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