gnus/notmuch interaction recovered

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diff --git a/attic/elisp/jao-notmuch-gnus.el b/attic/elisp/jao-notmuch-gnus.el
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--- a/attic/elisp/jao-notmuch-gnus.el
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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))
-
-;;; Gnus search using notmuch
-
-(add-to-list 'gnus-search-expandable-keys "list")
-
-(cl-defmethod gnus-search-transform-expression ((engine gnus-search-notmuch)
-                                                (expr (head list)))
-  (format "List:%s" (gnus-search-transform-expression engine (cdr expr))))
-
-
-;;; 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."))))
-
-(defun jao-notmuch-gnus-engine (prefix config)
-  (let ((prefix (file-name-as-directory (expand-file-name prefix "~")))
-        (config (expand-file-name config gnus-home-directory)))
-    `(gnus-search-engine gnus-search-notmuch
-                         (remove-prefix ,prefix)
-                         (config-file ,config))))
-
-;;; 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