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 use MediaWiki\MediaWikiServices;
  25 use Wikimedia\Rdbms\ResultWrapper;
  26
  27 /**
  28  * A special page that lists last changes made to the wiki,
  29  * limited to user-defined list of titles.
  30  *
  31  * @ingroup SpecialPage
  32  */
  33 class SpecialWatchlist extends ChangesListSpecialPage {
  34         public function __construct( $page = 'Watchlist', $restriction = 'viewmywatchlist' ) {
  35                 parent::__construct( $page, $restriction );
  36         }
  37
  38         public function doesWrites() {
  39                 return true;
  40         }
  41
  42         /**
  43          * Main execution point
  44          *
  45          * @param string $subpage
  46          */
  47         function execute( $subpage ) {
  48                 // Anons don't get a watchlist
  49                 $this->requireLogin( 'watchlistanontext' );
  50
  51                 $output = $this->getOutput();
  52                 $request = $this->getRequest();
  53                 $this->addHelpLink( 'Help:Watching pages' );
  54                 $output->addModules( [
  55                         'mediawiki.special.changeslist.visitedstatus',
  56                         'mediawiki.special.watchlist',
  57                 ] );
  58
  59                 $mode = SpecialEditWatchlist::getMode( $request, $subpage );
  60                 if ( $mode !== false ) {
  61                         if ( $mode === SpecialEditWatchlist::EDIT_RAW ) {
  62                                 $title = SpecialPage::getTitleFor( 'EditWatchlist', 'raw' );
  63                         } elseif ( $mode === SpecialEditWatchlist::EDIT_CLEAR ) {
  64                                 $title = SpecialPage::getTitleFor( 'EditWatchlist', 'clear' );
  65                         } else {
  66                                 $title = SpecialPage::getTitleFor( 'EditWatchlist' );
  67                         }
  68
  69                         $output->redirect( $title->getLocalURL() );
  70
  71                         return;
  72                 }
  73
  74                 $this->checkPermissions();
  75
  76                 $user = $this->getUser();
  77                 $opts = $this->getOptions();
  78
  79                 $config = $this->getConfig();
  80                 if ( ( $config->get( 'EnotifWatchlist' ) || $config->get( 'ShowUpdatedMarker' ) )
  81                         && $request->getVal( 'reset' )
  82                         && $request->wasPosted()
  83                 ) {
  84                         $user->clearAllNotifications();
  85                         $output->redirect( $this->getPageTitle()->getFullURL( $opts->getChangedValues() ) );
  86
  87                         return;
  88                 }
  89
  90                 parent::execute( $subpage );
  91         }
  92
  93         /**
  94          * Return an array of subpages that this special page will accept.
  95          *
  96          * @see also SpecialEditWatchlist::getSubpagesForPrefixSearch
  97          * @return string[] subpages
  98          */
  99         public function getSubpagesForPrefixSearch() {
 100                 return [
 101                         'clear',
 102                         'edit',
 103                         'raw',
 104                 ];
 105         }
 106
 107         /**
 108          * Get a FormOptions object containing the default options
 109          *
 110          * @return FormOptions
 111          */
 112         public function getDefaultOptions() {
 113                 $opts = parent::getDefaultOptions();
 114                 $user = $this->getUser();
 115
 116                 $opts->add( 'days', $user->getOption( 'watchlistdays' ), FormOptions::FLOAT );
 117                 $opts->add( 'extended', $user->getBoolOption( 'extendwatchlist' ) );
 118                 if ( $this->getRequest()->getVal( 'action' ) == 'submit' ) {
 119                         // The user has submitted the form, so we dont need the default values
 120                         return $opts;
 121                 }
 122
 123                 $opts->add( 'hideminor', $user->getBoolOption( 'watchlisthideminor' ) );
 124                 $opts->add( 'hidebots', $user->getBoolOption( 'watchlisthidebots' ) );
 125                 $opts->add( 'hideanons', $user->getBoolOption( 'watchlisthideanons' ) );
 126                 $opts->add( 'hideliu', $user->getBoolOption( 'watchlisthideliu' ) );
 127                 $opts->add( 'hidepatrolled', $user->getBoolOption( 'watchlisthidepatrolled' ) );
 128                 $opts->add( 'hidemyself', $user->getBoolOption( 'watchlisthideown' ) );
 129                 $opts->add( 'hidecategorization', $user->getBoolOption( 'watchlisthidecategorization' ) );
 130
 131                 return $opts;
 132         }
 133
 134         /**
 135          * Get all custom filters
 136          *
 137          * @return array Map of filter URL param names to properties (msg/default)
 138          */
 139         protected function getCustomFilters() {
 140                 if ( $this->customFilters === null ) {
 141                         $this->customFilters = parent::getCustomFilters();
 142                         Hooks::run( 'SpecialWatchlistFilters', [ $this, &$this->customFilters ], '1.23' );
 143                 }
 144
 145                 return $this->customFilters;
 146         }
 147
 148         /**
 149          * Fetch values for a FormOptions object from the WebRequest associated with this instance.
