vscode-mar

Language support for the Mar programming language.

Features

• Syntax highlighting for .mar files.
• Diagnostics (parse + type errors as squiggles).
• Hover (type signatures).
• Go-to-definition.
• Find references.
• Rename.
• Workspace + document symbols (outline, breadcrumbs, file picker).
• Completion (autocomplete top-level names with type info).
• Inlay hints (inferred types shown inline next to definitions without explicit signatures).
• Code actions:
  • Quick fix "Did you mean X?" for typos that are close to a known symbol.
  • Quick fix "Replace with field" for missing-field errors.
  • Refactor "Add type annotation" inserts the inferred signature above a value declaration.
• Format on save (calls mar format over the open document).

Requirements

The mar binary must be on your $PATH, or you can override the path in your settings:

{
  "mar.serverPath": "/path/to/mar"
}

Development

cd vscode-mar
npm install
npm run compile

Then in VSCode, Run → Start Debugging (F5) to launch an Extension Development Host with the extension loaded. Open any .mar file to activate it.

Packaging

npm install
npm run compile
npm run package    # produces mar-language-support-X.Y.Z.vsix
code --install-extension mar-language-support-0.0.7.vsix