Re: Tree-sitter integration on feature/tree-sitter

[Theodor Thornhill]

>
> Yes, thanks.
>
> However, I hoped that the font-lock and indentation are already
> integrated with tree-sitter, and all that is needed for a given
> major-mode to use it is to flip some variable.  I didn't expect to
> need a completely separate major mode for C sources, for example.

Isn't that the case, though?  You need to define the patterns to use,
but apart from that, there's not much to it.  I don't believe
tree-sitter itself is opinionated on how saturated the font-locking
should be.  As for definining completely separate major modes, I
personally think that's some of the point.  All of CC Mode functionality
can be replaced by the equivalent tree-sitter one.  Whether or not that
should be its own mode or behind some defcustom is up for discussion.

>
> It sounds like we are farther from the goal that I thought we were,
> and some serious work is still ahead of us to get this integrated into
> the existing major modes.

There's some manual labor involved in supporting a language.  Look at
how neovim does it for an alternative:
https://github.com/nvim-treesitter/nvim-treesitter

This is a collection of queries and highlights, as well as some
functionality to download the proper definitions.

Theodor