maintenance/cleanupEmptyCategories.php

   1 <?php
   2 /**
   3  * Clean up empty categories in the category table.
   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 Maintenance
  22  */
  23
  24 require_once __DIR__ . '/Maintenance.php';
  25
  26 /**
  27  * Maintenance script to clean up empty categories in the category table.
  28  *
  29  * @ingroup Maintenance
  30  * @since 1.28
  31  */
  32 class CleanupEmptyCategories extends LoggedUpdateMaintenance {
  33
  34         public function __construct() {
  35                 parent::__construct();
  36                 $this->addDescription(
  37                         <<<TEXT
  38 This script will clean up the category table by removing entries for empty
  39 categories without a description page and adding entries for empty categories
  40 with a description page. It will print out progress indicators every batch. The
  41 script is perfectly safe to run on large, live wikis, and running it multiple
  42 times is harmless. You may want to use the throttling options if it's causing
  43 too much load; they will not affect correctness.
  44
  45 If the script is stopped and later resumed, you can use the --mode and --begin
  46 options with the last printed progress indicator to pick up where you left off.
  47
  48 When the script has finished, it will make a note of this in the database, and
  49 will not run again without the --force option.
  50 TEXT
  51                 );
  52
  53                 $this->addOption(
  54                         'mode',
  55                         '"add" empty categories with description pages, "remove" empty categories '
  56                         . 'without description pages, or "both"',
  57                         false,
  58                         true
  59                 );
  60                 $this->addOption(
  61                         'begin',
  62                         'Only do categories whose names are alphabetically after the provided name',
  63                         false,
  64                         true
  65                 );
  66                 $this->addOption(
  67                         'throttle',
  68                         'Wait this many milliseconds after each batch. Default: 0',
  69                         false,
  70                         true
  71                 );
  72         }
  73
  74         protected function getUpdateKey() {
  75                 return 'cleanup empty categories';
  76         }
  77
  78         protected function doDBUpdates() {
  79                 $mode = $this->getOption( 'mode', 'both' );
  80                 $begin = $this->getOption( 'begin', '' );
  81                 $throttle = $this->getOption( 'throttle', 0 );
  82
  83                 if ( !in_array( $mode, [ 'add', 'remove', 'both' ] ) ) {
  84                         $this->output( "--mode must be 'add', 'remove', or 'both'.\n" );
  85                         return false;
  86                 }
  87
  88                 $dbw = $this->getDB( DB_MASTER );
  89
  90                 $throttle = intval( $throttle );
  91
  92                 if ( $mode === 'add' || $mode === 'both' ) {
  93                         if ( $begin !== '' ) {
  94                                 $where = [ 'page_title > ' . $dbw->addQuotes( $begin ) ];
  95                         } else {
  96                                 $where = [];
  97                         }
  98
  99                         $this->output( "Adding empty categories with description pages...\n" );
 100                         while ( true ) {
 101                                 # Find which category to update
 102                                 $rows = $dbw->select(
 103                                         [ 'page', 'category' ],
 104                                         'page_title',
 105                                         array_merge( $where, [
 106                                                 'page_namespace' => NS_CATEGORY,
 107                                                 'cat_title' => null,
 108                                         ] ),
 109                                         __METHOD__,
 110                                         [
 111                                                 'ORDER BY' => 'page_title',
 112                                                 'LIMIT' => $this->mBatchSize,
 113                                         ],
 114                                         [
 115                                                 'category' => [ 'LEFT JOIN', 'page_title = cat_title' ],
 116                                         ]
 117                                 );
 118                                 if ( !$rows || $rows->numRows() <= 0 ) {
 119                                         # Done, hopefully.
 120                                         break;
 121                                 }
 122
 123                                 foreach ( $rows as $row ) {
 124                                         $name = $row->page_title;
 125                                         $where = [ 'page_title > ' . $dbw->addQuotes( $name ) ];
 126
 127                                         # Use the row to update the category count
 128                                         $cat = Category::newFromName( $name );
 129                                         if ( !is_object( $cat ) ) {
 130                                                 $this->output( "The category named $name is not valid?!\n" );
 131                                         } else {
 132                                                 $cat->refreshCounts();
 133                                         }
 134                                 }
 135                                 $this->output( "--mode=$mode --begin=$name\n" );
 136
 137                                 wfWaitForSlaves();
 138                                 usleep( $throttle * 1000 );
 139                         }
 140
 141                         $begin = '';
 142                 }
 143
 144                 if ( $mode === 'remove' || $mode === 'both' ) {
 145                         if ( $begin !== '' ) {
 146                                 $where = [ 'cat_title > ' . $dbw->addQuotes( $begin ) ];
 147                         } else {
 148                                 $where = [];
 149                         }
 150
 151                         $this->output( "Removing empty categories without description pages...\n" );
 152                         while ( true ) {
 153                                 # Find which category to update
 154                                 $rows = $dbw->select(
 155                                         [ 'category', 'page' ],
 156                                         'cat_title',
 157                                         array_merge( $where, [
 158                                                 'page_title' => null,
 159                                                 'cat_pages' => 0,
 160                                         ] ),
 161                                         __METHOD__,
 162                                         [
 163                                                 'ORDER BY' => 'cat_title',
 164                                                 'LIMIT' => $this->mBatchSize,
 165                                         ],
 166                                         [
 167                                                 'page' => [ 'LEFT JOIN', [
 168                                                         'page_namespace' => NS_CATEGORY, 'page_title = cat_title'
 169                                                 ] ],
 170                                         ]
 171                                 );
 172                                 if ( !$rows || $rows->numRows() <= 0 ) {
 173                                         # Done, hopefully.
 174                                         break;
 175                                 }
 176                                 foreach ( $rows as $row ) {
 177                                         $name = $row->cat_title;
 178                                         $where = [ 'cat_title > ' . $dbw->addQuotes( $name ) ];
 179
 180                                         # Use the row to update the category count
 181                                         $cat = Category::newFromName( $name );
 182                                         if ( !is_object( $cat ) ) {
 183                                                 $this->output( "The category named $name is not valid?!\n" );
 184                                         } else {
 185                                                 $cat->refreshCounts();
 186                                         }
 187                                 }
 188
 189                                 $this->output( "--mode=remove --begin=$name\n" );
 190
 191                                 wfWaitForSlaves();
 192                                 usleep( $throttle * 1000 );
 193                         }
 194                 }
 195
 196                 $this->output( "Category cleanup complete.\n" );
 197
 198                 return true;
 199         }
 200 }
 201
 202 $maintClass = 'CleanupEmptyCategories';
 203 require_once RUN_MAINTENANCE_IF_MAIN;