Features

Cross-cutting capabilities — things users care about that span more than one crate. Each feature page maps the user-facing behaviour back to the code paths that implement it.

Pages

• Modal editing — Normal/Select/Insert modes, the keymap pipeline, mode transitions.
• Multiple selections — How Range and Selection flow through every command.
• Syntax highlighting — Tree-sitter, tree-house, queries, themes.
• Language servers — LSP integration, completion, goto, diagnostics, code actions.
• Pickers — Fuzzy file/buffer/symbol/diagnostic finders.
• Debugger — DAP integration, breakpoints, stack inspection.
• Themes — Theme TOML format, scope resolution, runtime themes.

What's not in this section

• The terminal frontend itself is documented in packages/helix-term.
• The text data structure (Rope) and edit model (Transaction) are in primitives/.
• Configuration reference is in reference/configuration.