SpecialListRedirects.php

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<?php
use Wikimedia\Rdbms\IResultWrapper;
use Wikimedia\Rdbms\IDatabase;

class SpecialListRedirects extends QueryPage {
    function __construct( $name = 'Listredirects' ) {
        parent::__construct( $name );
    }

    public function isExpensive() {
        return true;
    }

    function isSyndicated() {
        return false;
    }

    function sortDescending() {
        return false;
    }

    public function getQueryInfo() {
        return [
            'tables' => [ 'p1' => 'page', 'redirect', 'p2' => 'page' ],
            'fields' => [ 'namespace' => 'p1.page_namespace',
                'title' => 'p1.page_title',
                'value' => 'p1.page_title',
                'rd_namespace',
                'rd_title',
                'rd_fragment',
                'rd_interwiki',
                'redirid' => 'p2.page_id' ],
            'conds' => [ 'p1.page_is_redirect' => 1 ],
            'join_conds' => [ 'redirect' => [
                'LEFT JOIN', 'rd_from=p1.page_id' ],
                'p2' => [ 'LEFT JOIN', [
                    'p2.page_namespace=rd_namespace',
                    'p2.page_title=rd_title' ] ] ]
        ];
    }

    function getOrderFields() {
        return [ 'p1.page_namespace', 'p1.page_title' ];
    }

    function preprocessResults( $db, $res ) {
        if ( !$res->numRows() ) {
            return;
        }

        $batch = new LinkBatch;
        foreach ( $res as $row ) {
            $batch->add( $row->namespace, $row->title );
            $redirTarget = $this->getRedirectTarget( $row );
            if ( $redirTarget ) {
                $batch->addObj( $redirTarget );
            }
        }
        $batch->execute();

        // Back to start for display
        $res->seek( 0 );
    }

    protected function getRedirectTarget( $row ) {
        if ( isset( $row->rd_title ) ) {
            return Title::makeTitle( $row->rd_namespace,
                $row->rd_title, $row->rd_fragment,
                $row->rd_interwiki
            );
        } else {
            $title = Title::makeTitle( $row->namespace, $row->title );
            $article = WikiPage::factory( $title );

            return $article->getRedirectTarget();
        }
    }

    function formatResult( $skin, $result ) {
        $linkRenderer = $this->getLinkRenderer();
        # Make a link to the redirect itself
        $rd_title = Title::makeTitle( $result->namespace, $result->title );
        $rd_link = $linkRenderer->makeLink(
            $rd_title,
            null,
            [],
            [ 'redirect' => 'no' ]
        );

        # Find out where the redirect leads
        $target = $this->getRedirectTarget( $result );
        if ( $target ) {
            # Make a link to the destination page
            $lang = $this->getLanguage();
            $arr = $lang->getArrow() . $lang->getDirMark();
            $targetLink = $linkRenderer->makeLink( $target, $target->getFullText() );

            return "$rd_link $arr $targetLink";
        } else {
            return "<del>$rd_link</del>";
        }
    }

    public function execute( $par ) {
        $this->addHelpLink( 'Help:Redirects' );
        parent::execute( $par );
    }

    protected function getGroupName() {
        return 'pages';
    }
}