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55535639 PJ |
1 | ;;; timer.el --- run a function with args at some time in future |
2 | ||
3 | ;; Copyright (C) 1996 Free Software Foundation, Inc. | |
4 | ||
5 | ;; Maintainer: FSF | |
6 | ||
7 | ;; This file is part of GNU Emacs. | |
8 | ||
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) | |
12 | ;; any later version. | |
13 | ||
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. | |
18 | ||
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. | |
23 | ||
24 | ;;; Commentary: | |
25 | ||
26 | ;; This package gives you the capability to run Emacs Lisp commands at | |
27 | ;; specified times in the future, either as one-shots or periodically. | |
28 | ||
29 | ;;; Code: | |
30 | ||
31 | ;; Layout of a timer vector: | |
32 | ;; [triggered-p high-seconds low-seconds usecs repeat-delay | |
33 | ;; function args idle-delay] | |
34 | ||
35 | (defun timer-create () | |
36 | "Create a timer object." | |
37 | (let ((timer (make-vector 8 nil))) | |
38 | (aset timer 0 t) | |
39 | timer)) | |
40 | ||
41 | (defun timerp (object) | |
42 | "Return t if OBJECT is a timer." | |
43 | (and (vectorp object) (= (length object) 8))) | |
44 | ||
45 | (defun timer-set-time (timer time &optional delta) | |
46 | "Set the trigger time of TIMER to TIME. | |
47 | TIME must be in the internal format returned by, e.g., `current-time'. | |
48 | If optional third argument DELTA is a non-zero integer, make the timer | |
49 | fire repeatedly that many seconds apart." | |
50 | (or (timerp timer) | |
51 | (error "Invalid timer")) | |
52 | (aset timer 1 (car time)) | |
53 | (aset timer 2 (if (consp (cdr time)) (car (cdr time)) (cdr time))) | |
54 | (aset timer 3 (or (and (consp (cdr time)) (consp (cdr (cdr time))) | |
55 | (nth 2 time)) | |
56 | 0)) | |
57 | (aset timer 4 (and (numberp delta) (> delta 0) delta)) | |
58 | timer) | |
59 | ||
60 | (defun timer-set-idle-time (timer secs &optional repeat) | |
61 | "Set the trigger idle time of TIMER to SECS. | |
62 | If optional third argument REPEAT is non-nil, make the timer | |
63 | fire each time Emacs is idle for that many seconds." | |
64 | (or (timerp timer) | |
65 | (error "Invalid timer")) | |
66 | (aset timer 1 0) | |
67 | (aset timer 2 0) | |
68 | (aset timer 3 0) | |
69 | (timer-inc-time timer secs) | |
70 | (aset timer 4 repeat) | |
71 | timer) | |
72 | ||
73 | (defun timer-next-integral-multiple-of-time (time secs) | |
74 | "Yield the next value after TIME that is an integral multiple of SECS. | |
75 | More precisely, the next value, after TIME, that is an integral multiple | |
76 | of SECS seconds since the epoch. SECS may be a fraction." | |
77 | (let ((time-base (ash 1 16))) | |
78 | (if (fboundp 'atan) | |
79 | ;; Use floating point, taking care to not lose precision. | |
80 | (let* ((float-time-base (float time-base)) | |
81 | (million 1000000.0) | |
82 | (time-usec (+ (* million | |
83 | (+ (* float-time-base (nth 0 time)) | |
84 | (nth 1 time))) | |
85 | (nth 2 time))) | |
86 | (secs-usec (* million secs)) | |
87 | (mod-usec (mod time-usec secs-usec)) | |
88 | (next-usec (+ (- time-usec mod-usec) secs-usec)) | |
89 | (time-base-million (* float-time-base million))) | |
90 | (list (floor next-usec time-base-million) | |
