1 | use clap::{arg, command, value_parser}; |
2 | |
3 | fn main() { |
4 | let matches = cmd().get_matches(); |
5 | |
6 | // Note, it's safe to call unwrap() because the arg is required |
7 | let port: usize = *matches |
8 | .get_one::<usize>("PORT" ) |
9 | .expect("'PORT' is required and parsing will fail if its missing" ); |
10 | println!("PORT = {port}" ); |
11 | } |
12 | |
13 | fn cmd() -> clap::Command { |
14 | command!() // requires `cargo` feature |
15 | .arg( |
16 | arg!(<PORT>) |
17 | .help("Network port to use" ) |
18 | .value_parser(value_parser!(usize)), |
19 | ) |
20 | } |
21 | |
22 | #[test] |
23 | fn verify_cmd() { |
24 | cmd().debug_assert(); |
25 | } |
26 | |