Emacs uses keymaps to record which keys call which commands. Specific modes, such as C mode or Text mode, have their own keymaps; the mode-specific keymaps override the global map that is shared by all buffers.
global-set-key function binds, or rebinds, the global
keymap. For example, the following binds the key C-c C-l to the
(global-set-key "\C-c\C-l" 'line-to-top-of-window))
Mode-specific keymaps are bound using the
which takes a specific keymap as an argument, as well as the key and
the command. For example, my `.emacs' file contains the
following expression to bind the
to C-c C-c g:
(define-key texinfo-mode-map "\C-c\C-cg" 'texinfo-insert-@group)
texinfo-insert-@group function itself is a little extension
to Texinfo mode that inserts `@group' into a Texinfo file. I
use this command all the time and prefer to type the three strokes
C-c C-c g rather than the six strokes @ g r o u p.
(`@group' and its matching `@end group' are commands that
keep all enclosed text together on one page; many multi-line examples
in this book are surrounded by `@group ... @end group'.)
Here is the
texinfo-insert-@group function definition:
(defun texinfo-insert-@group () "Insert the string @group in a Texinfo buffer." (interactive) (beginning-of-line) (insert "@group\n"))
(Of course, I could have used Abbrev mode to save typing, rather than write a function to insert a word; but I prefer key strokes consistent with other Texinfo mode key bindings.)
You will see numerous
define-key expressions in
`loaddefs.el' as well as in the various mode libraries, such as
`c-mode.el' and `lisp-mode.el'.
See section `Customizing Key Bindings' in The GNU Emacs Manual, and section `Keymaps' in The GNU Emacs Lisp Reference Manual, for more information about keymaps.
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