GNU Emacs is an extensible, customizable text editor—and more. At its core is an interpreter for Emacs Lisp, a dialect of the Lisp programming language with extensions to support text editing. The features of GNU Emacs include:
Content-sensitive editing modes, including syntax coloring, for a variety of file types including plain text, source code, and HTML. Complete built-in documentation, including a tutorial for new users. Full Unicode support for nearly all human languages and their scripts. Highly customizable, using Emacs Lisp code or a graphical interface. A large number of extensions that add other functionality, including a project planner, mail and news reader, debugger interface, calendar, and more. Many of these extensions are distributed with GNU Emacs; others are available separately.
Emacs 23 has a wide variety of new features, including:
- Improved Unicode support.
- Font rendering with Fontconfig and Xft.
- Support for using X displays and text terminals in one session, and for running as a daemon.
- Support for multi-file commits in distributed version-control systems (VC-dir).
- New modes and packages for viewing PDF and postscript files (Doc-view mode), connecting to processes through D-Bus (dbus), connecting to the GNU Privacy Guard (EasyPG), editing XML documents (nXML mode), editing Ruby programs (Ruby mode), and more.
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