Method doExecute

/**
 * Internal function to execute the command.
 *
 * @param   InputInterface   $input   The input to inject into the command.
 * @param   OutputInterface  $output  The output to inject into the command.
 *
 * @return  integer  The command exit code
 *
 * @since   4.0.0
 */
protected function doExecute(InputInterface $input, OutputInterface $output) : int
{
    $symfonyStyle = new SymfonyStyle($input, $output);
    $model = $this->getUpdateInfo();
    $data = $model->getUpdateInformation();
    $symfonyStyle->title('Joomla! Updates');
    if (!$data['hasUpdate']) {
        $symfonyStyle->success('You already have the latest Joomla version ' . $data['latest']);
        return Command::SUCCESS;
    }
    $symfonyStyle->note('New Joomla Version ' . $data['latest'] . ' is available.');
    if (!isset($data['object']->downloadurl->_data)) {
        $symfonyStyle->warning('We cannot find an update URL');
    }
    return Command::SUCCESS;
}