bug#58711: Treesit hangs when calling treesit-search-forward

[Yuan Fu <casouri@gmail.com>]

> On Nov 13, 2022, at 10:32 PM, Wilhelm Kirschbaum <wilhelm@floatpays.co.za> wrote:
> 
> This works for me for all cases I managed to test:
> 
> ( I have to keep track of the EOL and BOL to ensure that we don't jump to parents or children. )
> 
> (defun heex--treesit-largest-node-at-point (&optional node)
>   "Find the largest node at point or from specified NODE."
>   (save-excursion
>     (forward-comment (point-max))
>     (let ((node-list
>            (cl-loop for node = (or node (treesit-node-at (point)))
>                     then (treesit-node-parent node)
>                     while (and node (not (equal (treesit-node-type node) "fragment")))
>                     if (eq (treesit-node-start node)
>                            (point))
>                     collect node)))
>       (car (last node-list)))))

For largest node at point, you can probably use something like

(treesit-parent-while (or node (treesit-node-at (point)))
                      (lambda (n) (eq (treesit-node-start n) (point))))

Yuan