 150          *
 151          * Maps old pre-1.23 request parameters Watchlist used to use (different from Recentchanges' ones)
 152          * to the current ones.
 153          *
 154          * @param FormOptions $opts
 155          * @return FormOptions
 156          */
 157         protected function fetchOptionsFromRequest( $opts ) {
 158                 static $compatibilityMap = [
 159                         'hideMinor' => 'hideminor',
 160                         'hideBots' => 'hidebots',
 161                         'hideAnons' => 'hideanons',
 162                         'hideLiu' => 'hideliu',
 163                         'hidePatrolled' => 'hidepatrolled',
 164                         'hideOwn' => 'hidemyself',
 165                 ];
 166
 167                 $params = $this->getRequest()->getValues();
 168                 foreach ( $compatibilityMap as $from => $to ) {
 169                         if ( isset( $params[$from] ) ) {
 170                                 $params[$to] = $params[$from];
 171                                 unset( $params[$from] );
 172                         }
 173                 }
 174
 175                 // Not the prettiest way to achieve this… FormOptions internally depends on data sanitization
 176                 // methods defined on WebRequest and removing this dependency would cause some code duplication.
 177                 $request = new DerivativeRequest( $this->getRequest(), $params );
 178                 $opts->fetchValuesFromRequest( $request );
 179
 180                 return $opts;
 181         }
 182
 183         /**
 184          * Return an array of conditions depending of options set in $opts
 185          *
 186          * @param FormOptions $opts
 187          * @return array
 188          */
 189         public function buildMainQueryConds( FormOptions $opts ) {
 190                 $dbr = $this->getDB();
 191                 $conds = parent::buildMainQueryConds( $opts );
 192
 193                 // Calculate cutoff
 194                 if ( $opts['days'] > 0 ) {
 195                         $conds[] = 'rc_timestamp > ' .
 196                                 $dbr->addQuotes( $dbr->timestamp( time() - intval( $opts['days'] * 86400 ) ) );
 197                 }
 198
 199                 return $conds;
 200         }
 201
 202         /**
 203          * Process the query
 204          *
 205          * @param array $conds
 206          * @param FormOptions $opts
 207          * @return bool|ResultWrapper Result or false (for Recentchangeslinked only)
 208          */
 209         public function doMainQuery( $conds, $opts ) {
 210                 $dbr = $this->getDB();
 211                 $user = $this->getUser();
 212
 213                 # Toggle watchlist content (all recent edits or just the latest)
 214                 if ( $opts['extended'] ) {
 215                         $limitWatchlist = $user->getIntOption( 'wllimit' );
 216                         $usePage = false;
 217                 } else {
 218                         # Top log Ids for a page are not stored
 219                         $nonRevisionTypes = [ RC_LOG ];
 220                         Hooks::run( 'SpecialWatchlistGetNonRevisionTypes', [ &$nonRevisionTypes ] );
 221                         if ( $nonRevisionTypes ) {
 222                                 $conds[] = $dbr->makeList(
 223                                         [
 224                                                 'rc_this_oldid=page_latest',
 225                                                 'rc_type' => $nonRevisionTypes,
 226                                         ],
 227                                         LIST_OR
 228                                 );
 229                         }
 230                         $limitWatchlist = 0;
 231                         $usePage = true;
 232                 }
 233
 234                 $tables = [ 'recentchanges', 'watchlist' ];
 235                 $fields = RecentChange::selectFields();
 236                 $query_options = [ 'ORDER BY' => 'rc_timestamp DESC' ];
 237                 $join_conds = [
 238                         'watchlist' => [
 239                                 'INNER JOIN',
 240                                 [
 241                                         'wl_user' => $user->getId(),
 242                                         'wl_namespace=rc_namespace',
 243                                         'wl_title=rc_title'
 244                                 ],
 245                         ],
 246                 ];
 247
 248                 if ( $this->getConfig()->get( 'ShowUpdatedMarker' ) ) {
 249                         $fields[] = 'wl_notificationtimestamp';
 250                 }
 251                 if ( $limitWatchlist ) {
 252                         $query_options['LIMIT'] = $limitWatchlist;
 253                 }
 254
 255                 $rollbacker = $user->isAllowed( 'rollback' );
 256                 if ( $usePage || $rollbacker ) {
 257                         $tables[] = 'page';
 258                         $join_conds['page'] = [ 'LEFT JOIN', 'rc_cur_id=page_id' ];
 259                         if ( $rollbacker ) {
 260                                 $fields[] = 'page_latest';
 261                         }
 262                 }
 263
 264                 // Log entries with DELETED_ACTION must not show up unless the user has
 265                 // the necessary rights.
