Grunt task to bump Testflight build number for Titanium projects

gistfile1.js

//load tiapp.xml in grunt config
grunt.initConfig({
    // This line makes your node configurations available for use
    pkg: grunt.file.readJSON('package.json'),
    tiapp: require('tiapp.xml').load('./tiapp.xml'),
    //...
//...........
grunt.registerTask('buildbump', function() {
    console.log('be sure to check that "ios.skipAppIdValidation" is set to true \n\n ti config ios.skipAppIdValidation true\n');
    var tiapp = grunt.config.data.tiapp;
    var current = tiapp.version;
    var newVersion;
    if (current.split('.').length === 3) {
      newVersion = current + '.0';
    } else if (current.split('.').length === 4) {
      var oldVal = current.split('.').pop();
      oldVal = parseInt(oldVal, 10);
      var newVal = oldVal + 1;
      newVersion = current.split('.');
      newVersion.splice(3, 1);
      newVersion = newVersion.join('.');
      newVersion += '.' + newVal;
    }
    console.log('bump from', current, 'to', newVersion);
    tiapp.version = newVersion;
    tiapp.write();
    grunt.config.set('tiapp', tiapp);
  });