91 | (floor (mod next-usec time-base-million) million) | |
92 | (floor (mod next-usec million)))) | |
93 | ;; Floating point is not supported. | |
94 | ;; Use integer arithmetic, avoiding overflow if possible. | |
95 | (let* ((mod-sec (mod (+ (* (mod time-base secs) | |
96 | (mod (nth 0 time) secs)) | |
97 | (nth 1 time)) | |
98 | secs)) | |
99 | (next-1-sec (+ (- (nth 1 time) mod-sec) secs))) | |
100 | (list (+ (nth 0 time) (floor next-1-sec time-base)) | |
101 | (mod next-1-sec time-base) | |
102 | 0))))) | |
103 | ||
104 | (defun timer-relative-time (time secs &optional usecs) | |
105 | "Advance TIME by SECS seconds and optionally USECS microseconds. | |
106 | SECS may be a fraction." | |
107 | (let ((high (car time)) | |
108 | (low (if (consp (cdr time)) (nth 1 time) (cdr time))) | |
109 | (micro (if (numberp (car-safe (cdr-safe (cdr time)))) | |
110 | (nth 2 time) | |
111 | 0))) | |
112 | ;; Add | |
113 | (if usecs (setq micro (+ micro usecs))) | |
114 | (if (floatp secs) | |
115 | (setq micro (+ micro (floor (* 1000000 (- secs (floor secs))))))) | |
116 | (setq low (+ low (floor secs))) | |
117 | ||
118 | ;; Normalize | |
e5da45fd GM |
119 | ;; `/' rounds towards zero while `mod' returns a positive number, |
120 | ;; so we can't rely on (= a (+ (* 100 (/ a 100)) (mod a 100))). | |
121 | (setq low (+ low (/ micro 1000000) (if (< micro 0) -1 0))) | |
55535639 | 122 | (setq micro (mod micro 1000000)) |
e5da45fd | 123 | (setq high (+ high (/ low 65536) (if (< low 0) -1 0))) |
55535639 PJ |
124 | (setq low (logand low 65535)) |
125 | ||
126 | (list high low (and (/= micro 0) micro)))) | |
127 | ||
128 | (defun timer-inc-time (timer secs &optional usecs) | |
129 | "Increment the time set in TIMER by SECS seconds and USECS microseconds. | |
130 | SECS may be a fraction." | |
131 | (let ((time (timer-relative-time | |
132 | (list (aref timer 1) (aref timer 2) (aref timer 3)) | |
133 | secs | |
134 | usecs))) | |
135 | (aset timer 1 (nth 0 time)) | |
136 | (aset timer 2 (nth 1 time)) | |
137 | (aset timer 3 (or (nth 2 time) 0)))) | |
138 | ||
139 | (defun timer-set-time-with-usecs (timer time usecs &optional delta) | |
140 | "Set the trigger time of TIMER to TIME. | |
141 | TIME must be in the internal format returned by, e.g., `current-time'. | |
142 | If optional third argument DELTA is a non-zero integer, make the timer | |
143 | fire repeatedly that many seconds apart." | |
144 | (or (timerp timer) | |
145 | (error "Invalid timer")) | |
146 | (aset timer 1 (car time)) | |
147 | (aset timer 2 (if (consp (cdr time)) (car (cdr time)) (cdr time))) | |
148 | (aset timer 3 usecs) | |
149 | (aset timer 4 (and (numberp delta) (> delta 0) delta)) | |
150 | timer) | |
151 | ||
152 | (defun timer-set-function (timer function &optional args) | |
153 | "Make TIMER call FUNCTION with optional ARGS when triggering." | |
154 | (or (timerp timer) | |
155 | (error "Invalid timer")) | |
156 | (aset timer 5 function) | |
157 | (aset timer 6 args) | |
158 | timer) | |
159 | \f | |
160 | (defun timer-activate (timer) | |
161 | "Put TIMER on the list of active timers." | |
162 | (if (and (timerp timer) | |
163 | (integerp (aref timer 1)) | |
164 | (integerp (aref timer 2)) | |
165 | (integerp (aref timer 3)) | |
166 | (aref timer 5)) | |
167 | (let ((timers timer-list) | |
168 | last) | |
