gistfile1.js

var http = require('http'),
    sys = require('sys'),
    path = require('path'),
    posix = require('posix'),
    events = require('events');
 
var Walker = function() {
  this._counter = 0;
};
Walker.prototype = {
  _listDir: function (pathname) {
    var p = new events.Promise();
    var ls = process.createChildProcess("ls", [pathname]);
    ls.addListener("output", function (data) {
      if (data) {
        var files = [];
        data.split('\n').forEach(function(f) {if (f){files.push(f)}});
        p.emitSuccess(files)
      }
    });
    return p;
  },
  walk: function (pathname, callback) {
    var self = this;
    this._listDir(pathname).addCallback(function(files) {
      var dir = false;
      files.forEach(function(f) {
        self._counter++;
        var abspath = path.join(pathname, f);
        posix.stat(abspath).addCallback(function(stat) {
          self._counter--;
          if (stat.isDirectory()) {
            dir = true;
            self.walk.call(self, abspath, callback);
          } else
            callback.call(self, abspath);
          if (false === dir && 0 >= self._counter)
            callback.call(self, null);
        });
      });
    });
  }
};

new Walker().walk('/home/node', function(file) {
  if (null === file)
    this.walk( ... ); // Do some more walking
});