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, $wgLang, $wgContLang, $wgTitle, $wgMemc, $wgDBname;
  20         global $wgRequest, $wgSitename, $wgLanguageCode, $wgContLanguageCode;
  21         global $wgFeedClasses, $wgUseRCPatrol;
  22         global $wgRCShowWatchingUsers, $wgShowUpdatedMarker;
  23         global $wgLinkCache;
  24         $fname = 'wfSpecialRecentchanges';
  25
  26         # Get query parameters
  27         $feedFormat = $wgRequest->getVal( 'feed' );
  28
  29         $defaults = array(
  30         /* int  */ 'days' => $wgUser->getDefaultOption('rcdays'),
  31         /* int  */ 'limit' => $wgUser->getDefaultOption('rclimit'),
  32         /* bool */ 'hideminor' => false,
  33         /* bool */ 'hidebots' => true,
  34         /* bool */ 'hideliu' => false,
  35         /* bool */ 'hidepatrolled' => false,
  36         /* text */ 'from' => '',
  37         /* text */ 'namespace' => null,
  38         /* bool */ 'invert' => false,
  39         );
  40
  41         extract($defaults);
  42
  43
  44         $days = $wgUser->getOption( 'rcdays' );
  45         if ( !$days ) { $days = $defaults['days']; }
  46         $days = $wgRequest->getInt( 'days', $days );
  47
  48         $limit = $wgUser->getOption( 'rclimit' );
  49         if ( !$limit ) { $limit = $defaults['limit']; }
  50
  51         #       list( $limit, $offset ) = wfCheckLimits( 100, 'rclimit' );
  52         $limit = $wgRequest->getInt( 'limit', $limit );
  53
  54         /* order of selection: url > preferences > default */
  55         $hideminor = $wgRequest->getBool( 'hideminor', $wgUser->getOption( 'hideminor') ? true : $defaults['hideminor'] );
  56
  57
  58         # As a feed, use limited settings only
  59         if( $feedFormat ) {
  60                 global $wgFeedLimit;
  61                 if( $limit > $wgFeedLimit ) {
  62                         $options['limit'] = $wgFeedLimit;
  63                 }
  64
  65         } else {
  66
  67                 $namespace = $wgRequest->getIntOrNull( 'namespace' );
  68                 $invert = $wgRequest->getBool( 'invert', $defaults['invert'] );
  69                 $hidebots = $wgRequest->getBool( 'hidebots', $defaults['hidebots'] );
  70                 $hideliu = $wgRequest->getBool( 'hideliu', $defaults['hideliu'] );
  71                 $hidepatrolled = $wgRequest->getBool( 'hidepatrolled', $defaults['hidepatrolled'] );
  72                 $from = $wgRequest->getVal( 'from', $defaults['from'] );
  73
  74                 # Get query parameters from path
  75                 if( $par ) {
  76                         $bits = preg_split( '/\s*,\s*/', trim( $par ) );
  77                         foreach ( $bits as $bit ) {
  78                                 if ( 'hidebots' == $bit ) $hidebots = 1;
  79                                 if ( 'bots' == $bit ) $hidebots = 0;
  80                                 if ( 'hideminor' == $bit ) $hideminor = 1;
  81                                 if ( 'minor' == $bit ) $hideminor = 0;
  82                                 if ( 'hideliu' == $bit ) $hideliu = 1;
  83                                 if ( 'hidepatrolled' == $bit ) $hidepatrolled = 1;
  84
  85                                 if ( is_numeric( $bit ) ) {
  86                                         $limit = $bit;
  87                                 }
  88
  89                                 if ( preg_match( '/^limit=(\d+)$/', $bit, $m ) ) {
  90                                         $limit = $m[1];
