irc 0.13.1

extern crate args;
extern crate getopts;
extern crate irc;

use std::env;
use std::process::exit;

use args::{Args, ArgsError};
use getopts::Occur;
use irc::client::data::Config;

const PROGRAM_DESC: &str = "Use this program to convert configs between {JSON, TOML, YAML}.";
const PROGRAM_NAME: &str = "convertconf";

fn main() {
    let args: Vec<_> = env::args().collect();
    match parse(&args) {
        Ok(Some((ref input, ref output))) => {
            let mut cfg = Config::load(input).unwrap();
            cfg.save(output).unwrap();
            println!("Converted {} to {}.", input, output);
        }
        Ok(None) => {
            println!("Failed to provide required arguments.");
            exit(1);
        }
        Err(err) => {
            println!("{}", err);
            exit(1);
        }
    }
}

fn parse(input: &[String]) -> Result<Option<(String, String)>, ArgsError> {
    let mut args = Args::new(PROGRAM_NAME, PROGRAM_DESC);
    args.flag("h", "help", "Print the usage menu");
    args.option("i",
                "input",
                "The path to the input config",
                "FILE",
                Occur::Req,
                None);
    args.option("o",
                "output",
                "The path to output the new config to",
                "FILE",
                Occur::Req,
                None);

    args.parse(input)?;

    let help = args.value_of("help")?;
    if help {
        args.full_usage();
        return Ok(None);
    }

    Ok(Some((
        args.value_of("input")?,
        args.value_of("output")?,
    )))
}