Re: Setting up user defined texinfo headlines using outline-heading-alist

[Jean Louis <bugs@gnu.support>]

Hello Yuri,

Thank you for insightful explanation. 

* Yuri Khan <yuri.v.khan@gmail.com> [2021-05-13 19:12]:
>     outline-regexp is a variable defined in ‘outline.el’.
>     Its value is (regexp-op "[*^L]+"

Here, not quite sure, but how I see the above regular expression
it will fold on the new line where there is character ^L, is it?

> So let’s change your hook function to set that:
> 
>     (defun instate-texinfo-hdlevels ()
>       (setq-local outline-heading-alist texinfo-hdlevels)
>       (setq-local outline-regexp
>                   (concat (regexp-opt (mapcar 'car texinfo-hdlevels)) "\\>")))

Interesting, I did not know the `regexp-opt' function, that is
very handy. It finds the regular expression that will match the
given list of strings and I find your application smart.

(regexp-opt '("something" "anything")) ⇒ "\\(?:\\(?:any\\|some\\)thing\\)"

(regexp-opt '("TODO" "DONE" "DELEGATED")) ⇒ "\\(?:D\\(?:ELEGATED\\|ONE\\)\\|TODO\\)"

and that may be reused with certainty to work:

(highlight-regexp "\\(?:D\\(?:ELEGATED\\|ONE\\)\\|TODO\\)")


-- 
Jean

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