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;;; nnnotmuch.el --- Gnus backend for notmuch -*- lexical-binding: t; -*-
;; Copyright (C) 2021 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:
;; A Gnus mail backend using notmuch.
;;; Code:
(require 'gnus)
(require 'nnheader)
(require 'nnmail)
(require 'nnoo)
(require 'notmuch)
(nnoo-declare nnnotmuch)
(defvoo nnnotmuch-directory message-directory
"Spool directory for the nnnotmuch mail backend.")
(defvoo nnnotmuch-inhibit-expiry nil
"If non-nil, inhibit expiry.")
(defvoo nnnotmuch-saved-searches nil)
;;; Interface functions.
(nnoo-define-basics nnnotmuch)
(deffoo nnnotmuch-open-server (server &optional defs)
(nnoo-change-server 'nnnotmuch server defs)
(setq nnnotmuch-article-files nil)
(cond
((not (file-exists-p nnnotmuch-directory))
(nnnotmuch-close-server)
(nnheader-report 'nnnotmuch "Directory doesn't exist: %s" nnnotmuch-directory))
((not (file-directory-p (file-truename nnnotmuch-directory)))
(nnnotmuch-close-server)
(nnheader-report 'nnnotmuch "Not a directory: %s" nnnotmuch-directory))
(t
(nnheader-report 'nnnotmuch "Opened server %s using directory %s"
server nnnotmuch-directory)
t)))
(deffoo nnnotmuch-close-server (server)
(setq nnnotmuch-article-files nil))
(deffoo nnnotmuch-request-regenerate (server)
(setq nnnotmuch-article-files nil)
(nnnotmuch--tag "*" "-nnnotmuch")
t)
(deffoo nnnotmuch-request-list (&optional _server)
(with-current-buffer nntp-server-buffer
(erase-buffer)
(dolist (s nnnotmuch-saved-searches)
(when-let (q (plist-get s :query))
(let ((name (plist-get s :name))
(total (nnnotmuch--count q)))
(insert (format "%s %d 1 y\n" name total))))))
t)
(deffoo nnnotmuch-retrieve-headers (sequence &optional group server _fetch-old)
(message "retrieving headers for sequence %s" sequence)
(when (nnnotmuch-set-group-context group server)
(with-current-buffer nntp-server-buffer
(erase-buffer)
(let* ((file nil)
(number (length sequence))
(count 0)
(file-name-coding-system nnmail-pathname-coding-system)
beg article)
(if (stringp (car sequence))
'headers
(while sequence
(setq article (car sequence))
(setq file (nnnotmuch-article-to-file article group))
(when (and file
(file-exists-p file)
(not (file-directory-p file)))
(insert (format "221 %d Article retrieved.\n" article))
(setq beg (point))
(nnheader-insert-head file)
(goto-char beg)
(if (re-search-forward "\n\r?\n" nil t)
(forward-char -1)
(goto-char (point-max))
(insert "\n\n"))
(insert ".\n")
(delete-region (point) (point-max)))
(setq sequence (cdr sequence))
(setq count (1+ count))
(and (numberp nnmail-large-newsgroup)
(> number nnmail-large-newsgroup)
(zerop (% count 20))
(nnheader-message 6 "nnnotmuch: Receiving headers... %d%%"
(floor (* count 100.0) number))))
(and (numberp nnmail-large-newsgroup)
(> number nnmail-large-newsgroup)
(nnheader-message 6 "nnml: Receiving headers...done"))
(nnheader-fold-continuation-lines)
'headers)))))
(deffoo nnnotmuch-request-article (id &optional group _server buffer)
;; (nnnotmuch-set-group-context group server)
(let* ((nntp-server-buffer (or buffer nntp-server-buffer))
(file-name-coding-system nnmail-pathname-coding-system)
(d (nnnotmuch--article-data id group))
(id (car d))
(file (or (cadr d) (nnnotmuch--find-message-file id))))
(cond
((not file)
(nnheader-report 'nnnotmuch "No such article: %s" id))
((not (file-exists-p file))
(nnheader-report 'nnnotmuch "No such file: %s" file))
((file-directory-p file)
(nnheader-report 'nnnotmuch "File is a directory: %s" file))
((not (save-excursion (nnmail-find-file file)))
(nnheader-report 'nnnotmuch "Couldn't read file: %s" file))
(t
(nnnotmuch--tag id "+nnnotmuch")
(nnheader-report 'nnnotmuch "Article %s retrieved" id)
(cons group id)))))
(deffoo nnnotmuch-request-expire-articles (articles group &optional _server _force)
(let ((excluded) (ids))
(dolist (a articles)
(if-let (id (car (nnnotmuch--article-data a group)))
(push id ids)
(push a excluded)))
(when ids
(nnnotmuch--tag (mapconcat #'identity ids " OR ") "+deleted +nnnotmuch"))
excluded))
;; (deffoo nnnotmuch-request-move-article
;; (article group server accept-form &optional last _move-is-internal)
;; (error "Not implemented yet"))
(deffoo nnnotmuch-request-group (group &optional server _dont-check _info)
(message "opening %s" group)
(if (nnnotmuch-set-group-context group server)
(let ((n (length (cdr (assoc group nnnotmuch-article-files)))))
(message "we found here %s articles" n)
(with-current-buffer nntp-server-buffer
(erase-buffer)
(nnheader-insert "211 %d %d %d %s\n" n 1 n group)
n))
(message "we didn't find anything!!")
