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;;; jao-notmuch-gnus.el --- notmuch-gnus interoperability -*- lexical-binding: t; -*-
;; Copyright (C) 2022 jao
;; Author: jao <mail@jao.io>
;; Keywords: mail
;; 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:
;; Helper functions to work in Gnus with mail indexed by notmuch.
;;; Code:
(require 'gnus)
(require 'ol-gnus)
(require 'notmuch-show)
;;; Tagging in notmuch from Gnus buffers
(defun jao-notmuch-gnus--notmuch-id (id)
(when id (if (string-match "<\\(.+\\)>" id) (match-string 1 id) id)))
(defun jao-notmuch-gnus-message-id (&optional no-show)
"Find the id of currently selected message in Gnus or notmuch."
(when (and (not no-show) (derived-mode-p 'gnus-summary-mode))
(save-window-excursion (gnus-summary-show-article)))
(cond (gnus-original-article-buffer
(with-current-buffer gnus-original-article-buffer
(jao-notmuch-gnus--notmuch-id (message-field-value "message-id"))))
((derived-mode-p 'notmuch-show-mode 'notmuch-tree-mode)
(notmuch-show-get-message-id))))
(defun jao-notmuch-gnus-message-tags (id)
"Ask notmuch for the tags of a message with the given ID."
(let ((cmd (format "notmuch search --output=tags 'id:%s'" id)))
(split-string (shell-command-to-string cmd))))
(defun jao-notmuch-gnus-tag-message (&optional id tags no-log)
"Interactively add or remove tags to the current message."
(interactive)
(let* ((id (or id (jao-notmuch-gnus-message-id)))
(current (unless tags (jao-notmuch-gnus-message-tags id)))
(prompt (format "Change tags %s" (string-join current "/")))
(tags (or tags (notmuch-read-tag-changes current prompt))))
(notmuch-tag (concat "id:" id) tags)
(unless no-log
(message "%s -> %s" current (jao-notmuch-gnus-message-tags id)))))
(defun jao-notmuch-gnus-show-tags ()
"Display in the echo area the tags of the current message."
(interactive)
(when-let (id (jao-notmuch-gnus-message-id))
(message "%s" (string-join (jao-notmuch-gnus-message-tags id) " "))))
(defun jao-notmuch-gnus-toggle-tags (tags &optional id current)
"Toggle the given TAGS list for the current Gnus message."
(let* ((id (or id (jao-notmuch-gnus-message-id)))
(current (or current (jao-notmuch-gnus-message-tags id)))
(tags (mapcar (lambda (x)
(concat (if (member x current) "-" "+") x))
tags)))
(notmuch-tag (concat "id:" id) tags)
(message "New tags: %s" (jao-notmuch-gnus-message-tags id))))
(defun jao-notmuch-gnus-tag-mark ()
"Remove the new tag for an article when it's marked as seen by Gnus."
(when-let (id (jao-notmuch-gnus-message-id t))
(jao-notmuch-gnus-tag-message id '("-new") t)))
(add-hook 'gnus-mark-article-hook #'jao-notmuch-gnus-tag-mark)
(defun jao-notmuch-gnus--group-tags (group)
(when (string-match ".+:\\(.+\\)" group)
(split-string (match-string 1 group) "\\.")))
(defun jao-notmuch-gnus-tag-on-move (op headers from to _d)
(when-let* ((to-tags (when to (jao-notmuch-gnus--group-tags to)))
(id (jao-notmuch-gnus--notmuch-id (mail-header-id headers))))
(if (eq op 'delete)
(let ((cur (seq-difference (jao-notmuch-gnus--group-tags from) to-tags)))
(jao-notmuch-gnus-toggle-tags (append cur to-tags) id cur))
(notmuch-tag (concat "id:" id)
(mapcar (lambda (x) (concat "+" x)) to-tags)))))
(defun jao-notmuch-gnus-auto-tag ()
(add-hook 'gnus-summary-article-move-hook #'jao-notmuch-gnus-tag-on-move)
(add-hook 'gnus-summary-article-expire-hook #'jao-notmuch-gnus-tag-on-move))
;;;; Displaying search results in Gnus
(defvar jao-notmuch-gnus-server "nnml"
"Name of the target Gnus server, e.g. nnml+mail.")
(defvar jao-notmuch-gnus-mail-directory (expand-file-name "~/.emacs.d/gnus/Mail")
"Directory where Gnus stores its mail.")
(defvar jao-notmuch-gnus-leafnode-directory (expand-file-name "~/var/news")
"Directory where leafnode stores its messages as seen by notmuch.")
