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+;;; ol-rmail.el --- Links to Rmail Messages -*- lexical-binding: t; -*-
+
+;; Copyright (C) 2004-2021 Free Software Foundation, Inc.
+
+;; Author: Carsten Dominik <carsten.dominik@gmail.com>
+;; Keywords: outlines, hypermedia, calendar, wp
+;; Homepage: https://orgmode.org
+;;
+;; 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 <https://www.gnu.org/licenses/>.
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;;
+;;; Commentary:
+
+;; This file implements links to Rmail 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 'ol)
+
+;; Declare external functions and variables
+(declare-function rmail-show-message "rmail" (&optional n no-summary))
+(declare-function rmail-what-message "rmail" (&optional pos))
+(declare-function rmail-toggle-header "rmail" (&optional arg))
+(declare-function rmail "rmail" (&optional file-name-arg))
+(declare-function rmail-widen "rmail" ())
+(defvar rmail-current-message) ; From rmail.el
+(defvar rmail-header-style) ; From rmail.el
+(defvar rmail-file-name) ; From rmail.el
+
+;; Install the link type
+(org-link-set-parameters "rmail"
+ :follow #'org-rmail-open
+ :store #'org-rmail-store-link)
+
+;; Implementation
+(defun org-rmail-store-link ()
+ "Store a link to an Rmail folder or message."
+ (when (or (eq major-mode 'rmail-mode)
+ (eq major-mode 'rmail-summary-mode))
+ (save-window-excursion
+ (save-restriction
+ (when (eq major-mode 'rmail-summary-mode)
+ (rmail-show-message rmail-current-message))
+ (when (fboundp 'rmail-narrow-to-non-pruned-header)
+ (rmail-narrow-to-non-pruned-header))
+ (when (eq rmail-header-style 'normal)
+ (rmail-toggle-header -1))
+ (let* ((folder buffer-file-name)
+ (message-id (mail-fetch-field "message-id"))
+ (from (mail-fetch-field "from"))
+ (to (mail-fetch-field "to"))
+ (subject (mail-fetch-field "subject"))
+ (date (mail-fetch-field "date"))
+ desc link)
+ (org-link-store-props
+ :type "rmail" :from from :to to :date date
+ :subject subject :message-id message-id)
+ (setq message-id (org-unbracket-string "<" ">" message-id))
+ (setq desc (org-link-email-description))
+ (setq link (concat "rmail:" folder "#" message-id))
+ (org-link-add-props :link link :description desc)
+ (rmail-show-message rmail-current-message)
+ link)))))
+
+(defun org-rmail-open (path _)
+ "Follow an Rmail message link to the specified PATH."
+ (let (folder article)
+ (if (not (string-match "\\`\\([^#]+\\)\\(#\\(.*\\)\\)?" path))
+ (error "Error in Rmail link"))
+ (setq folder (match-string 1 path)
+ article (match-string 3 path))
+ (org-rmail-follow-link folder article)))
+
+(defun org-rmail-follow-link (folder article)
+ "Follow an Rmail link to FOLDER and ARTICLE."
+ (require 'rmail)
+ (cond ((null article) (setq article ""))
+ ((stringp article)
+ (setq article (org-link-add-angle-brackets article)))
+ (t (user-error "Wrong RMAIL link format")))
+ (let (message-number)
+ (save-excursion
+ (save-window-excursion
+ (rmail (if (string= folder "RMAIL") rmail-file-name folder))
+ (setq message-number
+ (save-restriction
+ (rmail-widen)
+ (goto-char (point-max))
+ (if (re-search-backward
+ (concat "^Message-ID:\\s-+" (regexp-quote article))
+ nil t)
+ (rmail-what-message))))))
+ (if message-number
+ (progn
+ (rmail (if (string= folder "RMAIL") rmail-file-name folder))
+ (rmail-show-message message-number)
+ message-number)
+ (error "Message not found"))))
+
+(provide 'ol-rmail)
+
+;;; ol-rmail.el ends here