Simple Node.js recursivily copy/rename files with specific pattern

copyFiles.js

/**
 * Simple Node.js recursivily copy/rename files with specific pattern
 * @license WTFPL
 * @usage $ node copyFiles.js
 */
var fs = require('fs'),
    config;

// config options
config = {
	targetDir: '/var/www/static/tmpl',
	removeFiles: true,
	matchPattern: /^[_](.*)/gi,
	replacePattern: '$1',
	files: [
		'_mytmpl.html',
        	'_mytmpl2.html'
	]
};

function walk(dir, done) {
  var results = [];
  fs.readdir(dir, function(err, list) {
    if (err) return done(err);
    var i = 0;
    (function next() {
      var file = list[i++];
      if (!file) return done(null, results);
      file = dir + '/' + file;
      fs.stat(file, function(err, stat) {
        if (stat && stat.isDirectory()) {
          walk(file, function(err, res) {
            results = results.concat(res);
            next();
          });
        } else {
          results.push(file);
          next();
        }
      });
    })();
  });
}

function copyFileSync(srcFile, destFile, encoding) {
  var content = fs.readFileSync(srcFile, encoding || 'utf8');
  fs.writeFileSync(destFile, content, encoding || 'utf8');
}

function removeFile(srcFile) {
	fs.unlinkSync(srcFile, function (err) {
	  if (err) throw err;
	  console.log('Successfully deleted: ' + srcFile);
	});
}

// walk the directory recursively
walk(config.targetDir, function(err, results) {
  	if (err) throw err;
  	var matchedFiles = [];

	results.forEach(function(file, i){
		var outputFile,
			targetFile = file.split('/').slice(-1)[0];

		if (config.files && config.files.indexOf(targetFile) !== -1) {
			// store it
			matchedFiles.push(file);
			outputFile = targetFile.replace(config.matchPattern, config.replacePattern);
			console.log('File matched: ' + targetFile);
			copyFileSync(file, file.replace(targetFile, outputFile));
		}
	});

	if (config.removeFiles) {
		console.log('\n----------------------------------------\n');
		matchedFiles.forEach(removeFile);
	}
});

Awesome code!! Saved my life