includes/SpecialRecentchanges.php

   1 <?php
   2 /**
   3  *
   4  * @package MediaWiki
   5  * @subpackage SpecialPage
   6  */
   7
   8 /**
   9  *
  10  */
  11 require_once( 'Feed.php' );
  12 require_once( 'ChangesList.php' );
  13 require_once( 'Revision.php' );
  14
  15 /**
  16  * Constructor
  17  */
  18 function wfSpecialRecentchanges( $par, $specialPage ) {
  19         global $wgUser, $wgOut, $wgRequest, $wgUseRCPatrol;
  20         global $wgRCShowWatchingUsers, $wgShowUpdatedMarker;
  21         $fname = 'wfSpecialRecentchanges';
  22
  23         # Get query parameters
  24         $feedFormat = $wgRequest->getVal( 'feed' );
  25
  26         $defaults = array(
  27         /* int  */ 'days' => $wgUser->getDefaultOption('rcdays'),
  28         /* int  */ 'limit' => $wgUser->getDefaultOption('rclimit'),
  29         /* bool */ 'hideminor' => false,
  30         /* bool */ 'hidebots' => true,
  31         /* bool */ 'hideliu' => false,
  32         /* bool */ 'hidepatrolled' => false,
  33         /* text */ 'from' => '',
  34         /* text */ 'namespace' => null,
  35         /* bool */ 'invert' => false,
  36         );
  37
  38         extract($defaults);
  39
  40
  41         $days = $wgUser->getOption( 'rcdays' );
  42         if ( !$days ) { $days = $defaults['days']; }
  43         $days = $wgRequest->getInt( 'days', $days );
  44
  45         $limit = $wgUser->getOption( 'rclimit' );
  46         if ( !$limit ) { $limit = $defaults['limit']; }
  47
  48         #       list( $limit, $offset ) = wfCheckLimits( 100, 'rclimit' );
  49         $limit = $wgRequest->getInt( 'limit', $limit );
  50
  51         /* order of selection: url > preferences > default */
  52         $hideminor = $wgRequest->getBool( 'hideminor', $wgUser->getOption( 'hideminor') ? true : $defaults['hideminor'] );
  53
  54
  55         # As a feed, use limited settings only
  56         if( $feedFormat ) {
  57                 global $wgFeedLimit;
  58                 if( $limit > $wgFeedLimit ) {
  59                         $options['limit'] = $wgFeedLimit;
  60                 }
  61
  62         } else {
  63
  64                 $namespace = $wgRequest->getIntOrNull( 'namespace' );
  65                 $invert = $wgRequest->getBool( 'invert', $defaults['invert'] );
  66                 $hidebots = $wgRequest->getBool( 'hidebots', $defaults['hidebots'] );
  67                 $hideliu = $wgRequest->getBool( 'hideliu', $defaults['hideliu'] );
  68                 $hidepatrolled = $wgRequest->getBool( 'hidepatrolled', $defaults['hidepatrolled'] );
  69                 $from = $wgRequest->getVal( 'from', $defaults['from'] );
  70
  71                 # Get query parameters from path
  72                 if( $par ) {
  73                         $bits = preg_split( '/\s*,\s*/', trim( $par ) );
  74                         foreach ( $bits as $bit ) {
  75                                 if ( 'hidebots' == $bit ) $hidebots = 1;
  76                                 if ( 'bots' == $bit ) $hidebots = 0;
  77                                 if ( 'hideminor' == $bit ) $hideminor = 1;
  78                                 if ( 'minor' == $bit ) $hideminor = 0;
  79                                 if ( 'hideliu' == $bit ) $hideliu = 1;
  80                                 if ( 'hidepatrolled' == $bit ) $hidepatrolled = 1;
  81
  82                                 if ( is_numeric( $bit ) ) {
  83                                         $limit = $bit;
  84                                 }
  85
  86                                 if ( preg_match( '/^limit=(\d+)$/', $bit, $m ) ) {
  87                                         $limit = $m[1];
  88                                 }
  89
  90                                 if ( preg_match( '/^days=(\d+)$/', $bit, $m ) ) {
  91                                         $days = $m[1];
  92                                 }
  93                         }
  94                 }
  95         }
  96
  97         if ( $limit < 0 || $limit > 5000 ) $limit = $defaults['limit'];
  98
  99
 100         # Database connection and caching
 101         $dbr =& wfGetDB( DB_SLAVE );
 102         extract( $dbr->tableNames( 'recentchanges', 'watchlist' ) );
 103
 104
 105         $cutoff_unixtime = time() - ( $days * 86400 );
 106         $cutoff_unixtime = $cutoff_unixtime - ($cutoff_unixtime % 86400);
 107         $cutoff = $dbr->timestamp( $cutoff_unixtime );
 108         if(preg_match('/^[0-9]{14}$/', $from) and $from > wfTimestamp(TS_MW,$cutoff)) {
 109                 $cutoff = $dbr->timestamp($from);
 110         } else {
 111                 $from = $defaults['from'];
 112         }
 113
 114         # 10 seconds server-side caching max
 115         $wgOut->setSquidMaxage( 10 );
 116
 117         # Get last modified date, for client caching
 118         # Don't use this if we are using the patrol feature, patrol changes don't update the timestamp
 119         $lastmod = $dbr->selectField( 'recentchanges', 'MAX(rc_timestamp)', false, $fname );
 120         if ( $feedFormat || !$wgUseRCPatrol ) {
 121                 if( $lastmod && $wgOut->checkLastModified( $lastmod ) ){
 122                         # Client cache fresh and headers sent, nothing more to do.
