extend-sibling.hx

Extend the selection by one tree-sitter sibling node, for Helix.

Helix’s builtin select_next_sibling / select_prev_sibling replace the whole selection with the neighbouring node. These commands extend it instead, so you can accrete nodes:

• :extend_next_sibling – move the head to the end of the next sibling.
• :extend_prev_sibling – move the head to the start of the previous sibling.

The anchor stays put and only the head moves, as it does for the builtin extend_parent_node_start / extend_parent_node_end. So a forward selection accretes with :extend_next_sibling and shrinks with :extend_prev_sibling; flip it with Alt-; to accrete leftwards instead.

When the current node has no sibling at its level, navigation climbs to the parent, matching the builtin motions. Every range in the selection is moved.

Install

Install with Forge:

forge pkg install --git https://github.com/waddie/extend-sibling.hx

Then in ~/.config/helix/init.scm:

(require "extend-sibling.hx/extend-sibling.scm")

Optionally bind keys, for example:

(keymap (global)
  (normal
    (A-N ":extend_next_sibling")
    (A-P ":extend_prev_sibling"))
  (select
    (A-n ":extend_next_sibling")
    (A-p ":extend_prev_sibling")))

License

Copyright © 2026 Tom Waddington

Distributed under the MIT License. See LICENSE file for details.