lisp/gnus/gnus-delay.el

   1 ;;; gnus-delay.el --- Delayed posting of articles
   2
   3 ;; Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010
   4 ;;   Free Software Foundation, Inc.
   5
   6 ;; Author: Kai Großjohann <Kai.Grossjohann@CS.Uni-Dortmund.DE>
   7 ;; Keywords: mail, news, extensions
   8
   9 ;; This file is part of GNU Emacs.
  10
  11 ;; GNU Emacs is free software: you can redistribute it and/or modify
  12 ;; it under the terms of the GNU General Public License as published by
  13 ;; the Free Software Foundation, either version 3 of the License, or
  14 ;; (at your option) any later version.
  15
  16 ;; GNU Emacs is distributed in the hope that it will be useful,
  17 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  18 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19 ;; GNU General Public License for more details.
  20
  21 ;; You should have received a copy of the GNU General Public License
  22 ;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
  23
  24 ;;; Commentary:
  25
  26 ;; Provide delayed posting of articles.
  27
  28 ;;; Todo:
  29
  30 ;; * `gnus-delay-send-queue' barfs when group does not exist.
  31 ;; * Integrate gnus-delay.el into the rest of Gnus automatically.  How
  32 ;;   should this be done?  Basically, we need to do what
  33 ;;   `gnus-delay-initialize' does.  But in which files?
  34
  35 ;;; Code:
  36
  37 (require 'nndraft)
  38 (require 'gnus-draft)
  39 (autoload 'parse-time-string "parse-time" nil nil)
  40
  41 (defgroup gnus-delay nil
  42   "Arrange for sending postings later."
  43   :version "22.1"
  44   :group 'gnus)
  45
  46 (defcustom gnus-delay-group "delayed"
  47   "Group name for storing delayed articles."
  48   :type 'string
  49   :group 'gnus-delay)
  50
  51 (defcustom gnus-delay-header "X-Gnus-Delayed"
  52   "Header name for storing info about delayed articles."
  53   :type 'string
  54   :group 'gnus-delay)
  55
  56 (defcustom gnus-delay-default-delay "3d"
  57   "*Default length of delay."
  58   :type 'string
  59   :group 'gnus-delay)
  60
  61 (defcustom gnus-delay-default-hour 8
  62   "*If deadline is given as date, then assume this time of day."
  63   :version "22.1"
  64   :type 'integer
  65   :group 'gnus-delay)
  66
  67 ;;;###autoload
  68 (defun gnus-delay-article (delay)
  69   "Delay this article by some time.
  70 DELAY is a string, giving the length of the time.  Possible values are:
  71
  72 * <digits><units> for <units> in minutes (`m'), hours (`h'), days (`d'),
  73   weeks (`w'), months (`M'), or years (`Y');
  74
  75 * YYYY-MM-DD for a specific date.  The time of day is given by the
  76   variable `gnus-delay-default-hour', minute and second are zero.
  77
  78 * hh:mm for a specific time.  Use 24h format.  If it is later than this
  79   time, then the deadline is tomorrow, else today."
  80   (interactive
  81    (list (read-string
  82           "Target date (YYYY-MM-DD) or length of delay (units in [mhdwMY]): "
  83           gnus-delay-default-delay)))
  84   (let (num unit days year month day hour minute deadline)
  85     (cond ((string-match
  86             "\\([0-9][0-9][0-9]?[0-9]?\\)-\\([0-9]+\\)-\\([0-9]+\\)"
  87             delay)
  88            (setq year  (string-to-number (match-string 1 delay))
  89                  month (string-to-number (match-string 2 delay))
  90                  day   (string-to-number (match-string 3 delay)))
  91            (setq deadline
  92                  (message-make-date
  93                   (encode-time 0 0      ; second and minute
  94                                gnus-delay-default-hour
  95                                day month year))))
  96           ((string-match "\\([0-9]+\\):\\([0-9]+\\)" delay)
  97            (setq hour   (string-to-number (match-string 1 delay))
  98                  minute (string-to-number (match-string 2 delay)))
  99            ;; Use current time, except...
 100            (setq deadline (apply 'vector (decode-time (current-time))))
 101            ;; ... for minute and hour.
 102            (aset deadline 1 minute)
 103            (aset deadline 2 hour)
 104            ;; Convert to seconds.
