1 ;;; gnus-demon.el --- daemonic Gnus behaviour
2 ;; Copyright (C) 1995,96 Free Software Foundation, Inc.
4 ;; Author: Lars Magne Ingebrigtsen <larsi@ifi.uio.no>
7 ;; This file is part of GNU Emacs.
9 ;; GNU Emacs is free software; you can redistribute it and/or modify
10 ;; it under the terms of the GNU General Public License as published by
11 ;; the Free Software Foundation; either version 2, or (at your option)
14 ;; GNU Emacs is distributed in the hope that it will be useful,
15 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
16 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 ;; GNU General Public License for more details.
19 ;; You should have received a copy of the GNU General Public License
20 ;; along with GNU Emacs; see the file COPYING. If not, write to the
21 ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
22 ;; Boston, MA 02111-1307, USA.
33 (if (string-match "XEmacs" (emacs-version))
37 (defgroup gnus-demon nil
41 (defcustom gnus-demon-handlers nil
42 "Alist of daemonic handlers to be run at intervals.
43 Each handler is a list on the form
47 FUNCTION is the function to be called.
48 TIME is the number of `gnus-demon-timestep's between each call.
49 If nil, never call. If t, call each `gnus-demon-timestep'.
50 If IDLE is t, only call if Emacs has been idle for a while. If IDLE
51 is a number, only call when Emacs has been idle more than this number
52 of `gnus-demon-timestep's. If IDLE is nil, don't care about
53 idleness. If IDLE is a number and TIME is nil, then call once each
54 time Emacs has been idle for IDLE `gnus-demon-timestep's."
56 :type '(repeat (list function
58 (const :tag "never" nil)
60 (integer :tag "steps" 1))
62 (const :tag "don't care" nil)
63 (const :tag "for a while" t)
64 (integer :tag "steps" 1)))))
66 (defcustom gnus-demon-timestep 60
67 "*Number of seconds in each demon timestep."
71 ;;; Internal variables.
73 (defvar gnus-demon-timer nil)
74 (defvar gnus-demon-idle-has-been-called nil)
75 (defvar gnus-demon-idle-time 0)
76 (defvar gnus-demon-handler-state nil)
77 (defvar gnus-demon-is-idle nil)
78 (defvar gnus-demon-last-keys nil)
81 (autoload 'timezone-parse-date "timezone")
82 (autoload 'timezone-make-arpa-date "timezone"))
86 (defun gnus-demon-add-handler (function time idle)
87 "Add the handler FUNCTION to be run at TIME and IDLE."
88 ;; First remove any old handlers that use this function.
89 (gnus-demon-remove-handler function)
90 ;; Then add the new one.
91 (push (list function time idle) gnus-demon-handlers)
94 (defun gnus-demon-remove-handler (function &optional no-init)
95 "Remove the handler FUNCTION from the list of handlers."
96 (setq gnus-demon-handlers
97 (delq (assq function gnus-demon-handlers)
102 (defun gnus-demon-init ()
103 "Initialize the Gnus daemon."
106 (if (null gnus-demon-handlers)
109 (setq gnus-demon-timer
110 (nnheader-run-at-time
111 gnus-demon-timestep gnus-demon-timestep 'gnus-demon))
112 ;; Reset control variables.
113 (setq gnus-demon-handler-state
116 (list (car handler) (gnus-demon-time-to-step (nth 1 handler))
118 gnus-demon-handlers))
119 (setq gnus-demon-idle-time 0)
120 (setq gnus-demon-idle-has-been-called nil)
121 (setq gnus-use-demon t)))
123 (gnus-add-shutdown 'gnus-demon-cancel 'gnus)
125 (defun gnus-demon-cancel ()
126 "Cancel any Gnus daemons."
128 (when gnus-demon-timer
129 (nnheader-cancel-timer gnus-demon-timer))
130 (setq gnus-demon-timer nil
133 (nnheader-cancel-function-timers 'gnus-demon)
136 (defun gnus-demon-is-idle-p ()
137 "Whether Emacs is idle or not."
138 ;; We do this simply by comparing the 100 most recent keystrokes
139 ;; with the ones we had last time. If they are the same, one might
140 ;; guess that Emacs is indeed idle. This only makes sense if one
141 ;; calls this function seldom -- like once a minute, which is what
143 (let ((keys (recent-keys)))
144 (or (equal keys gnus-demon-last-keys)
146 (setq gnus-demon-last-keys keys)
149 (defun gnus-demon-time-to-step (time)
150 "Find out how many seconds to TIME, which is on the form \"17:43\"."