 266                 if ( !$user->isAllowed( 'deletedhistory' ) ) {
 267                         $bitmask = LogPage::DELETED_ACTION;
 268                 } elseif ( !$user->isAllowedAny( 'suppressrevision', 'viewsuppressed' ) ) {
 269                         $bitmask = LogPage::DELETED_ACTION | LogPage::DELETED_RESTRICTED;
 270                 } else {
 271                         $bitmask = 0;
 272                 }
 273                 if ( $bitmask ) {
 274                         $conds[] = $dbr->makeList( [
 275                                 'rc_type != ' . RC_LOG,
 276                                 $dbr->bitAnd( 'rc_deleted', $bitmask ) . " != $bitmask",
 277                         ], LIST_OR );
 278                 }
 279
 280                 ChangeTags::modifyDisplayQuery(
 281                         $tables,
 282                         $fields,
 283                         $conds,
 284                         $join_conds,
 285                         $query_options,
 286                         ''
 287                 );
 288
 289                 $this->runMainQueryHook( $tables, $fields, $conds, $query_options, $join_conds, $opts );
 290
 291                 return $dbr->select(
 292                         $tables,
 293                         $fields,
 294                         $conds,
 295                         __METHOD__,
 296                         $query_options,
 297                         $join_conds
 298                 );
 299         }
 300
 301         protected function runMainQueryHook( &$tables, &$fields, &$conds, &$query_options,
 302                 &$join_conds, $opts
 303         ) {
 304                 return parent::runMainQueryHook( $tables, $fields, $conds, $query_options, $join_conds, $opts )
 305                         && Hooks::run(
 306                                 'SpecialWatchlistQuery',
 307                                 [ &$conds, &$tables, &$join_conds, &$fields, $opts ],
 308                                 '1.23'
 309                         );
 310         }
 311
 312         /**
 313          * Return a IDatabase object for reading
 314          *
 315          * @return IDatabase
 316          */
 317         protected function getDB() {
 318                 return wfGetDB( DB_REPLICA, 'watchlist' );
 319         }
 320
 321         /**
 322          * Output feed links.
 323          */
 324         public function outputFeedLinks() {
 325                 $user = $this->getUser();
 326                 $wlToken = $user->getTokenFromOption( 'watchlisttoken' );
 327                 if ( $wlToken ) {
 328                         $this->addFeedLinks( [
 329                                 'action' => 'feedwatchlist',
 330                                 'allrev' => 1,
 331                                 'wlowner' => $user->getName(),
 332                                 'wltoken' => $wlToken,
 333                         ] );
 334                 }
 335         }
 336
 337         /**
 338          * Build and output the actual changes list.
