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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 attempts to be a full description of Emacs Lisp. For a beginner's
introduction to Emacs Lisp, see "An Introduction to Emacs Lisp Programming," by
Bob Chassell, also published by the Free Software Foundation. This manual
presumes 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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