module Paperclip::ProcessorHelpers

def clear_processors!
  @known_processors.try(:clear)
end

def load_processor(name)
  if defined?(Rails.root) && Rails.root
    filename = "#{name.to_s.underscore}.rb"
    directories = %w(lib/paperclip lib/paperclip_processors)
    required = directories.map do |directory|
      pathname = File.expand_path(Rails.root.join(directory, filename))
      file_exists = File.exist?(pathname)
      require pathname if file_exists
      file_exists
    end
    raise LoadError, "Could not find the '#{name}' processor in any of these paths: #{directories.join(', ')}" unless required.any?
  end
end

def processor(name) #:nodoc:
  @known_processors ||= {}
  if @known_processors[name.to_s]
    @known_processors[name.to_s]
  else
    name = name.to_s.camelize
    load_processor(name) unless Paperclip.const_defined?(name)
    processor = Paperclip.const_get(name)
    @known_processors[name.to_s] = processor
  end
end

def register_processor(name, processor)
  @known_processors ||= {}
  @known_processors[name.to_s] = processor
end