class Thor::Options

def self.to_switches(options)
  options.map do |key, value|
    case value
      when true
        "--#{key}"
      when Array
        "--#{key} #{value.map{ |v| v.inspect }.join(' ')}"
      when Hash
        "--#{key} #{value.map{ |k,v| "#{k}:#{v}" }.join(' ')}"
      when nil, false
        ""
      else
        "--#{key} #{value.inspect}"
    end
  end.join(" ")
end