lisp/ol-mhe.el

   1 ;;; ol-mhe.el --- Links to MH-E Messages             -*- lexical-binding: t; -*-
   2
   3 ;; Copyright (C) 2004-2019 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: https://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 <https://www.gnu.org/licenses/>.
  23 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
  24 ;;
  25 ;;; Commentary:
  26
  27 ;; This file implements links to MH-E messages from within Org.
  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 'ol)
  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-link-set-parameters "mhe" :follow #'org-mhe-open :store #'org-mhe-store-link)
  78
  79 ;; Implementation
  80 (defun org-mhe-store-link ()
  81   "Store a link to an MH-E folder or message."
  82   (when (or (eq major-mode 'mh-folder-mode)
  83             (eq major-mode 'mh-show-mode))
  84     (save-window-excursion
  85       (let* ((from (org-mhe-get-header "From:"))
  86              (to (org-mhe-get-header "To:"))
  87              (message-id (org-mhe-get-header "Message-Id:"))
  88              (subject (org-mhe-get-header "Subject:"))
  89              (date (org-mhe-get-header "Date:"))
  90              link desc)
  91         (org-link-store-props :type "mh" :from from :to to :date date
  92                               :subject subject :message-id message-id)
  93         (setq desc (org-link-email-description))
  94         (setq link (concat "mhe:" (org-mhe-get-message-real-folder) "#"
  95                            (org-unbracket-string "<" ">" message-id)))
  96         (org-link-add-props :link link :description desc)
  97         link))))
  98
  99 (defun org-mhe-open (path)
 100   "Follow an MH-E message link specified by PATH."
 101   (let (folder article)
 102     (if (not (string-match "\\`\\([^#]+\\)\\(#\\(.*\\)\\)?" path))
 103         (error "Error in MH-E link"))
 104     (setq folder (match-string 1 path)
 105           article (match-string 3 path))
 106     (org-mhe-follow-link folder article)))
 107
 108 ;;; mh-e integration based on planner-mode
 109 (defun org-mhe-get-message-real-folder ()
 110   "Return the name of the real folder for the current message.
 111 So if you use sequences, it will now work."
 112   (save-excursion
 113     (let* ((folder
 114             (if (eq major-mode 'mh-folder-mode)
 115                 mh-current-folder
 116               ;; Refer to the show buffer
 117               mh-show-folder-buffer))
 118            (end-index
 119             (if (boundp 'mh-index-folder)
 120                 (min (length mh-index-folder) (length folder))))
 121            )
 122       ;; a simple test on mh-index-data does not work, because
 123       ;; mh-index-data is always nil in a show buffer.
 124       (if (and (boundp 'mh-index-folder)
 125                (string= mh-index-folder (substring folder 0 end-index)))
 126           (if (eq major-mode 'mh-show-mode)
 127               (save-window-excursion
 128                 (let (pop-up-frames)
 129                   (when (buffer-live-p (get-buffer folder))
 130                     (progn
 131                       (pop-to-buffer folder)
 132                       (org-mhe-get-message-folder-from-index)
 133                       )
 134                     )))
 135             (org-mhe-get-message-folder-from-index)
 136             )
 137         folder
 138         )
 139       )))
 140
 141 (defun org-mhe-get-message-folder-from-index ()
 142   "Return the name of the message folder in an index folder buffer."
 143   (save-excursion
 144     (mh-index-previous-folder)
 145     (if (re-search-forward "^\\(\\+.*\\)$" nil t)
 146         (message "%s" (match-string 1)))))
 147
 148 (defun org-mhe-get-message-folder ()
 149   "Return the name of the current message folder.
 150 Be careful if you use sequences."
 151   (save-excursion
 152     (if (eq major-mode 'mh-folder-mode)
 153         mh-current-folder
 154       ;; Refer to the show buffer
 155       mh-show-folder-buffer)))
 156
 157 (defun org-mhe-get-message-num ()
 158   "Return the number of the current message.
 159 Be careful if you use sequences."
 160   (save-excursion
 161     (if (eq major-mode 'mh-folder-mode)
 162         (mh-get-msg-num nil)
 163       ;; Refer to the show buffer
 164       (mh-show-buffer-message-number))))
 165
 166 (defun org-mhe-get-header (header)
 167   "Return the field for HEADER of the message in folder mode.
 168 This will create a show buffer for the corresponding message.  If
 169 you have a better idea of how to do this then please let us know."
 170   (let* ((folder (org-mhe-get-message-folder))
 171          (num (org-mhe-get-message-num))
 172          (buffer (get-buffer-create (concat "show-" folder)))
 173          (header-field))
 174     (with-current-buffer buffer
 175       (mh-display-msg num folder)
 176       (if (eq major-mode 'mh-folder-mode)
 177           (mh-header-display)
 178         (mh-show-header-display))
 179       (set-buffer buffer)
 180       (setq header-field (mh-get-header-field header))
 181       (if (eq major-mode 'mh-folder-mode)
 182           (mh-show)
 183         (mh-show-show))
 184       (org-trim header-field))))
 185
 186 (defun org-mhe-follow-link (folder article)
 187   "Follow an MH-E link to FOLDER and ARTICLE.
 188 If ARTICLE is nil FOLDER is shown.  If the configuration variable
 189 `org-mhe-search-all-folders' is t and `mh-searcher' is pick,
 190 ARTICLE is searched in all folders.  Indexed searches (swish++,
 191 namazu, and others supported by MH-E) will always search in all
 192 folders."
 193   (require 'mh-e)
 194   (require 'mh-search)
 195   (require 'mh-utils)
 196   (mh-find-path)
 197   (if (not article)
 198       (mh-visit-folder (mh-normalize-folder-name folder))
 199     (mh-search-choose)
 200     (if (eq mh-searcher 'pick)
 201         (progn
 202           (setq article (org-link-add-angle-brackets article))
 203           (mh-search folder (list "--message-id" article))
 204           (when (and org-mhe-search-all-folders
 205                      (not (org-mhe-get-message-real-folder)))
 206             (kill-buffer)
 207             (mh-search "+" (list "--message-id" article))))
 208       (if mh-search-regexp-builder
 209           (mh-search "+" (funcall mh-search-regexp-builder
 210                                   (list (cons 'message-id article))))
 211         (mh-search "+" article)))
 212     (if (org-mhe-get-message-real-folder)
 213         (mh-show-msg 1)
 214       (kill-buffer)
 215       (error "Message not found"))))
 216
 217 (provide 'ol-mhe)
 218
 219 ;;; ol-mhe.el ends here