 123                         return;
 124                 }
 125         }
 126
 127         $hidem  = $hideminor ? 'AND rc_minor=0' : '';
 128         $hidem .= $hidebots ? ' AND rc_bot=0' : '';
 129         $hidem .= $hideliu ? ' AND rc_user=0' : '';
 130         $hidem .= $hidepatrolled ? ' AND rc_patrolled=0' : '';
 131         $hidem .= is_null( $namespace ) ?  '' : ' AND rc_namespace' . ($invert ? '!=' : '=') . $namespace;
 132
 133         // This is the big thing!
 134
 135         $uid = $wgUser->getID();
 136
 137         // Perform query
 138         $sql2 = "SELECT * FROM $recentchanges FORCE INDEX (rc_timestamp) " .
 139           ($uid ? "LEFT OUTER JOIN $watchlist ON wl_user={$uid} AND wl_title=rc_title AND wl_namespace=rc_namespace " : "") .
 140           "WHERE rc_timestamp > '{$cutoff}' {$hidem} " .
 141           "ORDER BY rc_timestamp DESC";
 142         $sql2 = $dbr->limitResult($sql2, $limit, 0);
 143         $res = $dbr->query( $sql2, $fname );
 144
 145         // Fetch results, prepare a batch link existence check query
 146         $rows = array();
 147         $batch = new LinkBatch;
 148         while( $row = $dbr->fetchObject( $res ) ){
 149                 $rows[] = $row;
 150                 if ( !$feedFormat ) {
 151                         // User page link
 152                         $title = Title::makeTitleSafe( NS_USER, $row->rc_user_text );
 153                         $batch->addObj( $title );
 154
 155                         // User talk
 156                         $title = Title::makeTitleSafe( NS_USER_TALK, $row->rc_user_text );
 157                         $batch->addObj( $title );
 158                 }
 159
 160         }
 161         $dbr->freeResult( $res );
 162
 163         if( $feedFormat ) {
 164                 rcOutputFeed( $rows, $feedFormat, $limit, $hideminor, $lastmod );
 165         } else {
 166
 167                 # Web output...
