augment_args.rs - mozsearch

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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:#?}");