think\Build::buildHello PHP Method

    protected static function buildHello($module, $namespace, $suffix = false)
    {
        $filename = APP_PATH . ($module ? $module . DS : '') . 'controller' . DS . 'Index' . ($suffix ? 'Controller' : '') . EXT;
        if (!is_file($filename)) {
            $content = file_get_contents(THINK_PATH . 'tpl' . DS . 'default_index.tpl');
            $content = str_replace(['{$app}', '{$module}', '{layer}', '{$suffix}'], [$namespace, $module ? $module . '\\' : '', 'controller', $suffix ? 'Controller' : ''], $content);
            if (!is_dir(dirname($filename))) {
                mkdir(dirname($filename), 0755, true);
            }
            file_put_contents($filename, $content);
        }
    }