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Tree-sitter support for Emacs 29+ #282

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Sep 19, 2024
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Tree-sitter support for Emacs 29+ #282

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21 changes: 21 additions & 0 deletions er-basic-expansions.el
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Original file line number Diff line number Diff line change
Expand Up @@ -242,5 +242,26 @@ period and marks next symbol."
er/mark-defun)
er/try-expand-list))

(when (and (>= emacs-major-version 29)
(treesit-available-p))
(defun er/mark-ts-node ()
"Mark tree sitter node around or after point."
(interactive)
(when (treesit-language-at (point))
(let* ((node (if (use-region-p)
(treesit-node-on (region-beginning) (region-end))
(treesit-node-at (point))))
(node-start (treesit-node-start node))
(node-end (treesit-node-end node)))
;; when the node fits the region exactly, try its parent node instead
(when (and (= (region-beginning) node-start)
(= (region-end) node-end))
(when-let ((node (treesit-node-parent node)))
(setq node-start (treesit-node-start node)
node-end (treesit-node-end node))))
(goto-char node-start)
(set-mark node-end))))
(setq er/try-expand-list (append er/try-expand-list '(er/mark-ts-node))))

(provide 'er-basic-expansions)
;;; er-basic-expansions.el ends here