typo on http://book.mixu.net/ch11.html about controlflow HOT 4 CLOSED

  function isMatch(err, stats) {
    if(err) { return callback(err); }
    if(stats.isFile() && file == searchFile) {
      callback(undefined, path+'/'+file);
    } else if(stats.isDirectory()) {
      statDirectory(path+'/'+file);
    }
  }

var fs=require('fs');

function statDirectory(path, searchFile, callback){
    fs.readdir(path, function(err, files){
        if (err){
            return callback(err);
        }
        files.forEach(function(file){
            function isMatch(err, stats){
                if (err){
                    return callback(err);
                }
                if (stats.isFile() && file==searchFile){
                    callback(undefined, path+'/'+file);
                } else if (stats.isDirectory()){
                    statDirectory(path+'/'+file, searchFile, callback);
                }
            }
            fs.stat(path+'/'+file, isMatch);
        });
    });
}

statDirectory('./test', 'needle.txt', function(err, path) {
  if(err) { throw err; }
  console.log('Found file at: '+path);
});

PathIterator.prototype.iterate = function(path) {
  var self = this;
  this.statDirectory(function(fpath, stats) {
    if(stats.isFile()) {
      self.emit('file', fpath, stats);
    } else if(stats.isDirectory()) {
      self.emit('directory', fpath, stats);
      self.iterate(path+'/'+file);
    }
  });
};

// iterate path, emitting 'file' and 'directory' events
PathIterator.prototype.iterate=function(path){
    var self=this;
    this.statDirectory(path, function(fpath, stats){
        if (stats.isFile()){
            self.emit('file', fpath, stats);
        } else if (stats.isDirectory()){
            self.emit('directory', fpath, stats);
            self.iterate(fpath);
        }
    });
};

function findFile(path, searchFile, callback) {
  var pi = new PathIterator();
  pi.on('file', function(file, stats) {
    if(file == searchFile) {
      callback(undefined, file);
    }
  });
  pi.on('error', callback);
  pi.iterate(path);
}

function findFile(path, searchFile, callback){
    var pi=new PathIterator();
    pi.on('file', function(fpath, stats){
        if (fpath.indexOf(searchFile)>-1){
            callback(undefined, fpath);
        }
    });
    pi.on('error', callback);
    pi.iterate(path);
}

var async = require('asyncjs');
function findFile(path, searchFile, callback) {
  async.readdir(path)
    .stat()
    .filter(function(file) {
      return file.stat == searchFile;
    })
    .toString(callback);
}

var async = require('asyncjs');
function findFile(path, searchFile, callback){
    async.walkfiles(path, undefined, async.POSTORDER)
        .stat()
        .each(function (file){
            if (file.name == searchFile){
                callback(file);
            }
        })
        .end();
}