(defun jao-notmuch-gnus-file-to-group (file &optional maildir newsdir)
"Compute the Gnus group name from the given file name.
Example:
IN: /home/jao/var/mail/jao/foo/cur/1259184569.M4818P3384.localhost,W=6921:2,S
OUT: nnml:jao.foo
IN: /home/jao/.emacs.d/gnus/Mail/jao.trove/32, /home/jao/.emacs.d/gnus/Mail/
OUT: nnml:jao.trove
IN: /home/jao/var/mail/gmane/foo/bar/100
OUT: nntp:gmane.foo.bar
IN: /home/jao/var/mail/bigml/cur/1259176906.M17483P24679.localhost,W=2488:2,S
OUT:nnimap:bigml/inbox"
(let* ((maildir (or maildir jao-notmuch-gnus-mail-directory))
(newsdir (or newsdir jao-notmuch-gnus-leafnode-directory))
(g (directory-file-name (file-name-directory file)))
(g (replace-regexp-in-string (file-name-as-directory maildir) "" g))
(g (replace-regexp-in-string (file-name-as-directory newsdir) "" g))
(nntp (string-match-p "^\\(gmane\\|gwene\\)/" g))
(g (cond (nntp (concat "nntp:" g))
((file-name-directory g)
(replace-regexp-in-string "^\\([^/]+\\)/"
(concat jao-notmuch-gnus-server
":\\1/")
(file-name-directory g) t))
(t (concat jao-notmuch-gnus-server ":" g))))
(g (replace-regexp-in-string "/" "." g))
(g (replace-regexp-in-string "[/.]$" "" g)))
(cond ((string-match ":$" g) (concat g "inbox"))
(nntp g)
(t (replace-regexp-in-string ":\\." ":" g)))))
(defun jao-notmuch-gnus-id-to-file (id)
(when id
(let ((cmd (format "notmuch search --output=files %s" id)))
(string-trim (shell-command-to-string cmd)))))
(defun jao-notmuch-gnus-goto-message (&optional msg-id filename)
"Open a summary buffer containing the current notmuch article."
(interactive)
(let* ((filename (or filename
(jao-notmuch-gnus-id-to-file msg-id)
(notmuch-show-get-filename)))
(group (when filename (jao-notmuch-gnus-file-to-group filename)))
(msg-id (or msg-id (notmuch-show-get-message-id)))
(msg-id (when msg-id (replace-regexp-in-string "^id:" "" msg-id))))
(if (and group msg-id)
(org-gnus-follow-link group msg-id)
(message "Couldn't get relevant infos for switching to Gnus."))))
;;;; Org links
(defun jao-notmuch-gnus--fname (id)
(let ((cmd (format "notmuch search --output=files id:%s" id)))
(car (split-string (shell-command-to-string cmd)))))
(defun jao-notmuch-gnus-org-follow (id)
(when-let* ((fname (jao-notmuch-gnus--fname id))
(group (jao-notmuch-gnus-file-to-group fname)))
(org-gnus-follow-link group id)))
(defun jao-notmuch-gnus-org-store ()
(when-let (d (or (when (derived-mode-p 'notmuch-show-mode 'notmuch-tree-mode)
(cons (notmuch-show-get-message-id)
(notmuch-show-get-subject)))
(when (derived-mode-p 'gnus-summary-mode 'gnus-article-mode)
(cons (jao-notmuch-gnus-message-id)
(gnus-summary-article-subject)))))
(org-link-store-props :type "mail"
:link (concat "mail:" (car d))
:description (concat "Mail: " (cdr d)))))
(org-link-set-parameters "mail"
:follow #'jao-notmuch-gnus-org-follow
:store #'jao-notmuch-gnus-org-store)
(org-link-set-parameters "gnus" :store #'ignore)
(org-link-set-parameters "notmuch" :store #'ignore)
;;;; consult-notmuch
(with-eval-after-load "consult-notmuch"
(defun jao-notmuch-gnus--open-candidate (candidate)
"Open a notmuch-search completion candidate email in Gnus."
(message "candidate: %S" candidate)
(jao-notmuch-gnus-goto-message (consult-notmuch--thread-id candidate)))
(defun jao-gnus-consult-notmuch ()
"Run a consult-notmuch query that opens candidates in Gnus."
(interactive)
(jao-notmuch-gnus--open-candidate (consult-notmuch--search)))
(consult-customize jao-gnus-consult-notmuch :preview-key 'any))
(provide 'jao-notmuch-gnus)
;;; jao-notmuch-gnus.el ends here
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