emms package

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diff --git a/elisp/emms-later-do.el b/elisp/emms-later-do.el
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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 <[email protected]>
+
+;; 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