method_added example 1

descriptor.rb

class Descriptor
  def self.desc(input)
    @desc = input
  end

  def self.method_added(method_name)
    puts "Adding #{method_name.inspect}: description is #{@desc}"

    @desc = nil
  end

  desc "My description"
  def run
  end
end

### When defining the class, this is the output:
#
# Adding :run: description is My description
# => :run