includes/specials/SpecialUnusedcategories.php

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