mirror of
https://git.savannah.gnu.org/git/emacs.git
synced 2024-12-27 10:54:40 +00:00
467 lines
16 KiB
EmacsLisp
467 lines
16 KiB
EmacsLisp
;;; timer.el --- run a function with args at some time in future.
|
||
|
||
;; Copyright (C) 1996 Free Software Foundation, Inc.
|
||
|
||
;; Maintainer: FSF
|
||
|
||
;; This file is part of GNU Emacs.
|
||
|
||
;; GNU Emacs is free software; you can redistribute it and/or modify
|
||
;; it under the terms of the GNU General Public License as published by
|
||
;; the Free Software Foundation; either version 2, or (at your option)
|
||
;; any later version.
|
||
|
||
;; GNU Emacs is distributed in the hope that it will be useful,
|
||
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||
;; GNU General Public License for more details.
|
||
|
||
;; You should have received a copy of the GNU General Public License
|
||
;; along with GNU Emacs; see the file COPYING. If not, write to the
|
||
;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
|
||
;; Boston, MA 02111-1307, USA.
|
||
|
||
;;; Commentary:
|
||
|
||
;; This package gives you the capability to run Emacs Lisp commands at
|
||
;; specified times in the future, either as one-shots or periodically.
|
||
|
||
;;; Code:
|
||
|
||
;; Layout of a timer vector:
|
||
;; [triggered-p high-seconds low-seconds usecs repeat-delay
|
||
;; function args idle-delay]
|
||
|
||
(defun timer-create ()
|
||
"Create a timer object."
|
||
(let ((timer (make-vector 8 nil)))
|
||
(aset timer 0 t)
|
||
timer))
|
||
|
||
(defun timerp (object)
|
||
"Return t if OBJECT is a timer."
|
||
(and (vectorp object) (= (length object) 8)))
|
||
|
||
(defun timer-set-time (timer time &optional delta)
|
||
"Set the trigger time of TIMER to TIME.
|
||
TIME must be in the internal format returned by, e.g., `current-time'.
|
||
If optional third argument DELTA is a non-zero integer, make the timer
|
||
fire repeatedly that many seconds apart."
|
||
(or (timerp timer)
|
||
(error "Invalid timer"))
|
||
(aset timer 1 (car time))
|
||
(aset timer 2 (if (consp (cdr time)) (car (cdr time)) (cdr time)))
|
||
(aset timer 3 (or (and (consp (cdr time)) (consp (cdr (cdr time)))
|
||
(nth 2 time))
|
||
0))
|
||
(aset timer 4 (and (numberp delta) (> delta 0) delta))
|
||
timer)
|
||
|
||
(defun timer-set-idle-time (timer secs &optional repeat)
|
||
"Set the trigger idle time of TIMER to SECS.
|
||
If optional third argument REPEAT is non-nil, make the timer
|
||
fire each time Emacs is idle for that many seconds."
|
||
(or (timerp timer)
|
||
(error "Invalid timer"))
|
||
(aset timer 1 0)
|
||
(aset timer 2 0)
|
||
(aset timer 3 0)
|
||
(timer-inc-time timer secs)
|
||
(aset timer 4 repeat)
|
||
timer)
|
||
|
||
(defun timer-next-integral-multiple-of-time (time secs)
|
||
"Yield the next value after TIME that is an integral multiple of SECS.
|
||
More precisely, the next value, after TIME, that is an integral multiple
|
||
of SECS seconds since the epoch. SECS may be a fraction."
|
||
(let ((time-base (ash 1 16)))
|
||
(if (fboundp 'atan)
|
||
;; Use floating point, taking care to not lose precision.
