Tooling

A formatter, a language server, and an extension for two editors.

Formatting

scarlet fmt formats in place. Source indentation is tabs. Run scarlet fmt --check . in CI; it exits 1 when a file is unformatted.

Editors

• scarlet lsp serves diagnostics, completions, and formatting to any LSP editor. Diagnostics print as path:line:col: message.
• Visual Studio Code: the Scarlet extension in editors/vscode provides highlighting, diagnostics, and formatting. It runs the scarlet binary from your path; the scarlet.binaryPath setting overrides it.
• Zed: the extension in editors/zed registers the language and wires scarlet lsp. Install it as a dev extension.