For more on creating a custom subcommand, see the cargo
book.
The crate clap-cargo
can help in
mimicking cargo's interface.
The help looks like:
$ cargo-example --help
Usage: cargo <COMMAND>
Commands:
example 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 example --help
A simple to use, efficient, and full-featured Command Line Argument Parser
Usage: cargo example [OPTIONS]
Options:
--manifest-path <PATH>
-h, --help Print help
-V, --version Print version
Then to directly invoke the command, run:
$ cargo-example example
None
$ cargo-example example --manifest-path Cargo.toml
Some("Cargo.toml")