gistfile1.rb

# not sure if i like this or not
# but it was fun to write!

# :Foo => Foo, :Foo, :Bar => Foo::Bar, etc
def with_foo_like_class(*args)
  klass = if args.size == 1
    klass_obj = Class.new
    Object.const_set(args[0], klass_obj)
  else
    klass_sym = args.pop
    parents = args.inject([]) do |namespaces, name|
      (namespaces.last || Object).module_eval do
        namespaces << const_set(name, Module.new)
      end
    end

    parents.last.module_eval do
      klass_obj = Class.new
      const_set(klass_sym, klass_obj)
    end
  end

  klass.class_eval { extend Foo }
  yield(klass)
  Object.send(:remove_const, args[0])
end