gistfile1.txt

var fs = require('fs')
  , async = require('async');

exports.newUpload = function(path, f) {
  var i = 0
    , p = path;

  async.until(
    function () { 
       p = (i !== 0) ? path + i : path;
       fs.stat(p, function (error, stats) {
         return error && error.code === 'ENOENT'
       });
    },
    function (callback) {
      i++;
      callback();
    },
    function (error) {
      console.dir(p);
      f(error, p);
    }
  );
};