MinifyTemplates.php

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<?php
namespace Magento\Deploy\Service;

use Magento\Framework\View\Template\Html\MinifierInterface;
use Magento\Framework\App\Utility\Files;

class MinifyTemplates
{
    private $filesUtils;

    private $htmlMinifier;

    public function __construct(
        Files $filesUtils,
        MinifierInterface $htmlMinifier
    ) {
        $this->filesUtils = $filesUtils;
        $this->htmlMinifier = $htmlMinifier;
    }

    public function minifyTemplates()
    {
        $count = 0;
        foreach ($this->filesUtils->getPhtmlFiles(false, false) as $template) {
            $this->htmlMinifier->minify($template);
            $count++;
        }
        return $count;
    }
}