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use clap::{arg, command, value_parser};
fn main() {
let matches = cmd().get_matches();
// Note, it's safe to call unwrap() because the arg is required
let port: usize = *matches
.get_one::<usize>("PORT")
.expect("'PORT' is required and parsing will fail if its missing");
println!("PORT = {port}");
}
fn cmd() -> clap::Command {
command!() // requires `cargo` feature
.arg(
arg!(<PORT>)
.help("Network port to use")
.value_parser(value_parser!(usize)),
)
}
#[test]
fn verify_cmd() {
cmd().debug_assert();
}
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