gistfile1.rb

module AttrReaderWriter
  def attr_reader_or_writer(*keys)
    keys.flatten.each do |key|
      class_eval <<-RUBY, __FILE__, __LINE__
        def #{key}(val = nil)
          @#{key} = val || @#{key}
        end
      RUBY
    end
  end
end

class Test
  extend AttrReaderWriter
  attr_reader_or_writer :name
end

t = Test.new
t.name #=> nil
t.name :foo
t.name #=> :foo