 168
 169                 // Run existence checks
 170                 $batch->execute();
 171
 172                 // Output header
 173                 if ( !$specialPage->including() ) {
 174                         $wgOut->addWikiText( wfMsgForContent( "recentchangestext" ) );
 175
 176                         // Dump everything here
 177                         $nondefaults = array();
 178
 179                         wfAppendToArrayIfNotDefault( 'days', $days, $defaults, $nondefaults);
 180                         wfAppendToArrayIfNotDefault( 'limit', $limit , $defaults, $nondefaults);
 181                         wfAppendToArrayIfNotDefault( 'hideminor', $hideminor, $defaults, $nondefaults);
 182                         wfAppendToArrayIfNotDefault( 'hidebots', $hidebots, $defaults, $nondefaults);
 183                         wfAppendToArrayIfNotDefault( 'hideliu', $hideliu, $defaults, $nondefaults);
 184                         wfAppendToArrayIfNotDefault( 'hidepatrolled', $hidepatrolled, $defaults, $nondefaults);
 185                         wfAppendToArrayIfNotDefault( 'from', $from, $defaults, $nondefaults);
 186                         wfAppendToArrayIfNotDefault( 'namespace', $namespace, $defaults, $nondefaults);
 187                         wfAppendToArrayIfNotDefault( 'invert', $invert, $defaults, $nondefaults);
 188
 189                         // Add end of the texts
 190                         $wgOut->addHTML( '<div class="rcoptions">' . rcOptionsPanel( $defaults, $nondefaults ) . "\n" );
 191                         $wgOut->addHTML( rcNamespaceForm( $namespace, $invert, $nondefaults) . '</div>'."\n");
 192                 }
 193
 194                 // And now for the content
 195                 $sk = $wgUser->getSkin();
 196                 $wgOut->setSyndicated( true );
 197
 198                 $list = ChangesList::newFromUser( $wgUser );
 199
 200                 $s = $list->beginRecentChangesList();
 201                 $counter = 1;
 202                 foreach( $rows as $obj ){
 203                         if( $limit == 0) {
 204                                 break;
 205                         }
 206
 207                         if ( ! ( $hideminor     && $obj->rc_minor     ) &&
 208                              ! ( $hidepatrolled && $obj->rc_patrolled ) ) {
 209                                 $rc = RecentChange::newFromRow( $obj );
 210                                 $rc->counter = $counter++;
 211
 212                                 if ($wgShowUpdatedMarker
 213                                         && !empty( $obj->wl_notificationtimestamp )
 214                                         && ($obj->rc_timestamp >= $obj->wl_notificationtimestamp)) {
 215                                                 $rc->notificationtimestamp = true;
 216                                 } else {
 217                                         $rc->notificationtimestamp = false;
 218                                 }
 219
 220                                 if ($wgRCShowWatchingUsers && $wgUser->getOption( 'shownumberswatching' )) {
 221                                         $sql3 = "SELECT COUNT(*) AS n FROM $watchlist WHERE wl_title='" . $dbr->strencode($obj->rc_title) ."' AND wl_namespace=$obj->rc_namespace" ;
 222                                         $res3 = $dbr->query( $sql3, 'wfSpecialRecentChanges');
 223                                         $x = $dbr->fetchObject( $res3 );
 224                                         $rc->numberofWatchingusers = $x->n;
 225                                 } else {
 226                                         $rc->numberofWatchingusers = 0;
 227                                 }
 228                                 $s .= $list->recentChangesLine( $rc, !empty( $obj->wl_user ) );
 229                                 --$limit;
 230                         }
 231                 }
 232                 $s .= $list->endRecentChangesList();
 233                 $wgOut->addHTML( $s );
 234         }
 235 }
 236
 237 function rcOutputFeed( $rows, $feedFormat, $limit, $hideminor, $lastmod ) {
 238         global $messageMemc, $wgDBname, $wgFeedCacheTimeout;
 239         global $wgFeedClasses, $wgTitle, $wgSitename, $wgContLanguageCode;
 240
 241         if( !isset( $wgFeedClasses[$feedFormat] ) ) {
 242                 wfHttpError( 500, "Internal Server Error", "Unsupported feed type." );
 243                 return false;
 244         }
 245
 246         $timekey = "$wgDBname:rcfeed:$feedFormat:timestamp";
 247         $key = "$wgDBname:rcfeed:$feedFormat:limit:$limit:minor:$hideminor";
 248
 249         $feedTitle = $wgSitename . ' - ' . wfMsgForContent( 'recentchanges' ) .
 250                 ' [' . $wgContLanguageCode . ']';
 251         $feed = new $wgFeedClasses[$feedFormat](
 252                 $feedTitle,
 253                 htmlspecialchars( wfMsgForContent( 'recentchangestext' ) ),
 254                 $wgTitle->getFullUrl() );
 255
 256         /**
 257          * Bumping around loading up diffs can be pretty slow, so where
 258          * possible we want to cache the feed output so the next visitor
 259          * gets it quick too.
 260          */
 261         $cachedFeed = false;
 262         if( ( $wgFeedCacheTimeout > 0 ) && ( $feedLastmod = $messageMemc->get( $timekey ) ) ) {
 263                 /**
 264                  * If the cached feed was rendered very recently, we may
 265                  * go ahead and use it even if there have been edits made
 266                  * since it was rendered. This keeps a swarm of requests
 267                  * from being too bad on a super-frequently edited wiki.
