GNU Emacs Lisp Reference Manual Author:Bil Lewis, Dan LaLiberte, Richard Stallman This manual is a printed edition of the official GNU Emacs Lisp Reference Manual from the Emacs Version 24.5 distribution. Design is 100% Open Source (GPL v3). Most of the GNU Emacs text editor is written in the programming language called Emacs Lisp. You can write new code in Emacs Lisp and install it as an extension to the editor. However, Em... more »acs Lisp is more than a mere "extension language"; it is a full computer programming language in its own right. You can use it as you would any other programming language. Because Emacs Lisp is designed for use in an editor, it has special features for scanning and parsing text as well as features for handling files, buffers, displays, subprocesses, and so on. Emacs Lisp is closely integrated with the editing facilities; thus, editing commands are functions that can also conveniently be called from Lisp programs, and parameters for customization are ordinary Lisp variables. This manual attempts to be a full description of Emacs Lisp. This manual presumes considerable familiarity with the use of Emacs for editing; see The GNU Emacs Manual for this basic information. Emacs is free software and can be used on all major operating systems. For each copy of this manual sold, 10% of its gross sale revenue will be donated to the Free Software Foundation by the Publisher.« less