1 ;;; gnus-demon.el --- daemonic Gnus behaviour
3 ;; Copyright (C) 1995, 1996, 1997, 1998, 1999, 2000, 2003
4 ;; Free Software Foundation, Inc.
6 ;; Author: Lars Magne Ingebrigtsen <larsi@gnus.org>
9 ;; This file is part of GNU Emacs.
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 2, or (at your option)
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.
21 ;; You should have received a copy of the GNU General Public License
22 ;; along with GNU Emacs; see the file COPYING. If not, write to the
23 ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
24 ;; Boston, MA 02111-1307, USA.
30 (eval-when-compile (require 'cl))
39 (if (featurep 'xemacs)
43 (defgroup gnus-demon nil
47 (defcustom gnus-demon-handlers nil
48 "Alist of daemonic handlers to be run at intervals.
49 Each handler is a list on the form
53 FUNCTION is the function to be called.
54 TIME is the number of `gnus-demon-timestep's between each call.
55 If nil, never call. If t, call each `gnus-demon-timestep'.
56 If IDLE is t, only call if Emacs has been idle for a while. If IDLE
57 is a number, only call when Emacs has been idle more than this number
58 of `gnus-demon-timestep's. If IDLE is nil, don't care about
59 idleness. If IDLE is a number and TIME is nil, then call once each
60 time Emacs has been idle for IDLE `gnus-demon-timestep's."
62 :type '(repeat (list function
64 (const :tag "never" nil)
66 (integer :tag "steps" 1))
68 (const :tag "don't care" nil)
69 (const :tag "for a while" t)
70 (integer :tag "steps" 1)))))
72 (defcustom gnus-demon-timestep 60
73 "*Number of seconds in each demon timestep."
77 ;;; Internal variables.
79 (defvar gnus-demon-timer nil)
80 (defvar gnus-demon-idle-has-been-called nil)
81 (defvar gnus-demon-idle-time 0)
82 (defvar gnus-demon-handler-state nil)
83 (defvar gnus-demon-last-keys nil)
84 (defvar gnus-inhibit-demon nil
85 "*If non-nil, no daemonic function will be run.")
89 (defun gnus-demon-add-handler (function time idle)
90 "Add the handler FUNCTION to be run at TIME and IDLE."
91 ;; First remove any old handlers that use this function.
92 (gnus-demon-remove-handler function)
93 ;; Then add the new one.
94 (push (list function time idle) gnus-demon-handlers)
97 (defun gnus-demon-remove-handler (function &optional no-init)
98 "Remove the handler FUNCTION from the list of handlers."
99 (gnus-pull function gnus-demon-handlers)
103 (defun gnus-demon-init ()
104 "Initialize the Gnus daemon."
107 (when 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)))
122 (gnus-add-shutdown 'gnus-demon-cancel 'gnus)
124 (defun gnus-demon-cancel ()
125 "Cancel any Gnus daemons."
127 (when gnus-demon-timer
128 (nnheader-cancel-timer gnus-demon-timer))
129 (setq gnus-demon-timer nil
130 gnus-demon-idle-has-been-called nil)
132 (nnheader-cancel-function-timers 'gnus-demon)
135 (defun gnus-demon-is-idle-p ()
136 "Whether Emacs is idle or not."
137 ;; We do this simply by comparing the 100 most recent keystrokes
138 ;; with the ones we had last time. If they are the same, one might
139 ;; guess that Emacs is indeed idle. This only makes sense if one
140 ;; calls this function seldom -- like once a minute, which is what
142 (let ((keys (recent-keys)))
143 (or (equal keys gnus-demon-last-keys)
145 (setq gnus-demon-last-keys keys)
148 (defun gnus-demon-time-to-step (time)
149 "Find out how many seconds to TIME, which is on the form \"17:43\"."
150 (if (not (stringp time))
152 (let* ((now (current-time))
153 ;; obtain NOW as discrete components -- make a vector for speed
154 (nowParts (decode-time now))
155 ;; obtain THEN as discrete components
156 (thenParts (parse-time-string time))
157 (thenHour (elt thenParts 2))
158 (thenMin (elt thenParts 1))
159 ;; convert time as elements into number of seconds since EPOCH.
163 ;; If THEN is earlier than NOW, make it
164 ;; same time tomorrow. Doc for encode-time
165 ;; says that this is OK.
167 (if (or (< thenHour (elt nowParts 2))
168 (and (= thenHour (elt nowParts 2))
169 (<= thenMin (elt nowParts 1))))
176 ;; calculate number of seconds between NOW and THEN
177 (diff (+ (* 65536 (- (car then) (car now)))
178 (- (cadr then) (cadr now)))))
179 ;; return number of timesteps in the number of seconds
180 (round (/ diff gnus-demon-timestep)))))
183 "The Gnus daemon that takes care of running all Gnus handlers."
184 ;; Increase or reset the time Emacs has been idle.
185 (if (gnus-demon-is-idle-p)
186 (incf gnus-demon-idle-time)
187 (setq gnus-demon-idle-time 0)
188 (setq gnus-demon-idle-has-been-called nil))
189 ;; Disable all daemonic stuff if we're in the minibuffer
190 (when (and (not (window-minibuffer-p (selected-window)))
191 (not gnus-inhibit-demon))
192 ;; Then we go through all the handler and call those that are
193 ;; sufficiently ripe.
194 (let ((handlers gnus-demon-handler-state)
195 (gnus-inhibit-demon t)
196 ;; Try to avoid dialog boxes, e.g. by Mailcrypt.
197 ;; Unfortunately, Emacs 20's `message-or-box...' doesn't
198 ;; obey `use-dialog-box'.
199 use-dialog-box (last-nonmenu-event 10)
202 (setq handler (pop handlers))
204 ((numberp (setq time (nth 1 handler)))
205 ;; These handlers use a regular timeout mechanism. We decrease
206 ;; the timer if it hasn't reached zero yet.
208 (setcar (nthcdr 1 handler) (decf time)))
209 (and (zerop time) ; If the timer now is zero...
210 ;; Test for appropriate idleness
212 (setq idle (nth 2 handler))
214 ((null idle) t) ; Don't care about idle.
215 ((numberp idle) ; Numerical idle...
216 (< idle gnus-demon-idle-time)) ; Idle timed out.
217 (t (< 0 gnus-demon-idle-time)))) ; Or just need to be idle.
218 ;; So we call the handler.
220 (ignore-errors (funcall (car handler)))
221 ;; And reset the timer.
222 (setcar (nthcdr 1 handler)