bug#60559: 29.0.60; "Cannot activate tree-sitter" spam

[Stephen Berman <stephen.berman@gmx.net>]

On Wed, 04 Jan 2023 20:36:15 +0200 Eli Zaretskii <eliz@gnu.org> wrote:

> tags 60559 notabug wontfix
> thanks
>
>> From: Eric Gillespie <epg@pretzelnet.org>
>> Date: Wed, 04 Jan 2023 08:48:43 -0600
>>
>> 1. emacs -Q Cargo.toml
>> 2. emacs -Q Dockerfile
>>
>> Expected results:
>> Files opened without fanfare, as emacs always faithfully did for me
>> these last 25 years.
>>
>> Actual results:
>> In both cases, a *Warnings* buffer pops up noisily occupying half the
>> screen and showing a bright red emoji saying:
>>
>> 	Warning (treesit): Cannot activate tree-sitter, because
>> 	tree-sitter library is not compiled with Emacs
>
> This is not a bug.  Emacs 29 comes with major modes for TOML files and
> for Dockerfiles, and those new major modes require that you build
> Emacs with the tree-sitter library (and install the corresponding
> parser grammar libraries).  If you don't want to do that, you can
> instead customize auto-mode-alist to make Emacs use Fundamental mode
> (or any other mode you like) for these two file types.

Emacs 28 already has conf-toml-mode for TOML files, so shouldn't
toml-ts-mode be handled like e.g. c-ts-mode instead of being added to
auto-mode-alist? (The default value of that variable in Emacs 29 still
contains an entry for conf-toml-mode, lower down than the entry for
toml-ts-mode.)

Steve Berman