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;;; gnus-delay.el --- Delayed posting of articles -*- lexical-binding: t; -*-
;; Copyright (C) 2001-2021 Free Software Foundation, Inc.
;; Author: Kai Großjohann <Kai.Grossjohann@CS.Uni-Dortmund.DE>
;; Keywords: mail, news, extensions
;; This file is part of GNU Emacs.
;; GNU Emacs 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.
;; GNU Emacs 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 GNU Emacs. If not, see <https://www.gnu.org/licenses/>.
;;; Commentary:
;; Provide delayed posting of articles.
;;; Todo:
;; * `gnus-delay-send-queue' barfs when group does not exist.
;; * Integrate gnus-delay.el into the rest of Gnus automatically. How
;; should this be done? Basically, we need to do what
;; `gnus-delay-initialize' does. But in which files?
;;; Code:
(require 'nndraft)
(require 'gnus-draft)
(autoload 'parse-time-string "parse-time" nil nil)
(defgroup gnus-delay nil
"Arrange for sending postings later."
:version "22.1"
:group 'gnus)
(defcustom gnus-delay-group "delayed"
"Group name for storing delayed articles."
:type 'string)
(defcustom gnus-delay-header "X-Gnus-Delayed"
"Header name for storing info about delayed articles."
:type 'string)
(defcustom gnus-delay-default-delay "3d"
"Default length of delay."
:type 'string)
(defcustom gnus-delay-default-hour 8
"If deadline is given as date, then assume this time of day."
:version "22.1"
:type 'integer)
;;;###autoload
(defun gnus-delay-article (delay)
"Delay this article by some time.
DELAY is a string, giving the length of the time. Possible values are:
* <digits><units> for <units> in minutes (`m'), hours (`h'), days (`d'),
weeks (`w'), months (`M'), or years (`Y');
* YYYY-MM-DD for a specific date. The time of day is given by the
variable `gnus-delay-default-hour', minute and second are zero.
* hh:mm for a specific time. Use 24h format. If it is later than this
time, then the deadline is tomorrow, else today.
The value of `message-draft-headers' determines which headers are
generated when the article is delayed. Remaining headers are
generated when the article is sent."
(interactive
(list (read-string
"Target date (YYYY-MM-DD), time (hh:mm), or length of delay (units in [mhdwMY]): "
gnus-delay-default-delay)))
;; Allow spell checking etc.
(run-hooks 'message-send-hook)
(let (num unit year month day hour minute deadline) ;; days
(cond ((string-match
"\\([0-9][0-9][0-9]?[0-9]?\\)-\\([0-9]+\\)-\\([0-9]+\\)"
delay)
(setq year (string-to-number (match-string 1 delay))
month (string-to-number (match-string 2 delay))
day (string-to-number (match-string 3 delay)))
(setq deadline
(message-make-date
(encode-time 0 0 ; second and minute
gnus-delay-default-hour
day month year))))
((string-match "\\([0-9]+\\):\\([0-9]+\\)" delay)
(setq hour (string-to-number (match-string 1 delay))
minute (string-to-number (match-string 2 delay)))
;; Use current time, except...
(setq deadline (decode-time nil nil t))
;; ... for minute and hour.
(setq deadline (apply #'encode-time (car deadline) minute hour
(nthcdr 3 deadline)))
;; If this time has passed already, add a day.
(when (time-less-p deadline nil)
(setq deadline (time-add 86400 deadline))) ; 86400 secs/day
;; Convert seconds to date header.
(setq deadline (message-make-date deadline)))
((string-match "\\([0-9]+\\)\\s-*\\([mhdwMY]\\)" delay)
(setq num (match-string 1 delay))
(setq unit (match-string 2 delay))
;; Start from seconds, then multiply into needed units.
(setq num (string-to-number num))
(cond ((string= unit "Y")
(setq delay (* num 60 60 24 365)))
((string= unit "M")
(setq delay (* num 60 60 24 30)))
((string= unit "w")
(setq delay (* num 60 60 24 7)))
((string= unit "d")
(setq delay (* num 60 60 24)))
((string= unit "h")
(setq delay (* num 60 60)))
(t
(setq delay (* num 60))))
(setq deadline (message-make-date (time-add nil delay))))
(t (error "Malformed delay `%s'" delay)))
(message-add-header (format "%s: %s" gnus-delay-header deadline)))
(set-buffer-modified-p t)
;; If group does not exist, create it.
(gnus-agent-queue-setup gnus-delay-group)
(message-disassociate-draft)
(nndraft-request-associate-buffer gnus-delay-group)
(save-buffer 0)
(kill-buffer (current-buffer))
(message-do-actions message-postpone-actions))
;;;###autoload
(defun gnus-delay-send-queue ()
"Send all the delayed messages that are due now."
(interactive)
(save-excursion
(let* ((group (format "nndraft:%s" gnus-delay-group))
(message-send-hook (copy-sequence message-send-hook))
articles
article deadline)
(when (gnus-group-entry group)
(gnus-activate-group group)
(add-hook 'message-send-hook
(lambda () (message-remove-header gnus-delay-header)) t)
(setq articles (nndraft-articles))
(while (setq article (pop articles))
(gnus-request-head article group)
(set-buffer nntp-server-buffer)
(goto-char (point-min))
(if (re-search-forward
(concat "^" (regexp-quote gnus-delay-header) ":\\s-+")
nil t)
(progn
(setq deadline (nnheader-header-value))
(setq deadline (encode-time (parse-time-string deadline)))
(unless (time-less-p nil deadline)
(message "Sending delayed article %d" article)
(gnus-draft-send article group)
(message "Sending delayed article %d...done" article)))
(message "Delay header missing for article %d" article)))))))
;;;###autoload
(defun gnus-delay-initialize (&optional _no-keymap no-check)
"Initialize the gnus-delay package.
This sets up a key binding in `message-mode' to delay a message.
This tells Gnus to look for delayed messages after getting new news.
The optional arg NO-KEYMAP is ignored.
Checking delayed messages is skipped if optional arg NO-CHECK is non-nil."
(unless no-check
(add-hook 'gnus-get-new-news-hook #'gnus-delay-send-queue)))
(provide 'gnus-delay)
;; Local Variables:
;; coding: utf-8
;; End:
;;; gnus-delay.el ends here
|
