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;;; later-do.el --- execute lisp code ... later
;; Copyright (C) 2004, 2005, 2006, 2007, 2008 Free Software Foundation, Inc.
;; Author: Jorgen Schaefer <forcer@forcix.cx>
;;; This program 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 3
;;; of the License, or (at your option) any later version.
;;; This program 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 this program; if not, write to the Free Software
;;; Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
;;; 02110-1301 USA
;;; Commentary
;; This file will execute lisp code "later on". This way it is
;; possible to work while elisp does some longer calculations, if you
;; can convert those calculations into a sequence of function calls.
;;; Code:
(defvar later-do-version "0.2emms2 (2005-09-20)"
"Version string of later-do.")
(defgroup later-do nil
"*Running functions ... later!"
:prefix "later-do-"
:group 'development)
(defcustom later-do-interval 0.5
"How many seconds to wait between running events."
:group 'later-do
:type 'number)
(defvar later-do-list nil
"A list of functions to be called lateron.")
(defvar later-do-timer nil
"The timer that later-do uses.")
(defun later-do (function &rest args)
"Apply FUNCTION to ARGS later on. This is an unspecified amount of
time after this call, and definitely not while lisp is still
executing.
Code added using `later-do' is guaranteed to be executed in the
sequence it was added."
(setq later-do-list (nconc later-do-list
(list (cons function args))))
(unless later-do-timer
(setq later-do-timer
(run-with-timer later-do-interval nil 'later-do-timer))))
(defun later-do-timer ()
"Run the next element in `later-do-list', or do nothing if it's
empty."
(if (null later-do-list)
(setq later-do-timer nil)
(let ((fun (caar later-do-list))
(args (cdar later-do-list)))
(setq later-do-list (cdr later-do-list))
(unwind-protect
(apply fun args)
(setq later-do-timer (run-with-timer later-do-interval
nil
'later-do-timer))))))
(provide 'later-do)
;;; later-do.el ends here
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