  91                                 }
  92
  93                                 if ( preg_match( '/^days=(\d+)$/', $bit, $m ) ) {
  94                                         $days = $m[1];
  95                                 }
  96                         }
  97                 }
  98         }
  99
 100         if ( $limit < 0 || $limit > 5000 ) $limit = $defaults['limit'];
 101
 102
 103         # Database connection and caching
 104         $dbr =& wfGetDB( DB_SLAVE );
 105         extract( $dbr->tableNames( 'recentchanges', 'watchlist' ) );
 106
 107
 108         $cutoff_unixtime = time() - ( $days * 86400 );
 109         $cutoff_unixtime = $cutoff_unixtime - ($cutoff_unixtime % 86400);
 110         $cutoff = $dbr->timestamp( $cutoff_unixtime );
 111         if(preg_match('/^[0-9]{14}$/', $from) and $from > wfTimestamp(TS_MW,$cutoff)) {
 112                 $cutoff = $dbr->timestamp($from);
 113         } else {
 114                 $from = $defaults['from'];
 115         }
 116
 117         # 10 seconds server-side caching max
 118         $wgOut->setSquidMaxage( 10 );
 119
 120         # Get last modified date, for client caching
 121         # Don't use this if we are using the patrol feature, patrol changes don't update the timestamp
 122         $lastmod = $dbr->selectField( 'recentchanges', 'MAX(rc_timestamp)', false, $fname );
 123         if ( $feedFormat || !$wgUseRCPatrol ) {
 124                 if( $lastmod && $wgOut->checkLastModified( $lastmod ) ){
 125                         # Client cache fresh and headers sent, nothing more to do.
 126                         return;
 127                 }
 128         }
 129
 130         $hidem  = $hideminor ? 'AND rc_minor=0' : '';
 131         $hidem .= $hidebots ? ' AND rc_bot=0' : '';
 132         $hidem .= $hideliu ? ' AND rc_user=0' : '';
 133         $hidem .= $hidepatrolled ? ' AND rc_patrolled=0' : '';
 134         $hidem .= is_null( $namespace ) ?  ''   : ' AND rc_namespace' . ($invert ? '!=' : '=') . $namespace;
 135
 136         // This is the big thing!
 137
 138         $uid = $wgUser->getID();
 139
 140         // Perform query
 141         $sql2 = "SELECT *" . ($uid ? ",wl_user,wl_notificationtimestamp" : "") . " FROM $recentchanges " .
 142           ($uid ? "LEFT OUTER JOIN $watchlist ON wl_user={$uid} AND wl_title=rc_title AND wl_namespace=rc_namespace " : "") .
 143           "WHERE rc_timestamp > '{$cutoff}' {$hidem} " .
 144           "ORDER BY rc_timestamp DESC LIMIT {$limit}";
 145         $res = $dbr->query( $sql2, $fname );
 146
 147         // Fetch results, prepare a batch link existence check query
 148         $rows = array();
 149         $batch = new LinkBatch;
 150         while( $row = $dbr->fetchObject( $res ) ){
 151                 $rows[] = $row;
 152                 // User page link
 153                 $title = Title::makeTitleSafe( NS_USER, $row->rc_user_text );
 154                 $batch->addObj( $title );
 155
 156                 // User talk
 157                 $title = Title::makeTitleSafe( NS_USER_TALK, $row->rc_user_text );
 158                 $batch->addObj( $title );
 159
 160         }
 161         $dbr->freeResult( $res );
 162
 163         // Run existence checks
 164         $batch->execute( $wgLinkCache );
 165
 166         if( $feedFormat ) {
 167                 rcOutputFeed( $rows, $feedFormat, $limit, $hideminor, $lastmod );
 168         } else {
 169
 170                 # Web output...
