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Explain how to unset mode bindings (Bug#39802)

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* doc/emacs/custom.texi (Init Rebinding): Explain that passing nil to
define-key will unbind keys, and extend the example accordingly.
This commit is contained in:
Noam Postavsky 2020-02-27 08:09:44 -05:00
parent 7cafbbe964
commit 60418a1ab2
1 changed files with 11 additions and 6 deletions
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doc/emacs/custom.texi
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@ -1873,15 +1873,19 @@ You can use a vector for the simple cases too:
Language and coding systems may cause problems with key bindings for
non-@acronym{ASCII} characters. @xref{Init Non-ASCII}.
@findex define-key
As described in @ref{Local Keymaps}, major modes and minor modes can
define local keymaps. These keymaps are constructed when the mode is
used for the first time in a session. If you wish to change one of
these keymaps, you must use the @dfn{mode hook} (@pxref{Hooks}).
loaded for the first time in a session. The function @code{define-key}
can be used to make changes in a specific keymap. This function can
also unset keys, when passed @code{nil} as the binding.
@findex define-key
For example, Texinfo mode runs the hook @code{texinfo-mode-hook}.
Here's how you can use the hook to add local bindings for @kbd{C-c n}
and @kbd{C-c p} in Texinfo mode:
Since a mode's keymaps are not constructed until it has been loaded,
you must delay running code which modifies them, e.g., by putting it
on a @dfn{mode hook} (@pxref{(Hooks)}). For example, Texinfo mode
runs the hook @code{texinfo-mode-hook}. Here's how you can use the
hook to add local bindings for @kbd{C-c n} and @kbd{C-c p}, and remove
the one for @kbd{C-c C-x x} in Texinfo mode:
@example
(add-hook 'texinfo-mode-hook
@ -1890,6 +1894,7 @@ and @kbd{C-c p} in Texinfo mode:
'backward-paragraph)
(define-key texinfo-mode-map "\C-cn"
'forward-paragraph)))
(define-key texinfo-mode-map "\C-c\C-xx" nil)
@end example
@node Modifier Keys