LUAR

VS Code support for the LUAR language, with a Rust backend.

Features

• File icon — .luar files show the LUAR logo (icons/laur_logo.png).
• Syntax highlighting — a TextMate grammar colours keywords (const, local, pub, class, function, if/then/end, …), built-ins, strings, numbers and comments (syntaxes/luar.tmLanguage.json).
• Auto-indent / editing — indentation rules, bracket matching, auto-closing pairs and -- comments (language-configuration.json).
• Rust language server (server/) providing:
  • diagnostics from LUAR's static checker Ferrite (unused variables, mutating immutables, unreachable code, duplicate keys, …), live as you type;
  • semantic tokens so keywords / modifiers / types / built-ins are coloured by the backend.

Architecture

luar LSP/
├─ package.json                 manifest: language, grammar, config, client entry
├─ language-configuration.json  indentation / brackets / comments
├─ syntaxes/luar.tmLanguage.json TextMate grammar (highlighting)
├─ icons/laur_logo.png          the .luar file icon
├─ client/src/extension.ts      thin client; launches the Rust server over stdio
├─ server/                      the Rust LSP backend (tower-lsp)
│  └─ src/main.rs               reuses the `luar` crate's lexer + Ferrite linter
├─ bin/server.exe              the bundled, compiled server
└─ out/extension.js            the bundled client

The server reuses the luar crate directly (../../Luar), so the editor and the language share one lexer and one linter.

Build

npm install
npm run build        # builds the Rust server (release) AND bundles the client

Individually: npm run build:server (cargo + copy into bin/) and npm run build:client (esbuild → out/extension.js).

Package / install

npm install -g @vscode/vsce
vsce package --allow-missing-repository
code --install-extension luar-lang-0.3.0.vsix --force

Then reload VS Code. Open a .luar file: keywords are coloured, Enter auto-indents inside blocks, and Ferrite warnings appear as squiggles.