class Hashie::Mash

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