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// Copyright 2018 Guillaume Pinot (@TeXitoi) <>
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
//> or the MIT license
// <LICENSE-MIT or>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
extern crate structopt;
use structopt::StructOpt;
#[derive(StructOpt, Debug)]
#[structopt(name = "example", about = "An example of StructOpt usage.")]
struct Opt {
/// A flag, true if used in the command line.
#[structopt(short = "d", long = "debug", help = "Activate debug mode")]
debug: bool,
/// An argument of type float, with a default value.
short = "s",
long = "speed",
help = "Set speed",
default_value = "42"
speed: f64,
/// Needed parameter, the first on the command line.
#[structopt(help = "Input file")]
input: String,
/// An optional parameter, will be `None` if not present on the
/// command line.
#[structopt(help = "Output file, stdout if not present")]
output: Option<String>,
fn main() {
let opt = Opt::from_args();
println!("{:?}", opt);