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