| 1 | use clap::{arg, Args, Command, FromArgMatches as _}; |
| 2 | |
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| 3 | #[derive(Args, Debug)] |
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| 4 | struct DerivedArgs { |
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| 5 | #[arg(short, long)] |
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| 6 | derived: bool, |
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| 7 | } |
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| 8 | |
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| 9 | fn main() { |
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| 10 | let cli = Command::new("CLI" ).arg(arg!(-b - -built).action(clap::ArgAction::SetTrue)); |
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| 11 | // Augment built args with derived args |
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| 12 | let cli = DerivedArgs::augment_args(cli); |
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| 13 | |
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| 14 | let matches = cli.get_matches(); |
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| 15 | println!("Value of built: {:?}" , matches.get_flag("built" )); |
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| 16 | println!( |
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| 17 | "Value of derived via ArgMatches: {:?}" , |
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| 18 | matches.get_flag("derived" ) |
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| 19 | ); |
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| 20 | |
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| 21 | // Since DerivedArgs implements FromArgMatches, we can extract it from the unstructured ArgMatches. |
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| 22 | // This is the main benefit of using derived arguments. |
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| 23 | let derived_matches = DerivedArgs::from_arg_matches(&matches) |
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| 24 | .map_err(|err| err.exit()) |
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| 25 | .unwrap(); |
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| 26 | println!("Value of derived: {derived_matches:#?}" ); |
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| 27 | } |
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| 28 | |
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