function format() {
  for (var _len = arguments.length, args = new Array(_len), _key = 0; _key < _len; _key++) {
    args[_key] = arguments[_key];
  }

  var a = args[0];
  var b = [];
  var c;

  for (c = 1; c < args.length; c += 1) {
    b.push(args[c]);
  }

  b.forEach(function (d) {
    a = a.replace(/%[a-z]/, d);
  });
  return a;
}
super basic version of sprintf
@private