Re: master 2ef6f943abd: Add option to control default outlining in 'C-h b'

[Michael Heerdegen <michael_heerdegen@web.de>]

Robert Pluim <rpluim@gmail.com> writes:

> Or we could have a 100% backwards compatible implementation like this,
> which Iʼd push to emacs-29 if it wasnʼt in pre-release :-)

> -- A cons cell of the form (custom-function . FUNCTION) where
>
> +- A cons cell of the form (predicate . FUNCTION) where
>    FUNCTION is a lambda function or function name which will be
> -  called without arguments with point at the beginning of the
> -  heading and the match data set appropriately, the function
> -  being expected to toggle the heading visibility."
> +  called without arguments, with point at the beginning of the
> +  heading, and the match data set appropriately.  If the function
> +  returns nil the subtree will be shown, otherwise it is hidden.

Good idea - I like it.


[ BTW, this "accordingly set match data" is from `outline-map-region',
i.e. `outline-search-function' or (if nil) from matching outline-regexp?
Should we add that information? ]


Thanks,

Michael.