;;; git-email.el --- Work with git and email -*- lexical-binding: t; -*-

;; Copyright (C) 2021 yoctocell

;; Author: yoctocell <public@yoctocell.xyz>
;; URL: https://git.sr.ht/~yoctocell/git-email
;; Version: 0.1.0
;; Package-Requires: ((emacs "25.1"))
;; Keywords: git email
;; License: GNU General Public License >= 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:

;;; Code:

(defgroup git-email nil
  "Work with git and email."
  :group 'convenience)

(defcustom git-email--compose-message-function 'message-mail
  "The function used to compose patch mail."
  :group 'git-email
  :type 'symbol)

(defun git-email--extract-header (header patch-file)
  "Extract HEADER from PATCH-FILE."
  (with-temp-buffer
    (insert-file-contents patch-file)
    (goto-char (point-min))
    (buffer-substring-no-properties
     (re-search-forward (format " *%s: +" header))
     (point-at-eol))))

(defun git-email-send-email (patch-file)
  "Given a PATCH-FILE, send an email."
  (interactive)
  (let ((subject (git-email--extract-header "subject" patch-file))
	(from (git-email--extract-header "from" patch-file))
	(in-reply-to (git-email--extract-header "in-reply-to" patch-file))
	(msg-id (git-email--extract-header "message-id" patch-file)))
    (funcall git-email--compose-message-function "test" subject
					 `(("in-reply-to" ,in-reply-to)
					   ("message-id" ,msg-id)
					   ("from" ,from)))))

    
(provide 'git-email)
;;; git-email.el ends here