includes/specials/SpecialWatchlist.php

   1 <?php
   2 /**
   3  * Implements Special:Watchlist
   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  * A special page that lists last changes made to the wiki,
  26  * limited to user-defined list of titles.
  27  *
  28  * @ingroup SpecialPage
  29  */
  30 class SpecialWatchlist extends ChangesListSpecialPage {
  31         public function __construct( $page = 'Watchlist', $restriction = 'viewmywatchlist' ) {
  32                 parent::__construct( $page, $restriction );
  33         }
  34
  35         public function doesWrites() {
  36                 return true;
  37         }
  38
  39         /**
  40          * Main execution point
  41          *
  42          * @param string $subpage
  43          */
  44         function execute( $subpage ) {
  45                 // Anons don't get a watchlist
  46                 $this->requireLogin( 'watchlistanontext' );
  47
  48                 $output = $this->getOutput();
  49                 $request = $this->getRequest();
  50                 $this->addHelpLink( 'Help:Watching pages' );
  51                 $output->addModules( [
  52                         'mediawiki.special.changeslist.visitedstatus',
  53                 ] );
  54
  55                 $mode = SpecialEditWatchlist::getMode( $request, $subpage );
  56                 if ( $mode !== false ) {
  57                         if ( $mode === SpecialEditWatchlist::EDIT_RAW ) {
  58                                 $title = SpecialPage::getTitleFor( 'EditWatchlist', 'raw' );
  59                         } elseif ( $mode === SpecialEditWatchlist::EDIT_CLEAR ) {
  60                                 $title = SpecialPage::getTitleFor( 'EditWatchlist', 'clear' );
  61                         } else {
  62                                 $title = SpecialPage::getTitleFor( 'EditWatchlist' );
  63                         }
  64
  65                         $output->redirect( $title->getLocalURL() );
  66
  67                         return;
  68                 }
  69
  70                 $this->checkPermissions();
  71
  72                 $user = $this->getUser();
  73                 $opts = $this->getOptions();
  74
  75                 $config = $this->getConfig();
  76                 if ( ( $config->get( 'EnotifWatchlist' ) || $config->get( 'ShowUpdatedMarker' ) )
  77                         && $request->getVal( 'reset' )
  78                         && $request->wasPosted()
  79                 ) {
  80                         $user->clearAllNotifications();
  81                         $output->redirect( $this->getPageTitle()->getFullURL( $opts->getChangedValues() ) );
  82
  83                         return;
  84                 }
  85
  86                 parent::execute( $subpage );
  87         }
  88
  89         /**
  90          * Return an array of subpages that this special page will accept.
  91          *
  92          * @see also SpecialEditWatchlist::getSubpagesForPrefixSearch
  93          * @return string[] subpages
  94          */
  95         public function getSubpagesForPrefixSearch() {
  96                 return [
  97                         'clear',
  98                         'edit',
  99                         'raw',
 100                 ];
 101         }
 102
 103         /**
 104          * Get a FormOptions object containing the default options
 105          *
 106          * @return FormOptions
 107          */
 108         public function getDefaultOptions() {
 109                 $opts = parent::getDefaultOptions();
 110                 $user = $this->getUser();
 111
 112                 $opts->add( 'days', $user->getOption( 'watchlistdays' ), FormOptions::FLOAT );
 113                 $opts->add( 'extended', $user->getBoolOption( 'extendwatchlist' ) );
 114                 if ( $this->getRequest()->getVal( 'action' ) == 'submit' ) {
 115                         // The user has submitted the form, so we dont need the default values
 116                         return $opts;
 117                 }
 118
 119                 $opts->add( 'hideminor', $user->getBoolOption( 'watchlisthideminor' ) );
 120                 $opts->add( 'hidebots', $user->getBoolOption( 'watchlisthidebots' ) );
 121                 $opts->add( 'hideanons', $user->getBoolOption( 'watchlisthideanons' ) );
 122                 $opts->add( 'hideliu', $user->getBoolOption( 'watchlisthideliu' ) );
 123                 $opts->add( 'hidepatrolled', $user->getBoolOption( 'watchlisthidepatrolled' ) );
 124                 $opts->add( 'hidemyself', $user->getBoolOption( 'watchlisthideown' ) );
 125                 $opts->add( 'hidecategorization', $user->getBoolOption( 'watchlisthidecategorization' ) );
 126
 127                 return $opts;
 128         }
 129
 130         /**
 131          * Get custom show/hide filters
 132          *
 133          * @return array Map of filter URL param names to properties (msg/default)
 134          */
 135         protected function getCustomFilters() {
 136                 if ( $this->customFilters === null ) {
 137                         $this->customFilters = parent::getCustomFilters();
 138                         Hooks::run( 'SpecialWatchlistFilters', [ $this, &$this->customFilters ], '1.23' );
 139                 }
 140
 141                 return $this->customFilters;
 142         }
 143
 144         /**
 145          * Fetch values for a FormOptions object from the WebRequest associated with this instance.
