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Improve the documentation of 'auto-mode-alist' search

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* doc/emacs/modes.texi (Choosing Modes): Expand the description of
"recursive extension stripping" using 'auto-mode-alist'.
(Bug#60930)
This commit is contained in:
Eli Zaretskii 2023-01-18 16:01:12 +02:00
parent 1798ff5a66
commit bd5ef3ef95
1 changed files with 9 additions and 4 deletions
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doc/emacs/modes.texi
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@ -430,10 +430,15 @@ For example, one element normally found in the list has the form
mode for files whose names end in @file{.c}. (Note that @samp{\\} is mode for files whose names end in @file{.c}. (Note that @samp{\\} is
needed in Lisp syntax to include a @samp{\} in the string, which must needed in Lisp syntax to include a @samp{\} in the string, which must
be used to suppress the special meaning of @samp{.} in regexps.) If be used to suppress the special meaning of @samp{.} in regexps.) If
the element has the form @code{(@var{regexp} @var{mode-function} the element has the form @w{@code{(@var{regexp} @var{mode-function}
@var{flag})} and @var{flag} is non-@code{nil}, then after calling @var{flag})}} and @var{flag} is non-@code{nil}, then after calling
@var{mode-function}, Emacs discards the suffix that matched @var{mode-function} (if it is non-@code{nil}), Emacs discards the
@var{regexp} and searches the list again for another match. suffix that matched @var{regexp} and searches the list again for
another match. This ``recursive extension stripping'' is used for
files which have multiple extensions, and the ``outer'' extension
hides the ``inner'' one that actually specifies the right mode. For
example, backup files and GPG-encrypted files with @file{.gpg}
extension use this feature.
@vindex auto-mode-case-fold @vindex auto-mode-case-fold
On GNU/Linux and other systems with case-sensitive file names, Emacs On GNU/Linux and other systems with case-sensitive file names, Emacs