Ruby keyword arguments extention

keyword_arg.rb

class BasicObject
  class << self
    def func(args, &block)
      method = args[:method]
      args_map = args[:args]
      define_method(method) do |args|
        keys = args_map.values.map { |v| ":#{v}" }.join(',')
        values = args_map.keys.map { |k| "'#{args[k]}'"}.join(',')
        s = eval("Struct.new(#{keys}).new(#{values})")
        s.instance_eval(&block)
      end
    end

    def method_missing(method, *args)
      super unless args.first.is_a?(Hash)
      return {:args => args.first, :method => method}
    end
  end
end

class A
  func write(with: :text, for: :pipe) do
    puts text
  end
end

a = A.new
a.write(with: "message", for: "hoge")