 146          *
 147          * Maps old pre-1.23 request parameters Watchlist used to use (different from Recentchanges' ones)
 148          * to the current ones.
 149          *
 150          * @param FormOptions $opts
 151          * @return FormOptions
 152          */
 153         protected function fetchOptionsFromRequest( $opts ) {
 154                 static $compatibilityMap = [
 155                         'hideMinor' => 'hideminor',
 156                         'hideBots' => 'hidebots',
 157                         'hideAnons' => 'hideanons',
 158                         'hideLiu' => 'hideliu',
 159                         'hidePatrolled' => 'hidepatrolled',
 160                         'hideOwn' => 'hidemyself',
 161                 ];
 162
 163                 $params = $this->getRequest()->getValues();
 164                 foreach ( $compatibilityMap as $from => $to ) {
 165                         if ( isset( $params[$from] ) ) {
 166                                 $params[$to] = $params[$from];
 167                                 unset( $params[$from] );
 168                         }
 169                 }
 170
 171                 // Not the prettiest way to achieve this… FormOptions internally depends on data sanitization
 172                 // methods defined on WebRequest and removing this dependency would cause some code duplication.
 173                 $request = new DerivativeRequest( $this->getRequest(), $params );
 174                 $opts->fetchValuesFromRequest( $request );
 175
 176                 return $opts;
 177         }
 178
 179         /**
 180          * Return an array of conditions depending of options set in $opts
 181          *
 182          * @param FormOptions $opts
 183          * @return array
 184          */
 185         public function buildMainQueryConds( FormOptions $opts ) {
 186                 $dbr = $this->getDB();
 187                 $conds = parent::buildMainQueryConds( $opts );
 188
 189                 // Calculate cutoff
 190                 if ( $opts['days'] > 0 ) {
 191                         $conds[] = 'rc_timestamp > ' .
 192                                 $dbr->addQuotes( $dbr->timestamp( time() - intval( $opts['days'] * 86400 ) ) );
 193                 }
 194
 195                 return $conds;
 196         }
 197
 198         /**
 199          * Process the query
 200          *
 201          * @param array $conds
 202          * @param FormOptions $opts
 203          * @return bool|ResultWrapper Result or false (for Recentchangeslinked only)
 204          */
 205         public function doMainQuery( $conds, $opts ) {
 206                 $dbr = $this->getDB();
 207                 $user = $this->getUser();
 208
 209                 # Toggle watchlist content (all recent edits or just the latest)
 210                 if ( $opts['extended'] ) {
 211                         $limitWatchlist = $user->getIntOption( 'wllimit' );
 212                         $usePage = false;
 213                 } else {
 214                         # Top log Ids for a page are not stored
 215                         $nonRevisionTypes = [ RC_LOG ];
 216                         Hooks::run( 'SpecialWatchlistGetNonRevisionTypes', [ &$nonRevisionTypes ] );
 217                         if ( $nonRevisionTypes ) {
 218                                 $conds[] = $dbr->makeList(
 219                                         [
 220                                                 'rc_this_oldid=page_latest',
 221                                                 'rc_type' => $nonRevisionTypes,
 222                                         ],
 223                                         LIST_OR
 224                                 );
 225                         }
 226                         $limitWatchlist = 0;
 227                         $usePage = true;
 228                 }
 229
 230                 $tables = [ 'recentchanges', 'watchlist' ];
 231                 $fields = RecentChange::selectFields();
 232                 $query_options = [ 'ORDER BY' => 'rc_timestamp DESC' ];
 233                 $join_conds = [
 234                         'watchlist' => [
 235                                 'INNER JOIN',
 236                                 [
 237                                         'wl_user' => $user->getId(),
 238                                         'wl_namespace=rc_namespace',
 239                                         'wl_title=rc_title'
 240                                 ],
 241                         ],
 242                 ];
 243
 244                 if ( $this->getConfig()->get( 'ShowUpdatedMarker' ) ) {
 245                         $fields[] = 'wl_notificationtimestamp';
 246                 }
 247                 if ( $limitWatchlist ) {
 248                         $query_options['LIMIT'] = $limitWatchlist;
 249                 }
 250
 251                 $rollbacker = $user->isAllowed( 'rollback' );
 252                 if ( $usePage || $rollbacker ) {
 253                         $tables[] = 'page';
 254                         $join_conds['page'] = [ 'LEFT JOIN', 'rc_cur_id=page_id' ];
 255                         if ( $rollbacker ) {
 256                                 $fields[] = 'page_latest';
 257                         }
 258                 }
 259
 260                 // Log entries with DELETED_ACTION must not show up unless the user has
 261                 // the necessary rights.
