clap 3.2.16

A simple to use, efficient, and full-featured Command Line Argument Parser
Documentation 
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use clap::{ArgEnum, Parser};

#[derive(Parser)]
#[clap(author, version, about, long_about = None)]
struct Cli {
    /// What mode to run the program in
    #[clap(arg_enum, value_parser)]
    mode: Mode,
}

#[derive(Copy, Clone, PartialEq, Eq, PartialOrd, Ord, ArgEnum)]
enum Mode {
    Fast,
    Slow,
}

fn main() {
    let cli = Cli::parse();

    match cli.mode {
        Mode::Fast => {
            println!("Hare");
        }
        Mode::Slow => {
            println!("Tortoise");
        }
    }
}