Re: treesit-forward-sexp (was: Make all tree-sitter modes optional)

[Dmitry Gutov]

On 17/01/2023 19:34, Juri Linkov wrote:
> > I'm using ruby-mode, at least for now, while all the wrinkles with
> > indentation haven't been ironed out (and we'll probably not manage to get
> > them all 100% right before the 29 release), and while ts modes don't
> > support show-paren-mode like SMIE does. No proper sexp navigation, etc.
> BTW, how ruby-ts-mode is intended to be used without proper sexp navigation?
>
> I see that forward-sentence support for tree sitter was added recently
> with treesit-forward-sentence.  There are also treesit-transpose-sexps,
> treesit-beginning-of-defun and treesit-end-of-defun.
>
> Are there any plans to add treesit-forward-sexp as well?
>
> Currently I'm using such workaround:
>
> ```
> (with-eval-after-load 'ruby-ts-mode
>    (add-hook 'ruby-ts-mode-hook
>              (lambda ()
>                (smie-setup ruby-smie-grammar #'ruby-smie-rules
>                            :forward-token  #'ruby-smie--forward-token
>                            :backward-token #'ruby-smie--backward-token))))
> ```
I have also been toying with the idea of using SMIE for indentation with 
ruby-ts-mode, keeping tree-sitter for font-lock and other facilities 
which are easier to support.
But for now I'm working on improving tree-sitter based indentation. 
After all, the underlying data it's using is by definition more correct.
> Maybe something like this should be added to emacs-29
> until treesit-forward-sexp is implemented in master?
I don't know if everybody will agree with that. ruby-ts-mode's author in 
particular.
So it's probably better suited for personal customizations, like yours 
above. BTW note that smie-setup also sets indent-line-function.