 262                 if ( !$user->isAllowed( 'deletedhistory' ) ) {
 263                         $bitmask = LogPage::DELETED_ACTION;
 264                 } elseif ( !$user->isAllowedAny( 'suppressrevision', 'viewsuppressed' ) ) {
 265                         $bitmask = LogPage::DELETED_ACTION | LogPage::DELETED_RESTRICTED;
 266                 } else {
 267                         $bitmask = 0;
 268                 }
 269                 if ( $bitmask ) {
 270                         $conds[] = $dbr->makeList( [
 271                                 'rc_type != ' . RC_LOG,
 272                                 $dbr->bitAnd( 'rc_deleted', $bitmask ) . " != $bitmask",
 273                         ], LIST_OR );
 274                 }
 275
 276                 ChangeTags::modifyDisplayQuery(
 277                         $tables,
 278                         $fields,
 279                         $conds,
 280                         $join_conds,
 281                         $query_options,
 282                         ''
 283                 );
 284
 285                 $this->runMainQueryHook( $tables, $fields, $conds, $query_options, $join_conds, $opts );
 286
 287                 return $dbr->select(
 288                         $tables,
 289                         $fields,
 290                         $conds,
 291                         __METHOD__,
 292                         $query_options,
 293                         $join_conds
 294                 );
 295         }
 296
 297         protected function runMainQueryHook( &$tables, &$fields, &$conds, &$query_options,
 298                 &$join_conds, $opts
 299         ) {
 300                 return parent::runMainQueryHook( $tables, $fields, $conds, $query_options, $join_conds, $opts )
 301                         && Hooks::run(
 302                                 'SpecialWatchlistQuery',
 303                                 [ &$conds, &$tables, &$join_conds, &$fields, $opts ],
 304                                 '1.23'
 305                         );
 306         }
 307
 308         /**
 309          * Return a IDatabase object for reading
 310          *
 311          * @return IDatabase
 312          */
 313         protected function getDB() {
 314                 return wfGetDB( DB_SLAVE, 'watchlist' );
 315         }
 316
 317         /**
 318          * Output feed links.
 319          */
 320         public function outputFeedLinks() {
 321                 $user = $this->getUser();
 322                 $wlToken = $user->getTokenFromOption( 'watchlisttoken' );
 323                 if ( $wlToken ) {
 324                         $this->addFeedLinks( [
 325                                 'action' => 'feedwatchlist',
 326                                 'allrev' => 1,
 327                                 'wlowner' => $user->getName(),
 328                                 'wltoken' => $wlToken,
 329                         ] );
 330                 }
 331         }
 332
 333         /**
 334          * Build and output the actual changes list.
