home *** CD-ROM | disk | FTP | other *** search
- ;;; 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-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")))
-
- (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))
- (setq timer-idle-list (delq timer timer-idle-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))))
- (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)))))
-
- ;; 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)
-
- ;; Record the last few events, for debugging.
- (defvar timer-event-last-2 nil)
- (defvar timer-event-last-1 nil)
- (defvar timer-event-last nil)
-
- (defun timer-event-handler (event)
- "Call the handler for the timer in the event EVENT."
- (interactive "e")
- (setq timer-event-last-2 timer-event-last-1)
- (setq timer-event-last-1 timer-event-last)
- (setq timer-event-last (cons event (copy-sequence event)))
- (let ((inhibit-quit t)
- (timer (car-safe (cdr-safe event))))
- (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)
- (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 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 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
-