Lem integrates tree-sitter for advanced syntax highlighting and indentation. Tree-sitter provides incremental parsing that can efficiently update syntax trees as you edit, enabling features that understand code structure rather than just patterns. Overview The tree-sitter integration in Lem provides: Syntax Highlighting: Accurate, language-aware highlighting based on AST nodes Indentation: Structure-based indentation using tree-sitter queries Incremental Parsing: Efficient updates without re-parsing entire files Graceful Fallback: Falls back to regex-based highlighting when tree-sitter is unavailable Architecture ┌─────────────────┐ │ tree-sitter-cl │ │ (FFI bindings) │ └────────┬────────┘ │ ┌─────────────────┐ ┌────────▼────────┐ │ Language Mode │──────────▶│ lem-tree-sitter │ │ (json, nix.