rimraf with deferred/promise

rimraf.js

var path = require('path')
  , fs = require('fs')
  , deferred = require('deferred'), delay = deferred.delay
  , promisify = deferred.promisify
  , lstat = promisify(fs.lstat), unlink = promisify(fs.unlink), readdir = promisify(fs.readdir)
  , rmdir = promisify(fs.rmdir)

var timeout = 0;
var rimraf = module.exports = function (p, opts) {
  opts = opts || {};
  opts.maxBusyTries = opts.maxBusyTries || 3;
  var busyTries = 0;

  return rimraf_(p, opts)
}

var rimraf_ = function (p, opts) {
  return lstat(p)
  (function (stat) {
    if (!stat.isDirectory()) return unlink(p);
    return readdir(p).map(function(file) {
      return rimraf(path.join(p, file), opts);
    })
    (function () {
      return rmdir(p);
    });
  })
  (function () { timeout = 0 }, function CB (ex) {
    if (ex.message.match(/^EMFILE/)) {
      return delay(rimraf_, timeout += 10)(p, opts);
    } else if (ex.message.match(/^EBUSY/) && busyTries < opt.maxBusyTries) {
      return delay(rimraf_, ++busyTries * 100)(p, opts);
    } else {
      throw ex;
    }
  })
};