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dbbee52991
(cancel-timer-internal): New function. (timer-event-handler): Use cancel-timer-internal, and pass the cell it returns to timer-activate...
541 lines
19 KiB
EmacsLisp
541 lines
19 KiB
EmacsLisp
;;; timer.el --- run a function with args at some time in future
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;; Copyright (C) 1996, 2002, 2003, 2004, 2005 Free Software Foundation, Inc.
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;; Maintainer: FSF
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;; This file is part of GNU Emacs.
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;; GNU Emacs is free software; you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation; either version 2, or (at your option)
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;; any later version.
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;; GNU Emacs is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;; You should have received a copy of the GNU General Public License
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;; along with GNU Emacs; see the file COPYING. If not, write to the
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;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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;; Boston, MA 02110-1301, USA.
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;;; Commentary:
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;; This package gives you the capability to run Emacs Lisp commands at
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;; specified times in the future, either as one-shots or periodically.
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;;; Code:
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;; Layout of a timer vector:
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;; [triggered-p high-seconds low-seconds usecs repeat-delay
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;; function args idle-delay]
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(defun timer-create ()
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"Create a timer object."
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(let ((timer (make-vector 8 nil)))
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(aset timer 0 t)
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timer))
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(defun timerp (object)
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"Return t if OBJECT is a timer."
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(and (vectorp object) (= (length object) 8)))
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(defun timer-set-time (timer time &optional delta)
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"Set the trigger time of TIMER to TIME.
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TIME must be in the internal format returned by, e.g., `current-time'.
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If optional third argument DELTA is a positive number, make the timer
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fire repeatedly that many seconds apart."
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(or (timerp timer)
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(error "Invalid timer"))
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(aset timer 1 (car time))
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(aset timer 2 (if (consp (cdr time)) (car (cdr time)) (cdr time)))
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(aset timer 3 (or (and (consp (cdr time)) (consp (cdr (cdr time)))
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(nth 2 time))
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0))
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(aset timer 4 (and (numberp delta) (> delta 0) delta))
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timer)
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(defun timer-set-idle-time (timer secs &optional repeat)
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"Set the trigger idle time of TIMER to SECS.
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If optional third argument REPEAT is non-nil, make the timer
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fire each time Emacs is idle for that many seconds."
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(or (timerp timer)
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(error "Invalid timer"))
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(aset timer 1 0)
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(aset timer 2 0)
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(aset timer 3 0)
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(timer-inc-time timer secs)
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(aset timer 4 repeat)
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timer)
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(defun timer-next-integral-multiple-of-time (time secs)
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"Yield the next value after TIME that is an integral multiple of SECS.
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More precisely, the next value, after TIME, that is an integral multiple
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of SECS seconds since the epoch. SECS may be a fraction."
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(let ((time-base (ash 1 16)))
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(if (fboundp 'atan)
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;; Use floating point, taking care to not lose precision.
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(let* ((float-time-base (float time-base))
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(million 1000000.0)
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(time-usec (+ (* million
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(+ (* float-time-base (nth 0 time))
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(nth 1 time)))
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(nth 2 time)))
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(secs-usec (* million secs))
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(mod-usec (mod time-usec secs-usec))
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(next-usec (+ (- time-usec mod-usec) secs-usec))
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(time-base-million (* float-time-base million)))
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(list (floor next-usec time-base-million)
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(floor (mod next-usec time-base-million) million)
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(floor (mod next-usec million))))
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;; Floating point is not supported.
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;; Use integer arithmetic, avoiding overflow if possible.
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(let* ((mod-sec (mod (+ (* (mod time-base secs)
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(mod (nth 0 time) secs))
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(nth 1 time))
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secs))
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(next-1-sec (+ (- (nth 1 time) mod-sec) secs)))
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(list (+ (nth 0 time) (floor next-1-sec time-base))
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(mod next-1-sec time-base)
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0)))))
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(defun timer-relative-time (time secs &optional usecs)
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"Advance TIME by SECS seconds and optionally USECS microseconds.
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SECS may be a fraction."
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(let ((high (car time))
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(low (if (consp (cdr time)) (nth 1 time) (cdr time)))
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(micro (if (numberp (car-safe (cdr-safe (cdr time))))
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(nth 2 time)
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0)))
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;; Add
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(if usecs (setq micro (+ micro usecs)))
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(if (floatp secs)
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(setq micro (+ micro (floor (* 1000000 (- secs (floor secs)))))))
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(setq low (+ low (floor secs)))
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;; Normalize
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;; `/' rounds towards zero while `mod' returns a positive number,
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;; so we can't rely on (= a (+ (* 100 (/ a 100)) (mod a 100))).
