Rake 里 desc 方法的简单实现

[manxingxing]

module Annotation
  def desc(description)
    @_last_description = description
  end

  def method_added(method_name)
    description = get_last_description
    descriptions[method_name.to_sym] = description if description
    super
  end

  def get_last_description
    description = @_last_description
    @_last_description = nil
    description
  end

  def descriptions
    @_descriptions ||= {}
  end
end

class A
  extend Annotation

  desc 'foo method'
  def foo
  end
end