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use clap::{arg, command, value_parser};
fn main() {
let matches = command!() // requires `cargo` feature
.arg(
arg!(<PORT>)
.help("Network port to use")
.value_parser(value_parser!(u16).range(1..)),
)
.get_matches();
// Note, it's safe to call unwrap() because the arg is required
let port: u16 = *matches
.get_one::<u16>("PORT")
.expect("'PORT' is required and parsing will fail if its missing");
println!("PORT = {port}");
}