gistfile1.rbx

module MethodMissingSuga
  def method_missing(m, *args, &block)
    args[0].instance_eval(&block) if block
    args.empty? ? options[m] : options[m] = args[0]
  end
  def options
    @options ||= {}
  end
  def initialize(&block)
    self.instance_eval(&block) if block
  end
end
class Doc
  include MethodMissingSuga
end
class Goose
  include MethodMissingSuga
end
class Red
  include MethodMissingSuga
end
d = Doc.new do
  hi "you"
  mydoc Goose.new do
    who 'me'
    yes Red.new do
      you "you"
    end
    no 1    
  end
end
# When instance evaluating within the d Doc, hi is sent "you" as args
#  but inside the block, mydoc's who is NOT sent "me." Instead, it is 
#  sent nil

puts d.hi # => you
puts d.mydoc # => #<Doc:0x338308>
puts d.mydoc.who # => me
puts d.mydoc.yes # => #<Doc:0x337f5c>
puts d.mydoc.yes.you # => you
puts d.mydoc.no # => a, b, c