var reLeadingHyphen = /^\-+/

function reduceArgs(collection, arg, idx) {
  var key
  if (arg[0] === '-') {
    key = arg.replace(reLeadingHyphen, '')
    collection[key] = null,
    collection.__wantsValue = key
  } else if (collection.__wantsValue !== null) {
    collection[collection.__wantsValue] = arg
    collection.__wantsValue = null
  } else {

    if (!collection.ordered) {
      collection.ordered = []
    }
    collection.ordered.push(arg)
  }

  return collection
}

module.exports = function(argv) {
  var args = argv.slice(2)
  var argMap = args.reduce(reduceArgs, { __wantsValue: null })

  delete(argMap['__wantsValue'])
  return argMap
}