use clap::{arg, command, value_parser}; | |
fn main() { | |
let matches = command!() // requires `cargo` feature | |
.arg( | |
arg!([PORT]) | |
.value_parser(value_parser!(u16)) | |
.default_value("2020"), | |
) | |
.get_matches(); | |
println!( | |
"port: {:?}", | |
matches | |
.get_one::<u16>("PORT") | |
.expect("default ensures there is always a value") | |
); | |
} |