 335          *
 336          * @param ResultWrapper $rows Database rows
 337          * @param FormOptions $opts
 338          */
 339         public function outputChangesList( $rows, $opts ) {
 340                 $dbr = $this->getDB();
 341                 $user = $this->getUser();
 342                 $output = $this->getOutput();
 343
 344                 # Show a message about slave lag, if applicable
 345                 $lag = wfGetLB()->safeGetLag( $dbr );
 346                 if ( $lag > 0 ) {
 347                         $output->showLagWarning( $lag );
 348                 }
 349
 350                 # If no rows to display, show message before try to render the list
 351                 if ( $rows->numRows() == 0 ) {
 352                         $output->wrapWikiMsg(
 353                                 "<div class='mw-changeslist-empty'>\n$1\n</div>", 'recentchanges-noresult'
 354                         );
 355                         return;
 356                 }
 357
 358                 $dbr->dataSeek( $rows, 0 );
 359
 360                 $list = ChangesList::newFromContext( $this->getContext() );
 361                 $list->setWatchlistDivs();
 362                 $list->initChangesListRows( $rows );
 363                 $dbr->dataSeek( $rows, 0 );
 364
 365                 if ( $this->getConfig()->get( 'RCShowWatchingUsers' )
 366                         && $user->getOption( 'shownumberswatching' )
 367                 ) {
 368                         $watchedItemStore = WatchedItemStore::getDefaultInstance();
 369                 }
 370
 371                 $s = $list->beginRecentChangesList();
 372                 $userShowHiddenCats = $this->getUser()->getBoolOption( 'showhiddencats' );
 373                 $counter = 1;
 374                 foreach ( $rows as $obj ) {
 375                         # Make RC entry
 376                         $rc = RecentChange::newFromRow( $obj );
 377
 378                         # Skip CatWatch entries for hidden cats based on user preference
 379                         if (
 380                                 $rc->getAttribute( 'rc_type' ) == RC_CATEGORIZE &&
 381                                 !$userShowHiddenCats &&
 382                                 $rc->getParam( 'hidden-cat' )
 383                         ) {
 384                                 continue;
 385                         }
 386
 387                         $rc->counter = $counter++;
 388
 389                         if ( $this->getConfig()->get( 'ShowUpdatedMarker' ) ) {
 390                                 $updated = $obj->wl_notificationtimestamp;
 391                         } else {
 392                                 $updated = false;
 393                         }
 394
 395                         if ( isset( $watchedItemStore ) ) {
 396                                 $rcTitleValue = new TitleValue( (int)$obj->rc_namespace, $obj->rc_title );
 397                                 $rc->numberofWatchingusers = $watchedItemStore->countWatchers( $rcTitleValue );
 398                         } else {
 399                                 $rc->numberofWatchingusers = 0;
 400                         }
 401
 402                         $changeLine = $list->recentChangesLine( $rc, $updated, $counter );
 403                         if ( $changeLine !== false ) {
 404                                 $s .= $changeLine;
 405                         }
 406                 }
 407                 $s .= $list->endRecentChangesList();
 408
 409                 $output->addHTML( $s );
 410         }
 411
 412         /**
 413          * Set the text to be displayed above the changes
 414          *
 415          * @param FormOptions $opts
 416          * @param int $numRows Number of rows in the result to show after this header
 417          */
 418         public function doHeader( $opts, $numRows ) {
 419                 $user = $this->getUser();
 420                 $out = $this->getOutput();
 421
 422                 // if the user wishes, that the watchlist is reloaded, whenever a filter changes,
 423                 // add the module for that
 424                 if ( $user->getBoolOption( 'watchlistreloadautomatically' ) ) {
 425                         $out->addModules( [ 'mediawiki.special.watchlist' ] );
 426                 }
 427
 428                 $out->addSubtitle(
 429                         $this->msg( 'watchlistfor2', $user->getName() )
 430                                 ->rawParams( SpecialEditWatchlist::buildTools( null ) )
 431                 );
 432
 433                 $this->setTopText( $opts );
 434
 435                 $lang = $this->getLanguage();
 436                 if ( $opts['days'] > 0 ) {
 437                         $days = $opts['days'];
 438                 } else {
 439                         $days = $this->getConfig()->get( 'RCMaxAge' ) / ( 3600 * 24 );
 440                 }
 441                 $timestamp = wfTimestampNow();
