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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-derive --help
cargo
USAGE:
cargo <SUBCOMMAND>
OPTIONS:
-h, --help Print help information
SUBCOMMANDS:
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)
$ cargo-example-derive example-derive --help
cargo-example-derive [..]
A simple to use, efficient, and full-featured Command Line Argument Parser
USAGE:
cargo example-derive [OPTIONS]
OPTIONS:
-h, --help Print help information
--manifest-path <MANIFEST_PATH>
-V, --version Print version information
Then to directly invoke the command, run:
$ cargo-example-derive example-derive
None
$ cargo-example-derive example-derive --manifest-path Cargo.toml
Some("Cargo.toml")