28 lines
889 B
Rust
28 lines
889 B
Rust
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use clap::{arg, Args, Command, FromArgMatches as _};
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#[derive(Args, Debug)]
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struct DerivedArgs {
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#[arg(short, long)]
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derived: bool,
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}
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fn main() {
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let cli = Command::new("CLI").arg(arg!(-b - -built).action(clap::ArgAction::SetTrue));
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// Augment built args with derived args
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let cli = DerivedArgs::augment_args(cli);
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let matches = cli.get_matches();
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println!("Value of built: {:?}", matches.get_flag("built"));
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println!(
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"Value of derived via ArgMatches: {:?}",
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matches.get_flag("derived")
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);
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// Since DerivedArgs implements FromArgMatches, we can extract it from the unstructured ArgMatches.
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// This is the main benefit of using derived arguments.
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let derived_matches = DerivedArgs::from_arg_matches(&matches)
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.map_err(|err| err.exit())
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.unwrap();
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println!("Value of derived: {derived_matches:#?}");
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}
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