(nnheader-report 'nnnotmuch "Invalid group")))
(deffoo nnnotmuch-request-group-scan (group &optional server _info)
(nnnotmuch-set-group-context group server))
(deffoo nnnotmuch-request-scan (&optional group server)
(nnnotmuch-set-group-context group server))
(deffoo nnnotmuch-close-group (_group &optional _server)
t)
(deffoo nnnotmuch-request-create-group (group &optional _server _args)
(let ((query (read-string "Query: ")))
(add-to-list 'nnnotmuch-saved-searches `(:name ,group :query ,query))))
(deffoo nnnotmuch-request-newgroups (_date &optional server)
(nnnotmuch-request-list server))
;; (deffoo nnnotmuch-request-rename-group (group new-name &optional _server)
;; (error "Not implemented yet"))
(defvar nnnotmuch-article-files nil)
(defun nnnotmuch--find-query (name)
(when-let (s (seq-find (lambda (s) (string= (plist-get s :name) name))
nnnotmuch-saved-searches))
(plist-get s :query)))
(defun nnnotmuch--find-message-file (id)
(car (split-string
(shell-command-to-string
(format "notmuch search --output=files %s"
(if (string-prefix-p "id:" id) id (concat "id:" id)))))))
(defun nnnotmuch--article-data (article group)
(cond ((stringp article) (list article))
((numberp article)
(when-let (data (cdr (assoc group nnnotmuch-article-files)))
(elt data (1- article))))))
(defun nnnotmuch-article-to-file (article group)
(when-let (d (nnnotmuch--article-data article group))
(or (cadr d) (nnnotmuch--find-message-file (car d)))))
(defun nnnotmuch--count (query &optional context)
(let ((cmd (format "notmuch count -- '(%s)%s'"
query
(if context (concat " AND " context) ""))))
(string-to-number (shell-command-to-string cmd))))
(defun nnnotmuch--search (query &optional context)
(let ((cmd (format "notmuch search --sort=oldest-first --output=messages -- %s%s"
(shell-quote-argument (format "(%s)" query))
(if context (concat " AND " context) ""))))
(split-string (shell-command-to-string cmd))))
(defun nnnotmuch--tag (query tags)
(let ((cmd (format "notmuch tag %s -- '(%s)'" tags query)))
(shell-command-to-string cmd)))
(defun nnnotmuch--ids-query (ids) (mapconcat #'identity ids " OR "))
(defun nnnotmuch--init-data (full-group query)
(nnnotmuch--tag (concat query " AND NOT tag:new AND not tag:nnnotmuch")
"+nnnotmuch")
(let* ((ids (nnnotmuch--search query "tag:nnnotmuch"))
(info (gnus-get-info full-group))
(read (when (> (length ids) 0) (list (cons 1 (length ids)))))
(marks (list (cons 'seen read))))
(gnus-info-set-marks info marks)
(setf (gnus-info-read info) read)
(gnus-set-info full-group info)
(message "group %s - %s" full-group (gnus-get-info full-group))
(mapcar #'list ids)))
(defun nnnotmuch--set-group-data (group data)
(setf (alist-get group nnnotmuch-article-files nil t #'string=) data))
(defun nnnotmuch-set-group-context (group &optional server)
(when (and server (not (nnnotmuch-server-opened server)))
(nnnotmuch-open-server server))
(when-let (query (nnnotmuch--find-query group))
(setq nnnotmuch-current-group group)
(let* ((full-group (gnus-group-prefixed-name group `(nnnotmuch ,server)))
(data (or (cdr (assoc group nnnotmuch-article-files))
(nnnotmuch--init-data full-group query)))
(ids (nnnotmuch--search query "tag:new AND NOT tag:nnnotmuch"))
(new-data (mapcar (lambda (id)
(list id (nnnotmuch--find-message-file id)))
ids)))
(when (> (length ids) 0)
(nnnotmuch--tag (nnnotmuch--ids-query ids) "-new"))
(nnnotmuch--set-group-data group (append data new-data))
(gnus-set-active (gnus-group-prefixed-name group `(nnnotmuch ,server))
(cons 1 (+ (length new-data) (length data)))))))
(provide 'nnnotmuch)
;;; nnnotmuch.el ends here
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