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For more on creating a custom subcommand, see [the cargo
book](https://doc.rust-lang.org/cargo/reference/external-tools.html#custom-subcommands).
The crate [`clap-cargo`](https://github.com/crate-ci/clap-cargo) can help in
mimicking cargo's interface.
The help looks like:
```console
$ cargo-example-derive --help
Usage: cargo <COMMAND>
Commands:
example-derive A simple to use, efficient, and full-featured Command Line Argument Parser
help Print this message or the help of the given subcommand(s)
Options:
-h, --help Print help
$ cargo-example-derive example-derive --help
A simple to use, efficient, and full-featured Command Line Argument Parser
Usage: cargo example-derive [OPTIONS]
Options:
--manifest-path <MANIFEST_PATH>
-h, --help Print help
-V, --version Print version
```
Then to directly invoke the command, run:
```console
$ cargo-example-derive example-derive
None
$ cargo-example-derive example-derive --manifest-path Cargo.toml
Some("Cargo.toml")
```
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