Re: Make all tree-sitter modes optional

[Eli Zaretskii <eliz@gnu.org>]

> Date: Mon, 16 Jan 2023 15:06:15 +0200
> Cc: casouri@gmail.com, monnier@iro.umontreal.ca, larsi@gnus.org,
>  theo@thornhill.no, jostein@secure.kjonigsen.net, emacs-devel@gnu.org
> From: Dmitry Gutov <dgutov@yandex.ru>
> 
> >    . The proposed patch made many changes of auto-mode-alist
> >      conditional where they previously were _un_conditional.
> 
> It also added some where there were none.

Yes, so that we do this consistently.  Inconsistency would lead to
more confusion and difficulties in documentation.

> > I submit
> >      that this is less annoyance in the important use case where the
> >      tree-sitter or the grammar library is not available.  There are
> >      indications that this situation will be frequent enough when Emacs
> >      29.1 hits the street.
> 
> Like I said, either making them unconditional, or removing them, would 
> lead to better, more predictable behavior.

OK, so let's disagree about this.

> >    . I don't buy the assumption that customizations of auto-mode-alist
> >      are frequent enough to make that an important factor in these
> >      decisions, let alone suggest that users should always do that if
> >      they want to try the *-ts-* modes seriously:
> 
> Why wouldn't they be frequent? It's the only way for the user to have 
> file format supported, where we don't support it OOTB.

I was talking about modes included in Emacs.

> The customization of auto-mode-alist might also happen for the user 
> automatically. When the user installs a third-party package, such as 
> json-mode, from ELPA, that modified auto-mode-alist through package 
> autoloads.
> 
> Having it modified again by 'M-x yaml-ts-mode', but only for the 
> duration of the current session, would be surprising and odd. If I were 
> a new user, I would be questioning both why the mode association 
> changed, and why it didn't persist between sessions.

We disagree again.  I guess we will have to wait and see who is right.

> >        - IME, auto-mode-alist is relatively rarely customized for modes
> >          that are included in Emacs (e.g., I don't customize entries of
> >          any such modes), for the simple reason that it is very rarely
> >          needed.
> 
> I'm talking about modes which are not included in Emacs.

Not relevant to this discussion.