|
||
(let* ((float-time-base (float time-base))
|
||
(million 1000000.0)
|
||
(time-usec (+ (* million
|
||
(+ (* float-time-base (nth 0 time))
|
||
(nth 1 time)))
|
||
(nth 2 time)))
|
||
(secs-usec (* million secs))
|
||
(mod-usec (mod time-usec secs-usec))
|
||
(next-usec (+ (- time-usec mod-usec) secs-usec))
|
||
(time-base-million (* float-time-base million)))
|
||
(list (floor next-usec time-base-million)
|
||
(floor (mod next-usec time-base-million) million)
|
||
(floor (mod next-usec million))))
|
||
;; Floating point is not supported.
|
||
;; Use integer arithmetic, avoiding overflow if possible.
|
||
(let* ((mod-sec (mod (+ (* (mod time-base secs)
|
||
(mod (nth 0 time) secs))
|
||
(nth 1 time))
|
||
secs))
|
||
(next-1-sec (+ (- (nth 1 time) mod-sec) secs)))
|
||
(list (+ (nth 0 time) (floor next-1-sec time-base))
|
||
(mod next-1-sec time-base)
|
||
0)))))
|
||
|
||
(defun timer-relative-time (time secs &optional usecs)
|
||
"Advance TIME by SECS seconds and optionally USECS microseconds.
|
||
SECS may be a fraction."
|
||
(let ((high (car time))
|
||
(low (if (consp (cdr time)) (nth 1 time) (cdr time)))
|
||
(micro (if (numberp (car-safe (cdr-safe (cdr time))))
|
||
(nth 2 time)
|
||
0)))
|
||
;; Add
|
||
(if usecs (setq micro (+ micro usecs)))
|
||
(if (floatp secs)
|
||
(setq micro (+ micro (floor (* 1000000 (- secs (floor secs)))))))
|
||
(setq low (+ low (floor secs)))
|
||
|
||
;; Normalize
|
||
(setq low (+ low (/ micro 1000000)))
|
||
(setq micro (mod micro 1000000))
|
||
(setq high (+ high (/ low 65536)))
|
||
(setq low (logand low 65535))
|
||
|
||
(list high low (and (/= micro 0) micro))))
|
||
|
||
(defun timer-inc-time (timer secs &optional usecs)
|
||
"Increment the time set in TIMER by SECS seconds and USECS microseconds.
|
||
SECS may be a fraction."
|
||
(let ((time (timer-relative-time
|
||
(list (aref timer 1) (aref timer 2) (aref timer 3))
|
||
secs
|
||
usecs)))
|
||
(aset timer 1 (nth 0 time))
|
||
(aset timer 2 (nth 1 time))
|
||
(aset timer 3 (or (nth 2 time) 0))))
|
||
|
||
(defun timer-set-time-with-usecs (timer time usecs &optional delta)
|
||
"Set the trigger time of TIMER to TIME.
|
||
TIME must be in the internal format returned by, e.g., `current-time'.
|
||
If optional third argument DELTA is a non-zero integer, make the timer
|
||
fire repeatedly that many seconds apart."
|
||
(or (timerp timer)
|
||
(error "Invalid timer"))
|
||
(aset timer 1 (car time))
|
||
(aset timer 2 (if (consp (cdr time)) (car (cdr time)) (cdr time)))
|
||
(aset timer 3 usecs)
|
||
(aset timer 4 (and (numberp delta) (> delta 0) delta))
|
||
timer)
|
||
|
||
(defun timer-set-function (timer function &optional args)
|
||
"Make TIMER call FUNCTION with optional ARGS when triggering."
|
||
(or (timerp timer)
|
||
(error "Invalid timer"))
|
||
(aset timer 5 function)
|
||
(aset timer 6 args)
|
||
timer)
|
||
|
||
(defun timer-activate (timer)
|
||
"Put TIMER on the list of active timers."
|
||
(if (and (timerp timer)
|
||
(integerp (aref timer 1))
|
||
(integerp (aref timer 2))
|
||
(integerp (aref timer 3))
|
||
(aref timer 5))
|
||
(let ((timers timer-list)
|
||
last)
|
||
;; Skip all timers to trigger before the new one.
