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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, Emacs 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 describes Emacs Lisp, presuming considerable familiarity
with the use of Emacs for editing. (See The GNU Emacs Manual for this
basic information.) Generally speaking, the earlier chapters describe
features of Emacs Lisp that have counterparts in many programming
languages, and later chapters describe features that are peculiar to
Emacs Lisp or relate specifically to editing.
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