Method build_prefix

crates/csskit/src/commands/tree.rs:170–185

Build the tree prefix (vertical bars and connectors) for a node.

(&self, visitor: &CollectionVisitor, node_idx: usize, node_depth: usize)

	/// Build the tree prefix (vertical bars and connectors) for a node.
	fn build_prefix(&self, visitor: &CollectionVisitor, node_idx: usize, node_depth: usize) -> String {
		let mut prefix = String::new();

		// For each ancestor level, determine if we need a vertical bar
		for d in 0..node_depth.saturating_sub(1) {
			let ancestor_idx = visitor.find_ancestor_at_depth(node_idx, d + 1);
			let show_bar = ancestor_idx.is_none_or(|idx| !visitor.is_last_child(idx));
			prefix.push_str(if show_bar { "│  " } else { "   " });
		}

		// Add the connector for this node
		let connector = if visitor.is_last_child(node_idx) { "╰─ " } else { "├─ " };
		prefix.push_str(connector);

		prefix
	}
}