app.controllers.UserController.php

<?php

class UserController extends \BaseController {
  public function getLogin() {
    return 'I\'m in!';
  }
}

app.routes.php

<?php

Route::controller(
  'users',
  'UserController',
  [
    'getLogin' => 'user_login',
  ]
);

Route::get('/', function () {
  return Redirect::route('user_login');
});