api-getopts.rs

//! <https://crates.io/crates/getopts>
//! <https://docs.rs/getopts/0.2.18/getopts/>
//!
//! Tested with rust-1.3.0 and getopts-0.2.14
//!
//! @license MIT license <http://www.opensource.org/licenses/mit-license.php>
//!
//! @since 2014-02-09

extern crate getopts;
use getopts::Options;
use std::env;

fn do_work(inp: &str, out: Option<String>) {
    println!("{}", inp);
    match out {
        Some(x) => println!("{}", x),
        None => println!("No Output"),
    }
}

fn print_usage(program: &str, opts: Options) {
    let brief = format!("Usage: {} FILE [options]", program);
    print!("{}", opts.usage(&brief));
}

#[cfg(not(test))]
fn main() {
    let args: Vec<String> = env::args().collect();

    let program = args[0].clone();

    let mut opts = Options::new();
    opts.optopt("o", "", "set output file name", "NAME");
    opts.optflag("h", "help", "print this help menu");

    let matches = match opts.parse(&args[1..]) {
        Ok(m) => m,
        Err(f) => {
            panic!("Error: {}", f)
        }
    };
    if matches.opt_present("h") {
        print_usage(&program, opts);
        return;
    }
    let output = matches.opt_str("o");
    let input = if !matches.free.is_empty() {
        matches.free[0].clone()
    } else {
        print_usage(&program, opts);
        return;
    };
    do_work(&input, output);
}