 442                 $wlInfo = $this->msg( 'wlnote' )->numParams( $numRows, round( $days * 24 ) )->params(
 443                         $lang->userDate( $timestamp, $user ), $lang->userTime( $timestamp, $user )
 444                 )->parse() . "<br />\n";
 445
 446                 $nondefaults = $opts->getChangedValues();
 447                 $cutofflinks = $this->msg( 'wlshowtime' ) . ' ' . $this->cutoffselector( $opts );
 448
 449                 # Spit out some control panel links
 450                 $filters = [
 451                         'hideminor' => 'wlshowhideminor',
 452                         'hidebots' => 'wlshowhidebots',
 453                         'hideanons' => 'wlshowhideanons',
 454                         'hideliu' => 'wlshowhideliu',
 455                         'hidemyself' => 'wlshowhidemine',
 456                         'hidepatrolled' => 'wlshowhidepatr'
 457                 ];
 458
 459                 if ( $this->getConfig()->get( 'RCWatchCategoryMembership' ) ) {
 460                         $filters['hidecategorization'] = 'wlshowhidecategorization';
 461                 }
 462
 463                 foreach ( $this->getCustomFilters() as $key => $params ) {
 464                         $filters[$key] = $params['msg'];
 465                 }
 466                 // Disable some if needed
 467                 if ( !$user->useRCPatrol() ) {
 468                         unset( $filters['hidepatrolled'] );
 469                 }
 470
 471                 $links = [];
 472                 foreach ( $filters as $name => $msg ) {
 473                         $links[] = $this->showHideCheck( $nondefaults, $msg, $name, $opts[$name] );
 474                 }
 475
 476                 $hiddenFields = $nondefaults;
 477                 $hiddenFields['action'] = 'submit';
 478                 unset( $hiddenFields['namespace'] );
 479                 unset( $hiddenFields['invert'] );
 480                 unset( $hiddenFields['associated'] );
 481                 unset( $hiddenFields['days'] );
 482                 foreach ( $filters as $key => $value ) {
 483                         unset( $hiddenFields[$key] );
 484                 }
 485
 486                 # Create output
 487                 $form = '';
 488
 489                 # Namespace filter and put the whole form together.
 490                 $form .= $wlInfo;
 491                 $form .= $cutofflinks;
 492                 $form .= $this->msg( 'watchlist-hide' ) .
 493                         $this->msg( 'colon-separator' )->escaped() .
 494                         implode( ' ', $links );
 495                 $form .= "\n<br />\n";
 496                 $form .= Html::namespaceSelector(
 497                         [
 498                                 'selected' => $opts['namespace'],
 499                                 'all' => '',
 500                                 'label' => $this->msg( 'namespace' )->text()
 501                         ], [
 502                                 'name' => 'namespace',
 503                                 'id' => 'namespace',
 504                                 'class' => 'namespaceselector',
 505                         ]
 506                 ) . "\n";
 507                 $form .= '<span class="mw-input-with-label">' . Xml::checkLabel(
 508                         $this->msg( 'invert' )->text(),
 509                         'invert',
 510                         'nsinvert',
 511                         $opts['invert'],
 512                         [ 'title' => $this->msg( 'tooltip-invert' )->text() ]
 513                 ) . "</span>\n";
 514                 $form .= '<span class="mw-input-with-label">' . Xml::checkLabel(
 515                         $this->msg( 'namespace_association' )->text(),
 516                         'associated',
 517                         'nsassociated',
 518                         $opts['associated'],
 519                         [ 'title' => $this->msg( 'tooltip-namespace_association' )->text() ]
 520                 ) . "</span>\n";
 521                 $form .= Xml::submitButton( $this->msg( 'watchlist-submit' )->text() ) . "\n";
 522                 foreach ( $hiddenFields as $key => $value ) {
 523                         $form .= Html::hidden( $key, $value ) . "\n";
 524                 }
 525                 $form .= Xml::closeElement( 'fieldset' ) . "\n";
 526                 $form .= Xml::closeElement( 'form' ) . "\n";
 527                 $this->getOutput()->addHTML( $form );
 528
 529                 $this->setBottomText( $opts );
 530         }
 531
 532         function cutoffselector( $options ) {
 533                 // Cast everything to strings immediately, so that we know all of the values have the same
 534                 // precision, and can be compared with '==='. 2/24 has a few more decimal places than its
 535                 // default string representation, for example, and would confuse comparisons.
 536
 537                 // Misleadingly, the 'days' option supports hours too.
