1For more on creating a custom subcommand, see [the cargo 2book](https://doc.rust-lang.org/cargo/reference/external-tools.html#custom-subcommands). 3The crate [`clap-cargo`](https://github.com/crate-ci/clap-cargo) can help in 4mimicking cargo's interface. 5 6The help looks like: 7```console 8$ cargo-example-derive --help 9Usage: cargo <COMMAND> 10 11Commands: 12 example-derive A simple to use, efficient, and full-featured Command Line Argument Parser 13 help Print this message or the help of the given subcommand(s) 14 15Options: 16 -h, --help Print help 17 18$ cargo-example-derive example-derive --help 19A simple to use, efficient, and full-featured Command Line Argument Parser 20 21Usage: cargo example-derive [OPTIONS] 22 23Options: 24 --manifest-path <MANIFEST_PATH> 25 -h, --help Print help 26 -V, --version Print version 27 28``` 29 30Then to directly invoke the command, run: 31```console 32$ cargo-example-derive example-derive 33None 34 35$ cargo-example-derive example-derive --manifest-path Cargo.toml 36Some("Cargo.toml") 37 38``` 39