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;;; emms-later-do.el --- Execute Lisp code ... later -*- lexical-binding: t; -*-
;; Copyright (C) 2004-2021 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.
;; 2020-09-22: Name changed from later-do to emms-later-do in order to
;; avoid polluting the namespace.
;;; Code:
(defvar emms-later-do-version "0.2emms4 (2018-04-07)"
"Version string of emms-later-do.")
(defgroup emms-later-do nil
"*Running functions ... later!"
:prefix "emms-later-do-"
:group 'development)
(defcustom emms-later-do-interval 0.5
"How many seconds to wait between running events."
:type 'number)
(defcustom emms-later-do-batch 20
"How many functions to process before waiting `emms-later-do-interval'.
The functions are processed from `emms-later-do-list'. Must be 1 or
greater. Too high a value might make Emacs slower while the
list is being processed."
:type 'number)
(defvar emms-later-do-list nil
"A list of functions to be called later on.")
(defvar emms-later-do-timer nil
"The timer that emms-later-do uses.")
(defun emms-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 `emms-later-do' is guaranteed to be
executed in the sequence it was added."
(setq emms-later-do-list (nconc emms-later-do-list
(list (cons function args))))
(unless emms-later-do-timer
(setq emms-later-do-timer
(run-with-timer emms-later-do-interval nil 'emms-later-do-timer))))
(defun emms-later-do-timer ()
"Run the next element in `emms-later-do-list', or do nothing if it's
empty."
(if (null emms-later-do-list)
(setq emms-later-do-timer nil)
(let (res)
(unwind-protect
(dotimes (_b (min emms-later-do-batch (length emms-later-do-list)) res)
(let ((fun (caar emms-later-do-list))
(args (cdar emms-later-do-list)))
(setq emms-later-do-list (cdr emms-later-do-list))
(setq res (apply fun args)))))
(setq emms-later-do-timer (run-with-timer emms-later-do-interval
nil
'emms-later-do-timer)))))
(provide 'emms-later-do)
;;; emms-later-do.el ends here
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