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;;; piem-rmail.el --- Rmail integration for piem -*- lexical-binding: t; -*-
;; Copyright (C) 2021 all contributors <piem@inbox.kyleam.com>
;; Author: Kyle Meyer <kyle@kyleam.com>
;; Keywords: vc, tools
;; Package-Requires: ((emacs "26.3"))
;; This program 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.
;; This program 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 this program. If not, see <https://www.gnu.org/licenses/>.
;;; Commentary:
;; This library provides a minor mode, `piem-rmail-mode', that
;; modifies `piem' variables to teach functions like `piem-inbox' how
;; to extract information from Rmail mode buffers.
;;; Code:
(require 'piem)
(require 'rmail)
(defgroup piem-rmail nil
"Rmail integration for piem."
:group 'piem)
(defun piem-rmail--call-with-message (fn)
(when (derived-mode-p 'rmail-mode 'rmail-summary-mode)
(rmail-apply-in-message
rmail-current-message
(lambda ()
(search-forward "\n\n" nil 'move)
(narrow-to-region (point-min) (point))
(funcall fn)))))
(defun piem-rmail-get-inbox ()
"Return inbox name from an Rmail buffer."
(piem-rmail--call-with-message #'piem-inbox-by-header-match))
(defun piem-rmail-get-mid ()
"Return the message ID of an Rmail buffer."
(when-let ((mid (piem-rmail--call-with-message
(lambda () (mail-fetch-field "message-id")))))
(replace-regexp-in-string "\\`<\\(.*\\)>\\'" "\\1" mid)))
;;;###autoload
(define-minor-mode piem-rmail-mode
"Toggle Rmail support for piem.
With a prefix argument ARG, enable piem-rmail mode if ARG is
positive, and disable it otherwise. If called from Lisp, enable
the mode if ARG is omitted or nil."
:global t
:init-value nil
(if piem-rmail-mode
(progn
(add-hook 'piem-get-inbox-functions #'piem-rmail-get-inbox)
(add-hook 'piem-get-mid-functions #'piem-rmail-get-mid))
(remove-hook 'piem-get-inbox-functions #'piem-rmail-get-inbox)
(remove-hook 'piem-get-mid-functions #'piem-rmail-get-mid)))
;;; piem-rmail.el ends here
(provide 'piem-rmail)
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