You can use it to play tetris, browse the web, and compose email. Some people joke that Emacs is a good operating system. This has caused Emacs to become an editor with a kitchen sink, and everything else. Understanding Lisp can be handy if you ever want to add a feature to Emacs.īecause Emacs is so extensible, many people have written extensions to it. If you ever edit a file with a whole lot of parenthesis, the syntax you are witnessing is probably Lisp. Lisp is a functional language commonly used in artificial intelligence programming, but which is also used to customize Emacs. By the time it was implemented on Unix, it was written in C and used Lisp as an extension language to add new features and macros. His package of macros changed TECO's look and feel sufficiently that it was considered a separate editor and became known as EMACS, meaning Editor MACroS. In 1976, while working at the Artificial Intelligence Laboratory at MIT, Richard Stallman compiled a set of macro extensions to make the TECO editor (more of a text manipulation program than an editor) somewhat user friendly.
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