| use clap::{Parser, ValueEnum}; |
| |
| #[derive(Parser)] |
| #[command(author, version, about, long_about = None)] |
| struct Cli { |
| /// What mode to run the program in |
| #[arg(value_enum)] |
| mode: Mode, |
| } |
| |
| #[derive(Copy, Clone, PartialEq, Eq, PartialOrd, Ord, ValueEnum)] |
| enum Mode { |
| /// Run swiftly |
| Fast, |
| /// Crawl slowly but steadily |
| /// |
| /// This paragraph is ignored because there is no long help text for possible values. |
| Slow, |
| } |
| |
| fn main() { |
| let cli = Cli::parse(); |
| |
| match cli.mode { |
| Mode::Fast => { |
| println!("Hare"); |
| } |
| Mode::Slow => { |
| println!("Tortoise"); |
| } |
| } |
| } |
