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However, Emacs Lisp provides many features for navigating and modifying buffer text at a sentence, paragraph, or higher syntactic level as defined by modes. For example, Emacs Lisp cannot easily read a file a line at a time-the entire file must be read into an Emacs buffer. To understand the logic behind Emacs Lisp, it is important to remember that there is an emphasis on providing data structures and features specific to making a versatile text editor over implementing a general-purpose programming language.
AQUAMACS RACKET UPDATE
Recently, there has been an ongoing effort to update code to use lexical scoping, for reasons outlined below. That is, a function may reference local variables in the scope it is called from, but not in the scope where it was defined. A prominent characteristic of Emacs Lisp is in its use of dynamic rather than lexical scope by default. The Lisp dialect used in Emacs differs substantially from the more modern Common Lisp and Scheme dialects used for applications programming. He chose not to use it because of its comparatively poor performance on workstations (as opposed to the minicomputers that were Emacs' traditional home), and he wanted to develop a dialect which he thought would be more easily optimized. Although the Common Lisp standard had yet to be formulated, Scheme existed at the time Stallman was rewriting Gosling Emacs into GNU Emacs. Richard Stallman chose Lisp as the extension language for his rewrite of Emacs (the original used Text Editor and Corrector (TECO) as its extension language) because of its powerful features, including the ability to treat functions as data. It supports imperative and functional programming methods. No user interface is presented when Emacs is started in batch mode it simply executes the passed-in script and exits, displaying any output from the script.Įmacs Lisp is most closely related to Maclisp, with some later influence from Common Lisp. In this way it may be called from the command line or via an executable file, and its editing functions, such as buffers and movement commands are available to the program just as in the normal mode. When the user saves their changes, Customize simply writes the necessary Emacs Lisp code to the user's config file, which can be set to a special file that only Customize uses, to avoid the possibility of altering the user's own file.Įmacs Lisp can also function as a scripting language, much like the Unix Bourne shell or Perl, by calling Emacs in batch mode. Itself written in Emacs Lisp, Customize provides a set of preferences pages allowing the user to set options and preview their effect in the running Emacs session. Other options include the Customize feature that's been in GNU Emacs since version 20. Users of Emacs commonly write Emacs Lisp code to customize and extend Emacs.
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Emacs Lisp is also termed Elisp, although there is also an older, unrelated Lisp dialect with that name. It is used for implementing most of the editing functionality built into Emacs, the remainder being written in C, as is the Lisp interpreter. I am not too familiar with Eclipse, but I doubt that it is simpler than Emacs.Emacs Lisp is a dialect of the Lisp programming language used as a scripting language by Emacs (a text editor family most commonly associated with GNU Emacs and XEmacs). but you can choose what to add, Emacs is infinitely malleable and does not care what you do to it. As you add packages, you add functionality and complexity. Emacs with simple.el (and friends) is still a very simple, but rich, text editor. Plain emacs is a very simple toolkit for building your own editor. But you can just pretend it doesn't exist nobody is forcing you to use anything. Sure, you can argue that many emacs extensions (hello, Gnus) are bloat. (Yes, some gets compiled right into the Emacs binary to speed startup, but you can skip that.) That's about it the rest is all Emacs Lisp code that you can simply choose not to run. On top of that are some primitive functions ("and", "cdr", etc.), along with some primitive editing functions ("next-line") implemented in C. Then there is the Lisp VM and associated data structures ("Lisp_Object") to glue everything together. There is support for managing buffers, and other very primitive editor functionality like that. There is code to support each platform and windowing system emacs runs on. Do you know anything about emacs? There is actually not that much bloat.