Re: Make all tree-sitter modes optional

[Theodor Thornhill]

Eli Zaretskii <eliz@gnu.org> writes:

>> Date: Thu, 16 Feb 2023 08:53:56 +0100
>> From: Theodor Thornhill <theo@thornhill.no>
>> CC: monnier@iro.umontreal.ca, acm@muc.de, juri@linkov.net, casouri@gmail.com,
>>  larsi@gnus.org, jostein@secure.kjonigsen.net, emacs-devel@gnu.org
>> 
>> I'm thinking some devise like a "language layer", where major and minor 
>> modes are pluggable.
>> 
>> Let's say you want to program in JavaScript.
>> 
>> Then you can for example do something like:
>> 
>> (make-language-layer 'js-layer
>>   :major-mode 'js-ts-mode
>>   :lsp 'eglot
>>   :dagnostics 'flymake)
>> 
>> 
>> Then
>> 
>> (add-to-list auto-mode-alist ".js" 'js-layer)
>> 
>> And so forth. In this case a person can swap out flymake for flycheck, eglot 
>> for lsp-mode, js-ts-mode for js-mode etc. Then no implementation "owns" the 
>> language namespace, and we hopefully don't step on anyone's toes.
>> 
>> What do you think?
>
> I don't know yet.  We should definitely think about this more.  Emacs
> never had more than a single major mode per programming language, so
> for us "language" and "major mode" were always synonyms.  (Perl mode
> and CPerl mode is the only exception I know of, and it did cause us
> grief.)
>
> So yes, this is a new situation that could call for some new concepts
> in Emacs.

Yes, absolutely.  I just wanted to put out there a concrete thought that
hopefully moves the discussion forward.

Theo