clap/examples/tutorial_builder/04_02_parse.rs

18 lines
476 B
Rust
Raw Normal View History

2022-02-15 14:33:38 +00:00
use clap::{arg, command};
fn main() {
2022-02-15 14:33:38 +00:00
let matches = command!()
.arg(
arg!(<PORT>)
.help("Network port to use")
.validator(|s| s.parse::<usize>()),
)
.get_matches();
// Note, it's safe to call unwrap() because the arg is required
let port: usize = matches
.value_of_t("PORT")
.expect("'PORT' is required and parsing will fail if its missing");
println!("PORT = {}", port);
}