if let Ok(opts) = Opts::try_parse() {
        if let Err(e) = run(opts).await {
            writeln!(std::io::stderr(), "Error: {}", e).unwrap_or(());
            std::process::exit(1);

    match external_command() {
        Ok(false) => {
            let opts = Opts::parse();
            if let Err(e) = run(opts).await {
                writeln!(std::io::stderr(), "Error: {}", e).unwrap_or(());
                std::process::exit(1);
            }
        }
        Ok(true) => (),
        Err((cmd, e)) => {
            writeln!(
                std::io::stderr(),
                "Error while trying to run {:?}: {}",
                cmd,
                e
            )
            .unwrap_or(());

    } else if let Err((cmd, e)) = external_command() {
        writeln!(
            std::io::stderr(),
            "Error while trying to run {:?}: {}",
            cmd,
            e
        )
        .unwrap_or(());

fn external_command() -> Result<(), (String, std::io::Error)> {

fn external_command() -> Result<bool, (String, std::io::Error)> {

    use clap::IntoApp;
    let app = Opts::into_app();

            if app
                .get_subcommands()
                .any(|sub| sub.get_name() == arg || sub.get_all_aliases().any(|al| al == arg))
            {
                return Ok(false);
            }

        Ok(())

        Ok(true)