 171
 172                 // Output header
 173                 if ( !$specialPage->including() ) {
 174                         $wgOut->addWikiText( wfMsgForContent( "recentchangestext" ) );
 175
 176                         // Dump everything here
 177                         $nondefaults = array();
 178
 179                         appendToArrayIfNotDefault( 'days', $days, $defaults, $nondefaults);
 180                         appendToArrayIfNotDefault( 'limit', $limit , $defaults, $nondefaults);
 181                         appendToArrayIfNotDefault( 'hideminor', $hideminor, $defaults, $nondefaults);
 182                         appendToArrayIfNotDefault( 'hidebots', $hidebots, $defaults, $nondefaults);
 183                         appendToArrayIfNotDefault( 'hideliu', $hideliu, $defaults, $nondefaults);
 184                         appendToArrayIfNotDefault( 'hidepatrolled', $hidepatrolled, $defaults, $nondefaults);
 185                         appendToArrayIfNotDefault( 'from', $from, $defaults, $nondefaults);
 186                         appendToArrayIfNotDefault( 'namespace', $namespace, $defaults, $nondefaults);
 187                         appendToArrayIfNotDefault( 'invert', $invert, $defaults, $nondefaults);
 188
 189                         // Add end of the texts
 190                         $wgOut->addHTML( '<div class="rcoptions">' . rcOptionsPanel( $defaults, $nondefaults ) );
 191                         $wgOut->addHTML( rcNamespaceForm( $namespace, $invert, $nondefaults) . '</div>');
 192                 }
 193
 194                 // And now for the content
 195                 $sk = $wgUser->getSkin();
 196                 $wgOut->setSyndicated( true );
 197                 $list =& new ChangesList( $sk );
 198                 $s = $list->beginRecentChangesList();
 199                 $counter = 1;
 200                 foreach( $rows as $obj ){
 201                         if( $limit == 0) {
 202                                 break;
 203                         }
 204
 205                         if ( ! ( $hideminor     && $obj->rc_minor     ) &&
 206                              ! ( $hidepatrolled && $obj->rc_patrolled ) ) {
 207                                 $rc = RecentChange::newFromRow( $obj );
 208                                 $rc->counter = $counter++;
 209
 210                                 if ($wgShowUpdatedMarker
 211                                         && !empty( $obj->wl_notificationtimestamp )
 212                                         && ($obj->rc_timestamp >= $obj->wl_notificationtimestamp)) {
 213                                                 $rc->notificationtimestamp = true;
 214                                 } else {
 215                                         $rc->notificationtimestamp = false;
 216                                 }
 217
 218                                 if ($wgRCShowWatchingUsers && $wgUser->getOption( 'shownumberswatching' )) {
 219                                         $sql3 = "SELECT COUNT(*) AS n FROM $watchlist WHERE wl_title='" . $dbr->strencode($obj->rc_title) ."' AND wl_namespace=$obj->rc_namespace" ;
 220                                         $res3 = $dbr->query( $sql3, 'wfSpecialRecentChanges');
 221                                         $x = $dbr->fetchObject( $res3 );
 222                                         $rc->numberofWatchingusers = $x->n;
 223                                 } else {
 224                                         $rc->numberofWatchingusers = 0;
 225                                 }
 226                                 $s .= $list->recentChangesLine( $rc, !empty( $obj->wl_user ) );
 227                                 --$limit;
 228                         }
 229                 }
 230                 $s .= $list->endRecentChangesList();
 231                 $wgOut->addHTML( $s );
 232         }
 233 }
 234
 235 function rcOutputFeed( $rows, $feedFormat, $limit, $hideminor, $lastmod ) {
 236         global $messageMemc, $wgDBname, $wgFeedCacheTimeout;
 237         global $wgFeedClasses, $wgTitle, $wgSitename, $wgContLanguageCode;
 238
 239         if( !isset( $wgFeedClasses[$feedFormat] ) ) {
 240                 wfHttpError( 500, "Internal Server Error", "Unsupported feed type." );
 241                 return false;
 242         }
 243
 244         $timekey = "$wgDBname:rcfeed:$feedFormat:timestamp";
 245         $key = "$wgDBname:rcfeed:$feedFormat:limit:$limit:minor:$hideminor";
 246
 247         $feedTitle = $wgSitename . ' - ' . wfMsgForContent( 'recentchanges' ) .