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(setq low (+ low (/ micro 1000000) (if (< micro 0) -1 0)))
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(setq micro (mod micro 1000000))
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(setq high (+ high (/ low 65536) (if (< low 0) -1 0)))
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(setq low (logand low 65535))
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(list high low (and (/= micro 0) micro))))
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(defun timer-inc-time (timer secs &optional usecs)
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"Increment the time set in TIMER by SECS seconds and USECS microseconds.
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SECS may be a fraction. If USECS is omitted, that means it is zero."
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(let ((time (timer-relative-time
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(list (aref timer 1) (aref timer 2) (aref timer 3))
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secs
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usecs)))
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(aset timer 1 (nth 0 time))
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(aset timer 2 (nth 1 time))
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(aset timer 3 (or (nth 2 time) 0))))
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(defun timer-set-time-with-usecs (timer time usecs &optional delta)
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"Set the trigger time of TIMER to TIME plus USECS.
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TIME must be in the internal format returned by, e.g., `current-time'.
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The microsecond count from TIME is ignored, and USECS is used instead.
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If optional fourth argument DELTA is a positive number, make the timer
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fire repeatedly that many seconds apart."
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(or (timerp timer)
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(error "Invalid timer"))
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(aset timer 1 (nth 0 time))
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(aset timer 2 (nth 1 time))
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(aset timer 3 usecs)
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(aset timer 4 (and (numberp delta) (> delta 0) delta))
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timer)
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(make-obsolete 'timer-set-time-with-usecs
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"use `timer-set-time' and `timer-inc-time' instead."
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"22.1")
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(defun timer-set-function (timer function &optional args)
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"Make TIMER call FUNCTION with optional ARGS when triggering."
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(or (timerp timer)
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(error "Invalid timer"))
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(aset timer 5 function)
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(aset timer 6 args)
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timer)
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(defun timer-activate (timer &optional triggered-p reuse-cell)
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"Put TIMER on the list of active timers.
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REUSE-CELL, if non-nil, is a cons cell to reuse instead
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of allocating a new one."
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(if (and (timerp timer)
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(integerp (aref timer 1))
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(integerp (aref timer 2))
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(integerp (aref timer 3))
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(aref timer 5))
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(let ((timers timer-list)
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last)
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;; Skip all timers to trigger before the new one.
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(while (and timers
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(or (> (aref timer 1) (aref (car timers) 1))
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(and (= (aref timer 1) (aref (car timers) 1))
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(> (aref timer 2) (aref (car timers) 2)))
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(and (= (aref timer 1) (aref (car timers) 1))
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(= (aref timer 2) (aref (car timers) 2))
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(> (aref timer 3) (aref (car timers) 3)))))
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(setq last timers
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timers (cdr timers)))
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(if reuse-cell
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(progn
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(setcar reuse-cell timer)
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(setcdr reuse-cell timers))
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(setq reuse-cell (cons timer timers)))
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;; Insert new timer after last which possibly means in front of queue.
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(if last
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(setcdr last reuse-cell)
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(setq timer-list reuse-cell))
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(aset timer 0 triggered-p)
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(aset timer 7 nil)
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nil)
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(error "Invalid or uninitialized timer")))
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(defun timer-activate-when-idle (timer &optional dont-wait reuse-cell)
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"Arrange to activate TIMER whenever Emacs is next idle.
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If optional argument DONT-WAIT is non-nil, then enable the
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timer to activate immediately, or at the right time, if Emacs
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is already idle.
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REUSE-CELL, if non-nil, is a cons cell to reuse instead
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of allocating a new one."
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(if (and (timerp timer)
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(integerp (aref timer 1))
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(integerp (aref timer 2))
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(integerp (aref timer 3))
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(aref timer 5))
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(let ((timers timer-idle-list)
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last)
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;; Skip all timers to trigger before the new one.