169 | ;; Skip all timers to trigger before the new one. | |
170 | (while (and timers | |
171 | (or (> (aref timer 1) (aref (car timers) 1)) | |
172 | (and (= (aref timer 1) (aref (car timers) 1)) | |
173 | (> (aref timer 2) (aref (car timers) 2))) | |
174 | (and (= (aref timer 1) (aref (car timers) 1)) | |
175 | (= (aref timer 2) (aref (car timers) 2)) | |
176 | (> (aref timer 3) (aref (car timers) 3))))) | |
177 | (setq last timers | |
178 | timers (cdr timers))) | |
179 | ;; Insert new timer after last which possibly means in front of queue. | |
180 | (if last | |
181 | (setcdr last (cons timer timers)) | |
182 | (setq timer-list (cons timer timers))) | |
183 | (aset timer 0 nil) | |
184 | (aset timer 7 nil) | |
185 | nil) | |
186 | (error "Invalid or uninitialized timer"))) | |
187 | ||
188 | (defun timer-activate-when-idle (timer &optional dont-wait) | |
189 | "Arrange to activate TIMER whenever Emacs is next idle. | |
190 | If optional argument DONT-WAIT is non-nil, then enable the | |
191 | timer to activate immediately, or at the right time, if Emacs | |
192 | is already idle." | |
193 | (if (and (timerp timer) | |
194 | (integerp (aref timer 1)) | |
195 | (integerp (aref timer 2)) | |
196 | (integerp (aref timer 3)) | |
197 | (aref timer 5)) | |
198 | (let ((timers timer-idle-list) | |
199 | last) | |
200 | ;; Skip all timers to trigger before the new one. | |
201 | (while (and timers | |
202 | (or (> (aref timer 1) (aref (car timers) 1)) | |
203 | (and (= (aref timer 1) (aref (car timers) 1)) | |
204 | (> (aref timer 2) (aref (car timers) 2))) | |
205 | (and (= (aref timer 1) (aref (car timers) 1)) | |
206 | (= (aref timer 2) (aref (car timers) 2)) | |
207 | (> (aref timer 3) (aref (car timers) 3))))) | |
208 | (setq last timers | |
209 | timers (cdr timers))) | |
210 | ;; Insert new timer after last which possibly means in front of queue. | |
211 | (if last | |
212 | (setcdr last (cons timer timers)) | |
213 | (setq timer-idle-list (cons timer timers))) | |
214 | (aset timer 0 (not dont-wait)) | |
215 | (aset timer 7 t) | |
216 | nil) | |
217 | (error "Invalid or uninitialized timer"))) | |
218 | ||
219 | ;;;###autoload | |
220 | (defalias 'disable-timeout 'cancel-timer) | |
221 | ;;;###autoload | |
222 | (defun cancel-timer (timer) | |
223 | "Remove TIMER from the list of active timers." | |
224 | (or (timerp timer) | |
225 | (error "Invalid timer")) | |
226 | (setq timer-list (delq timer timer-list)) | |
227 | (setq timer-idle-list (delq timer timer-idle-list)) | |
228 | nil) | |
229 | ||
230 | ;;;###autoload | |
231 | (defun cancel-function-timers (function) | |
232 | "Cancel all timers scheduled by `run-at-time' which would run FUNCTION." | |
233 | (interactive "aCancel timers of function: ") | |
234 | (let ((tail timer-list)) | |
235 | (while tail | |
236 | (if (eq (aref (car tail) 5) function) | |
237 | (setq timer-list (delq (car tail) timer-list))) | |
238 | (setq tail (cdr tail)))) | |
239 | (let ((tail timer-idle-list)) | |
240 | (while tail | |
241 | (if (eq (aref (car tail) 5) function) | |
242 | (setq timer-idle-list (delq (car tail) timer-idle-list))) | |
243 | (setq tail (cdr tail))))) | |
244 | \f | |
245 | ;; Record the last few events, for debugging. | |
246 | (defvar timer-event-last-2 nil) | |
