augment_subcommands.rs

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use clap::{Command, FromArgMatches as _, Parser, Subcommand as _};

#[derive(Parser, Debug)]

enum Subcommands {

    Derived {

        #[arg(short, long)]

        derived_flag: bool,

},

fn main() {

    let cli = Command::new("Built CLI");

    // Augment with derived subcommands

    let cli = Subcommands::augment_subcommands(cli);

    let matches = cli.get_matches();

    let derived_subcommands = Subcommands::from_arg_matches(&matches)

        .map_err(|err| err.exit())

        .unwrap();

    println!("Derived subcommands: {derived_subcommands:#?}");