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 (defvar gnus-demon-handlers nil
38 "Alist of daemonic handlers to be run at intervals.
39 Each handler is a list on the form
43 FUNCTION is the function to be called.
44 TIME is the number of `gnus-demon-timestep's between each call.
45 If nil, never call. If t, call each `gnus-demon-timestep'.
46 If IDLE is t, only call if Emacs has been idle for a while. If IDLE
47 is a number, only call when Emacs has been idle more than this number
48 of `gnus-demon-timestep's. If IDLE is nil, don't care about
49 idleness. If IDLE is a number and TIME is nil, then call once each
50 time Emacs has been idle for IDLE `gnus-demon-timestep's.")
52 (defvar gnus-demon-timestep 60
53 "*Number of seconds in each demon timestep.")
55 ;;; Internal variables.
57 (defvar gnus-demon-timer nil)
58 (defvar gnus-demon-idle-has-been-called nil)
59 (defvar gnus-demon-idle-time 0)
60 (defvar gnus-demon-handler-state nil)
61 (defvar gnus-demon-is-idle nil)
62 (defvar gnus-demon-last-keys nil)
65 (autoload 'timezone-parse-date "timezone")
66 (autoload 'timezone-make-arpa-date "timezone"))
70 (defun gnus-demon-add-handler (function time idle)
71 "Add the handler FUNCTION to be run at TIME and IDLE."
72 ;; First remove any old handlers that use this function.
73 (gnus-demon-remove-handler function)
74 ;; Then add the new one.
75 (push (list function time idle) gnus-demon-handlers)
78 (defun gnus-demon-remove-handler (function &optional no-init)
79 "Remove the handler FUNCTION from the list of handlers."
80 (setq gnus-demon-handlers
81 (delq (assq function gnus-demon-handlers)
83 (or no-init (gnus-demon-init)))
85 (defun gnus-demon-init ()
86 "Initialize the Gnus daemon."
89 (if (null gnus-demon-handlers)
92 (setq gnus-demon-timer
94 gnus-demon-timestep gnus-demon-timestep 'gnus-demon))
95 ;; Reset control variables.
96 (setq gnus-demon-handler-state
99 (list (car handler) (gnus-demon-time-to-step (nth 1 handler))
101 gnus-demon-handlers))
102 (setq gnus-demon-idle-time 0)
103 (setq gnus-demon-idle-has-been-called nil)
104 (setq gnus-use-demon t)))
106 (gnus-add-shutdown 'gnus-demon-cancel 'gnus)
108 (defun gnus-demon-cancel ()
109 "Cancel any Gnus daemons."
111 (and gnus-demon-timer
112 (nnheader-cancel-timer gnus-demon-timer))
113 (setq gnus-demon-timer nil
116 (nnheader-cancel-function-timers 'gnus-demon)
119 (defun gnus-demon-is-idle-p ()
120 "Whether Emacs is idle or not."
121 ;; We do this simply by comparing the 100 most recent keystrokes
122 ;; with the ones we had last time. If they are the same, one might
123 ;; guess that Emacs is indeed idle. This only makes sense if one
124 ;; calls this function seldom -- like once a minute, which is what
126 (let ((keys (recent-keys)))
127 (or (equal keys gnus-demon-last-keys)
129 (setq gnus-demon-last-keys keys)
132 (defun gnus-demon-time-to-step (time)
133 "Find out how many seconds to TIME, which is on the form \"17:43\"."
134 (if (not (stringp time))
136 (let* ((date (current-time-string))
137 (dv (timezone-parse-date date))
138 (tdate (timezone-make-arpa-date
139 (string-to-number (aref dv 0))
140 (string-to-number (aref dv 1))
141 (string-to-number (aref dv 2)) time
142 (or (aref dv 4) "UT")))
143 (nseconds (gnus-time-minus
144 (gnus-encode-date tdate) (gnus-encode-date date))))
146 (/ (if (< nseconds 0)
147 (+ nseconds (* 60 60 24))
148 nseconds) gnus-demon-timestep)))))
151 "The Gnus daemon that takes care of running all Gnus handlers."
152 ;; Increase or reset the time Emacs has been idle.
153 (if (gnus-demon-is-idle-p)
154 (incf gnus-demon-idle-time)
155 (setq gnus-demon-idle-time 0)
156 (setq gnus-demon-idle-has-been-called nil))
157 ;; Then we go through all the handler and call those that are
158 ;; sufficiently ripe.
159 (let ((handlers gnus-demon-handler-state)
162 (setq handler (pop handlers))
164 ((numberp (setq time (nth 1 handler)))
165 ;; These handlers use a regular timeout mechanism. We decrease
166 ;; the timer if it hasn't reached zero yet.
168 (setcar (nthcdr 1 handler) (decf time)))
169 (and (zerop time) ; If the timer now is zero...
170 (or (not (setq idle (nth 2 handler))) ; Don't care about idle.
171 (and (numberp idle) ; Numerical idle...
172 (< idle gnus-demon-idle-time)) ; Idle timed out.
173 gnus-demon-is-idle) ; Or just need to be idle.
174 ;; So we call the handler.
176 (funcall (car handler))
177 ;; And reset the timer.
178 (setcar (nthcdr 1 handler)
179 (gnus-demon-time-to-step
180 (nth 1 (assq (car handler) gnus-demon-handlers)))))))
181 ;; These are only supposed to be called when Emacs is idle.
182 ((null (setq idle (nth 2 handler)))
185 ((not (numberp idle))
186 ;; We want to call this handler each and every time that
188 (funcall (car handler)))
190 ;; We want to call this handler only if Emacs has been idle
191 ;; for a specified number of timesteps.
192 (and (not (memq (car handler) gnus-demon-idle-has-been-called))
193 (< idle gnus-demon-idle-time)
195 (funcall (car handler))
196 ;; Make sure the handler won't be called once more in
198 (push (car handler) gnus-demon-idle-has-been-called))))))))
200 (defun gnus-demon-add-nocem ()
201 "Add daemonic NoCeM handling to Gnus."
202 (gnus-demon-add-handler 'gnus-demon-scan-nocem 60 t))
204 (defun gnus-demon-scan-nocem ()
205 "Scan NoCeM groups for NoCeM messages."
206 (gnus-nocem-scan-groups))
208 (defun gnus-demon-add-disconnection ()
209 "Add daemonic server disconnection to Gnus."
210 (gnus-demon-add-handler 'gnus-demon-close-connections nil 30))
212 (defun gnus-demon-close-connections ()
213 (gnus-close-backends))
215 (defun gnus-demon-add-scanmail ()
216 "Add daemonic scanning of mail from the mail backends."
217 (gnus-demon-add-handler 'gnus-demon-scan-mail 120 60))
219 (defun gnus-demon-scan-mail ()
220 (let ((servers gnus-opened-servers)
222 (while (setq server (car (pop servers)))
223 (and (gnus-check-backend-function 'request-scan (car server))
224 (or (gnus-server-opened server)
225 (gnus-open-server server))
226 (gnus-request-scan nil server)))))
228 (defun gnus-demon-add-rescan ()
229 "Add daemonic scanning of new articles from all backends."
230 (gnus-demon-add-handler 'gnus-demon-scan-news 120 60))
232 (defun gnus-demon-scan-news ()
235 (set-buffer gnus-group-buffer)
236 (gnus-group-get-new-news))))
238 (provide 'gnus-demon)
240 ;;; gnus-demon.el ends here