Node recursive file lister

app.js

// npm i walk --save

var walk    = require('walk'),
	fs      = require('fs'),
	path    = require('path'),
	util 	= require('util');

// We will list the content of the upper directory from where we are
var ROOT_PATH = path.normalize(path.join(__dirname, '../'));

// let's walk the path...
var walker  = walk.walk(ROOT_PATH, { 
	followLinks: false,
	filters: ["node_modules", 'pluralsight']
})

// Our resulting files object
var FILES = {}

// this method will create nested properties if the object does not have it, and push a value to an array:
// obj = {}
// keyPath = ['a', 'b', 'c']
// value = 'xxx'
// assign(obj, keyPath, value) => {a: b: c: ['xxx']}
// see http://stackoverflow.com/questions/5484673/javascript-how-to-dynamically-create-nested-objects-using-object-names-given-by
var assign = function(obj, keyPath, value) {
	lastKeyIndex = keyPath.length-1;
	for (var i = 0; i < lastKeyIndex; ++ i) {
		key = keyPath[i];
		if (!(key in obj))
			obj[key] = {}
		obj = obj[key];
	}
	if(obj[keyPath[lastKeyIndex]])
		obj[keyPath[lastKeyIndex]].push(value);
	else
		obj[keyPath[lastKeyIndex]] = [value];
}

var log = function(obj) {
	console.log(util.inspect(obj, false, null));
}

var fileHandler = function(root, stat, next) {
	var path = root.replace(ROOT_PATH, "/root").replace(/\\/g, '/').split('/')
	path.shift()
	assign(FILES, path, stat.name)
	next();
}

function endHandler() {
  console.log("all done");
  log(FILES);
}

walker.on("file", fileHandler);
walker.on("end", endHandler);