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(while (and timers
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(or (> (aref timer 1) (aref (car timers) 1))
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(and (= (aref timer 1) (aref (car timers) 1))
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(> (aref timer 2) (aref (car timers) 2)))
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(and (= (aref timer 1) (aref (car timers) 1))
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(= (aref timer 2) (aref (car timers) 2))
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(> (aref timer 3) (aref (car timers) 3)))))
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(setq last timers
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timers (cdr timers)))
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(if reuse-cell
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(progn
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(setcar reuse-cell timer)
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(setcdr reuse-cell timers))
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(setq reuse-cell (cons timer timers)))
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;; Insert new timer after last which possibly means in front of queue.
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(if last
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(setcdr last reuse-cell)
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(setq timer-idle-list reuse-cell))
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(aset timer 0 (not dont-wait))
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(aset timer 7 t)
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nil)
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(error "Invalid or uninitialized timer")))
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;;;###autoload
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(defalias 'disable-timeout 'cancel-timer)
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;;;###autoload
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(defun cancel-timer (timer)
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"Remove TIMER from the list of active timers."
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(or (timerp timer)
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(error "Invalid timer"))
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(setq timer-list (delq timer timer-list))
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(setq timer-idle-list (delq timer timer-idle-list))
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nil)
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;; Remove TIMER from the list of active timers or idle timers.
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;; Only to be used in this file. It returns the cons cell
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;; that was removed from the list.
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(defun cancel-timer-internal (timer)
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(let ((cell1 (memq timer timer-list))
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(cell2 (memq timer timer-idle-list)))
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(if cell1
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(setq timer-list (delq timer timer-list)))
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(if cell2
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(setq timer-idle-list (delq timer timer-idle-list)))
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(or cell1 cell2)))
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;;;###autoload
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(defun cancel-function-timers (function)
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"Cancel all timers scheduled by `run-at-time' which would run FUNCTION."
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(interactive "aCancel timers of function: ")
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(let ((tail timer-list))
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(while tail
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(if (eq (aref (car tail) 5) function)
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(setq timer-list (delq (car tail) timer-list)))
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(setq tail (cdr tail))))
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(let ((tail timer-idle-list))
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(while tail
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(if (eq (aref (car tail) 5) function)
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(setq timer-idle-list (delq (car tail) timer-idle-list)))
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(setq tail (cdr tail)))))
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;; Record the last few events, for debugging.
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(defvar timer-event-last-2 nil)
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(defvar timer-event-last-1 nil)
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(defvar timer-event-last nil)
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(defvar timer-max-repeats 10
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"*Maximum number of times to repeat a timer, if real time jumps.")
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(defun timer-until (timer time)
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"Calculate number of seconds from when TIMER will run, until TIME.
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TIMER is a timer, and stands for the time when its next repeat is scheduled.
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TIME is a time-list."
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(let ((high (- (car time) (aref timer 1)))
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(low (- (nth 1 time) (aref timer 2))))
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(+ low (* high 65536))))
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(defun timer-event-handler (timer)
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"Call the handler for the timer TIMER.
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This function is called, by name, directly by the C code."
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(setq timer-event-last-2 timer-event-last-1)
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(setq timer-event-last-1 timer-event-last)
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(setq timer-event-last timer)
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(let ((inhibit-quit t))
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(if (timerp timer)
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(let (retrigger cell)
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;; Delete from queue. Record the cons cell that was used.
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(setq cell (cancel-timer-internal timer))
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;; Re-schedule if requested.
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(if (aref timer 4)
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(if (aref timer 7)
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(timer-activate-when-idle timer nil cell)
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(timer-inc-time timer (aref timer 4) 0)
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;; If real time has jumped forward,
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;; perhaps because Emacs was suspended for a long time,
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;; limit how many times things get repeated.
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(if (and (numberp timer-max-repeats)
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(< 0 (timer-until timer (current-time))))
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(let ((repeats (/ (timer-until timer (current-time))
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(aref timer 4))))
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(if (> repeats timer-max-repeats)
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(timer-inc-time timer (* (aref timer 4) repeats)))))
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(timer-activate timer t cell)
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(setq retrigger t)))
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;; Run handler.
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;; We do this after rescheduling so that the handler function
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;; can cancel its own timer successfully with cancel-timer.
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(condition-case nil
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(apply (aref timer 5) (aref timer 6))
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(error nil))
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(if retrigger
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(aset timer 0 nil)))
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(error "Bogus timer event"))))
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;; This function is incompatible with the one in levents.el.
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(defun timeout-event-p (event)
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"Non-nil if EVENT is a timeout event."
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(and (listp event) (eq (car event) 'timer-event)))
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;;;###autoload
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(defun run-at-time (time repeat function &rest args)
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"Perform an action at time TIME.
