Annotated edit history of
Elisp version 9, including all changes.
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AristotlePagaltzis |
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The [LISP]-based scripting language used to customise the [Emacs] programmers' editor. |
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GlynWebster |
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Emacs is completely scriptable in Elisp - look in /usr/share/emacs/site-lisp/*.el for the start-up and config files. |
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''[Programming in Emacs Lisp | http://www.delorie.com/gnu/docs/emacs-lisp-intro/emacs-lisp-intro.html]'' is an online book about Emacs scripting by Robert J. Chassell. It does not assume you already know Lisp. |
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!!! Note for Lisp programmers |
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ELisp is __dynamically scoped__. This affects how global variables in function definitions are looked up. With dynamic scoping the interpreter looks up these variables in the environment where the function is ''called''. What other [LISP] do is to use the variable definitions that were present when the function was ''defined'' (i.e. ''lexical scoping''). This difference will only effect you if you are trying to do lots of [higher-order functional programming | HigherOrderFunctions] in ELisp, but if you do, it will trip you up. |
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!!!Example |
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This sets up the F12 key to instantly save and close a file that Emacs is editing: |
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(defun begins-with-p (str sub) |
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"True if string `str' begins with substring `sub'." |
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(and (>= (length str) (length sub)) |
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(string= (substring str 0 (length sub)) sub))) |
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(defun put-away-buffer (&optional buffer) |
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"This kills a buffer, saving its contents first, if necessary. |
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Internal and *scratch* buffers are ignored." |
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(interactive) |
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(unless buffer |
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(setq buffer (current-buffer))) |
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(unless (or (begins-with-p (buffer-name buffer) " ") ;ignore internal buffers |
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(string= "*scratch*" (buffer-name buffer))) ;ignore scratch buffer |
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(when (and (buffer-file-name buffer) ;is visiting a file |
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(buffer-modified-p buffer)) |
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(save-buffer)) |
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(kill-this-buffer))) |
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GlynWebster |
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(global-set-key [[f12] #'put-away-buffer) |
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GlynWebster |
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---- |
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AristotlePagaltzis |
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CategoryProgrammingLanguages, CategoryFunctionalProgrammingLanguages |
