Hydrogen Language Tools

Local VS Code support for Hydrogen / Hylang.

Features

• Syntax highlighting for .hy files.
• Basic highlighting for .hyproj project manifests.
• Snippets for namespaces, classes, Main, loops, and console output.
• Document formatting:
  • Uses hy fmt when available.
  • Falls back to a simple brace-aware formatter when hy is missing.
• Diagnostics:
  • Built-in checks for missing closing {}, [], (), quotes, and block comments.
  • Warning when using appears after a namespace declaration.
  • Optional hy check <target> --json diagnostics.

Install

From the folder containing the VSIX:

code --install-extension hydrogen-language-tools-0.1.0.vsix

Or in VS Code:

1. Open Extensions.
2. Choose the ... menu.
3. Select Install from VSIX....
4. Pick hydrogen-language-tools-0.1.0.vsix.

Recommended settings

If hy is not on your PATH, set the CLI path:

{
  "hydrogen.hyPath": "/absolute/path/to/hy"
}

For multi-file projects, set the project or workspace target so diagnostics check the whole project:

{
  "hydrogen.checkTarget": "path/to/YourProject.hyproj"
}

Notes

This extension is intentionally local-first. It does not bundle the Hydrogen compiler. It will still provide syntax highlighting, snippets, fallback formatting, and structural diagnostics without hy installed.