 248                 ' [' . $wgContLanguageCode . ']';
 249         $feed = new $wgFeedClasses[$feedFormat](
 250                 $feedTitle,
 251                 htmlspecialchars( wfMsgForContent( 'recentchangestext' ) ),
 252                 $wgTitle->getFullUrl() );
 253
 254         /**
 255          * Bumping around loading up diffs can be pretty slow, so where
 256          * possible we want to cache the feed output so the next visitor
 257          * gets it quick too.
 258          */
 259         $cachedFeed = false;
 260         if( $feedLastmod = $messageMemc->get( $timekey ) ) {
 261                 /**
 262                  * If the cached feed was rendered very recently, we may
 263                  * go ahead and use it even if there have been edits made
 264                  * since it was rendered. This keeps a swarm of requests
 265                  * from being too bad on a super-frequently edited wiki.
 266                  */
 267                 if( time() - wfTimestamp( TS_UNIX, $feedLastmod )
 268                                 < $wgFeedCacheTimeout
 269                         || wfTimestamp( TS_UNIX, $feedLastmod )
 270                                 > wfTimestamp( TS_UNIX, $lastmod ) ) {
 271                         wfDebug( "RC: loading feed from cache ($key; $feedLastmod; $lastmod)...\n" );
 272                         $cachedFeed = $messageMemc->get( $key );
 273                 } else {
 274                         wfDebug( "RC: cached feed timestamp check failed ($feedLastmod; $lastmod)\n" );
 275                 }
 276         }
 277         if( is_string( $cachedFeed ) ) {
 278                 wfDebug( "RC: Outputting cached feed\n" );
 279                 $feed->httpHeaders();
 280                 echo $cachedFeed;
 281         } else {
 282                 wfDebug( "RC: rendering new feed and caching it\n" );
 283                 ob_start();
 284                 rcDoOutputFeed( $rows, $feed );
 285                 $cachedFeed = ob_get_contents();
 286                 ob_end_flush();
 287
 288                 $expire = 3600 * 24; # One day
 289                 $messageMemc->set( $key, $cachedFeed );
 290                 $messageMemc->set( $timekey, wfTimestamp( TS_MW ), $expire );
 291         }
 292         return true;
 293 }
 294
 295 function rcDoOutputFeed( $rows, &$feed ) {
 296         global $wgSitename, $wgFeedClasses, $wgContLanguageCode;
 297
 298         $feed->outHeader();
 299
 300         # Merge adjacent edits by one user
 301         $sorted = array();
 302         $n = 0;
 303         foreach( $rows as $obj ) {
 304                 if( $n > 0 &&
 305                         $obj->rc_namespace >= 0 &&
 306                         $obj->rc_cur_id == $sorted[$n-1]->rc_cur_id &&
 307                         $obj->rc_user_text == $sorted[$n-1]->rc_user_text ) {
 308                         $sorted[$n-1]->rc_last_oldid = $obj->rc_last_oldid;
 309                 } else {
 310                         $sorted[$n] = $obj;
 311                         $n++;
 312                 }
 313                 $first = false;
 314         }
 315
 316         foreach( $sorted as $obj ) {
 317                 $title = Title::makeTitle( $obj->rc_namespace, $obj->rc_title );
 318                 $talkpage = $title->getTalkPage();
 319                 $item = new FeedItem(
 320                         $title->getPrefixedText(),
 321                         rcFormatDiff( $obj ),
 322                         $title->getFullURL(),
 323                         $obj->rc_timestamp,
 324                         $obj->rc_user_text,
 325                         $talkpage->getFullURL()
 326                         );
 327                 $feed->outItem( $item );
 328         }
 329         $feed->outFooter();
 330 }
 331
 332 /**
 333  *
 334  */
 335 function rcCountLink( $lim, $d, $page='Recentchanges', $more='' ) {
 336         global $wgUser, $wgLang, $wgContLang;
 337         $sk = $wgUser->getSkin();
 338         $s = $sk->makeKnownLink( $wgContLang->specialPage( $page ),
 339           ($lim ? $wgLang->formatNum( "{$lim}" ) : wfMsg( 'recentchangesall' ) ), "{$more}" .
