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Merge branch 'derived-mode-add-parents'

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Stefan Monnier 2023-11-16 09:57:38 -05:00
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doc/lispref/modes.texi
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@ -937,6 +937,31 @@ This function returns non-@code{nil} if the current major mode is
derived from any of the major modes given by the symbols @var{modes}.
@end defun
The graph of major modes is accessed with the following lower-level
functions:
@defun derived-mode-set-parent mode parent
This function declares that @var{mode} inherits from @code{parent}.
This is the function that @code{define-derived-mode} calls after
defining @var{mode} to register the fact that @var{mode} was defined
by reusing @code{parent}.
@end defun
@defun derived-mode-add-parents mode extra-parents
This function makes it possible to register additional parents beside
the one that was used when defining @var{mode}. This can be used when
the similarity between @var{mode} and the modes in @var{extra-parents}
is such that it makes sense to treat it as a child of those
modes for purposes like applying directory-local variables.
@end defun
@defun derived-mode-all-parents mode
This function returns the list of all the modes in the ancestry of
@var{mode}, ordered from the most specific to the least specific, and
starting with @var{mode} itself.
@end defun
@node Basic Major Modes
@subsection Basic Major Modes