 339          *
 340          * @param ResultWrapper $rows Database rows
 341          * @param FormOptions $opts
 342          */
 343         public function outputChangesList( $rows, $opts ) {
 344                 $dbr = $this->getDB();
 345                 $user = $this->getUser();
 346                 $output = $this->getOutput();
 347
 348                 # Show a message about replica DB lag, if applicable
 349                 $lag = wfGetLB()->safeGetLag( $dbr );
 350                 if ( $lag > 0 ) {
 351                         $output->showLagWarning( $lag );
 352                 }
 353
 354                 # If no rows to display, show message before try to render the list
 355                 if ( $rows->numRows() == 0 ) {
 356                         $output->wrapWikiMsg(
 357                                 "<div class='mw-changeslist-empty'>\n$1\n</div>", 'recentchanges-noresult'
 358                         );
 359                         return;
 360                 }
 361
 362                 $dbr->dataSeek( $rows, 0 );
 363
 364                 $list = ChangesList::newFromContext( $this->getContext() );
 365                 $list->setWatchlistDivs();
 366                 $list->initChangesListRows( $rows );
 367                 $dbr->dataSeek( $rows, 0 );
 368
 369                 if ( $this->getConfig()->get( 'RCShowWatchingUsers' )
 370                         && $user->getOption( 'shownumberswatching' )
 371                 ) {
 372                         $watchedItemStore = MediaWikiServices::getInstance()->getWatchedItemStore();
 373                 }
 374
 375                 $s = $list->beginRecentChangesList();
 376                 $userShowHiddenCats = $this->getUser()->getBoolOption( 'showhiddencats' );
 377                 $counter = 1;
 378                 foreach ( $rows as $obj ) {
 379                         # Make RC entry
 380                         $rc = RecentChange::newFromRow( $obj );
 381
 382                         # Skip CatWatch entries for hidden cats based on user preference
 383                         if (
 384                                 $rc->getAttribute( 'rc_type' ) == RC_CATEGORIZE &&
 385                                 !$userShowHiddenCats &&
 386                                 $rc->getParam( 'hidden-cat' )
 387                         ) {
 388                                 continue;
 389                         }
 390
 391                         $rc->counter = $counter++;
 392
 393                         if ( $this->getConfig()->get( 'ShowUpdatedMarker' ) ) {
 394                                 $updated = $obj->wl_notificationtimestamp;
 395                         } else {
 396                                 $updated = false;
 397                         }
 398
 399                         if ( isset( $watchedItemStore ) ) {
 400                                 $rcTitleValue = new TitleValue( (int)$obj->rc_namespace, $obj->rc_title );
 401                                 $rc->numberofWatchingusers = $watchedItemStore->countWatchers( $rcTitleValue );
 402                         } else {
 403                                 $rc->numberofWatchingusers = 0;
 404                         }
 405
 406                         $changeLine = $list->recentChangesLine( $rc, $updated, $counter );
 407                         if ( $changeLine !== false ) {
 408                                 $s .= $changeLine;
 409                         }
 410                 }
 411                 $s .= $list->endRecentChangesList();
 412
 413                 $output->addHTML( $s );
 414         }
 415
 416         /**
 417          * Set the text to be displayed above the changes
 418          *
 419          * @param FormOptions $opts
 420          * @param int $numRows Number of rows in the result to show after this header
 421          */
 422         public function doHeader( $opts, $numRows ) {
 423                 $user = $this->getUser();
 424                 $out = $this->getOutput();
 425
 426                 $out->addSubtitle(
 427                         $this->msg( 'watchlistfor2', $user->getName() )
 428                                 ->rawParams( SpecialEditWatchlist::buildTools(
 429                                         $this->getLanguage(),
 430                                         $this->getLinkRenderer()
 431                                 ) )
 432                 );
 433
 434                 $this->setTopText( $opts );
 435
 436                 $lang = $this->getLanguage();
 437                 if ( $opts['days'] > 0 ) {
 438                         $days = $opts['days'];
 439                 } else {
 440                         $days = $this->getConfig()->get( 'RCMaxAge' ) / ( 3600 * 24 );
 441                 }
 442                 $timestamp = wfTimestampNow();
 443                 $wlInfo = $this->msg( 'wlnote' )->numParams( $numRows, round( $days * 24 ) )->params(
 444                         $lang->userDate( $timestamp, $user ), $lang->userTime( $timestamp, $user )
 445                 )->parse() . "<br />\n";
 446
 447                 $nondefaults = $opts->getChangedValues();
 448                 $cutofflinks = $this->msg( 'wlshowtime' ) . ' ' . $this->cutoffselector( $opts );
 449
 450                 # Spit out some control panel links
 451                 $filters = [
 452                         'hideminor' => 'wlshowhideminor',
 453                         'hidebots' => 'wlshowhidebots',
 454                         'hideanons' => 'wlshowhideanons',
 455                         'hideliu' => 'wlshowhideliu',
 456                         'hidemyself' => 'wlshowhidemine',
 457                         'hidepatrolled' => 'wlshowhidepatr'
 458                 ];
 459
 460                 if ( $this->getConfig()->get( 'RCWatchCategoryMembership' ) ) {
 461                         $filters['hidecategorization'] = 'wlshowhidecategorization';
 462                 }
 463
 464                 foreach ( $this->getRenderableCustomFilters( $this->getCustomFilters() ) as $key => $params ) {
 465                         $filters[$key] = $params['msg'];
 466                 }
 467
 468                 // Disable some if needed
 469                 if ( !$user->useRCPatrol() ) {
 470                         unset( $filters['hidepatrolled'] );
 471                 }
 472
 473                 $links = [];
 474                 foreach ( $filters as $name => $msg ) {
 475                         $links[] = $this->showHideCheck( $nondefaults, $msg, $name, $opts[$name] );
 476                 }
 477
 478                 $hiddenFields = $nondefaults;
 479                 $hiddenFields['action'] = 'submit';
 480                 unset( $hiddenFields['namespace'] );
 481                 unset( $hiddenFields['invert'] );
 482                 unset( $hiddenFields['associated'] );
 483                 unset( $hiddenFields['days'] );
 484                 foreach ( $filters as $key => $value ) {
 485                         unset( $hiddenFields[$key] );
 486                 }
 487
 488                 # Create output
 489                 $form = '';
 490
 491                 # Namespace filter and put the whole form together.
