TFS PowerTools undo unchanged files

grunt-tfpt-uu.js

var tfptPath = 'C:\\Program Files (x86)\\Microsoft Team Foundation Server 2013 Power Tools\\TFPT.EXE';
grunt.registerTask('tfpt-uu', 'Undo changes to unchanged files in the workspace (required TFs PowerTools 2013', function () {
  var fs = require('fs');

  var cb = this.async();

  fs.exists(tfptPath, function (exists) {
    if (!exists) {
      grunt.warn('TFS Power Tools are not installed, aborting...');
      cb();
      return;
    }

    var child = grunt.util.spawn({
      cmd: tfptPath,
      args: ['uu', '/recursive']
    }, function (err, result, code) {
      if (err) {
        grunt.fatal(err);
      }
      cb();
    });
    child.stdout.pipe(process.stdout);
    child.stderr.pipe(process.stderr);
  });
});