 268                  */
 269                 if( time() - wfTimestamp( TS_UNIX, $feedLastmod )
 270                                 < $wgFeedCacheTimeout
 271                         || wfTimestamp( TS_UNIX, $feedLastmod )
 272                                 > wfTimestamp( TS_UNIX, $lastmod ) ) {
 273                         wfDebug( "RC: loading feed from cache ($key; $feedLastmod; $lastmod)...\n" );
 274                         $cachedFeed = $messageMemc->get( $key );
 275                 } else {
 276                         wfDebug( "RC: cached feed timestamp check failed ($feedLastmod; $lastmod)\n" );
 277                 }
 278         }
 279         if( is_string( $cachedFeed ) ) {
 280                 wfDebug( "RC: Outputting cached feed\n" );
 281                 $feed->httpHeaders();
 282                 echo $cachedFeed;
 283         } else {
 284                 wfDebug( "RC: rendering new feed and caching it\n" );
 285                 ob_start();
 286                 rcDoOutputFeed( $rows, $feed );
 287                 $cachedFeed = ob_get_contents();
 288                 ob_end_flush();
 289
 290                 $expire = 3600 * 24; # One day
 291                 $messageMemc->set( $key, $cachedFeed );
 292                 $messageMemc->set( $timekey, wfTimestamp( TS_MW ), $expire );
 293         }
 294         return true;
 295 }
 296
 297 function rcDoOutputFeed( $rows, &$feed ) {
 298         global $wgSitename, $wgFeedClasses, $wgContLanguageCode;
 299         $fname = 'rcDoOutputFeed';
 300         wfProfileIn( $fname );
 301
 302         $feed->outHeader();
 303
 304         # Merge adjacent edits by one user
 305         $sorted = array();
 306         $n = 0;
 307         foreach( $rows as $obj ) {
 308                 if( $n > 0 &&
 309                         $obj->rc_namespace >= 0 &&
 310                         $obj->rc_cur_id == $sorted[$n-1]->rc_cur_id &&
 311                         $obj->rc_user_text == $sorted[$n-1]->rc_user_text ) {
 312                         $sorted[$n-1]->rc_last_oldid = $obj->rc_last_oldid;
 313                 } else {
 314                         $sorted[$n] = $obj;
 315                         $n++;
 316                 }
 317                 $first = false;
 318         }
 319
 320         foreach( $sorted as $obj ) {
 321                 $title = Title::makeTitle( $obj->rc_namespace, $obj->rc_title );
 322                 $talkpage = $title->getTalkPage();
 323                 $item = new FeedItem(
 324                         $title->getPrefixedText(),
 325                         rcFormatDiff( $obj ),
 326                         $title->getFullURL(),
 327                         $obj->rc_timestamp,
 328                         $obj->rc_user_text,
 329                         $talkpage->getFullURL()
 330                         );
 331                 $feed->outItem( $item );
 332         }
 333         $feed->outFooter();
 334         wfProfileOut( $fname );
 335 }
 336
 337 /**
 338  *
 339  */
 340 function rcCountLink( $lim, $d, $page='Recentchanges', $more='' ) {
 341         global $wgUser, $wgLang, $wgContLang;
 342         $sk = $wgUser->getSkin();
 343         $s = $sk->makeKnownLink( $wgContLang->specialPage( $page ),
 344           ($lim ? $wgLang->formatNum( "{$lim}" ) : wfMsg( 'recentchangesall' ) ), "{$more}" .
 345           ($d ? "days={$d}&" : '') . 'limit='.$lim );
 346         return $s;
 347 }
 348
 349 /**
 350  *
 351  */
 352 function rcDaysLink( $lim, $d, $page='Recentchanges', $more='' ) {
 353         global $wgUser, $wgLang, $wgContLang;
 354         $sk = $wgUser->getSkin();
 355         $s = $sk->makeKnownLink( $wgContLang->specialPage( $page ),
 356           ($d ? $wgLang->formatNum( "{$d}" ) : wfMsg( 'recentchangesall' ) ), $more.'days='.$d .
 357           ($lim ? '&limit='.$lim : '') );
 358         return $s;
 359 }
 360
 361 /**
 362  * Used by Recentchangeslinked
 363  */
 364 function rcDayLimitLinks( $days, $limit, $page='Recentchanges', $more='', $doall = false, $minorLink = '',
 365         $botLink = '', $liuLink = '', $patrLink = '' ) {
 366         if ($more != '') $more .= '&';
 367         $cl = rcCountLink( 50, $days, $page, $more ) . ' | ' .
 368           rcCountLink( 100, $days, $page, $more  ) . ' | ' .
 369           rcCountLink( 250, $days, $page, $more  ) . ' | ' .
 370           rcCountLink( 500, $days, $page, $more  ) .
