mirror of
https://git.savannah.gnu.org/git/emacs.git
synced 2024-12-14 09:39:42 +00:00
145 lines
6.0 KiB
EmacsLisp
145 lines
6.0 KiB
EmacsLisp
;;; 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.
|
|
|
|
;;; Commentary:
|
|
|
|
;; This package gives you the capability to run Emacs Lisp commands at
|
|
;; specified simes in the future, either as one-shots or periodically.
|
|
;; The single entry point is `run-at-time'.
|
|
|
|
;;; Code:
|
|
|
|
;;; The name of the program to run as the timer subprocess. It should
|
|
;;; be in exec-directory.
|
|
(defconst timer-program "timer")
|
|
|
|
(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.
|
|
TIME can also be an integer, a number of seconds.
|
|
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.
|
|
|
|
Absolute times may be specified in a wide variety of formats;
|
|
Something of the form `HOUR:MIN:SEC TIMEZONE MONTH/DAY/YEAR', where
|
|
all fields are numbers, works; the format used by the Unix `date'
|
|
command works too.
|
|
|
|
Relative times may be specified as a series of numbers followed by units:
|
|
1 min denotes one minute from now.
|
|
min does too.
|
|
1 min 5 sec denotes 65 seconds from now.
|
|
1 min 2 sec 3 hour 4 day 5 week 6 fortnight 7 month 8 year
|
|
denotes the sum of all the given durations from now."
|
|
(interactive "sRun at time: \nNRepeat interval: \naFunction: ")
|
|
;; Make TIME a string.
|
|
(if (integerp time)
|
|
(setq time (format "%d sec" time)))
|
|
(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))
|
|
;; Don't search the exec path for the timer program;
|
|
;; we know exactly which one we want.
|
|
(start-process "timer" nil
|
|
(expand-file-name timer-program
|
|
exec-directory)))
|
|
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)))
|
|
(elt (list token repeat function args)))
|
|
(process-send-string timer-process (concat time "@" token "\n"))
|
|
(setq timer-alist (cons elt timer-alist))
|
|
elt))
|
|
|
|
(defun cancel-timer (elt)
|
|
"Cancel a timer previously made with `run-at-time'.
|
|
The argument should be a value previously returned by `run-at-time'.
|
|
Cancelling the timer means that nothing special
|
|
will happen at the specified time."
|
|
(setcar (cdr elt) nil)
|
|
(setcar (cdr (cdr elt)) 'ignore))
|
|
|
|
(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-function-timers (function)
|
|
"Cancel all events scheduled by `run-at-time' which would run FUNCTION."
|
|
(interactive "aCancel timers of 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
|