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;;; piem-notmuch.el --- Notmuch integration for piem -*- lexical-binding: t; -*-
;; Copyright (C) 2020 Kyle Meyer
;; Author: Kyle Meyer <kyle@kyleam.com>
;; Keywords: vc, tools
;; Version: 0.0.0
;; 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:
;;
;;; Code:
(require 'notmuch)
(require 'piem)
(require 'subr-x)
(defmacro piem-notmuch--with-current-message (&rest body)
(let ((rv (make-symbol "rv")))
`(let (,rv)
(with-current-notmuch-show-message
(setq ,rv ,(macroexp-progn body)))
,rv)))
(defun piem-notmuch-get-inbox ()
"Return inbox name from a `notmuch-show-mode' buffer."
(when (derived-mode-p 'notmuch-show-mode)
(piem-notmuch--with-current-message
(piem-inbox-by-header-match))))
(defun piem-notmuch-get-mid ()
"Return the message ID of a `notmuch-show-mode' buffer."
(notmuch-show-get-message-id 'bare))
(defun piem-notmuch-mid-to-thread (mid)
"Return a function that inserts an mbox for MID's thread."
(let ((query (concat "id:" mid)))
(when (equal query
(string-trim-right
(with-output-to-string
(with-current-buffer standard-output
(call-process notmuch-command
nil '(t nil) nil
"search" "--output=messages" query)))))
(lambda ()
(call-process notmuch-command
nil '(t nil) nil
"show" "--format=mbox" "--entire-thread=true"
query)))))
(defun piem-notmuch-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 'notmuch-show-mode)
(let ((body (car (plist-get (notmuch-show-get-message-properties)
:body))))
(pcase (plist-get body :content-type)
((and "text/plain"
(guard (string-match-p piem-patch-subject-re
(notmuch-show-get-subject))))
(let ((id (notmuch-show-get-message-id)))
(lambda ()
(call-process notmuch-command nil t nil
"show" "--format=mbox" id))))
("multipart/mixed"
(let ((patches
(delq nil
(mapcar (lambda (part)
(and (member (plist-get part :content-type)
'("text/x-diff" "text/x-patch"))
(plist-get part :content)))
(plist-get body :content)))))
(when patches
(lambda ()
(dolist (patch patches)
(insert patch))))))))))
;;;###autoload
(define-minor-mode piem-notmuch-mode
"Toggle Notmuch support for piem.
With a prefix argument ARG, enable piem-notmuch 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-notmuch-mode
(progn
(add-hook 'piem-am-ready-mbox-functions #'piem-notmuch-am-ready-mbox)
(add-hook 'piem-get-inbox-functions #'piem-notmuch-get-inbox)
(add-hook 'piem-get-mid-functions #'piem-notmuch-get-mid)
(add-hook 'piem-mid-to-thread-functions #'piem-notmuch-mid-to-thread))
(remove-hook 'piem-am-ready-mbox-functions #'piem-notmuch-am-ready-mbox)
(remove-hook 'piem-get-inbox-functions #'piem-notmuch-get-inbox)
(remove-hook 'piem-get-mid-functions #'piem-notmuch-get-mid)
(remove-hook 'piem-mid-to-thread-functions #'piem-notmuch-mid-to-thread)))
;;; piem-notmuch.el ends here
(provide 'piem-notmuch)
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