 105            (setq deadline (gnus-float-time (apply 'encode-time
 106                                                   (append deadline nil))))
 107            ;; If this time has passed already, add a day.
 108            (when (< deadline (gnus-float-time))
 109              (setq deadline (+ 3600 deadline))) ;3600 secs/day
 110            ;; Convert seconds to date header.
 111            (setq deadline (message-make-date
 112                            (seconds-to-time deadline))))
 113           ((string-match "\\([0-9]+\\)\\s-*\\([mhdwMY]\\)" delay)
 114            (setq num (match-string 1 delay))
 115            (setq unit (match-string 2 delay))
 116            ;; Start from seconds, then multiply into needed units.
 117            (setq num (string-to-number num))
 118            (cond ((string= unit "Y")
 119                   (setq delay (* num 60 60 24 365)))
 120                  ((string= unit "M")
 121                   (setq delay (* num 60 60 24 30)))
 122                  ((string= unit "w")
 123                   (setq delay (* num 60 60 24 7)))
 124                  ((string= unit "d")
 125                   (setq delay (* num 60 60 24)))
 126                  ((string= unit "h")
 127                   (setq delay (* num 60 60)))
 128                  (t
 129                   (setq delay (* num 60))))
 130            (setq deadline (message-make-date
 131                            (seconds-to-time (+ (gnus-float-time) delay)))))
 132           (t (error "Malformed delay `%s'" delay)))
 133     (message-add-header (format "%s: %s" gnus-delay-header deadline)))
 134   (set-buffer-modified-p t)
 135   ;; If group does not exist, create it.
 136   (let ((group (format "nndraft:%s" gnus-delay-group)))
 137     (gnus-agent-queue-setup gnus-delay-group))
 138   (message-disassociate-draft)
 139   (nndraft-request-associate-buffer gnus-delay-group)
 140   (save-buffer 0)
 141   (kill-buffer (current-buffer))
 142   (message-do-actions message-postpone-actions))
 143
 144 ;;;###autoload
 145 (defun gnus-delay-send-queue ()
 146   "Send all the delayed messages that are due now."
 147   (interactive)
 148   (save-excursion
 149     (let* ((group (format "nndraft:%s" gnus-delay-group))
 150            (message-send-hook (copy-sequence message-send-hook))
 151            articles
 152            article deadline)
 153       (when (gnus-group-entry group)
 154         (gnus-activate-group group)
 155         (add-hook 'message-send-hook
 156                   '(lambda ()
 157                      (message-remove-header gnus-delay-header)))
 158         (setq articles (nndraft-articles))
 159         (while (setq article (pop articles))
 160           (gnus-request-head article group)
 161           (set-buffer nntp-server-buffer)
 162           (goto-char (point-min))
 163           (if (re-search-forward
 164                (concat "^" (regexp-quote gnus-delay-header) ":\\s-+")
 165                nil t)
 166               (progn
 167                 (setq deadline (nnheader-header-value))
 168                 (setq deadline (apply 'encode-time
 169                                       (parse-time-string deadline)))
 170                 (setq deadline (time-since deadline))
 171                 (when (and (>= (nth 0 deadline) 0)
 172                            (>= (nth 1 deadline) 0))
 173                   (message "Sending delayed article %d" article)
 174                   (gnus-draft-send article group)
 175                   (message "Sending delayed article %d...done" article)))
 176             (message "Delay header missing for article %d" article)))))))
 177
 178 ;;;###autoload
 179 (defun gnus-delay-initialize (&optional no-keymap no-check)
 180   "Initialize the gnus-delay package.
 181 This sets up a key binding in `message-mode' to delay a message.
 182 This tells Gnus to look for delayed messages after getting new news.
 183
 184 The optional arg NO-KEYMAP is ignored.
 185 Checking delayed messages is skipped if optional arg NO-CHECK is non-nil."
 186   (unless no-check
 187     (add-hook 'gnus-get-new-news-hook 'gnus-delay-send-queue)))
 188
 189 (provide 'gnus-delay)
 190
 191 ;; Local Variables:
 192 ;; coding: iso-8859-1
 193 ;; End:
 194
 195 ;; arch-tag: fb2ad634-a897-4142-a503-f5991ec2349d
 196 ;;; gnus-delay.el ends here