gistfile1.js

var http = require('http'),
    sys = require('sys'),
    path = require('path'),
    posix = require('posix'),
    events = require('events');
 
var 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;
}

var walk = function (pathname, callback) {
  var counter=1;
  var promise = new process.Promise();
  go(pathname);
  return promise;
  function go(pathname){
    listdir(pathname).addCallback(function(files) {
      counter--;
      files.forEach(function(f) {
        var abspath = path.join(pathname, f);
        posix.stat(abspath).addCallback(function(stat) {
          if (stat.isDirectory()) {
            counter++;
            go(abspath);
          } else {
            callback(abspath);
          }
        });
      });
      if(!counter) promise.emitSuccess();
    });
  }
}

walk('/home/node', function() {});