| 1 | use clap::{Parser, ValueEnum}; |
| 2 | |
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| 3 | #[derive(Parser)] |
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| 4 | #[command(author, version, about, long_about = None)] |
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| 5 | struct Cli { |
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| 6 | /// What mode to run the program in |
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| 7 | #[arg(value_enum)] |
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| 8 | mode: Mode, |
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| 9 | } |
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| 10 | |
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| 11 | #[derive(Copy, Clone, PartialEq, Eq, PartialOrd, Ord, ValueEnum)] |
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| 12 | enum Mode { |
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| 13 | /// Run swiftly |
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| 14 | Fast, |
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| 15 | /// Crawl slowly but steadily |
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| 16 | /// |
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| 17 | /// This paragraph is ignored because there is no long help text for possible values. |
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| 18 | Slow, |
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| 19 | } |
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| 20 | |
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| 21 | fn main() { |
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| 22 | let cli = Cli::parse(); |
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| 23 | |
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| 24 | match cli.mode { |
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| 25 | Mode::Fast => { |
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| 26 | println!("Hare" ); |
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| 27 | } |
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| 28 | Mode::Slow => { |
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| 29 | println!("Tortoise" ); |
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| 30 | } |
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| 31 | } |
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| 32 | } |
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| 33 | |
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