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+<?php
+/**
+ * Implements Special:Lonelypaages
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ * http://www.gnu.org/copyleft/gpl.html
+ *
+ * @file
+ * @ingroup SpecialPage
+ */
+
+/**
+ * A special page looking for articles with no article linking to them,
+ * thus being lonely.
+ *
+ * @ingroup SpecialPage
+ */
+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 = [ 'page', 'pagelinks', 'templatelinks' ];
+ $conds = [
+ 'pl_namespace IS NULL',
+ 'page_namespace' => MWNamespace::getContentNamespaces(),
+ 'page_is_redirect' => 0,
+ 'tl_namespace IS NULL'
+ ];
+ $joinConds = [
+ 'pagelinks' => [
+ 'LEFT JOIN', [
+ 'pl_namespace = page_namespace',
+ 'pl_title = page_title'
+ ]
+ ],
+ 'templatelinks' => [
+ 'LEFT JOIN', [
+ 'tl_namespace = page_namespace',
+ 'tl_title = page_title'
+ ]
+ ]
+ ];
+
+ // Allow extensions to modify the query
+ Hooks::run( 'LonelyPagesQuery', [ &$tables, &$conds, &$joinConds ] );
+
+ return [
+ 'tables' => $tables,
+ 'fields' => [
+ '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 [ 'page_namespace', 'page_title' ];
+ } else {
+ return [ 'page_title' ];
+ }
+ }
+
+ protected function getGroupName() {
+ return 'maintenance';
+ }
+}