bug#60894: 30.0.50; [PATCH] Add treesit-forward-sexp

[Dmitry Gutov]

On 19/01/2023 04:43, Stefan Monnier via Bug reports for GNU Emacs, the 
Swiss army knife of text editors wrote:
> > > My SMIE experience with it is that we really need a specific hook
> > > for that if we want to avoid wonky behaviors in "corner" cases.
> > A bug report with repro would probably help, I guess. Or you could start on
> > that hook yourself.
>
> I think `C-M-u` from within a LaTeX environment was one of the cases
> where it misbehaved (tho that one is not using SMIE).

Any chance SMIE is doing something different, or something particularly 
correct?

Because in my experience as well backward-up-list seems to work fine 
with SMIE, but not with the tree-sitter forward-sexp implementation 
under discussion.

> > Do you mean a hook like backward-up-list-function, or something smaller?
>
> Something like that.  Maybe it could also be used for `expand-region`
> and `thing-at-point` kind of purposes maybe and could work even for
> treesit nodes that aren't "matching begin..end thingies".

A treesit node doesn't need an explicit "end" token, though.