HistoryEntryViewHelper.php

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<?php
namespace TYPO3\CMS\Belog\ViewHelpers;

use TYPO3\CMS\Core\Utility\GeneralUtility;

class HistoryEntryViewHelper extends \TYPO3\CMS\Fluid\Core\ViewHelper\AbstractViewHelper {

    protected $historyEntryRepository;

    public function render($uid) {
        $historyEntry = $this->historyEntryRepository->findOneBySysLogUid($uid);
        if (!$historyEntry instanceof \TYPO3\CMS\Belog\Domain\Model\HistoryEntry) {
            return '';
        }
        $historyLabel = \TYPO3\CMS\Extbase\Utility\LocalizationUtility::translate(
            'changesInFields',
            $this->controllerContext->getRequest()->getControllerExtensionName(),
            array($historyEntry->getFieldlist())
        );
        $historyIcon = \TYPO3\CMS\Backend\Utility\IconUtility::getSpriteIcon('actions-document-history-open', array(
            'title' => \TYPO3\CMS\Extbase\Utility\LocalizationUtility::translate('showHistory', $this->controllerContext->getRequest()->getControllerExtensionName())
        ));
        $historyHref = GeneralUtility::getIndpEnv('TYPO3_SITE_URL') . 'typo3/' .
            \TYPO3\CMS\Backend\Utility\BackendUtility::getModuleUrl(
                'record_history',
                array(
                    'sh_uid' => $historyEntry->getUid(),
                    'returnUrl' => \TYPO3\CMS\Core\Utility\GeneralUtility::getIndpEnv('REQUEST_URI'),
                )
            );
        $historyLink = '<a href="' . htmlspecialchars($historyHref) . '">' . $historyIcon . '</a>';
        return $historyLabel . '&nbsp;' . $historyLink;
    }

}