 492                 $form .= $wlInfo;
 493                 $form .= $cutofflinks;
 494                 $form .= $this->msg( 'watchlist-hide' ) .
 495                         $this->msg( 'colon-separator' )->escaped() .
 496                         implode( ' ', $links );
 497                 $form .= "\n<br />\n";
 498                 $form .= Html::namespaceSelector(
 499                         [
 500                                 'selected' => $opts['namespace'],
 501                                 'all' => '',
 502                                 'label' => $this->msg( 'namespace' )->text()
 503                         ], [
 504                                 'name' => 'namespace',
 505                                 'id' => 'namespace',
 506                                 'class' => 'namespaceselector',
 507                         ]
 508                 ) . "\n";
 509                 $form .= '<span class="mw-input-with-label">' . Xml::checkLabel(
 510                         $this->msg( 'invert' )->text(),
 511                         'invert',
 512                         'nsinvert',
 513                         $opts['invert'],
 514                         [ 'title' => $this->msg( 'tooltip-invert' )->text() ]
 515                 ) . "</span>\n";
 516                 $form .= '<span class="mw-input-with-label">' . Xml::checkLabel(
 517                         $this->msg( 'namespace_association' )->text(),
 518                         'associated',
 519                         'nsassociated',
 520                         $opts['associated'],
 521                         [ 'title' => $this->msg( 'tooltip-namespace_association' )->text() ]
 522                 ) . "</span>\n";
 523                 $form .= Xml::submitButton( $this->msg( 'watchlist-submit' )->text() ) . "\n";
 524                 foreach ( $hiddenFields as $key => $value ) {
 525                         $form .= Html::hidden( $key, $value ) . "\n";
 526                 }
 527                 $form .= Xml::closeElement( 'fieldset' ) . "\n";
 528                 $form .= Xml::closeElement( 'form' ) . "\n";
 529                 $this->getOutput()->addHTML( $form );
 530
 531                 $this->setBottomText( $opts );
 532         }
 533
 534         function cutoffselector( $options ) {
 535                 // Cast everything to strings immediately, so that we know all of the values have the same
 536                 // precision, and can be compared with '==='. 2/24 has a few more decimal places than its
 537                 // default string representation, for example, and would confuse comparisons.
 538
 539                 // Misleadingly, the 'days' option supports hours too.
