SpecialUnusedTemplates.php

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<?php
use MediaWiki\Linker\LinksMigration;
use Wikimedia\Rdbms\ILoadBalancer;
 
class SpecialUnusedTemplates extends QueryPage {
 
    private $linksMigration;
 
    public function __construct(
        ILoadBalancer $loadBalancer,
        LinksMigration $linksMigration
    ) {
        parent::__construct( 'Unusedtemplates' );
        $this->setDBLoadBalancer( $loadBalancer );
        $this->linksMigration = $linksMigration;
    }
 
    public function isExpensive() {
        return true;
    }
 
    public function isSyndicated() {
        return false;
    }
 
    protected function sortDescending() {
        return false;
    }
 
    protected function getOrderFields() {
        return [ 'title' ];
    }
 
    public function getQueryInfo() {
        $queryInfo = $this->linksMigration->getQueryInfo(
            'templatelinks',
            'templatelinks',
            'LEFT JOIN'
        );
        list( $ns, $title ) = $this->linksMigration->getTitleFields( 'templatelinks' );
        $joinConds = [];
        $templatelinksJoin = [
            'LEFT JOIN', [ "$title = page_title",
                "$ns = page_namespace" ] ];
        if ( in_array( 'linktarget', $queryInfo['tables'] ) ) {
            $joinConds['linktarget'] = $templatelinksJoin;
        } else {
            $joinConds['templatelinks'] = $templatelinksJoin;
        }
        return [
            'tables' => array_merge( $queryInfo['tables'], [ 'page' ] ),
            'fields' => [
                'namespace' => 'page_namespace',
                'title' => 'page_title',
            ],
            'conds' => [
                'page_namespace' => NS_TEMPLATE,
                'tl_from IS NULL',
                'page_is_redirect' => 0
            ],
            'join_conds' => array_merge( $joinConds, $queryInfo['joins'] )
        ];
    }
 
    public function preprocessResults( $db, $res ) {
        $this->executeLBFromResultWrapper( $res );
    }
 
    public function formatResult( $skin, $result ) {
        $linkRenderer = $this->getLinkRenderer();
        $title = Title::makeTitle( NS_TEMPLATE, $result->title );
        $pageLink = $linkRenderer->makeKnownLink(
            $title,
            null,
            [],
            [ 'redirect' => 'no' ]
        );
        $wlhLink = $linkRenderer->makeKnownLink(
            SpecialPage::getTitleFor( 'Whatlinkshere', $title->getPrefixedText() ),
            $this->msg( 'unusedtemplateswlh' )->text()
        );
 
        return $this->getLanguage()->specialList( $pageLink, $wlhLink );
    }
 
    protected function getPageHeader() {
        return $this->msg( 'unusedtemplatestext' )->parseAsBlock();
    }
 
    protected function getGroupName() {
        return 'maintenance';
    }
}