An asynchronous directory walk for targeting files.

followAsync.js

var fs = require("fs");
var path = require("path");

function asyncForEach (array, fun) {
    array.forEach(function (element) {
        process.nextTick(function () {
            fun(element);
        });
    });
}

function followAsync (start, fun) {
    (function async (trail) {
        fs.readdir(trail, function (err, found) {
            !err && asyncForEach(found, function (breadcrumb) {
                var next = path.join(trail, breadcrumb);
                fs.stat(next, function(err, stats) {
                    !err && stats.isDirectory() ?
                        async(next) : fun(breadcrumb, trail);
                });
            });
        });
    })(path.normalize(start));
}

follow(".", function (filename, trailname) {
   console.log("%s/%s", trailname, filename);
});