 540                 $days = array_map( 'strval', [ 1/24, 2/24, 6/24, 12/24, 1, 3, 7 ] );
 541
 542                 $userWatchlistOption = (string)$this->getUser()->getOption( 'watchlistdays' );
 543                 // add the user preference, if it isn't available already
 544                 if ( !in_array( $userWatchlistOption, $days ) && $userWatchlistOption !== '0' ) {
 545                         $days[] = $userWatchlistOption;
 546                 }
 547
 548                 $maxDays = (string)( $this->getConfig()->get( 'RCMaxAge' ) / ( 3600 * 24 ) );
 549                 // add the maximum possible value, if it isn't available already
 550                 if ( !in_array( $maxDays, $days ) ) {
 551                         $days[] = $maxDays;
 552                 }
 553
 554                 $selected = (string)$options['days'];
 555                 if ( $selected <= 0 ) {
 556                         $selected = $maxDays;
 557                 }
 558
 559                 // add the currently selected value, if it isn't available already
 560                 if ( !in_array( $selected, $days ) ) {
 561                         $days[] = $selected;
 562                 }
 563
 564                 $select = new XmlSelect( 'days', 'days', $selected );
 565
 566                 asort( $days );
 567                 foreach ( $days as $value ) {
 568                         if ( $value < 1 ) {
 569                                 $name = $this->msg( 'hours' )->numParams( $value * 24 )->text();
 570                         } else {
 571                                 $name = $this->msg( 'days' )->numParams( $value )->text();
 572                         }
 573                         $select->addOption( $name, $value );
 574                 }
 575
 576                 return $select->getHTML() . "\n<br />\n";
 577         }
 578
 579         function setTopText( FormOptions $opts ) {
 580                 $nondefaults = $opts->getChangedValues();
 581                 $form = "";
 582                 $user = $this->getUser();
 583
 584                 $numItems = $this->countItems();
 585                 $showUpdatedMarker = $this->getConfig()->get( 'ShowUpdatedMarker' );
 586
 587                 // Show watchlist header
 588                 $form .= "<p>";
 589                 if ( $numItems == 0 ) {
 590                         $form .= $this->msg( 'nowatchlist' )->parse() . "\n";
 591                 } else {
 592                         $form .= $this->msg( 'watchlist-details' )->numParams( $numItems )->parse() . "\n";
 593                         if ( $this->getConfig()->get( 'EnotifWatchlist' )
 594                                 && $user->getOption( 'enotifwatchlistpages' )
 595                         ) {
 596                                 $form .= $this->msg( 'wlheader-enotif' )->parse() . "\n";
 597                         }
 598                         if ( $showUpdatedMarker ) {
 599                                 $form .= $this->msg( 'wlheader-showupdated' )->parse() . "\n";
 600                         }
 601                 }
 602                 $form .= "</p>";
 603
 604                 if ( $numItems > 0 && $showUpdatedMarker ) {
 605                         $form .= Xml::openElement( 'form', [ 'method' => 'post',
 606                                 'action' => $this->getPageTitle()->getLocalURL(),
 607                                 'id' => 'mw-watchlist-resetbutton' ] ) . "\n" .
 608                         Xml::submitButton( $this->msg( 'enotif_reset' )->text(),
 609                                 [ 'name' => 'mw-watchlist-reset-submit' ] ) . "\n" .
 610                         Html::hidden( 'reset', 'all' ) . "\n";
 611                         foreach ( $nondefaults as $key => $value ) {
 612                                 $form .= Html::hidden( $key, $value ) . "\n";
 613                         }
 614                         $form .= Xml::closeElement( 'form' ) . "\n";
 615                 }
 616
 617                 $form .= Xml::openElement( 'form', [
 618                         'method' => 'get',
 619                         'action' => wfScript(),
 620                         'id' => 'mw-watchlist-form'
 621                 ] );
 622                 $form .= Html::hidden( 'title', $this->getPageTitle()->getPrefixedText() );
 623                 $form .= Xml::fieldset(
 624                         $this->msg( 'watchlist-options' )->text(),
 625                         false,
 626                         [ 'id' => 'mw-watchlist-options' ]
 627                 );
 628
 629                 $form .= $this->makeLegend();
 630
 631                 $this->getOutput()->addHTML( $form );
 632         }
 633
 634         protected function showHideCheck( $options, $message, $name, $value ) {
 635                 $options[$name] = 1 - (int)$value;
 636
 637                 return '<span class="mw-input-with-label">' . Xml::checkLabel(
 638                         $this->msg( $message, '' )->text(),
 639                         $name,
 640                         $name,
 641                         (int)$value
 642                 ) . '</span>';
 643         }
 644
 645         /**
 646          * Count the number of paired items on a user's watchlist.
 647          * The assumption made here is that when a subject page is watched a talk page is also watched.
 648          * Hence the number of individual items is halved.
 649          *
 650          * @return int
 651          */
 652         protected function countItems() {
 653                 $store = MediaWikiServices::getInstance()->getWatchedItemStore();
 654                 $count = $store->countWatchedItems( $this->getUser() );
 655                 return floor( $count / 2 );
 656         }
 657 }