247 | (defvar timer-event-last-1 nil) | |
248 | (defvar timer-event-last nil) | |
249 | ||
250 | (defvar timer-max-repeats 10 | |
251 | "*Maximum number of times to repeat a timer, if real time jumps.") | |
252 | ||
253 | (defun timer-until (timer time) | |
254 | "Calculate number of seconds from when TIMER will run, until TIME. | |
255 | TIMER is a timer, and stands for the time when its next repeat is scheduled. | |
256 | TIME is a time-list." | |
257 | (let ((high (- (car time) (aref timer 1))) | |
258 | (low (- (nth 1 time) (aref timer 2)))) | |
259 | (+ low (* high 65536)))) | |
260 | ||
261 | (defun timer-event-handler (timer) | |
262 | "Call the handler for the timer TIMER. | |
263 | This function is called, by name, directly by the C code." | |
264 | (setq timer-event-last-2 timer-event-last-1) | |
265 | (setq timer-event-last-1 timer-event-last) | |
266 | (setq timer-event-last timer) | |
267 | (let ((inhibit-quit t)) | |
268 | (if (timerp timer) | |
269 | (progn | |
270 | ;; Delete from queue. | |
271 | (cancel-timer timer) | |
272 | ;; Re-schedule if requested. | |
273 | (if (aref timer 4) | |
274 | (if (aref timer 7) | |
275 | (timer-activate-when-idle timer) | |
276 | (timer-inc-time timer (aref timer 4) 0) | |
277 | ;; If real time has jumped forward, | |
278 | ;; perhaps because Emacs was suspended for a long time, | |
279 | ;; limit how many times things get repeated. | |
280 | (if (and (numberp timer-max-repeats) | |
281 | (< 0 (timer-until timer (current-time)))) | |
282 | (let ((repeats (/ (timer-until timer (current-time)) | |
283 | (aref timer 4)))) | |
284 | (if (> repeats timer-max-repeats) | |
285 | (timer-inc-time timer (* (aref timer 4) repeats))))) | |
286 | (timer-activate timer))) | |
287 | ;; Run handler. | |
288 | ;; We do this after rescheduling so that the handler function | |
289 | ;; can cancel its own timer successfully with cancel-timer. | |
290 | (condition-case nil | |
291 | (apply (aref timer 5) (aref timer 6)) | |
292 | (error nil))) | |
293 | (error "Bogus timer event")))) | |
294 | ||
295 | ;; This function is incompatible with the one in levents.el. | |
296 | (defun timeout-event-p (event) | |
297 | "Non-nil if EVENT is a timeout event." | |
298 | (and (listp event) (eq (car event) 'timer-event))) | |
299 | \f | |
300 | ;;;###autoload | |
301 | (defun run-at-time (time repeat function &rest args) | |
302 | "Perform an action at time TIME. | |
303 | Repeat the action every REPEAT seconds, if REPEAT is non-nil. | |
304 | TIME should be a string like \"11:23pm\", nil meaning now, a number of seconds | |
305 | from now, a value from `current-time', or t (with non-nil REPEAT) | |
306 | meaning the next integral multiple of REPEAT. | |
307 | REPEAT may be an integer or floating point number. | |
308 | The action is to call FUNCTION with arguments ARGS. | |
309 | ||
310 | This function returns a timer object which you can use in `cancel-timer'." | |
311 | (interactive "sRun at time: \nNRepeat interval: \naFunction: ") | |
312 | ||
313 | (or (null repeat) | |
314 | (and (numberp repeat) (< 0 repeat)) | |
315 | (error "Invalid repetition interval")) | |
316 | ||
317 | ;; Special case: nil means "now" and is useful when repeating. | |
318 | (if (null time) | |
319 | (setq time (current-time))) | |
320 | ||
