argparser.rb

require 'ap'

options = Hash.new(nil)
key = nil

ARGV.each do |arg|
  arg = arg.dup
  if arg.gsub!(/^--/, '')
    key = arg.to_sym
    options[key] = true
  else
    if key
      options[key] = arg
      key = nil
    end
  end
end

ap options