 340           ($d ? "days={$d}&" : '') . 'limit='.$lim );
 341         return $s;
 342 }
 343
 344 /**
 345  *
 346  */
 347 function rcDaysLink( $lim, $d, $page='Recentchanges', $more='' ) {
 348         global $wgUser, $wgLang, $wgContLang;
 349         $sk = $wgUser->getSkin();
 350         $s = $sk->makeKnownLink( $wgContLang->specialPage( $page ),
 351           ($d ? $wgLang->formatNum( "{$d}" ) : wfMsg( 'recentchangesall' ) ), $more.'days='.$d .
 352           ($lim ? '&limit='.$lim : '') );
 353         return $s;
 354 }
 355
 356 /**
 357  * Used by Recentchangeslinked
 358  */
 359 function rcDayLimitLinks( $days, $limit, $page='Recentchanges', $more='', $doall = false, $minorLink = '',
 360         $botLink = '', $liuLink = '', $patrLink = '' ) {
 361         if ($more != '') $more .= '&';
 362         $cl = rcCountLink( 50, $days, $page, $more ) . ' | ' .
 363           rcCountLink( 100, $days, $page, $more  ) . ' | ' .
 364           rcCountLink( 250, $days, $page, $more  ) . ' | ' .
 365           rcCountLink( 500, $days, $page, $more  ) .
 366           ( $doall ? ( ' | ' . rcCountLink( 0, $days, $page, $more ) ) : '' );
 367         $dl = rcDaysLink( $limit, 1, $page, $more  ) . ' | ' .
 368           rcDaysLink( $limit, 3, $page, $more  ) . ' | ' .
 369           rcDaysLink( $limit, 7, $page, $more  ) . ' | ' .
 370           rcDaysLink( $limit, 14, $page, $more  ) . ' | ' .
 371           rcDaysLink( $limit, 30, $page, $more  ) .
 372           ( $doall ? ( ' | ' . rcDaysLink( $limit, 0, $page, $more ) ) : '' );
 373         $shm = wfMsg( 'showhideminor', $minorLink, $botLink, $liuLink, $patrLink );
 374         $note = wfMsg( 'rclinks', $cl, $dl, $shm );
 375         return $note;
 376 }
 377
 378
 379 /**
 380  * Makes change an option link which carries all the other options
 381  */
 382 function makeOptionsLink( $title, $override, $options ) {
 383         global $wgUser, $wgLang, $wgContLang;
 384         $sk = $wgUser->getSkin();
 385         return $sk->makeKnownLink( $wgContLang->specialPage( 'Recentchanges' ),
 386                 $title, wfArrayToCGI( $override, $options ) );
 387 }
 388
 389 /**
 390  * Creates the options panel
 391  */
 392 function rcOptionsPanel( $defaults, $nondefaults ) {
 393         global $wgLang;
 394
 395         $options = $nondefaults + $defaults;
 396
 397         if( $options['from'] )
 398                 $note = wfMsg( 'rcnotefrom', $wgLang->formatNum( $options['limit'] ), $wgLang->timeanddate( $options['from'], true ) );
 399         else
 400                 $note = wfMsg( 'rcnote', $wgLang->formatNum( $options['limit'] ), $wgLang->formatNum( $options['days'] ) );
 401
 402         // limit links
 403         $cl = '';
 404         $options_limit = array(50, 100, 250, 500);
 405         $i = 0;
 406         while ( $i+1 < count($options_limit) ) {
 407                 $cl .=  makeOptionsLink( $options_limit[$i], array( 'limit' => $options_limit[$i] ), $nondefaults) . ' | ' ;
 408                 $i++;
 409         }
 410         $cl .=  makeOptionsLink( $options_limit[$i], array( 'limit' => $options_limit[$i] ), $nondefaults) ;
 411
 412         // day links, reset 'from' to none
 413         $dl = '';
 414         $options_days = array(1, 3, 7, 14, 30);
 415         $i = 0;
 416         while ( $i+1 < count($options_days) ) {
 417                 $dl .=  makeOptionsLink( $options_days[$i], array( 'days' => $options_days[$i], 'from' => '' ), $nondefaults) . ' | ' ;
 418                 $i++;
 419         }
 420         $dl .=  makeOptionsLink( $options_days[$i], array( 'days' => $options_days[$i], 'from' => '' ), $nondefaults) ;
 421
 422         // show/hide links
 423         $showhide = array( wfMsg( 'show' ), wfMsg( 'hide' ));