321 | ;; Special case: t means the next integral multiple of REPEAT. | |
322 | (if (and (eq time t) repeat) | |
323 | (setq time (timer-next-integral-multiple-of-time (current-time) repeat))) | |
324 | ||
325 | ;; Handle numbers as relative times in seconds. | |
326 | (if (numberp time) | |
327 | (setq time (timer-relative-time (current-time) time))) | |
328 | ||
329 | ;; Handle relative times like "2 hours and 35 minutes" | |
330 | (if (stringp time) | |
331 | (let ((secs (timer-duration time))) | |
332 | (if secs | |
333 | (setq time (timer-relative-time (current-time) secs))))) | |
334 | ||
335 | ;; Handle "11:23pm" and the like. Interpret it as meaning today | |
336 | ;; which admittedly is rather stupid if we have passed that time | |
337 | ;; already. (Though only Emacs hackers hack Emacs at that time.) | |
338 | (if (stringp time) | |
339 | (progn | |
340 | (require 'diary-lib) | |
341 | (let ((hhmm (diary-entry-time time)) | |
342 | (now (decode-time))) | |
343 | (if (>= hhmm 0) | |
344 | (setq time | |
345 | (encode-time 0 (% hhmm 100) (/ hhmm 100) (nth 3 now) | |
346 | (nth 4 now) (nth 5 now) (nth 8 now))))))) | |
347 | ||
348 | (or (consp time) | |
349 | (error "Invalid time format")) | |
350 | ||
351 | (let ((timer (timer-create))) | |
352 | (timer-set-time timer time repeat) | |
353 | (timer-set-function timer function args) | |
354 | (timer-activate timer) | |
355 | timer)) | |
356 | ||
357 | ;;;###autoload | |
358 | (defun run-with-timer (secs repeat function &rest args) | |
359 | "Perform an action after a delay of SECS seconds. | |
360 | Repeat the action every REPEAT seconds, if REPEAT is non-nil. | |
361 | SECS and REPEAT may be integers or floating point numbers. | |
362 | The action is to call FUNCTION with arguments ARGS. | |
363 | ||
364 | This function returns a timer object which you can use in `cancel-timer'." | |
365 | (interactive "sRun after delay (seconds): \nNRepeat interval: \naFunction: ") | |
366 | (apply 'run-at-time secs repeat function args)) | |
367 | ||
368 | ;;;###autoload | |
369 | (defun add-timeout (secs function object &optional repeat) | |
370 | "Add a timer to run SECS seconds from now, to call FUNCTION on OBJECT. | |
371 | If REPEAT is non-nil, repeat the timer every REPEAT seconds. | |
372 | This function is for compatibility; see also `run-with-timer'." | |
373 | (run-with-timer secs repeat function object)) | |
374 | ||
375 | ;;;###autoload | |
376 | (defun run-with-idle-timer (secs repeat function &rest args) | |
377 | "Perform an action the next time Emacs is idle for SECS seconds. | |
378 | The action is to call FUNCTION with arguments ARGS. | |
379 | SECS may be an integer or a floating point number. | |
380 | ||
381 | If REPEAT is non-nil, do the action each time Emacs has been idle for | |
382 | exactly SECS seconds (that is, only once for each time Emacs becomes idle). | |
383 | ||
384 | This function returns a timer object which you can use in `cancel-timer'." | |
385 | (interactive | |
386 | (list (read-from-minibuffer "Run after idle (seconds): " nil nil t) | |
387 | (y-or-n-p "Repeat each time Emacs is idle? ") | |
388 | (intern (completing-read "Function: " obarray 'fboundp t)))) | |
389 | (let ((timer (timer-create))) | |
390 | (timer-set-function timer function args) | |