|
||
(while (and timers
|
||
(or (> (aref timer 1) (aref (car timers) 1))
|
||
(and (= (aref timer 1) (aref (car timers) 1))
|
||
(> (aref timer 2) (aref (car timers) 2)))
|
||
(and (= (aref timer 1) (aref (car timers) 1))
|
||
(= (aref timer 2) (aref (car timers) 2))
|
||
(> (aref timer 3) (aref (car timers) 3)))))
|
||
(setq last timers
|
||
timers (cdr timers)))
|
||
;; Insert new timer after last which possibly means in front of queue.
|
||
(if last
|
||
(setcdr last (cons timer timers))
|
||
(setq timer-list (cons timer timers)))
|
||
(aset timer 0 nil)
|
||
(aset timer 7 nil)
|
||
nil)
|
||
(error "Invalid or uninitialized timer")))
|
||
|
||
(defun timer-activate-when-idle (timer)
|
||
"Arrange to activate TIMER whenever Emacs is next idle."
|
||
(if (and (timerp timer)
|
||
(integerp (aref timer 1))
|
||
(integerp (aref timer 2))
|
||
(integerp (aref timer 3))
|
||
(aref timer 5))
|
||
(let ((timers timer-idle-list)
|
||
last)
|
||
;; Skip all timers to trigger before the new one.
|
||
(while (and timers
|
||
(or (> (aref timer 1) (aref (car timers) 1))
|
||
(and (= (aref timer 1) (aref (car timers) 1))
|
||
(> (aref timer 2) (aref (car timers) 2)))
|
||
(and (= (aref timer 1) (aref (car timers) 1))
|
||
(= (aref timer 2) (aref (car timers) 2))
|
||
(> (aref timer 3) (aref (car timers) 3)))))
|
||
(setq last timers
|
||
timers (cdr timers)))
|
||
;; Insert new timer after last which possibly means in front of queue.
|
||
(if last
|
||
(setcdr last (cons timer timers))
|
||
(setq timer-idle-list (cons timer timers)))
|
||
(aset timer 0 t)
|
||
(aset timer 7 t)
|
||
nil)
|
||
(error "Invalid or uninitialized timer")))
|
||
|
||
;;;###autoload
|
||
(defalias 'disable-timeout 'cancel-timer)
|
||
;;;###autoload
|
||
(defun cancel-timer (timer)
|
||
"Remove TIMER from the list of active timers."
|
||
(or (timerp timer)
|
||
(error "Invalid timer"))
|
||
(setq timer-list (delq timer timer-list))
|
||
(setq timer-idle-list (delq timer timer-idle-list))
|
||
nil)
|
||
|
||
;;;###autoload
|
||
(defun cancel-function-timers (function)
|
||
"Cancel all timers scheduled by `run-at-time' which would run FUNCTION."
|
||
(interactive "aCancel timers of function: ")
|
||
(let ((tail timer-list))
|
||
(while tail
|
||
(if (eq (aref (car tail) 5) function)
|
||
(setq timer-list (delq (car tail) timer-list)))
|
||
(setq tail (cdr tail))))
|
||
(let ((tail timer-idle-list))
|
||
(while tail
|
||
(if (eq (aref (car tail) 5) function)
|
||
(setq timer-idle-list (delq (car tail) timer-idle-list)))
|
||
(setq tail (cdr tail)))))
|
||
|
||
;; Record the last few events, for debugging.
|
||
(defvar timer-event-last-2 nil)
|
||
(defvar timer-event-last-1 nil)
|
||
(defvar timer-event-last nil)
|
||
|
||
(defvar timer-max-repeats 10
|
||
"*Maximum number of times to repeat a timer, if real time jumps.")
|
||
|
||
(defun timer-until (timer time)
|
||
"Calculate number of seconds from when TIMER will run, until TIME.
|
||
TIMER is a timer, and stands for the time when its next repeat is scheduled.
|
||
TIME is a time-list."