 424         $minorLink = makeOptionsLink( $showhide[1-$options['hideminor']],
 425                 array( 'hideminor' => 1-$options['hideminor'] ), $nondefaults);
 426         $botLink = makeOptionsLink( $showhide[1-$options['hidebots']],
 427                 array( 'hidebots' => 1-$options['hidebots'] ), $nondefaults);
 428         $liuLink   = makeOptionsLink( $showhide[1-$options['hideliu']],
 429                 array( 'hideliu' => 1-$options['hideliu'] ), $nondefaults);
 430         $patrLink  = makeOptionsLink( $showhide[1-$options['hidepatrolled']],
 431                 array( 'hidepatrolled' => 1-$options['hidepatrolled'] ), $nondefaults);
 432
 433         $hl = wfMsg( 'showhideminor', $minorLink, $botLink, $liuLink, $patrLink );
 434
 435         // show from this onward link
 436         $now = $wgLang->timeanddate( wfTimestampNow(), true );
 437         $tl =  makeOptionsLink( $now, array( 'from' => wfTimestampNow()), $nondefaults );
 438
 439         $rclinks = wfMsg( 'rclinks', $cl, $dl, $hl );
 440         $rclistfrom = wfMsg( 'rclistfrom', $tl );
 441         return "$note<br />$rclinks<br />$rclistfrom";
 442
 443 }
 444
 445 /**<F2>
 446  * Creates the choose namespace selection
 447  *
 448  * @access private
 449  *
 450  * @param mixed $namespace The key of the currently selected namespace, empty string
 451  *              if there is none
 452  * @param bool $invert Whether to invert the namespace selection
 453  * @param array $nondefaults An array of non default options to be remembered
 454  *
 455  * @return string
 456  */
 457 function rcNamespaceForm ( $namespace, $invert, $nondefaults ) {
 458         global $wgContLang, $wgScript;
 459         $t = Title::makeTitle( NS_SPECIAL, 'Recentchanges' );
 460
 461         $namespaceselect = "<select name='namespace' id='nsselectbox'>";
 462         $namespaceselect .= '<option value="" ' . ($namespace === '' ? ' selected="selected"' : '') . '>' . wfMsg( 'contributionsall' ) . '</option>';
 463         $arr =  $wgContLang->getFormattedNamespaces();
 464         foreach ( $arr as $ns => $name ) {
 465                 if( $ns < NS_MAIN )
 466                         continue;
 467                 $n = $ns === NS_MAIN ? wfMsg ( 'blanknamespace' ) : $name;
 468                 $sel = $namespace === (string) $ns ? ' selected="selected"' : '';
 469                 $namespaceselect .= "<option value='$ns'$sel>$n</option>";
 470         }
 471         $namespaceselect .= '</select>';
 472
 473         $out = '';
 474         $out .= "<div class='namespaceselector'><form method='get' action='{$wgScript}'>\n";
 475         foreach ( $nondefaults as $key => $value ) {
 476                 if ($key != 'namespace' && $key != 'invert')
 477                         $out .= "<input type='hidden' name='$key' value='$value' />";
 478         }
 479
 480         $submitbutton = '<input type="submit" value="' . wfMsg( 'allpagessubmit' ) . '" />';
 481         $invertbox = "<input type='checkbox' name='invert' value='1' id='nsinvert'" . ( $invert ? ' checked="checked"' : '' ) . ' />';
 482
 483
 484         $out .= '<input type="hidden" name="title" value="'.$t->getPrefixedText().'" />';
 485         $out .= "
 486 <div id='nsselect' class='recentchanges'>
 487         <label for='nsselectbox'>" . wfMsg('namespace') . "</label>
 488         $namespaceselect $submitbutton $invertbox <label for='nsinvert'>" . wfMsg('invert') . "</label>
 489 </div>";
 490         $out .= '</form></div>';
 491         return $out;
 492 }
 493
 494
 495 /**
 496  * Format a diff for the newsfeed
 497  */
 498 function rcFormatDiff( $row ) {
 499         $fname = 'rcFormatDiff';
 500         wfProfileIn( $fname );
 501
