module Spec
  module Expectations
    # This module adds syntactic sugar that allows usage of should_* instead of should.*
    module UnderscoreSugar
      def handle_underscores_for_rspec!
        original_method_missing = instance_method(:method_missing)
        class_eval do
          def method_missing(sym, *args, &block)
            _method_missing(sym, args, block)
          end

          define_method :_method_missing do |sym, args, block|
            return original_method_missing.bind(self).call(sym, *args, &block) unless sym.to_s =~ /^should_/
            return Spec::Expectations::Should::Should.new(self).__send__(__strip_should(sym), *args, &block)
          end

          def __strip_should sym
            sym.to_s[7..-1]
          end
        end
      end
    end
  end
end


# ..then
class Object
  include Should::Expectations::UnderscoreSugar
end
Object.handle_underscores_for_rspec!