SpecialCategories.php

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<?php
class SpecialCategories extends SpecialPage {

        function __construct() {
                parent::__construct( 'Categories' );
        }

        function execute( $par ) {
                $this->setHeaders();
                $this->outputHeader();
                $this->getOutput()->allowClickjacking();

                $from = $this->getRequest()->getText( 'from', $par );

                $cap = new CategoryPager( $this->getContext(), $from );
                $cap->doQuery();

                $this->getOutput()->addHTML(
                        Html::openElement( 'div', array( 'class' => 'mw-spcontent' ) ) .
                        $this->msg( 'categoriespagetext', $cap->getNumRows() )->parseAsBlock() .
                        $cap->getStartForm( $from ) .
                        $cap->getNavigationBar() .
                        '<ul>' . $cap->getBody() . '</ul>' .
                        $cap->getNavigationBar() .
                        Html::closeElement( 'div' )
                );
        }
}

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

        function getQueryInfo() {
                return array(
                        'tables' => array( 'category' ),
                        'fields' => array( 'cat_title','cat_pages' ),
                        'conds' => array( 'cat_pages > 0' ),
                        'options' => array( 'USE INDEX' => 'cat_title' ),
                );
        }

        function getIndexField() {
#               return array( 'abc' => 'cat_title', 'count' => 'cat_pages' );
                return 'cat_title';
        }

        function getDefaultQuery() {
                parent::getDefaultQuery();
                unset( $this->mDefaultQuery['from'] );
                return $this->mDefaultQuery;
        }
#       protected function getOrderTypeMessages() {
#               return array( 'abc' => 'special-categories-sort-abc',
#                       'count' => 'special-categories-sort-count' );
#       }

        protected function getDefaultDirections() {
#               return array( 'abc' => false, 'count' => true );
                return false;
        }

        /* 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( Title::makeTitleSafe( NS_CATEGORY, $row->cat_title ) );
                }
                $batch->execute();
                $this->mResult->rewind();
                return parent::getBody();
        }

        function formatRow($result) {
                $title = Title::makeTitle( NS_CATEGORY, $result->cat_title );
                $titleText = Linker::link( $title, htmlspecialchars( $title->getText() ) );
                $count = $this->msg( 'nmembers' )->numParams( $result->cat_pages )->escaped();
                return Xml::tags( 'li', null, $this->getLanguage()->specialList( $titleText, $count ) ) . "\n";
        }

        public function getStartForm( $from ) {
                global $wgScript;

                return
                        Xml::tags( 'form', array( 'method' => 'get', 'action' => $wgScript ),
                                Html::hidden( 'title', $this->getTitle()->getPrefixedText() ) .
                                Xml::fieldset( $this->msg( 'categories' )->text(),
                                        Xml::inputLabel( $this->msg( 'categoriesfrom' )->text(),
                                                'from', 'from', 20, $from ) .
                                        ' ' .
                                        Xml::submitButton( $this->msg( 'allpagessubmit' )->text() ) ) );
        }
}