args.rs

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

pub fn parse_args<'a>() -> ArgMatches<'a, 'a> {
  let matches = App::new("lod")
    .version(&crate_version!()[..])
    .author("Christopher R. Miller <mysteriouspants@outlook.com")
    .about("LOD archive utility.")
    .subcommand_required(true)
    .versionless_subcommands(true)
    .unified_help_message(true)
    .subcommand_required_else_help(true)
    .arg(Arg::with_name("verbose")
      .short("v")
      .multiple(true)
      .help("Run in verbose mode"))
    .subcommand(SubCommand::with_name("list")
      .about("lists the files in a LOD archive")
      .arg(Arg::with_name("archive_file")
        .help("The archive to read.")
        .index(1)
        .required(true)))
    .get_matches();

  return matches;
}

main.rs

extern crate clap;

#[macro_use] mod args;

use args::*;

fn main() {
  let args = parse_args();

  // presumably do more things here :)
}