includes/PageHistory.php

   1 <?php
   2 /**
   3  * Page history
   4  *
   5  * Split off from Article.php and Skin.php, 2003-12-22
   6  * @package MediaWiki
   7  */
   8
   9 /**
  10  * This class handles printing the history page for an article.  In order to
  11  * be efficient, it uses timestamps rather than offsets for paging, to avoid
  12  * costly LIMIT,offset queries.
  13  *
  14  * Construct it by passing in an Article, and call $h->history() to print the
  15  * history.
  16  *
  17  * @package MediaWiki
  18  */
  19
  20 class PageHistory {
  21         const DIR_PREV = 0;
  22         const DIR_NEXT = 1;
  23
  24         var $mArticle, $mTitle, $mSkin;
  25         var $lastdate;
  26         var $linesonpage;
  27         var $mNotificationTimestamp;
  28         var $mLatestId = null;
  29
  30         /**
  31          * Construct a new PageHistory.
  32          *
  33          * @param Article $article
  34          * @returns nothing
  35          */
  36         function PageHistory($article) {
  37                 global $wgUser;
  38
  39                 $this->mArticle =& $article;
  40                 $this->mTitle =& $article->mTitle;
  41                 $this->mNotificationTimestamp = NULL;
  42                 $this->mSkin = $wgUser->getSkin();
  43
  44                 $this->defaultLimit = 50;
  45         }
  46
  47         /**
  48          * Print the history page for an article.
  49          *
  50          * @returns nothing
  51          */
  52         function history() {
  53                 global $wgOut, $wgRequest, $wgTitle;
  54
  55                 /*
  56                  * Allow client caching.
  57                  */
  58
  59                 if( $wgOut->checkLastModified( $this->mArticle->getTimestamp() ) )
  60                         /* Client cache fresh and headers sent, nothing more to do. */
  61                         return;
  62
  63                 $fname = 'PageHistory::history';
  64                 wfProfileIn( $fname );
  65
  66                 /*
  67                  * Setup page variables.
  68                  */
  69                 $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
  70                 $wgOut->setSubtitle( wfMsg( 'revhistory' ) );
  71                 $wgOut->setArticleFlag( false );
  72                 $wgOut->setArticleRelated( true );
  73                 $wgOut->setRobotpolicy( 'noindex,nofollow' );
  74                 $wgOut->setSyndicated( true );
  75
  76                 $feedType = $wgRequest->getVal( 'feed' );
  77                 if( $feedType ) {
  78                         wfProfileOut( $fname );
  79                         return $this->feed( $feedType );
  80                 }
  81
  82                 /*
  83                  * Fail if article doesn't exist.
  84                  */
  85                 if( !$this->mTitle->exists() ) {
  86                         $wgOut->addWikiText( wfMsg( 'nohistory' ) );
  87                         wfProfileOut( $fname );
  88                         return;
  89                 }
  90
  91                 $dbr =& wfGetDB(DB_SLAVE);
  92
  93                 /*
  94                  * Extract limit, the number of revisions to show, and
  95                  * offset, the timestamp to begin at, from the URL.
  96                  */
  97                 $limit = $wgRequest->getInt('limit', $this->defaultLimit);
  98                 $offset = $wgRequest->getText('offset');
  99
 100                 /* Offset must be an integral. */
 101                 if (!strlen($offset) || !preg_match("/^[0-9]+$/", $offset))
 102                         $offset = 0;
 103 #               $offset = $dbr->timestamp($offset);
 104                 $dboffset = $offset === 0 ? 0 : $dbr->timestamp($offset);
 105                 /*
 106                  * "go=last" means to jump to the last history page.
 107                  */
 108                 if (($gowhere = $wgRequest->getText("go")) !== NULL) {
 109                         switch ($gowhere) {
 110                         case "first":
 111                                 if (($lastid = $this->getLastOffsetForPaging($this->mTitle->getArticleID(), $limit)) === NULL)
 112                                         break;
 113                                 $gourl = $wgTitle->getLocalURL("action=history&limit={$limit}&offset=".
 114                                                 wfTimestamp(TS_MW, $lastid));
 115                                 break;
 116                         default:
 117                                 $gourl = NULL;
 118                         }
 119
 120                         if (!is_null($gourl)) {
 121                                 $wgOut->redirect($gourl);
 122                                 return;
 123                         }
 124                 }
 125
 126                 /*
 127                  * Fetch revisions.
