> On Aug 26, 2023, at 1:04 PM, Eli Zaretskii <eliz@gnu.org> wrote:
>> I guess I’m looking for something like `(treesit-preferred LANG)’ or `(default-major-mode LANG)’.
> 
> There's no such thing, and probably won't be, at least not soon enough
> for you to rely on it.  We are still learning how to deal with this
> new situation.

Got it, thanks.  There has always been some ambiguity when there are several modes competing, but usually there is a “dominant strain” consumer modes can adopt as the default.

> As for your suggestions: treesit-preferred is problematic, because no
> one says the user will always prefer ts modes for all of the
> languages, nor do we want to force them.  As for default-major-mode, I
> don't understand how could we implement that, except by deferring to
> user options again.


This would be a top-level user option, but it would be “one stop shopping” for the user.  I.e. they would not need to configure this and `major-mode-remap-alist’.

One (likely too) simple idea: a function to ask emacs “What mode would you enable if I opened /path/to/file.EXT”, without actually having to open it.  Consumer modes could check that for relevant paths and extensions, and opt to use that mode (if everything else checks out).

>  . if a ts mode is already loaded (featurep test)

The consumer-mode may be the first to use it.

>  . if auto-mode-alist defines a ts mode for the relevant files

I mentioned that in my #5. I suppose that’s a cousin of my (too) simple idea above, except for dir-locals etc.