BiScoped DSL

farm.rb

class Farm

  attr_accessor :animals

  def initialize(&block)
    @animals = []

    block.arity == 1 ? yield(self) : self.instance_eval(&block)

  end

  def animal(animal_name)
    @animals << animal_name
  end

  def to_s
    @animals.join ","
  end


end

myFarm.rb

$LOAD_PATH.unshift(File.dirname(__FILE__))

require 'farm.rb'

myFarm = Farm.new do |f|
  f.animal :sheep
  f.animal :dog
  f.animal :cow
  f.animal :cat
end

puts myFarm.to_s

myOtherFarm.rb

$LOAD_PATH.unshift(File.dirname(__FILE__))

require 'farm.rb'

myFarm = Farm.new do
  animal :manatee
  animal :walrus
  animal :platypus
  animal :shaved_lemur
end

puts myFarm.to_s