|
||
(let ((high (- (car time) (aref timer 1)))
|
||
(low (- (nth 1 time) (aref timer 2))))
|
||
(+ low (* high 65536))))
|
||
|
||
(defun timer-event-handler (timer)
|
||
"Call the handler for the timer TIMER.
|
||
This function is called, by name, directly by the C code."
|
||
(setq timer-event-last-2 timer-event-last-1)
|
||
(setq timer-event-last-1 timer-event-last)
|
||
(setq timer-event-last timer)
|
||
(let ((inhibit-quit t))
|
||
(if (timerp timer)
|
||
(progn
|
||
;; Delete from queue.
|
||
(cancel-timer timer)
|
||
;; Run handler
|
||
(condition-case nil
|
||
(apply (aref timer 5) (aref timer 6))
|
||
(error nil))
|
||
;; Re-schedule if requested.
|
||
(if (aref timer 4)
|
||
(if (aref timer 7)
|
||
(timer-activate-when-idle timer)
|
||
(timer-inc-time timer (aref timer 4) 0)
|
||
;; If real time has jumped forward,
|
||
;; perhaps because Emacs was suspended for a long time,
|
||
;; limit how many times things get repeated.
|
||
(if (and (numberp timer-max-repeats)
|
||
(< 0 (timer-until timer (current-time))))
|
||
(let ((repeats (/ (timer-until timer (current-time))
|
||
(aref timer 4))))
|
||
(if (> repeats timer-max-repeats)
|
||
(timer-inc-time timer (* (aref timer 4) repeats)))))
|
||
(timer-activate timer))))
|
||
(error "Bogus timer event"))))
|
||
|
||
;; This function is incompatible with the one in levents.el.
|
||
(defun timeout-event-p (event)
|
||
"Non-nil if EVENT is a timeout event."
|
||
(and (listp event) (eq (car event) 'timer-event)))
|
||
|
||
;;;###autoload
|
||
(defun run-at-time (time repeat function &rest args)
|
||
"Perform an action at time TIME.
|
||
Repeat the action every REPEAT seconds, if REPEAT is non-nil.
|
||
TIME should be a string like \"11:23pm\", nil meaning now, a number of seconds
|
||
from now, a value from `current-time', or t (with non-nil REPEAT)
|
||
meaning the next integral multiple of REPEAT.
|
||
REPEAT may be an integer or floating point number.
|
||
The action is to call FUNCTION with arguments ARGS.
|
||
|
||
This function returns a timer object which you can use in `cancel-timer'."
|
||
(interactive "sRun at time: \nNRepeat interval: \naFunction: ")
|
||
|
||
(or (null repeat)
|
||
(and (numberp repeat) (< 0 repeat))
|
||
(error "Invalid repetition interval"))
|
||
|
||
;; Special case: nil means "now" and is useful when repeating.
|
||
(if (null time)
|
||
(setq time (current-time)))
|
||
|
||
;; Special case: t means the next integral multiple of REPEAT.
|
||
(if (and (eq time t) repeat)
|
||
(setq time (timer-next-integral-multiple-of-time (current-time) repeat)))
|
||
|
||
;; Handle numbers as relative times in seconds.
|
||
(if (numberp time)
|
||
(setq time (timer-relative-time (current-time) time)))
|
||
|
||
;; Handle relative times like "2 hours and 35 minutes"
|
||
(if (stringp time)
|
||
(let ((secs (timer-duration time)))
|
||
(if secs
|
||
(setq time (timer-relative-time (current-time) secs)))))
|
||
|
||
;; Handle "11:23pm" and the like. Interpret it as meaning today
|
||
;; which admittedly is rather stupid if we have passed that time
|
||
;; already. (Though only Emacs hackers hack Emacs at that time.)
