WikiCategoryPage.php

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<?php
use MediaWiki\Category\Category;
use MediaWiki\Deferred\DeferredUpdates;
use MediaWiki\MediaWikiServices;
 
class WikiCategoryPage extends WikiPage {
 
    public function hasViewableContent() {
        if ( parent::hasViewableContent() ) {
            return true;
        } else {
            $cat = Category::newFromTitle( $this->mTitle );
            // If any of these are not 0, then has members
            if ( $cat->getMemberCount()
                || $cat->getSubcatCount()
                || $cat->getFileCount()
            ) {
                return true;
            }
        }
        return false;
    }
 
    public function isHidden() {
        $pageId = $this->getTitle()->getArticleID();
        $pageProps = MediaWikiServices::getInstance()
            ->getPageProps()
            ->getProperties( $this->getTitle(), 'hiddencat' );
 
        return isset( $pageProps[$pageId] );
    }
 
    public function isExpectedUnusedCategory() {
        $pageId = $this->getTitle()->getArticleID();
        $pageProps = MediaWikiServices::getInstance()
            ->getPageProps()
            ->getProperties( $this->getTitle(), 'expectunusedcategory' );
 
        return isset( $pageProps[$pageId] );
    }
 
    public function doPurge() {
        if ( !parent::doPurge() ) {
            // Aborted by hook most likely
            return false;
        }
 
        $title = $this->mTitle;
        DeferredUpdates::addCallableUpdate(
            static function () use ( $title ) {
                $cat = Category::newFromTitle( $title );
                // If the category has less than 5000 pages, refresh the counts.
                // 5000 was chosen based on the discussion at T85696.
                $cat->refreshCountsIfSmall( 5000 );
            },
            // Explicitly PRESEND so that counts are correct before we try to
            // re-render the page on the next load so {{PAGESINCAT:...}} will
            // be using the correct new values, not the old ones.
            DeferredUpdates::PRESEND
        );
 
        return true;
    }
}