 538                 $days = array_map( 'strval', [ 1/24, 2/24, 6/24, 12/24, 1, 3, 7 ] );
 539
 540                 $userWatchlistOption = (string)$this->getUser()->getOption( 'watchlistdays' );
 541                 // add the user preference, if it isn't available already
 542                 if ( !in_array( $userWatchlistOption, $days ) && $userWatchlistOption !== '0' ) {
 543                         $days[] = $userWatchlistOption;
 544                 }
 545
 546                 $maxDays = (string)( $this->getConfig()->get( 'RCMaxAge' ) / ( 3600 * 24 ) );
 547                 // add the maximum possible value, if it isn't available already
 548                 if ( !in_array( $maxDays, $days ) ) {
 549                         $days[] = $maxDays;
 550                 }
 551
 552                 $selected = (string)$options['days'];
 553                 if ( $selected <= 0 ) {
 554                         $selected = $maxDays;
 555                 }
 556
 557                 // add the currently selected value, if it isn't available already
 558                 if ( !in_array( $selected, $days ) ) {
 559                         $days[] = $selected;
 560                 }
 561
 562                 $select = new XmlSelect( 'days', 'days', $selected );
 563
 564                 asort( $days );
 565                 foreach ( $days as $value ) {
 566                         if ( $value < 1 ) {
 567                                 $name = $this->msg( 'hours' )->numParams( $value * 24 )->text();
 568                         } else {
 569                                 $name = $this->msg( 'days' )->numParams( $value )->text();
 570                         }
 571                         $select->addOption( $name, $value );
 572                 }
 573
 574                 return $select->getHTML() . "\n<br />\n";
 575         }
 576
 577         function setTopText( FormOptions $opts ) {
 578                 $nondefaults = $opts->getChangedValues();
 579                 $form = "";
 580                 $user = $this->getUser();
 581
 582                 $numItems = $this->countItems();
 583                 $showUpdatedMarker = $this->getConfig()->get( 'ShowUpdatedMarker' );
 584
 585                 // Show watchlist header
 586                 $form .= "<p>";
 587                 if ( $numItems == 0 ) {
 588                         $form .= $this->msg( 'nowatchlist' )->parse() . "\n";
 589                 } else {
 590                         $form .= $this->msg( 'watchlist-details' )->numParams( $numItems )->parse() . "\n";
 591                         if ( $this->getConfig()->get( 'EnotifWatchlist' )
 592                                 && $user->getOption( 'enotifwatchlistpages' )
 593                         ) {
 594                                 $form .= $this->msg( 'wlheader-enotif' )->parse() . "\n";
 595                         }
 596                         if ( $showUpdatedMarker ) {
 597                                 $form .= $this->msg( 'wlheader-showupdated' )->parse() . "\n";
 598                         }
 599                 }
 600                 $form .= "</p>";
 601
 602                 if ( $numItems > 0 && $showUpdatedMarker ) {
 603                         $form .= Xml::openElement( 'form', [ 'method' => 'post',
 604                                 'action' => $this->getPageTitle()->getLocalURL(),
 605                                 'id' => 'mw-watchlist-resetbutton' ] ) . "\n" .
 606                         Xml::submitButton( $this->msg( 'enotif_reset' )->text(), [ 'name' => 'dummy' ] ) . "\n" .
 607                         Html::hidden( 'reset', 'all' ) . "\n";
 608                         foreach ( $nondefaults as $key => $value ) {
 609                                 $form .= Html::hidden( $key, $value ) . "\n";
 610                         }
 611                         $form .= Xml::closeElement( 'form' ) . "\n";
 612                 }
 613
 614                 $form .= Xml::openElement( 'form', [
 615                         'method' => 'get',
 616                         'action' => $this->getPageTitle()->getLocalURL(),
 617                         'id' => 'mw-watchlist-form'
 618                 ] );
 619                 $form .= Xml::fieldset(
 620                         $this->msg( 'watchlist-options' )->text(),
 621                         false,
 622                         [ 'id' => 'mw-watchlist-options' ]
 623                 );
 624
 625                 $form .= $this->makeLegend();
 626
 627                 $this->getOutput()->addHTML( $form );
 628         }
 629
 630         protected function showHideCheck( $options, $message, $name, $value ) {
 631                 $options[$name] = 1 - (int)$value;
 632
 633                 return '<span class="mw-input-with-label">' . Xml::checkLabel(
 634                         $this->msg( $message, '' )->text(),
 635                         $name,
 636                         $name,
 637                         (int)$value
 638                 ) . '</span>';
 639         }
 640
 641         /**
 642          * Count the number of paired items on a user's watchlist.
 643          * The assumption made here is that when a subject page is watched a talk page is also watched.
 644          * Hence the number of individual items is halved.
 645          *
 646          * @return int
 647          */
 648         protected function countItems() {
 649                 $count = WatchedItemStore::getDefaultInstance()->countWatchedItems( $this->getUser() );
 650                 return floor( $count / 2 );
 651         }
 652 }