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); | |
} |