|
||
(if (stringp time)
|
||
(progn
|
||
(require 'diary-lib)
|
||
(let ((hhmm (diary-entry-time time))
|
||
(now (decode-time)))
|
||
(if (>= hhmm 0)
|
||
(setq time
|
||
(encode-time 0 (% hhmm 100) (/ hhmm 100) (nth 3 now)
|
||
(nth 4 now) (nth 5 now) (nth 8 now)))))))
|
||
|
||
(or (consp time)
|
||
(error "Invalid time format"))
|
||
|
||
(let ((timer (timer-create)))
|
||
(timer-set-time timer time repeat)
|
||
(timer-set-function timer function args)
|
||
(timer-activate timer)
|
||
timer))
|
||
|
||
;;;###autoload
|
||
(defun run-with-timer (secs repeat function &rest args)
|
||
"Perform an action after a delay of SECS seconds.
|
||
Repeat the action every REPEAT seconds, if REPEAT is non-nil.
|
||
SECS and REPEAT may be integers or floating point numbers.
|
||
The action is to call FUNCTION with arguments ARGS.
|
||
|
||
This function returns a timer object which you can use in `cancel-timer'."
|
||
(interactive "sRun after delay (seconds): \nNRepeat interval: \naFunction: ")
|
||
(apply 'run-at-time secs repeat function args))
|
||
|
||
;;;###autoload
|
||
(defun add-timeout (secs function object &optional repeat)
|
||
"Add a timer to run SECS seconds from now, to call FUNCTION on OBJECT.
|
||
If REPEAT is non-nil, repeat the timer every REPEAT seconds.
|
||
This function is for compatibility; see also `run-with-timer'."
|
||
(run-with-timer secs repeat function object))
|
||
|
||
;;;###autoload
|
||
(defun run-with-idle-timer (secs repeat function &rest args)
|
||
"Perform an action the next time Emacs is idle for SECS seconds.
|
||
If REPEAT is non-nil, do this each time Emacs is idle for SECS seconds.
|
||
SECS may be an integer or a floating point number.
|
||
The action is to call FUNCTION with arguments ARGS.
|
||
|
||
This function returns a timer object which you can use in `cancel-timer'."
|
||
(interactive
|
||
(list (read-from-minibuffer "Run after idle (seconds): " nil nil t)
|
||
(y-or-n-p "Repeat each time Emacs is idle? ")
|
||
(intern (completing-read "Function: " obarray 'fboundp t))))
|
||
(let ((timer (timer-create)))
|
||
(timer-set-function timer function args)
|
||
(timer-set-idle-time timer secs repeat)
|
||
(timer-activate-when-idle timer)
|
||
timer))
|
||
|
||
(defun with-timeout-handler (tag)
|
||
(throw tag 'timeout))
|
||
|
||
;;;###autoload (put 'with-timeout 'lisp-indent-function 1)
|
||
|
||
;;;###autoload
|
||
(defmacro with-timeout (list &rest body)
|
||
"Run BODY, but if it doesn't finish in SECONDS seconds, give up.
|
||
If we give up, we run the TIMEOUT-FORMS and return the value of the last one.
|
||
The call should look like:
|
||
(with-timeout (SECONDS TIMEOUT-FORMS...) BODY...)
|
||
The timeout is checked whenever Emacs waits for some kind of external
|
||
event \(such as keyboard input, input from subprocesses, or a certain time);
|
||
if the program loops without waiting in any way, the timeout will not
|
||
be detected."
|
||
(let ((seconds (car list))
|
||
(timeout-forms (cdr list)))
|
||
`(let ((with-timeout-tag (cons nil nil))
|
||
with-timeout-value with-timeout-timer)
|
||
(if (catch with-timeout-tag
|
||
(progn
|
||
(setq with-timeout-timer
|
||
(run-with-timer ,seconds nil
|
||
'with-timeout-handler
|
||
with-timeout-tag))
|
||
(setq with-timeout-value (progn . ,body))
|
||
nil))
|
||
(progn . ,timeout-forms)
|
||
(cancel-timer with-timeout-timer)
|
||
with-timeout-value))))
|
||
|
||
(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)
|
||
|
||
;;; timer.el ends here
|