class Hashie::Mash

def self.load(path, options = {})
  @_mashes ||= new
  return @_mashes[path] if @_mashes.key?(path)
  fail ArgumentError, "The following file doesn't exist: #{path}" unless File.file?(path)
  parser = options.fetch(:parser) {  Hashie::Extensions::Parsers::YamlErbParser }
  @_mashes[path] = new(parser.perform(path)).freeze
end