module Sprockets::ProcessorUtils

def compose_processors(*processors)
  context = self
  if processors.length == 1
    obj = method(:call_processor).to_proc.curry[processors.first]
  else
    obj = method(:call_processors).to_proc.curry[processors]
  end
  metaclass = (class << obj; self; end)
  metaclass.send(:define_method, :cache_key) do
    context.processors_cache_keys(processors)
  end
  obj
end