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Repeat the action every REPEAT seconds, if REPEAT is non-nil.
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TIME should be a string like \"11:23pm\", nil meaning now, a number of seconds
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from now, a value from `current-time', or t (with non-nil REPEAT)
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meaning the next integral multiple of REPEAT.
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REPEAT may be an integer or floating point number.
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The action is to call FUNCTION with arguments ARGS.
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This function returns a timer object which you can use in `cancel-timer'."
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(interactive "sRun at time: \nNRepeat interval: \naFunction: ")
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(or (null repeat)
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(and (numberp repeat) (< 0 repeat))
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(error "Invalid repetition interval"))
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;; Special case: nil means "now" and is useful when repeating.
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(if (null time)
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(setq time (current-time)))
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;; Special case: t means the next integral multiple of REPEAT.
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(if (and (eq time t) repeat)
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(setq time (timer-next-integral-multiple-of-time (current-time) repeat)))
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;; Handle numbers as relative times in seconds.
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(if (numberp time)
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(setq time (timer-relative-time (current-time) time)))
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;; Handle relative times like "2 hours and 35 minutes"
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(if (stringp time)
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(let ((secs (timer-duration time)))
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(if secs
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(setq time (timer-relative-time (current-time) secs)))))
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;; Handle "11:23pm" and the like. Interpret it as meaning today
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;; which admittedly is rather stupid if we have passed that time
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;; already. (Though only Emacs hackers hack Emacs at that time.)
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(if (stringp time)
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(progn
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(require 'diary-lib)
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(let ((hhmm (diary-entry-time time))
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(now (decode-time)))
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(if (>= hhmm 0)
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(setq time
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(encode-time 0 (% hhmm 100) (/ hhmm 100) (nth 3 now)
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(nth 4 now) (nth 5 now) (nth 8 now)))))))
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(or (consp time)
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(error "Invalid time format"))
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(let ((timer (timer-create)))
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(timer-set-time timer time repeat)
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(timer-set-function timer function args)
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(timer-activate timer)
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timer))
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;;;###autoload
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(defun run-with-timer (secs repeat function &rest args)
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"Perform an action after a delay of SECS seconds.
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Repeat the action every REPEAT seconds, if REPEAT is non-nil.
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SECS and REPEAT may be integers or floating point numbers.
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The action is to call FUNCTION with arguments ARGS.
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This function returns a timer object which you can use in `cancel-timer'."
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(interactive "sRun after delay (seconds): \nNRepeat interval: \naFunction: ")
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(apply 'run-at-time secs repeat function args))
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;;;###autoload
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(defun add-timeout (secs function object &optional repeat)
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"Add a timer to run SECS seconds from now, to call FUNCTION on OBJECT.
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If REPEAT is non-nil, repeat the timer every REPEAT seconds.
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This function is for compatibility; see also `run-with-timer'."
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(run-with-timer secs repeat function object))
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;;;###autoload
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(defun run-with-idle-timer (secs repeat function &rest args)
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"Perform an action the next time Emacs is idle for SECS seconds.
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The action is to call FUNCTION with arguments ARGS.
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SECS may be an integer or a floating point number.
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If REPEAT is non-nil, do the action each time Emacs has been idle for
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exactly SECS seconds (that is, only once for each time Emacs becomes idle).
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This function returns a timer object which you can use in `cancel-timer'."
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(interactive
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(list (read-from-minibuffer "Run after idle (seconds): " nil nil t)
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(y-or-n-p "Repeat each time Emacs is idle? ")
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(intern (completing-read "Function: " obarray 'fboundp t))))
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(let ((timer (timer-create)))
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(timer-set-function timer function args)
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(timer-set-idle-time timer secs repeat)
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(timer-activate-when-idle timer)
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timer))
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(defun with-timeout-handler (tag)
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(throw tag 'timeout))
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;;;###autoload (put 'with-timeout 'lisp-indent-function 1)
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(defvar with-timeout-timers nil
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"List of all timers used by currently pending `with-timeout' calls.")
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;;;###autoload
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(defmacro with-timeout (list &rest body)
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"Run BODY, but if it doesn't finish in SECONDS seconds, give up.
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If we give up, we run the TIMEOUT-FORMS and return the value of the last one.
