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 __construct( $name = 'Unusedcategories' ) {
  32                 parent::__construct( $name );
  33         }
  34
  35         function getPageHeader() {
  36                 return $this->msg( 'unusedcategoriestext' )->parseAsBlock();
  37         }
  38
  39         function getQueryInfo() {
  40                 return array (
  41                         'tables' => array ( 'page', 'categorylinks' ),
  42                         'fields' => array ( 'namespace' => 'page_namespace',
  43                                         'title' => 'page_title',
  44                                         'value' => 'page_title' ),
  45                         'conds' => array ( 'cl_from IS NULL',
  46                                         'page_namespace' => NS_CATEGORY,
  47                                         'page_is_redirect' => 0 ),
  48                         'join_conds' => array ( 'categorylinks' => array (
  49                                         'LEFT JOIN', 'cl_to = page_title' ) )
  50                 );
  51         }
  52
  53         /**
  54          * A should come before Z (bug 30907)
  55          * @return bool
  56          */
  57         function sortDescending() {
  58                 return false;
  59         }
  60
  61         function formatResult( $skin, $result ) {
  62                 $title = Title::makeTitle( NS_CATEGORY, $result->title );
  63                 return Linker::link( $title, htmlspecialchars( $title->getText() ) );
  64         }
  65 }