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;;; piem-notmuch.el --- Notmuch integration for piem -*- lexical-binding: t; -*-
;; Copyright all piem contributors <piem@inbox.kyleam.com>
;; Copyright (C) 2019 Sean Whitton <spwhitton@spwhitton.name>
;; 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-notmuch-mode', that
;; modifies `piem' variables to teach functions like `piem-inbox' and
;; `piem-am-ready-mbox' how to extract information from Notmuch
;; buffers.
;;; Code:
(require 'mm-decode)
(require 'notmuch)
(require 'piem)
(require 'subr-x)
(defgroup piem-notmuch nil
"Notmuch integration for piem."
:group 'piem)
(defcustom piem-notmuch-extract-patch-executable "notmuch-extract-patch"
"Which notmuch-extract-patch executable to use."
:package-version '(piem . "0.4.0")
:type 'string)
(defmacro piem-notmuch--with-current-message (&rest body)
(declare (indent 0) (debug (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))
;;;###autoload
(defun piem-notmuch-known-mid-p (mid)
"Return non-nil if MID is known to Notmuch.
The message ID should not include Notmuch's \"id:\" prefix or
have surrounding brackets."
(let ((query (concat "id:" mid)))
(equal query
(string-trim-right
(with-output-to-string
(call-process notmuch-command
nil (list standard-output nil) nil
"search" "--output=messages" query))))))
(defun piem-notmuch-mid-to-thread (mid)
"Return a function that inserts an mbox for MID's thread."
(when (piem-notmuch-known-mid-p mid)
(lambda ()
(call-process notmuch-command
nil '(t nil) nil
"show" "--format=mbox" "--entire-thread=true"
(concat "id:" mid)))))
(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 as the mbox, ordering the patches based on
the number at the start of the file name. If none of the file
names start with a number, retain the original order of the
attachments.
If no MIME parts look like a patch, use the message itself if it
looks like a patch."
(when (derived-mode-p 'notmuch-show-mode)
(let* ((handle (piem-notmuch--with-current-message
(mm-dissect-buffer)))
(n-attachments (notmuch-count-attachments handle))
patches)
(if (= n-attachments 0)
(when (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))))
(notmuch-foreach-mime-part
(lambda (p)
(when-let ((patch (piem-am-extract-attached-patch p)))
(push patch patches)))
handle)
(when patches
(setq patches (sort (nreverse patches)
(lambda (x y) (< (car x) (car y)))))
(cons (lambda ()
(dolist (patch patches)
(insert (cdr patch))))
"mbox"))))))
(defun piem-notmuch-extract-patch-am-ready-mbox ()
"Return a function that inserts an am-ready mbox.
Use the message itself if it looks like a patch using
notmuch-extract-patch to get the latest patch series from the
notmuch thread."
(when (and (derived-mode-p 'notmuch-show-mode)
(string-match-p piem-patch-subject-re
(notmuch-show-get-subject))
(= (notmuch-count-attachments
(piem-notmuch--with-current-message
(mm-dissect-buffer)))
0))
(let* ((thread-id
(or notmuch-show-thread-id
(error "bug: notmuch-show-thread-id unexpectedly nil")))
(tid
;; Copied from mailscripts.el
;;
;; If `notmuch-show' was called with a notmuch query rather
;; than a thread ID, as `org-notmuch-follow-link' in
;; org-notmuch.el does, then `notmuch-show-thread-id' might
;; be an arbitrary notmuch query instead of a thread ID. We
;; need to wrap such a query in thread:{} before passing it
;; to notmuch-extract-patch(1), or we might not get a whole
;; thread extracted (e.g. if the query is just id:foo)
(if (string= (substring thread-id 0 7) "thread:")
thread-id
(concat "thread:{" thread-id "}"))))
(lambda ()
(call-process piem-notmuch-extract-patch-executable nil t nil
tid)))))
(defun piem-notmuch-show-get-public-inbox-link (mid)
"Given the message-id MID, return the public-inbox url.
This will lookup the url in the inboxes returned by
`piem-merged-inboxes'."
(piem-mid-url mid
(or (piem-notmuch-get-inbox)
(user-error "No inbox associated with current buffer"))))
;;;###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.
This will add a new entry to
`notmuch-show-stash-mlarchive-link-alist' which will determine
the archive url by searching the inboxes returned by
`piem-merged-inboxes'. You can also set
`notmuch-show-stash-mlarchive-link-default' to \"piem\" to make
this the default behavior when calling
`notmuch-show-stash-mlarchive-link'."
: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)
(add-to-list 'notmuch-show-stash-mlarchive-link-alist
'("piem" . piem-notmuch-show-get-public-inbox-link)))
(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)
(setq notmuch-show-stash-mlarchive-link-alist
(delete '("piem" . piem-notmuch-show-get-public-inbox-link)
notmuch-show-stash-mlarchive-link-alist))))
;;; piem-notmuch.el ends here
(provide 'piem-notmuch)
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