[rustc.git] / vendor / clap-4.3.10 / examples / tutorial_builder / 04_01_possible.rs

use clap::{arg, command};

fn main() {
    let matches = command!() // requires `cargo` feature
        .arg(
            arg!(<MODE>)
                .help("What mode to run the program in")
                .value_parser(["fast", "slow"]),
        )
        .get_matches();

    // Note, it's safe to call unwrap() because the arg is required
    match matches
        .get_one::<String>("MODE")
        .expect("'MODE' is required and parsing will fail if its missing")
        .as_str()
    {
        "fast" => {
            println!("Hare");
        }
        "slow" => {
            println!("Tortoise");
        }
        _ => unreachable!(),
    }
}
Commit	Line	Data
add651ee FG	1	use clap::{arg, command};
	2
	3	fn main() {
	4	let matches = command!() // requires `cargo` feature
	5	.arg(
	6	arg!(<MODE>)
	7	.help("What mode to run the program in")
	8	.value_parser(["fast", "slow"]),
	9	)
	10	.get_matches();
	11
	12	// Note, it's safe to call unwrap() because the arg is required
	13	match matches
	14	.get_one::<String>("MODE")
	15	.expect("'MODE' is required and parsing will fail if its missing")
	16	.as_str()
	17	{
	18	"fast" => {
	19	println!("Hare");
	20	}
	21	"slow" => {
	22	println!("Tortoise");
	23	}
	24	_ => unreachable!(),
	25	}
	26	}