class Puma::Rack::Builder

def self.parse_file(config, opts = Options.new)
  options = {}
  if config =~ /\.ru$/
    cfgfile = ::File.read(config)
    if cfgfile[/^#\\(.*)/] && opts
      options = opts.parse! $1.split(/\s+/)
    end
    cfgfile.sub!(/^__END__\n.*\Z/m, '')
    app = new_from_string cfgfile, config
  else
    require config
    app = Object.const_get(::File.basename(config, '.rb').capitalize)
  end
  [app, options]
end