X-Git-Url: http://git.hcoop.net/bpt/emacs.git/blobdiff_plain/dffd3124175845d75c0b35c98a8f7c832137abcc..d420d5b4fe6df6319a5ff150c353dc4eb3050851:/lisp/timer.el

diff --git a/lisp/timer.el b/lisp/timer.el
dissimilarity index 79%
index 1e0211233c..68a9e105da 100644
--- a/lisp/timer.el
+++ b/lisp/timer.el
@@ -1,102 +1,466 @@
-;;; timer.el --- run a function with args at some time in future
-
-;; Copyright (C) 1990, 1993 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, 675 Mass Ave, Cambridge, MA 02139, USA.
-
-;;; Code:
-
-(defvar timer-process nil)
-(defvar timer-alist ())
-(defvar timer-out "")
-(defvar timer-dont-exit nil
-  ;; this is useful for functions which will be doing their own erratic
-  ;; rescheduling or people who otherwise expect to use the process frequently
-  "If non-nil, don't exit the timer process when no more events are pending.")
-
-;;;###autoload
-(defun run-at-time (time repeat function &rest args)
-  "Run a function at a time, and optionally on a regular interval.
-Arguments are TIME, REPEAT, FUNCTION &rest ARGS.
-TIME, a string,  can be specified absolutely or relative to now.
-REPEAT, an integer number of seconds, is the interval on which to repeat
-the call to the function.  If REPEAT is nil, call it just once."
-  (interactive "sRun at time: \nNRepeat interval: \naFunction: ")
-  (cond ((or (not timer-process) 
-             (memq (process-status timer-process) '(exit signal nil)))
-         (if timer-process (delete-process timer-process))
-         (setq timer-process (let ((process-connection-type nil))
-			       (start-process "timer" nil "timer"))
-               timer-alist nil)
-         (set-process-filter   timer-process 'timer-process-filter)
-         (set-process-sentinel timer-process 'timer-process-sentinel)
-         (process-kill-without-query timer-process))
-        ((eq (process-status timer-process) 'stop)
-         (continue-process timer-process)))
-  ;; There should be a living, breathing timer process now
-  (let ((token (concat (current-time-string) "-" (length timer-alist))))
-    (send-string timer-process (concat time "@" token "\n"))
-    (setq timer-alist (cons (list token repeat function args) timer-alist))))
-
-(defun timer-process-filter (proc str)
-  (setq timer-out (concat timer-out str))
-  (let (do token error)
-    (while (string-match "\n" timer-out)
-      (setq token (substring timer-out 0 (match-beginning 0))
-            do (assoc token timer-alist)
-            timer-out (substring timer-out (match-end 0)))
-      (cond
-       (do (apply (nth 2 do) (nth 3 do))   ; do it
-           (if (natnump (nth 1 do))        ; reschedule it
-               (send-string proc (concat (nth 1 do) " sec@" (car do) "\n"))
-             (setq timer-alist (delq do timer-alist))))
-       ((string-match "timer: \\([^:]+\\): \\([^@]*\\)@\\(.*\\)$" token)
-        (setq error (substring token (match-beginning 1) (match-end 1))
-              do    (substring token (match-beginning 2) (match-end 2))
-              token (assoc (substring token (match-beginning 3) (match-end 3))
-                           timer-alist)
-              timer-alist (delq token timer-alist))
-        (ding 'no-terminate) ; using error function in process filters is rude
-        (message "%s for %s; couldn't set at \"%s\"" error (nth 2 token) do))))
-    (or timer-alist timer-dont-exit (process-send-eof proc))))
-
-(defun timer-process-sentinel (proc str)
-  (let ((stat (process-status proc)))
-    (if (eq stat 'stop) (continue-process proc)
-      ;; if it exited normally, presumably it was intentional.
-      ;; if there were no pending events, who cares that it exited?
-      (if (or (not timer-alist) (eq stat 'exit)) ()
-        (ding 'no-terminate)
-        (message "Timer exited abnormally.  All events cancelled."))
-      ;; Used to set timer-scratch to "", but nothing uses that var.
-      (setq timer-process nil timer-alist nil))))
-
-(defun cancel-timer (function)
-  "Cancel all events scheduled by `run-at-time' which would run FUNCTION."
-  (interactive "aCancel function: ")
-  (let ((alist timer-alist))
-    (while alist
-      (if (eq (nth 2 (car alist)) function)
-          (setq timer-alist (delq (car alist) timer-alist)))
-      (setq alist (cdr alist))))
-  (or timer-alist timer-dont-exit (process-send-eof timer-process)))
-
-(provide 'timer)
-
-;;; timer.el ends here
+;;; 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