ListSort.php

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<?php
namespace Magento\Catalog\Model\Config\Source;

class ListSort implements \Magento\Framework\Option\ArrayInterface
{
    protected $_catalogConfig;

    public function __construct(\Magento\Catalog\Model\Config $catalogConfig)
    {
        $this->_catalogConfig = $catalogConfig;
    }

    public function toOptionArray()
    {
        $options = [];
        $options[] = ['label' => __('Position'), 'value' => 'position'];
        foreach ($this->_getCatalogConfig()->getAttributesUsedForSortBy() as $attribute) {
            $options[] = ['label' => __($attribute['frontend_label']), 'value' => $attribute['attribute_code']];
        }
        return $options;
    }

    protected function _getCatalogConfig()
    {
        return $this->_catalogConfig;
    }
}