CategoryPager.php

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<?php
use MediaWiki\Linker\LinkRenderer;

class CategoryPager extends AlphabeticPager {

    public function __construct( IContextSource $context, $from, LinkRenderer $linkRenderer
    ) {
        parent::__construct( $context, $linkRenderer );
        $from = str_replace( ' ', '_', $from );
        if ( $from !== '' ) {
            $from = Title::capitalize( $from, NS_CATEGORY );
            $this->setOffset( $from );
            $this->setIncludeOffset( true );
        }
    }

    function getQueryInfo() {
        return [
            'tables' => [ 'category' ],
            'fields' => [ 'cat_title', 'cat_pages' ],
            'options' => [ 'USE INDEX' => 'cat_title' ],
        ];
    }

    function getIndexField() {
        return 'cat_title';
    }

    function getDefaultQuery() {
        parent::getDefaultQuery();
        unset( $this->mDefaultQuery['from'] );

        return $this->mDefaultQuery;
    }

    /* Override getBody to apply LinksBatch on resultset before actually outputting anything. */
    public function getBody() {
        $batch = new LinkBatch;

        $this->mResult->rewind();

        foreach ( $this->mResult as $row ) {
            $batch->addObj( new TitleValue( NS_CATEGORY, $row->cat_title ) );
        }
        $batch->execute();
        $this->mResult->rewind();

        return parent::getBody();
    }

    function formatRow( $result ) {
        $title = new TitleValue( NS_CATEGORY, $result->cat_title );
        $text = $title->getText();
        $link = $this->getLinkRenderer()->makeLink( $title, $text );

        $count = $this->msg( 'nmembers' )->numParams( $result->cat_pages )->escaped();
        return Html::rawElement( 'li', null, $this->getLanguage()->specialList( $link, $count ) ) . "\n";
    }

    public function getStartForm( $from ) {
        $formDescriptor = [
            'from' => [
                'type' => 'title',
                'namespace' => NS_CATEGORY,
                'relative' => true,
                'label-message' => 'categoriesfrom',
                'name' => 'from',
                'id' => 'from',
                'size' => 20,
                'default' => $from,
            ],
        ];

        $htmlForm = HTMLForm::factory( 'ooui', $formDescriptor, $this->getContext() )
            ->setSubmitTextMsg( 'categories-submit' )
            ->setWrapperLegendMsg( 'categories' )
            ->setMethod( 'get' );
        return $htmlForm->prepareForm()->getHTML( false );
    }

}