structopt 0.3.1

Parse command line argument by defining a struct.
Documentation 
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// Copyright 2018 Guillaume Pinot (@TeXitoi) <texitoi@texitoi.eu>
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.

use structopt::StructOpt;

#[derive(StructOpt, Debug)]
struct Opt {
    #[structopt(raw(case_insensitive = "true"))]
    s: String,
}

fn main() {
    let opt = Opt::from_args();
    println!("{:?}", opt);
}