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;;; piem-gnus.el --- Gnus integration for piem -*- lexical-binding: t; -*-
;; Copyright (C) 2020 Kyle Meyer
;; 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-gnus-mode', that modifies
;; `piem' variables to teach functions like `piem-inbox' and
;; `piem-am-ready-mbox' how to extract information from Gnus buffers.
;;; Code:
(require 'gnus)
(require 'gnus-sum)
(require 'message)
(require 'piem)
(defgroup piem-gnus nil
"Gnus integration for piem."
:group 'piem)
(defun piem-gnus-get-inbox ()
"Return inbox name from a Gnus article"
(when (derived-mode-p 'gnus-article-mode 'gnus-summary-mode)
(with-current-buffer gnus-original-article-buffer
(piem-inbox-by-header-match))))
(defun piem-gnus-get-mid ()
"Return the message ID of a Gnus article."
(when (derived-mode-p 'gnus-article-mode 'gnus-summary-mode)
(with-current-buffer gnus-original-article-buffer
(when-let ((mid (message-field-value "Message-ID")))
(if (string-match (rx string-start (zero-or-more space) "<"
(group (one-or-more (not (any ">"))))
">" (zero-or-more space) string-end)
mid)
(match-string 1 mid)
mid)))))
;; If there is an easy way to generate an mbox for a thread in Gnus, a
;; function for `piem-mid-to-thread-functions' should be defined.
(defun piem-gnus-am-ready-mbox ()
"Return a function that inserts an am-ready mbox.
If the buffer has any MIME parts that look like a patch, use
those parts' contents (in order) as the mbox. Otherwise, use the
message itself if it looks like a patch."
(when (derived-mode-p 'gnus-article-mode 'gnus-summary-mode)
(cond
(gnus-article-mime-handles
(when-let ((patches
(delq nil
(mapcar (lambda (handle)
(and (listp handle)
(piem-am-patch-attachment-p
(mm-handle-media-type handle)
(mm-handle-filename handle))
(with-temp-buffer
(mm-display-inline handle)
(buffer-substring-no-properties
(point-min) (point-max)))))
gnus-article-mime-handles))))
(cons (lambda ()
(dolist (patch patches)
(insert patch)))
"mbox")))
(gnus-article-buffer
(when-let ((patch (with-current-buffer gnus-article-buffer
(save-restriction
(widen)
(and (string-match-p piem-patch-subject-re
(message-field-value "subject"))
(buffer-substring-no-properties
(point-min) (point-max)))))))
(cons (lambda () (insert patch))
"mbox"))))))
;;;###autoload
(define-minor-mode piem-gnus-mode
"Toggle Gnus support for piem.
With a prefix argument ARG, enable piem-gnus 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-gnus-mode
(progn
(add-hook 'piem-am-ready-mbox-functions #'piem-gnus-am-ready-mbox)
(add-hook 'piem-get-inbox-functions #'piem-gnus-get-inbox)
(add-hook 'piem-get-mid-functions #'piem-gnus-get-mid))
(remove-hook 'piem-am-ready-mbox-functions #'piem-gnus-am-ready-mbox)
(remove-hook 'piem-get-inbox-functions #'piem-gnus-get-inbox)
(remove-hook 'piem-get-mid-functions #'piem-gnus-get-mid)))
;;; piem-gnus.el ends here
(provide 'piem-gnus)
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