151 (if (not (stringp time))
153 (let* ((date (current-time-string))
154 (dv (timezone-parse-date date))
155 (tdate (timezone-make-arpa-date
156 (string-to-number (aref dv 0))
157 (string-to-number (aref dv 1))
158 (string-to-number (aref dv 2)) time
159 (or (aref dv 4) "UT")))
160 (nseconds (gnus-time-minus
161 (gnus-encode-date tdate) (gnus-encode-date date))))
163 (/ (if (< nseconds 0)
164 (+ nseconds (* 60 60 24))
166 gnus-demon-timestep)))))
169 "The Gnus daemon that takes care of running all Gnus handlers."
170 ;; Increase or reset the time Emacs has been idle.
171 (if (gnus-demon-is-idle-p)
172 (incf gnus-demon-idle-time)
173 (setq gnus-demon-idle-time 0)
174 (setq gnus-demon-idle-has-been-called nil))
175 ;; Then we go through all the handler and call those that are
176 ;; sufficiently ripe.
177 (let ((handlers gnus-demon-handler-state)
180 (setq handler (pop handlers))
182 ((numberp (setq time (nth 1 handler)))
183 ;; These handlers use a regular timeout mechanism. We decrease
184 ;; the timer if it hasn't reached zero yet.
186 (setcar (nthcdr 1 handler) (decf time)))
187 (and (zerop time) ; If the timer now is zero...
188 (or (not (setq idle (nth 2 handler))) ; Don't care about idle.
189 (and (numberp idle) ; Numerical idle...
190 (< idle gnus-demon-idle-time)) ; Idle timed out.
191 gnus-demon-is-idle) ; Or just need to be idle.
192 ;; So we call the handler.
194 (funcall (car handler))
195 ;; And reset the timer.
196 (setcar (nthcdr 1 handler)
197 (gnus-demon-time-to-step
198 (nth 1 (assq (car handler) gnus-demon-handlers)))))))
199 ;; These are only supposed to be called when Emacs is idle.
200 ((null (setq idle (nth 2 handler)))
203 ((not (numberp idle))
204 ;; We want to call this handler each and every time that
206 (funcall (car handler)))
208 ;; We want to call this handler only if Emacs has been idle
209 ;; for a specified number of timesteps.
210 (and (not (memq (car handler) gnus-demon-idle-has-been-called))
211 (< idle gnus-demon-idle-time)
213 (funcall (car handler))
214 ;; Make sure the handler won't be called once more in
216 (push (car handler) gnus-demon-idle-has-been-called))))))))
218 (defun gnus-demon-add-nocem ()
219 "Add daemonic NoCeM handling to Gnus."
220 (gnus-demon-add-handler 'gnus-demon-scan-nocem 60 t))
222 (defun gnus-demon-scan-nocem ()
223 "Scan NoCeM groups for NoCeM messages."
224 (gnus-nocem-scan-groups))
226 (defun gnus-demon-add-disconnection ()
227 "Add daemonic server disconnection to Gnus."
228 (gnus-demon-add-handler 'gnus-demon-close-connections nil 30))
230 (defun gnus-demon-close-connections ()
231 (gnus-close-backends))
233 (defun gnus-demon-add-scanmail ()
234 "Add daemonic scanning of mail from the mail backends."
235 (gnus-demon-add-handler 'gnus-demon-scan-mail 120 60))
237 (defun gnus-demon-scan-mail ()
238 (let ((servers gnus-opened-servers)
240 (while (setq server (car (pop servers)))
241 (and (gnus-check-backend-function 'request-scan (car server))
242 (or (gnus-server-opened server)
243 (gnus-open-server server))
244 (gnus-request-scan nil server)))))
246 (defun gnus-demon-add-rescan ()
247 "Add daemonic scanning of new articles from all backends."
248 (gnus-demon-add-handler 'gnus-demon-scan-news 120 60))
250 (defun gnus-demon-scan-news ()
253 (set-buffer gnus-group-buffer)
254 (gnus-group-get-new-news))))
256 (provide 'gnus-demon)
258 ;;; gnus-demon.el ends here