CLI and Editor

The Rune CLI lives at cmd/rune.

rune check <path>      Parse and type-check a file or directory
rune fmt <path>        Format a file or directory (alias: format)
rune run <path>        Run a file, or a directory with one main
rune build <file.rn>   Compile a Rune program to an executable
rune ts <file.rn>      Compile a Rune program to TypeScript
rune repl              Start the Rune REPL
rune lsp               Start the Rune language server

Use it through go run during development:

go run ./cmd/rune check examples/fib.rn
go run ./cmd/rune check core
go run ./cmd/rune run examples/fib.rn
go run ./cmd/rune ts examples/counter.rn

Or build a binary:

go build -o .bin/rune ./cmd/rune

Formatting

go run ./cmd/rune fmt examples/fib.rn

The formatter normalizes declarations, object fields, arrays, blocks, match branches, XML expressions, and comments.

REPL

go run ./cmd/rune repl

The REPL evaluates expressions and declarations through the interpreter path and does not require a main function.

Language Server

go run ./cmd/rune lsp

rune lsp serves over stdio by default and also accepts --stdio.

The VSCode extension in vscode-rune/ provides:

• TextMate highlighting.
• Snippets.
• Diagnostics.
• Hover.
• Completion.
• Go to definition.
• Rename.
• Document symbols.
• Formatting.
• Inlay hints for inferred function and lambda types.
• Run and debug code lenses for main.

Local VSCode development:

scripts/dev.sh --vscode