clap/examples/myapp.rs

extern crate clap;

use clap::{App, Arg, SubCommand};

fn main() {
	let matches = App::new("MyApp")
						.version("1.0")
						.author("Kevin K. <kbknapp@gmail.com>")
						.about("Does awesome things")
						.arg(Arg::new("config")
									.short("c")
									.long("config")
									.help("Sets a custom config file")
									.takes_value(true))
						.arg(Arg::new("output")
									.help("Sets an optional output file")
									.index(1))
						.arg(Arg::new("debug")
									.short("d")
 									.multiple(true)
									.help("Turn debugging information on"))
						.subcommand(SubCommand::new("test")
												.about("does testing things")
												.arg(Arg::new("list")
															.short("l")
															.help("lists test values")))
						.get_matches();

	if let Some(o) = matches.value_of("output") {
		println!("Value for output: {}", o);
	}
 
	if let Some(c) = matches.value_of("config") {
		println!("Value for config: {}", c);
	}

	match matches.occurrences_of("debug") {
 		0 => println!("Debug mode is off"),
		1 => println!("Debug mode is kind of on"),
		2 => println!("Debug mode is on"),
		3 | _ => println!("Don't be crazy"),
 	}

 	if let Some(ref matches) = matches.subcommand_matches("test") {
 		if matches.is_present("list") {
 			println!("Printing testing lists...");
 		} else {
 			println!("Not printing testing lists...");
 		}
 	}
	print!("App is running...");
	println!("done.");
}