folder.
 159 Be careful if you use sequences."
 160   (save-excursion
 161     (if (equal major-mode 'mh-folder-mode)
 162         mh-current-folder
 163       ;; Refer to the show buffer
 164       mh-show-folder-buffer)))
 165
 166 (defun org-mhe-get-message-num ()
 167   "Return the number of the current message.
 168 Be careful if you use sequences."
 169   (save-excursion
 170     (if (equal major-mode 'mh-folder-mode)
 171         (mh-get-msg-num nil)
 172       ;; Refer to the show buffer
 173       (mh-show-buffer-message-number))))
 174
 175 (defun org-mhe-get-header (header)
 176   "Return the field for HEADER of the message in folder mode.
 177 This will create a show buffer for the corresponding message.  If
 178 you have a better idea of how to do this then please let us know."
 179   (let* ((folder (org-mhe-get-message-folder))
 180          (num (org-mhe-get-message-num))
 181          (buffer (get-buffer-create (concat "show-" folder)))
 182          (header-field))
 183     (with-current-buffer buffer
 184       (mh-display-msg num folder)
 185       (if (equal major-mode 'mh-folder-mode)
 186           (mh-header-display)
 187         (mh-show-header-display))
 188       (set-buffer buffer)
 189       (setq header-field (mh-get-header-field header))
 190       (if (equal major-mode 'mh-folder-mode)
 191           (mh-show)
 192         (mh-show-show))
 193       (org-trim header-field))))
 194
 195 (defun org-mhe-follow-link (folder article)
 196   "Follow an MH-E link to FOLDER and ARTICLE.
 197 If ARTICLE is nil FOLDER is shown.  If the configuration variable
 198 `org-mhe-search-all-folders' is t and `mh-searcher' is pick,
 199 ARTICLE is searched in all folders.  Indexed searches (swish++,
 200 namazu, and others supported by MH-E) will always search in all
 201 folders."
 202   (require 'mh-e)
 203   (require 'mh-search)
 204   (require 'mh-utils)
 205   (mh-find-path)
 206   (if (not article)
 207       (mh-visit-folder (mh-normalize-folder-name folder))
 208     (mh-search-choose)
 209     (if (equal mh-searcher 'pick)
 210         (progn
 211           (setq article (org-add-angle-brackets article))
 212           (mh-search folder (list "--message-id" article))
 213           (when (and org-mhe-search-all-folders
 214                      (not (org-mhe-get-message-real-folder)))
 215             (kill-this-buffer)
 216             (mh-search "+" (list "--message-id" article))))
 217       (if mh-search-regexp-builder
 218           (mh-search "+" (funcall mh-search-regexp-builder
 219                                   (list (cons 'message-id article))))
 220         (mh-search "+" article)))
 221     (if (org-mhe-get-message-real-folder)
 222         (mh-show-msg 1)
 223       (kill-this-buffer)
 224       (error "Message not found"))))
 225
 226 (provide 'org-mhe)
 227
 228 ;;; org-mhe.el ends here