Zeno Zeng zenozeng

	var cp = require('child_process');

	module.exports = function(dir, callback) {
	// Note: don't use string to concat json, for commit subject may contain ' or "
	var sep = "<_______GITLOG COMMITS START_________>";
	var pretty = sep + ["%s", "%an", "%ae", "%ai"].join('%n');
	var gitlog = cp.spawn('git', ['log', '--pretty=' + pretty, '--name-only'], {cwd: dir});

	var stdout = '',
	stderr = '';

	var watch = require('node-watch'),
	exec = require('child_process').exec;

	watch('.', { recursive: true, followSymLinks: true }, function(filename) {
	if(filename === "build.js") return;
	console.log(filename, ' changed.');
	exec('./build.sh', function(error, stdout, stderr) {
	if(stdout) console.log('stdout: ' + stdout);
	if(stderr) console.log('stderr: ' + stderr);
	if (error !== null) {

	// Sort by fitness
	// JSON.stringify([[5, 3], [2, "string"], [4, 1]].sort())
	// "[[2,"string"],[4,1],[5,3]]"
	// `a` and `b` are sorted by `a.toString()` - `b.toString()`
	// See also: http://www.ecma-international.org/ecma-262/5.1/#sec-15.4.4.11
	// 所以是不靠谱的：
	// ["190", (2000000000000000000000000).toString(), (1000000000000000000000000000000000000).toString()].sort()
	// ["190", "1e+36", "2e+24"]

	this.population = this.population.map(function(individual) {