SpecialLonelypages.php

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<?php
class LonelyPagesPage extends PageQueryPage {
    function __construct( $name = 'Lonelypages' ) {
        parent::__construct( $name );
    }

    function getPageHeader() {
        return $this->msg( 'lonelypagestext' )->parseAsBlock();
    }

    function sortDescending() {
        return false;
    }

    function isExpensive() {
        return true;
    }

    function isSyndicated() {
        return false;
    }

    function getQueryInfo() {
        $tables = array( 'page', 'pagelinks', 'templatelinks' );
        $conds = array(
            'pl_namespace IS NULL',
            'page_namespace' => MWNamespace::getContentNamespaces(),
            'page_is_redirect' => 0,
            'tl_namespace IS NULL'
        );
        $joinConds = array(
            'pagelinks' => array(
                'LEFT JOIN', array(
                    'pl_namespace = page_namespace',
                    'pl_title = page_title'
                )
            ),
            'templatelinks' => array(
                'LEFT JOIN', array(
                    'tl_namespace = page_namespace',
                    'tl_title = page_title'
                )
            )
        );

        // Allow extensions to modify the query
        wfRunHooks( 'LonelyPagesQuery', array( &$tables, &$conds, &$joinConds ) );

        return array(
            'tables' => $tables,
            'fields' => array(
                'namespace' => 'page_namespace',
                'title' => 'page_title',
                'value' => 'page_title'
            ),
            'conds' => $conds,
            'join_conds' => $joinConds
        );
    }

    function getOrderFields() {
        // For some crazy reason ordering by a constant
        // causes a filesort in MySQL 5
        if ( count( MWNamespace::getContentNamespaces() ) > 1 ) {
            return array( 'page_namespace', 'page_title' );
        } else {
            return array( 'page_title' );
        }
    }

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