class ActiveSupport::OptionMerger

def initialize(context, options)
  @context, @options = context, options
end

def method_missing(method, *arguments, &block)
  if arguments.first.is_a?(Proc)
    proc = arguments.pop
    arguments << lambda { |*args| @options.deep_merge(proc.call(*args)) }
  else
    arguments << (arguments.last.respond_to?(:to_hash) ? @options.deep_merge(arguments.pop) : @options.dup)
  end
  @context.__send__(method, *arguments, &block)
end