391 | (timer-set-idle-time timer secs repeat) | |
392 | (timer-activate-when-idle timer) | |
393 | timer)) | |
394 | \f | |
395 | (defun with-timeout-handler (tag) | |
396 | (throw tag 'timeout)) | |
397 | ||
398 | ;;;###autoload (put 'with-timeout 'lisp-indent-function 1) | |
399 | ||
400 | ;;;###autoload | |
401 | (defmacro with-timeout (list &rest body) | |
402 | "Run BODY, but if it doesn't finish in SECONDS seconds, give up. | |
403 | If we give up, we run the TIMEOUT-FORMS and return the value of the last one. | |
404 | The call should look like: | |
405 | (with-timeout (SECONDS TIMEOUT-FORMS...) BODY...) | |
406 | The timeout is checked whenever Emacs waits for some kind of external | |
407 | event \(such as keyboard input, input from subprocesses, or a certain time); | |
408 | if the program loops without waiting in any way, the timeout will not | |
409 | be detected." | |
410 | (let ((seconds (car list)) | |
411 | (timeout-forms (cdr list))) | |
412 | `(let ((with-timeout-tag (cons nil nil)) | |
413 | with-timeout-value with-timeout-timer) | |
414 | (if (catch with-timeout-tag | |
415 | (progn | |
416 | (setq with-timeout-timer | |
417 | (run-with-timer ,seconds nil | |
418 | 'with-timeout-handler | |
419 | with-timeout-tag)) | |
420 | (setq with-timeout-value (progn . ,body)) | |
421 | nil)) | |
422 | (progn . ,timeout-forms) | |
423 | (cancel-timer with-timeout-timer) | |
424 | with-timeout-value)))) | |
425 | ||
426 | (defun y-or-n-p-with-timeout (prompt seconds default-value) | |
427 | "Like (y-or-n-p PROMPT), with a timeout. | |
428 | If the user does not answer after SECONDS seconds, return DEFAULT-VALUE." | |
429 | (with-timeout (seconds default-value) | |
430 | (y-or-n-p prompt))) | |
431 | \f | |
432 | (defvar timer-duration-words | |
433 | (list (cons "microsec" 0.000001) | |
434 | (cons "microsecond" 0.000001) | |
435 | (cons "millisec" 0.001) | |
436 | (cons "millisecond" 0.001) | |
437 | (cons "sec" 1) | |
438 | (cons "second" 1) | |
439 | (cons "min" 60) | |
440 | (cons "minute" 60) | |
441 | (cons "hour" (* 60 60)) | |
442 | (cons "day" (* 24 60 60)) | |
443 | (cons "week" (* 7 24 60 60)) | |
444 | (cons "fortnight" (* 14 24 60 60)) | |
445 | (cons "month" (* 30 24 60 60)) ; Approximation | |
446 | (cons "year" (* 365.25 24 60 60)) ; Approximation | |
447 | ) | |
448 | "Alist mapping temporal words to durations in seconds") | |
449 | ||
450 | (defun timer-duration (string) | |
451 | "Return number of seconds specified by STRING, or nil if parsing fails." | |
452 | (let ((secs 0) | |
453 | (start 0) | |
454 | (case-fold-search t)) | |
455 | (while (string-match | |
456 | "[ \t]*\\([0-9.]+\\)?[ \t]*\\([a-z]+[a-rt-z]\\)s?[ \t]*" | |
457 | string start) | |
458 | (let ((count (if (match-beginning 1) | |
459 | (string-to-number (match-string 1 string)) | |
460 | 1)) | |
461 | (itemsize (cdr (assoc (match-string 2 string) | |
462 | timer-duration-words)))) | |
463 | (if itemsize | |
464 | (setq start (match-end 0) | |
465 | secs (+ secs (* count itemsize))) | |
466 | (setq secs nil | |
467 | start (length string))))) | |
468 | (if (= start (length string)) | |
469 | secs | |
470 | (if (string-match "\\`[0-9.]+\\'" string) | |
471 | (string-to-number string))))) | |
472 | \f | |
473 | (provide 'timer) | |
474 | ||
475 | ;;; timer.el ends here |