--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/lisp/prim/timer.el	Mon Aug 13 09:19:45 2007 +0200
@@ -0,0 +1,308 @@
+;;; 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:
+
+(require 'itimer)
+
+(fset 'timer-create 'make-itimer)
+
+(fset 'timerp 'itimerp)
+
+;(defvar timer-idle-list nil
+;  "List of active idle-time timers in order of increasing time")
+(defvaralias 'timer-idle-list 'itimer-list)
+(defvaralias 'timer-list 'itimer-list)
+
+
+(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."
+  (set-itimer-value timer (itimer-time-difference time (current-time)))
+  (and delta (check-nonnegative-number delta))
+  (and delta (set-itimer-restart timer 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."
+  (set-itimer-is-idle timer t)
+  (set-itimer-value timer secs)
+  (when repeat
+    (set-itimer-restart timer secs))
+  timer)
+
+(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 (itimer-value timer)))
+    (setq time (+ time secs (if (and usecs (fboundp 'lisp-float-type))
+				(/ usecs (float 1000000))
+			      0)))
+    (set-itimer-value timer time)))
+
+(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."
+  (let ((list (list nil nil nil)))
+    (setcar list (car time))
+    (setcar (nthcdr 1 list) (if (consp (cdr time))
+				(car (cdr time))
+			      (cdr time)))
+    (setcar (nthcdr 2 list) usecs)
+    (set-itimer-value timer (itimer-time-difference list (current-time)))
+    (set-itimer-restart timer delta)
+    timer))
+
+(defun timer-set-function (timer function &optional args)
+  "Make TIMER call FUNCTION with optional ARGS when triggering."
+  (set-itimer-function timer function)
+  (set-itimer-function-arguments timer args)
+  (set-itimer-uses-arguments timer t)
+  timer)
+
+(defun timer-activate (timer)
+  "Put TIMER on the list of active timers."
+  (activate-itimer timer))
+
+(defun timer-activate-when-idle (timer)
+  "Arrange to activate TIMER whenever Emacs is next idle."
+  (set-itimer-is-idle timer t)
+  (set-itimer-uses-arguments timer nil)
+  ;(unless (memq timer timer-idle-list)
+    ;(setq timer-idle-list (cons timer timer-idle-list)))
+  (activate-itimer timer))
+
+;; can't do this, different kind of timer
+;;(defalias 'disable-timeout 'cancel-timer)
+
+(defun cancel-timer (timer)
+  "Remove TIMER from the list of active timers."
+  ;(setq timer-idle-list (delq timer timer-idle-list))
+  (delete-itimer timer))
+
+(defun cancel-function-timers (function)
+  "Cancel all timers scheduled by `run-at-time' which would run FUNCTION."
+  (interactive "aCancel timers of function: ")
+  (let ((p itimer-list))
+    (while p
+      (if (eq function (itimer-function p))
+	  (progn
+	    (setq p (cdr p))
+	    (delete-itimer (car p)))
+	(setq p (cdr p))))))
+
+;;;###autoload
+(defun run-at-time (time repeat function &rest args)
+  "Perform an action after a delay of SECS seconds.
+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, or a value from `encode-time'.
+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: ")
+
+  ;; Special case: nil means "now" and is useful when repeating.
+  (if (null time)
+      (setq time (current-time)))
+
+  ;; 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"))
+
+  (or (null repeat)
+      (numberp repeat)
+      (error "Invalid repetition interval"))
+
+  (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 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