<?php

/*
 * This file is part of the symfony package.
 * (c) 2004-2006 Fabien Potencier <fabien.potencier@symfony-project.com>
 * 
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

/**
 * CacheHelper.
 *
 * @package    symfony
 * @subpackage helper
 * @author     Fabien Potencier <fabien.potencier@symfony-project.com>
 * @version    SVN: $Id$
 */

/* Usage

<?php if (!cache('name')): ?>

... HTML ...

  <?php cache_save() ?>
<?php endif; ?>

*/
function cache($name, $lifeTime = 86400)
{
  if (!sfConfig::get('sf_cache'))
  {
    return null;
  }

  $cache = sfContext::getInstance()->getViewCacheManager();

  if (sfConfig::get('symfony.cache.started'))
  {
    throw new sfCacheException('Cache already started.');
  }

  $data = $cache->start($name, $lifeTime);

  if (null === $data)
  {
    sfConfig::set('symfony.cache.started', true);
    sfConfig::set('symfony.cache.current_name', $name);

    return false;
  }
  else
  {
    echo $data;

    return true;
  }
}

function cache_save()
{
  if (!sfConfig::get('sf_cache'))
  {
    return null;
  }

  if (!sfConfig::get('symfony.cache.started'))
  {
    throw new sfCacheException('Cache not started.');
  }

  $data = sfContext::getInstance()->getViewCacheManager()->stop(sfConfig::get('symfony.cache.current_name', ''));

  sfConfig::set('symfony.cache.started', false);
  sfConfig::set('symfony.cache.current_name', null);

  echo $data;
}