 371           ( $doall ? ( ' | ' . rcCountLink( 0, $days, $page, $more ) ) : '' );
 372         $dl = rcDaysLink( $limit, 1, $page, $more  ) . ' | ' .
 373           rcDaysLink( $limit, 3, $page, $more  ) . ' | ' .
 374           rcDaysLink( $limit, 7, $page, $more  ) . ' | ' .
 375           rcDaysLink( $limit, 14, $page, $more  ) . ' | ' .
 376           rcDaysLink( $limit, 30, $page, $more  ) .
 377           ( $doall ? ( ' | ' . rcDaysLink( $limit, 0, $page, $more ) ) : '' );
 378         $shm = wfMsg( 'showhideminor', $minorLink, $botLink, $liuLink, $patrLink );
 379         $note = wfMsg( 'rclinks', $cl, $dl, $shm );
 380         return $note;
 381 }
 382
 383
 384 /**
 385  * Makes change an option link which carries all the other options
 386  */
 387 function makeOptionsLink( $title, $override, $options ) {
 388         global $wgUser, $wgLang, $wgContLang;
 389         $sk = $wgUser->getSkin();
 390         return $sk->makeKnownLink( $wgContLang->specialPage( 'Recentchanges' ),
 391                 $title, wfArrayToCGI( $override, $options ) );
 392 }
 393
 394 /**
 395  * Creates the options panel
 396  */
 397 function rcOptionsPanel( $defaults, $nondefaults ) {
 398         global $wgLang;
 399
 400         $options = $nondefaults + $defaults;
 401
 402         if( $options['from'] )
 403                 $note = wfMsg( 'rcnotefrom', $wgLang->formatNum( $options['limit'] ), $wgLang->timeanddate( $options['from'], true ) );
 404         else
 405                 $note = wfMsg( 'rcnote', $wgLang->formatNum( $options['limit'] ), $wgLang->formatNum( $options['days'] ) );
 406
 407         // limit links
 408         $cl = '';
 409         $options_limit = array(50, 100, 250, 500);
 410         $i = 0;
 411         while ( $i+1 < count($options_limit) ) {
 412                 $cl .=  makeOptionsLink( $options_limit[$i], array( 'limit' => $options_limit[$i] ), $nondefaults) . ' | ' ;
 413                 $i++;
 414         }
 415         $cl .=  makeOptionsLink( $options_limit[$i], array( 'limit' => $options_limit[$i] ), $nondefaults) ;
 416
 417         // day links, reset 'from' to none
 418         $dl = '';
 419         $options_days = array(1, 3, 7, 14, 30);
 420         $i = 0;
 421         while ( $i+1 < count($options_days) ) {
 422                 $dl .=  makeOptionsLink( $options_days[$i], array( 'days' => $options_days[$i], 'from' => '' ), $nondefaults) . ' | ' ;
 423                 $i++;
 424         }
 425         $dl .=  makeOptionsLink( $options_days[$i], array( 'days' => $options_days[$i], 'from' => '' ), $nondefaults) ;
 426
 427         // show/hide links
 428         $showhide = array( wfMsg( 'show' ), wfMsg( 'hide' ));
 429         $minorLink = makeOptionsLink( $showhide[1-$options['hideminor']],
 430                 array( 'hideminor' => 1-$options['hideminor'] ), $nondefaults);
 431         $botLink = makeOptionsLink( $showhide[1-$options['hidebots']],
 432                 array( 'hidebots' => 1-$options['hidebots'] ), $nondefaults);
 433         $liuLink   = makeOptionsLink( $showhide[1-$options['hideliu']],
 434                 array( 'hideliu' => 1-$options['hideliu'] ), $nondefaults);
 435         $patrLink  = makeOptionsLink( $showhide[1-$options['hidepatrolled']],
 436                 array( 'hidepatrolled' => 1-$options['hidepatrolled'] ), $nondefaults);
 437
 438         $hl = wfMsg( 'showhideminor', $minorLink, $botLink, $liuLink, $patrLink );
 439
 440         // show from this onward link
 441         $now = $wgLang->timeanddate( wfTimestampNow(), true );
 442         $tl =  makeOptionsLink( $now, array( 'from' => wfTimestampNow()), $nondefaults );
 443
 444         $rclinks = wfMsg( 'rclinks', $cl, $dl, $hl );
 445         $rclistfrom = wfMsg( 'rclistfrom', $tl );
 446         return "$note<br />$rclinks<br />$rclistfrom";
 447
 448 }
 449
 450 /**<F2>
 451  * Creates the choose namespace selection
 452  *
 453  * @access private
 454  *
 455  * @param mixed $namespace The key of the currently selected namespace, empty string
 456  *              if there is none
 457  * @param bool $invert Whether to invert the namespace selection
 458  * @param array $nondefaults An array of non default options to be remembered
 459  *
