includes/specials/SpecialUnusedcategories.php

   1 <?php
   2 /**
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation; either version 2 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along
  15  * with this program; if not, write to the Free Software Foundation, Inc.,
  16  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  17  * http://www.gnu.org/copyleft/gpl.html
  18  */
  19
  20 /**
  21  * @file
  22  * @ingroup SpecialPage
  23  */
  24
  25 /**
  26  * @ingroup SpecialPage
  27  */
  28 class UnusedCategoriesPage extends QueryPage {
  29
  30         function isExpensive() { return true; }
  31
  32         function getName() {
  33                 return 'Unusedcategories';
  34         }
  35
  36         function getPageHeader() {
  37                 return wfMsgExt( 'unusedcategoriestext', array( 'parse' ) );
  38         }
  39
  40         function getSQL() {
  41                 $NScat = NS_CATEGORY;
  42                 $dbr = wfGetDB( DB_SLAVE );
  43                 list( $categorylinks, $page ) = $dbr->tableNamesN( 'categorylinks', 'page' );
  44                 return "SELECT 'Unusedcategories' as type,
  45                                 {$NScat} as namespace, page_title as title, page_title as value
  46                                 FROM $page
  47                                 LEFT JOIN $categorylinks ON page_title=cl_to
  48                                 WHERE cl_from IS NULL
  49                                 AND page_namespace = {$NScat}
  50                                 AND page_is_redirect = 0";
  51         }
  52
  53         function formatResult( $skin, $result ) {
  54                 $title = Title::makeTitle( NS_CATEGORY, $result->title );
  55                 return $skin->link( $title, $title->getText() );
  56         }
  57 }
  58
  59 /** constructor */
  60 function wfSpecialUnusedCategories() {
  61         list( $limit, $offset ) = wfCheckLimits();
  62         $uc = new UnusedCategoriesPage();
  63         return $uc->doQuery( $offset, $limit );
  64 }