 502         require_once( 'DifferenceEngine.php' );
 503         $comment = "<p>" . htmlspecialchars( $row->rc_comment ) . "</p>\n";
 504
 505         if( $row->rc_namespace >= 0 ) {
 506                 global $wgContLang;
 507
 508                 #$diff =& new DifferenceEngine( $row->rc_this_oldid, $row->rc_last_oldid, $row->rc_id );
 509                 #$diff->showDiffPage();
 510
 511                 $titleObj = Title::makeTitle( $row->rc_namespace, $row->rc_title );
 512                 $dbr =& wfGetDB( DB_SLAVE );
 513                 $newrev =& Revision::newFromTitle( $titleObj, $row->rc_this_oldid );
 514                 if( $newrev ) {
 515                         $newtext = $newrev->getText();
 516                 } else {
 517                         $diffText = "<p>Can't load revision $row->rc_this_oldid</p>";
 518                         wfProfileOut( $fname );
 519                         return $comment . $diffText;
 520                 }
 521
 522                 if( $row->rc_last_oldid ) {
 523                         wfProfileIn( "$fname-dodiff" );
 524                         $oldrev =& Revision::newFromId( $row->rc_last_oldid );
 525                         if( !$oldrev ) {
 526                                 $diffText = "<p>Can't load old revision $row->rc_last_oldid</p>";
 527                                 wfProfileOut( $fname );
 528                                 return $comment . $diffText;
 529                         }
 530                         $oldtext = $oldrev->getText();
 531
 532                         # Old entries may contain illegal characters
 533                         # which will damage output
 534                         $oldtext = UtfNormal::cleanUp( $oldtext );
 535
 536                         global $wgFeedDiffCutoff;
 537                         if( strlen( $newtext ) > $wgFeedDiffCutoff ||
 538                                 strlen( $oldtext ) > $wgFeedDiffCutoff ) {
 539                                 $diffLink = $titleObj->escapeFullUrl(
 540                                         'diff=' . $row->rc_this_oldid .
 541                                         '&oldid=' . $row->rc_last_oldid );
 542                                 $diffText = '<a href="' .
 543                                         $diffLink .
 544                                         '">' .
 545                                         htmlspecialchars( wfMsgForContent( 'difference' ) ) .
 546                                         '</a>';
 547                         } else {
 548                                 $diffText = DifferenceEngine::getDiff( $oldtext, $newtext,
 549                                   wfMsg( 'revisionasof', $wgContLang->timeanddate( $row->rc_timestamp ) ),
 550                                   wfMsg( 'currentrev' ) );
 551                         }
 552                         wfProfileOut( "$fname-dodiff" );
 553                 } else {
 554                         $diffText = '<p><b>' . wfMsg( 'newpage' ) . '</b></p>' .
 555                                 '<div>' . nl2br( htmlspecialchars( $newtext ) ) . '</div>';
 556                 }
 557
 558                 wfProfileOut( $fname );
 559                 return $comment . $diffText;
 560         }
 561
 562         wfProfileOut( $fname );
 563         return $comment;
 564 }
 565
 566
 567 /**
 568  * Appends to second array if $value differs from that in $default
 569  */
 570 function appendToArrayIfNotDefault( $key, $value, $default, &$changed )
 571 {
 572         if ( is_null( $changed ) ) {
 573                 die();
 574         }
 575         if ( $default[$key] !== $value ) {
 576                 $changed[$key] = $value;
 577         }
 578 }
 579
 580 ?>