A compiled CLI parser for Rust.

usage-rs is the crate to depend on. It re-exports the derive macros from usage-derive and the runtime from [usage_argv], and gates the cold-path features — spec emission, help rendering, completions, rich diagnostics — behind cargo features so a binary only carries what it uses.

Status

Reserved and empty. See PROGRESS.md for what exists and what is next.

Features

• spec (default) — emit the CLI's usage spec as KDL, the input to usage g markdown|manpage|json and to the completion engine.
• help (default) — render --help from the emitted spec.
• completions — generate shell completion scripts and serve completion requests from the binary itself, with no separate usage install.
• diagnostics — re-parse a failed command line to produce suggestions and usage output. A successful parse never enters this code.