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The timeout is checked whenever Emacs waits for some kind of external
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event (such as keyboard input, input from subprocesses, or a certain time);
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if the program loops without waiting in any way, the timeout will not
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be detected.
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\n(fn (SECONDS TIMEOUT-FORMS...) BODY)"
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(let ((seconds (car list))
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(timeout-forms (cdr list)))
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`(let ((with-timeout-tag (cons nil nil))
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with-timeout-value with-timeout-timer
|
||
(with-timeout-timers with-timeout-timers))
|
||
(if (catch with-timeout-tag
|
||
(progn
|
||
(setq with-timeout-timer
|
||
(run-with-timer ,seconds nil
|
||
'with-timeout-handler
|
||
with-timeout-tag))
|
||
(push with-timeout-timer with-timeout-timers)
|
||
(setq with-timeout-value (progn . ,body))
|
||
nil))
|
||
(progn . ,timeout-forms)
|
||
(cancel-timer with-timeout-timer)
|
||
with-timeout-value))))
|
||
|
||
(defun with-timeout-suspend ()
|
||
"Stop the clock for `with-timeout'. Used by debuggers.
|
||
The idea is that the time you spend in the debugger should not
|
||
count against these timeouts.
|
||
|
||
The value is a list that the debugger can pass to `with-timeout-unsuspend'
|
||
when it exits, to make these timers start counting again."
|
||
(mapcar (lambda (timer)
|
||
(cancel-timer timer)
|
||
(list timer
|
||
(time-subtract
|
||
;; The time that this timer will go off.
|
||
(list (aref timer 1) (aref timer 2) (aref timer 3))
|
||
(current-time))))
|
||
with-timeout-timers))
|
||
|
||
(defun with-timeout-unsuspend (timer-spec-list)
|
||
"Restart the clock for `with-timeout'.
|
||
The argument should be a value previously returned by `with-timeout-suspend'."
|
||
(dolist (elt timer-spec-list)
|
||
(let ((timer (car elt))
|
||
(delay (cadr elt)))
|
||
(timer-set-time timer (time-add (current-time) delay))
|
||
(timer-activate timer))))
|
||
|
||
(defun y-or-n-p-with-timeout (prompt seconds default-value)
|
||
"Like (y-or-n-p PROMPT), with a timeout.
|
||
If the user does not answer after SECONDS seconds, return DEFAULT-VALUE."
|
||
(with-timeout (seconds default-value)
|
||
(y-or-n-p prompt)))
|
||
|
||
(defvar timer-duration-words
|
||
(list (cons "microsec" 0.000001)
|
||
(cons "microsecond" 0.000001)
|
||
(cons "millisec" 0.001)
|
||
(cons "millisecond" 0.001)
|
||
(cons "sec" 1)
|
||
(cons "second" 1)
|
||
(cons "min" 60)
|
||
(cons "minute" 60)
|
||
(cons "hour" (* 60 60))
|
||
(cons "day" (* 24 60 60))
|
||
(cons "week" (* 7 24 60 60))
|
||
(cons "fortnight" (* 14 24 60 60))
|
||
(cons "month" (* 30 24 60 60)) ; Approximation
|
||
(cons "year" (* 365.25 24 60 60)) ; Approximation
|
||
)
|
||
"Alist mapping temporal words to durations in seconds")
|
||
|
||
(defun timer-duration (string)
|
||
"Return number of seconds specified by STRING, or nil if parsing fails."
|
||
(let ((secs 0)
|
||
(start 0)
|
||
(case-fold-search t))
|
||
(while (string-match
|
||
"[ \t]*\\([0-9.]+\\)?[ \t]*\\([a-z]+[a-rt-z]\\)s?[ \t]*"
|
||
string start)
|
||
(let ((count (if (match-beginning 1)
|
||
(string-to-number (match-string 1 string))
|
||
1))
|
||
(itemsize (cdr (assoc (match-string 2 string)
|
||
timer-duration-words))))
|
||
(if itemsize
|
||
(setq start (match-end 0)
|
||
secs (+ secs (* count itemsize)))
|
||
(setq secs nil
|
||
start (length string)))))
|
||
(if (= start (length string))
|
||
secs
|
||
(if (string-match "\\`[0-9.]+\\'" string)
|
||
(string-to-number string)))))
|
||
|
||
(provide 'timer)
|
||
|
||
;;; arch-tag: b1a9237b-7787-4382-9e46-8f2c3b3273e0
|
||
;;; timer.el ends here
|