From b3953ee0ff4c2bdb5c91a53b45c501896d529d8f Mon Sep 17 00:00:00 2001
From: "Richard M. Stallman" <rms@gnu.org>
Date: Wed, 31 Jan 1996 20:12:19 +0000
Subject: Initial revision

---
 lisp/timer.el | 334 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 334 insertions(+)
 create mode 100644 lisp/timer.el

(limited to 'lisp')

diff --git a/lisp/timer.el b/lisp/timer.el
new file mode 100644
index 00000000000..e29ee58a211
--- /dev/null
+++ b/lisp/timer.el
@@ -0,0 +1,334 @@
+;;; 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 delta-secs function args]
+
+(defun timer-create ()
+  "Create a timer object."
+  (let ((timer (make-vector 7 nil)))
+    (aset timer 0 t)
+    timer))
+
+(defun timerp (object)
+  "Return t if OBJECT is a timer."
+  (and (vectorp object) (= (length object) 7)))
+
+(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 meny 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 (if (consp (cdr time)) (nth 2 time) 0))
+  (aset timer 4 (and (numberp delta) (> delta 0) delta))
+  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 (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 menu 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)
+	nil)
+    (error "Invalid or uninitialized timer")))
+
+(defalias 'disable-timeout 'cancel-timer)
+(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))
+  nil)
+
+(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)))))
+
+;; Set up the common handler for all timer events.  Since the event has
+;; the timer as parameter we can still distinguish.  Note that using
+;; special-event-map ensures that event timer events that arrive in the
+;; middle of a key sequence being entered are still handled correctly.
+(define-key special-event-map [timer-event] 'timer-event-handler)
+(defun timer-event-handler (event)
+  "Call the handler for the timer in the event EVENT."
+  (interactive "e")
+  (let ((timer (car-safe (cdr-safe event))))
+    (if (timerp timer)
+	(progn
+	  ;; Delete from queue.
+	  (cancel-timer timer)
+	  ;; Run handler
+	  (apply (aref timer 5) (aref timer 6))
+	  ;; Re-schedule if requested.
+	  (if (aref timer 4)
+	      (progn
+		(timer-inc-time timer (aref timer 4) 0)
+		(timer-activate timer))))
+      (error "Bogus timer event"))))
+
+;;;###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 is a string like \"11:23pm\" or a value from `encode-time'.
+REPEAT, an integer number of seconds, is the interval on which to repeat
+the call to the function.  If REPEAT is nil or 0, call it just once.
+
+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 repeting.
+  (if (null time)
+      (setq time (current-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.
+  (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)
+      (natnump 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: ")
+
+  (or (null repeat)
+      (and (numberp repeat) (>= repeat 0))
+      (error "Invalid repetition interval"))
+
+  (let ((timer (timer-create)))
+    (timer-set-time timer (current-time))
+    (timer-inc-time timer secs)
+    (timer-set-function timer function args)
+    (timer-activate timer)
+    timer))
+
+;;;###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))
+
+(defun timeout-event-p (event)
+  "Non-nil if EVENT is a timeout event."
+  (and (listp event)
+       (eq (car event) 'timer-event)))
+
+(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 looks 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)))))
+    secs))
+
+(provide 'timer)
+
+;;; timer.el ends here
-- 
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