module.exports = parse;

// Inspired a bit by
// https://github.com/eveningkid/args-parser/blob/master/parse.js

function parse(argv) {
  argv = process.argv.slice(2);
  let output = {};
  
  argv.forEach((arg) => {
    // We'll treat `--long` flags and flags without dash prefixes the same,
    // so just discard double-dash prefixes
    if (arg.startsWith('--')) { arg = arg.substring(2); }

    // Handle grouped short flags (eg `ps -aux`)
    // (Let's not let grouped ones have values) //... FIXME, maybe?
    if (arg.startsWith('-')) {
      if (arg.length < 2) {
        // It's not grouped; just remove the '-' and treat it like the rest, later
        arg = arg.substring(1);
      } else {
        arg = arg.substring(1);
        let ungrouped = arg.split('');
        ungrouped.forEach(a => output[a] = true);
        return;
      }
    }

    let split = arg.split('=')
    if (split.length > 2) { throw new Error(`Too many '=' in argument ${arg}`); }
    if (split.length === 2) {
      let [key, value] = split;
      output[key] = value;
      return;
    }

    output[arg] = true;
  });

  return output;
}