Create Magento extension xml with nodejs as a build process

magento-packager.js

var fs = require('fs'),
    path = require('path'),
    builder = require('xmlbuilder'),
    crypto = require('crypto');

var targetDir = process.argv[2] + '/',
    magentoVersion = process.argv[3];

function xmlAddSyncRecursive(xml, cpath, failSilent) {
    var files;
    try {
        files = fs.readdirSync(cpath);
    } catch (err) {
        if (failSilent) return;
        throw new Error(err.message);
    }

    for (var i = 0; i < files.length; i++) {
        var currFile = fs.lstatSync(path.join(cpath, files[i]));

        if (currFile.isDirectory()) {
            var dir = xml.ele('dir', {name: files[i]});
            xmlAddSyncRecursive(dir, path.join(cpath, files[i]));
        } else {
            xml.ele('file', {
                name: files[i],
                hash: crypto.createHash('md5').update(fs.readFileSync(path.join(cpath, files[i]), 'utf8')).digest('hex')
            });
        }
    }
    try {
        files = fs.readdirSync(cpath);
    } catch (err) {
        if (failSilent) return;
        throw new Error(err.message);
    }
    if (files.length == 0) {
        xml.remove();
        fs.rmdirSync(cpath);
    }
    return true;
};

var xml = builder.create('package');
xml.ele('name', null, 'Nextend');
xml.ele('version', null, magentoVersion);
xml.ele('stability', null, 'stable');
xml.ele('license', {uri: 'http://www.gnu.org/licenses/gpl-3.0.txt'}, 'GNU GENERAL PUBLIC LICENSE V3');
xml.ele('channel', null, 'community');
xml.ele('extends');
xml.ele('summary', null, '');
xml.ele('description', null, '');
xml.ele('notes', null, 'No notes');
var author = xml.ele('authors', null).ele('author', null);
author.ele('name', null, 'Nextendweb.com');
author.ele('user', null, 'nextendroland');
author.ele('email', null, '[email protected]');
xml.ele('date', null, '2015-08-01');
xml.ele('time', null, '00:00:00');
xml.ele('compatible');
var dependencies = xml.ele('dependencies');
var required = dependencies.ele('required');
var php = required.ele('php');
php.ele('min', null, '5.0.0');
php.ele('max', null, '8.0.0');

var contents = xml.ele('contents', null);
var mageetc = contents.ele('target', {name: 'mageetc'});
xmlAddSyncRecursive(mageetc, targetDir + 'app/etc/');

var magecommunity = contents.ele('target', {name: 'magecommunity'});
xmlAddSyncRecursive(magecommunity, targetDir + 'app/code/community/');

var magedesign = contents.ele('target', {name: 'magedesign'});
xmlAddSyncRecursive(magedesign, targetDir + 'app/design/');

var magemedia = contents.ele('target', {name: 'magemedia'});
xmlAddSyncRecursive(magemedia, targetDir + 'media/');

fs.writeFileSync(targetDir + 'package.xml', xml.end({pretty: true}), 'utf8');

Usage:
node magento-packager.js /path/to/extension 1.0.0