SpecialLonelyPages.php

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<?php
use MediaWiki\Cache\LinkBatchFactory;
use MediaWiki\Languages\LanguageConverterFactory;
use MediaWiki\Linker\LinksMigration;
use Wikimedia\Rdbms\ILoadBalancer;
 
class SpecialLonelyPages extends PageQueryPage {
 
    private $namespaceInfo;
 
    private $linksMigration;
 
    public function __construct(
        NamespaceInfo $namespaceInfo,
        ILoadBalancer $loadBalancer,
        LinkBatchFactory $linkBatchFactory,
        LanguageConverterFactory $languageConverterFactory,
        LinksMigration $linksMigration
    ) {
        parent::__construct( 'Lonelypages' );
        $this->namespaceInfo = $namespaceInfo;
        $this->setDBLoadBalancer( $loadBalancer );
        $this->setLinkBatchFactory( $linkBatchFactory );
        $this->setLanguageConverter( $languageConverterFactory->getLanguageConverter( $this->getContentLanguage() ) );
        $this->linksMigration = $linksMigration;
    }
 
    protected function getPageHeader() {
        return $this->msg( 'lonelypagestext' )->parseAsBlock();
    }
 
    protected function sortDescending() {
        return false;
    }
 
    public function isExpensive() {
        return true;
    }
 
    public function isSyndicated() {
        return false;
    }
 
    public function getQueryInfo() {
        $queryInfo = $this->linksMigration->getQueryInfo(
            'templatelinks',
            'templatelinks',
            'LEFT JOIN'
        );
        list( $ns, $title ) = $this->linksMigration->getTitleFields( 'templatelinks' );
        $tables = array_merge( [ 'page', 'pagelinks' ], $queryInfo['tables'] );
        $conds = [
            'pl_namespace IS NULL',
            'page_namespace' => $this->namespaceInfo->getContentNamespaces(),
            'page_is_redirect' => 0,
            'tl_from IS NULL'
        ];
        $joinConds = [
            'pagelinks' => [
                'LEFT JOIN', [
                    'pl_namespace = page_namespace',
                    'pl_title = page_title'
                ]
            ],
        ];
        $templatelinksJoin = [
            'LEFT JOIN', [
                "$ns = page_namespace",
                "$title = page_title"
            ]
        ];
        if ( in_array( 'linktarget', $tables ) ) {
            $joinConds['linktarget'] = $templatelinksJoin;
        } else {
            $joinConds['templatelinks'] = $templatelinksJoin;
        }
 
        // Allow extensions to modify the query
        $this->getHookRunner()->onLonelyPagesQuery( $tables, $conds, $joinConds );
 
        return [
            'tables' => $tables,
            'fields' => [
                'namespace' => 'page_namespace',
                'title' => 'page_title',
            ],
            'conds' => $conds,
            'join_conds' => array_merge( $joinConds, $queryInfo['joins'] )
        ];
    }
 
    protected function getOrderFields() {
        // For some crazy reason ordering by a constant
        // causes a filesort in MySQL 5
        if ( count( $this->namespaceInfo->getContentNamespaces() ) > 1 ) {
            return [ 'page_namespace', 'page_title' ];
        } else {
            return [ 'page_title' ];
        }
    }
 
    protected function getGroupName() {
        return 'maintenance';
    }
}