 460  * @return string
 461  */
 462 function rcNamespaceForm ( $namespace, $invert, $nondefaults ) {
 463         global $wgContLang, $wgScript;
 464         $t = Title::makeTitle( NS_SPECIAL, 'Recentchanges' );
 465
 466         $namespaceselect = HTMLnamespaceselector($namespace, '');
 467         $submitbutton = '<input type="submit" value="' . wfMsgHtml( 'allpagessubmit' ) . "\" />\n";
 468         $invertbox = "<input type='checkbox' name='invert' value='1' id='nsinvert'" . ( $invert ? ' checked="checked"' : '' ) . ' />';
 469
 470         $out = "<div class='namespacesettings'><form method='get' action='{$wgScript}'>\n";
 471
 472         foreach ( $nondefaults as $key => $value ) {
 473                 if ($key != 'namespace' && $key != 'invert')
 474                         $out .= wfElement('input', array( 'type' => 'hidden', 'name' => $key, 'value' => $value));
 475         }
 476
 477         $out .= '<input type="hidden" name="title" value="'.$t->getPrefixedText().'" />';
 478         $out .= "
 479 <div id='nsselect' class='recentchanges'>
 480         <label for='namespace'>" . wfMsgHtml('namespace') . "</label>
 481         {$namespaceselect}{$submitbutton}{$invertbox} <label for='nsinvert'>" . wfMsgHtml('invert') . "</label>\n</div>";
 482         $out .= '</form></div>';
 483         return $out;
 484 }
 485
 486
 487 /**
 488  * Format a diff for the newsfeed
 489  */
 490 function rcFormatDiff( $row ) {
 491         global $wgFeedDiffCutoff, $wgContLang;
 492         $fname = 'rcFormatDiff';
 493         wfProfileIn( $fname );
 494
 495         require_once( 'DifferenceEngine.php' );
 496         $completeText = '<p>' . htmlspecialchars( $row->rc_comment ) . "</p>\n";
 497
 498         if( $row->rc_namespace >= 0 ) {
 499                 if( $row->rc_last_oldid ) {
 500                         wfProfileIn( "$fname-dodiff" );
 501
 502                         $titleObj = Title::makeTitle( $row->rc_namespace, $row->rc_title );
 503                         $de = new DifferenceEngine( $titleObj, $row->rc_last_oldid, $row->rc_this_oldid );
 504                         $diffText = $de->getDiff( wfMsg( 'revisionasof', $wgContLang->timeanddate( $row->rc_timestamp ) ),
 505                                 wfMsg( 'currentrev' ) );
 506
 507                         if ( strlen( $diffText ) > $wgFeedDiffCutoff ) {
 508                                 // Omit large diffs
 509                                 $diffLink = $titleObj->escapeFullUrl(
 510                                         'diff=' . $row->rc_this_oldid .
 511                                         '&oldid=' . $row->rc_last_oldid );
 512                                 $diffText = '<a href="' .
 513                                         $diffLink .
 514                                         '">' .
 515                                         htmlspecialchars( wfMsgForContent( 'difference' ) ) .
 516                                         '</a>';
 517                         } elseif ( $diffText === false ) {
 518                                 // Error in diff engine, probably a missing revision
 519                                 $diffText = "<p>Can't load revision $row->rc_this_oldid</p>";
 520                         } else {
 521                                 // Diff output fine, clean up any illegal UTF-8
 522                                 $diffText = UtfNormal::cleanUp( $diffText );
 523                         }
 524                         wfProfileOut( "$fname-dodiff" );
 525                 } else {
 526                         $rev = Revision::newFromId( $row->rc_this_oldid );
 527                         if( is_null( $rev ) ) {
 528                                 $newtext = '';
 529                         } else {
 530                                 $newtext = $rev->getText();
 531                         }
 532                         $diffText = '<p><b>' . wfMsg( 'newpage' ) . '</b></p>' .
 533                                 '<div>' . nl2br( htmlspecialchars( $newtext ) ) . '</div>';
 534                 }
 535                 $completeText .= $diffText;
 536         }
 537
 538         wfProfileOut( $fname );
 539         return $completeText;
 540 }
 541
 542 ?>