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(Choosing Modes): Document magic-mode-alist.

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Richard M. Stallman 2005-04-11 16:39:49 +00:00
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man/major.texi
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@ -98,6 +98,21 @@ the element has the form @code{(@var{regexp} @var{mode-function}
@var{mode-function}, Emacs discards the suffix that matched
@var{regexp} and searches the list again for another match.
@vindex magic-mode-alist
Sometimes the major mode is determined from the way the file's text
begins. The variable @code{magic-mode-alist} controls this. Its value
is a list of elements of this form:
@example
(@var{regexp} . @var{mode-function})
@end example
@noindent
This looks like an element of @code{auto-mode-alist}, but it doesn't work
the same: this @var{regexp} is matched against the text at the start
of the buffer, not against the file name. @code{magic-mode-alist}
takes priority over @code{auto-mode-alist}.
You can specify the major mode to use for editing a certain file by
special text in the first nonblank line of the file. The
mode name should appear in this line both preceded and followed by