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