clap 3.0.0

A simple to use, efficient, and full-featured Command Line Argument Parser
Documentation 
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use clap::{AppSettings, Parser, Subcommand};

#[derive(Parser)]
#[clap(author, version, about)]
#[clap(global_setting(AppSettings::PropagateVersion))]
#[clap(global_setting(AppSettings::UseLongFormatForHelpSubcommand))]
#[clap(setting(AppSettings::SubcommandRequiredElseHelp))]
struct Cli {
    #[clap(subcommand)]
    command: Commands,
}

#[derive(Subcommand)]
enum Commands {
    /// Adds files to myapp
    Add { name: Option<String> },
}

fn main() {
    let cli = Cli::parse();

    // You can check for the existence of subcommands, and if found use their
    // matches just as you would the top level app
    match &cli.command {
        Commands::Add { name } => {
            println!("'myapp add' was used, name is: {:?}", name)
        }
    }
}