Re: Tree-sitter and major mode inheritance

[Dmitry Gutov]

On 20.11.2022 16:49, Eli Zaretskii wrote:
> > Date: Sun, 20 Nov 2022 15:22:40 +0200
> > Cc: casouri@gmail.com, emacs-devel@gnu.org, monnier@iro.umontreal.ca,
> >   theo@thornhill.no
> > From: Dmitry Gutov <dgutov@yandex.ru>
> >
> > > This is a
> > > fragile assumption, so code which is based on it is broken and should be
> > > fixed.
> >
> > Okay then, but then we'll need to learn another way to ask that
> > question.
>
> I guess.  I admit I didn't know derived-mode-p was being used for such
> tests.
>
> Would it make sense to use alternatives, as in
>
>    (or (derived-mode-p 'js-mode)
>        (derived-mode-p 'js-ts-mode))
>
> ?

Those kind of lists are going to be inherently non-exhaustive.

> Or maybe we should add a new predicate, which will take a LANGUAGE argument,
> and use some database of known modes internally to call derived-mode-p as
> above?

Some kind of new registry could be the answer, but it would be nice to 
manage using the existing tools/variables somehow.

Stefan has touched on this issue in https://debbugs.gnu.org/58075