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        $this->assetCollector->addXmlFile($file);
        $iconIdentifier = $this->assetCollector->getIconIdentifierFromFileName($file);

        $fileAbsPath = GeneralUtility::getFileAbsFileName($file);
// early return if it seems that the file does not exist (is_file or file_exists, not sure here)
        if (!is_file($fileAbsPath)) {
            return '<!-- Please check path: ' . $file . ' -->';
        }
        $this->assetCollector->addXmlFile($fileAbsPath);
// feed in absolute path, to have same value as in AssetCollector Class
        $iconIdentifier = $this->assetCollector->getIconIdentifierFromFileName($fileAbsPath);

    public function getIconIdentifierFromFileName(string $xmlFile): string
    {
        // maybe other approach here for unique ID without messing up generated HTML to much
        $uniqueId = substr(sha1($xmlFile), 0, 8);
        return str_replace('.svg', '', basename($xmlFile)) . '-'. $uniqueId;
    }

    public function addXmlFile(string $xmlFile): void
    {
        // maybe security check, if file is in public path and a SVG file (is_file or file_exists, not sure here)
        if (file_exists($xmlFile)) {
            $this->xmlFiles[] = $xmlFile;
        } else {
            $xmlFile = preg_replace('/^\//', '', $xmlFile); // or: ltrim($xmlFile, '/');
            $this->xmlFiles[] = GeneralUtility::getFileAbsFileName($xmlFile);
        }
    }

        $GLOBALS['TYPO3_CONF_VARS']['SC_OPTIONS']['t3lib/class.t3lib_pagerenderer.php']['render-postProcess'][]
            = \B13\Assetcollector\Hooks\PageRenderer\PostProcessHook::class . '->execute';

<?php

declare(strict_types=1);

namespace B13\Assetcollector\Hooks\PageRenderer;

use B13\Assetcollector\AssetCollector;
use Psr\Http\Message\ServerRequestInterface;
use TYPO3\CMS\Core\Http\ApplicationType;
use TYPO3\CMS\Core\Page\PageRenderer;
use TYPO3\CMS\Core\Utility\GeneralUtility;
use TYPO3\CMS\Frontend\Controller\TypoScriptFrontendController;

/**
 * PostProcessHook, this is referenced in ext_localconf.php
 * and should be executed once after all page rendering
 */
class PostProcessHook
{
    /**
     * @param array $params  The already used JS and CSS files and the header and footer data
     * @param PageRenderer $pageRenderer  The back reference to the TYPO3\CMS\Core\Page\PageRenderer class
     */
    public function execute(array &$params, PageRenderer &$pageRenderer): void
    {
        if (!($GLOBALS['TYPO3_REQUEST'] ?? null) instanceof ServerRequestInterface ||
            !ApplicationType::fromRequest($GLOBALS['TYPO3_REQUEST'])->isFrontend()) {
            return;
        }

        $assetCollector = GeneralUtility::makeInstance(AssetCollector::class);
// seems always empty, solution will follow
//        $cached = $this->getTypoScriptFrontendController()->config['b13/assetcollector'] ?? [];
//        if (!empty($cached['xmlFiles'] ?? null) && is_array($cached['xmlFiles'])) {
//            $assetCollector->mergeXmlFiles($cached['xmlFiles']);
//        }
        $svgReferences = $assetCollector->buildInlineXmlTag();
        $pageRenderer->addFooterData('<!-- SVG asset renderer -->' . PHP_EOL . $svgReferences);
        // not working with INT objects...
        //  $params['bodyContent'] = $params['bodyContent'] . '<!-- SVG asset renderer -->' . PHP_EOL . $svgReferences;
    }
// not used, see WIP comment above
    protected function getTypoScriptFrontendController(): ?TypoScriptFrontendController
    {
        return $GLOBALS['TSFE'] ?? null;
    }
}