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;;; piem-rmail.el --- Rmail integration for piem  -*- lexical-binding: t; -*-

;; Copyright (C) 2020-2021  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)
debug log:

solving ccb9432 ...
found ccb9432 in https://inbox.kyleam.com/piem/20210527213001.5265-1-kyle@kyleam.com/ ||
	https://inbox.kyleam.com/piem/20210527232714.8726-1-kyle@kyleam.com/

applying [1/2] https://inbox.kyleam.com/piem/20210527213001.5265-1-kyle@kyleam.com/
diff --git a/piem-rmail.el b/piem-rmail.el
new file mode 100644
index 0000000..ccb9432

Checking patch piem-rmail.el...
Applied patch piem-rmail.el cleanly.

skipping https://inbox.kyleam.com/piem/20210527232714.8726-1-kyle@kyleam.com/ for ccb9432
index at:
100644 ccb9432700d2f4444cb62581d15ec34ed01c8e50	piem-rmail.el

discussion and development of piem

This inbox may be cloned and mirrored by anyone:

	git clone --mirror https://inbox.kyleam.com/piem/0 piem/git/0.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 piem piem/ https://inbox.kyleam.com/piem \
		piem@inbox.kyleam.com
	public-inbox-index piem

Example config snippet for mirrors.
Newsgroup available over NNTP:
	nntp://news.yhetil.org/yhetil.emacs.piem


code repositories for project(s) associated with this inbox:

	https://git.kyleam.com/piem/

AGPL code for this site: git clone http://ou63pmih66umazou.onion/public-inbox.git