 128                  *
 129                  * If the user clicked "previous", we retrieve the revisions backwards,
 130                  * then reverse them.  This is to avoid needing to know the timestamp of
 131                  * previous revisions when generating the URL.
 132                  */
 133                 $direction = $this->getDirection();
 134                 $revisions = $this->fetchRevisions($limit, $dboffset, $direction);
 135                 $navbar = $this->makeNavbar($revisions, $offset, $limit, $direction);
 136
 137                 /*
 138                  * We fetch one more revision than needed to get the timestamp of the
 139                  * one after this page (and to know if it exists).
 140                  *
 141                  * linesonpage stores the actual number of lines.
 142                  */
 143                 if (count($revisions) < $limit + 1)
 144                         $this->linesonpage = count($revisions);
 145                 else
 146                         $this->linesonpage = count($revisions) - 1;
 147
 148                 /* Un-reverse revisions */
 149                 if ($direction == PageHistory::DIR_PREV)
 150                         $revisions = array_reverse($revisions);
 151
 152                 /*
 153                  * Print the top navbar.
 154                  */
 155                 $s = $navbar;
 156                 $s .= $this->beginHistoryList();
 157                 $counter = 1;
 158
 159                 /*
 160                  * Print each revision, excluding the one-past-the-end, if any.
 161                  */
 162                 foreach (array_slice($revisions, 0, $limit) as $i => $line) {
 163                         $latest = !$i && $offset == 0;
 164                         $firstInList = !$i;
 165                         $next = isset( $revisions[$i + 1] ) ? $revisions[$i + 1 ] : null;
 166                         $s .= $this->historyLine($line, $next, $counter, $this->getNotificationTimestamp(), $latest, $firstInList);
 167                         $counter++;
 168                 }
 169
 170                 /*
 171                  * End navbar.
 172                 */
 173                 $s .= $this->endHistoryList();
 174                 $s .= $navbar;
 175
 176                 $wgOut->addHTML( $s );
 177                 wfProfileOut( $fname );
 178         }
 179
 180         /** @todo document */
 181         function beginHistoryList() {
 182                 global $wgTitle;
 183                 $this->lastdate = '';
 184                 $s = wfMsgExt( 'histlegend', array( 'parse') );
 185                 $s .= '<form action="' . $wgTitle->escapeLocalURL( '-' ) . '" method="get">';
 186                 $prefixedkey = htmlspecialchars($wgTitle->getPrefixedDbKey());
 187
 188                 // The following line is SUPPOSED to have double-quotes around the
 189                 // $prefixedkey variable, because htmlspecialchars() doesn't escape
 190                 // single-quotes.
 191                 //
 192                 // On at least two occasions people have changed it to single-quotes,
 193                 // which creates invalid HTML and incorrect display of the resulting
 194                 // link.
 195                 //
 196                 // Please do not break this a third time. Thank you for your kind
 197                 // consideration and cooperation.
 198                 //
 199                 $s .= "<input type='hidden' name='title' value=\"{$prefixedkey}\" />\n";
 200
 201                 $s .= $this->submitButton();
 202                 $s .= '<ul id="pagehistory">' . "\n";
 203                 return $s;
 204         }
 205
 206         /** @todo document */
 207         function endHistoryList() {
 208                 $s = '</ul>';
 209                 $s .= $this->submitButton( array( 'id' => 'historysubmit' ) );
 210                 $s .= '</form>';
 211                 return $s;
 212         }
 213
 214         /** @todo document */
 215         function submitButton( $bits = array() ) {
 216                 return ( $this->linesonpage > 0 )
 217                         ? wfElement( 'input', array_merge( $bits,
 218                                 array(
 219                                         'class'     => 'historysubmit',
 220                                         'type'      => 'submit',
 221                                         'accesskey' => wfMsg( 'accesskey-compareselectedversions' ),
 222                                         'title'     => wfMsg( 'tooltip-compareselectedversions' ),
 223                                         'value'     => wfMsg( 'compareselectedversions' ),
 224                                 ) ) )
 225                         : '';
 226         }
 227
 228         /** @todo document */
 229         function historyLine( $row, $next, $counter = '', $notificationtimestamp = false, $latest = false, $firstInList = false ) {
 230                 global $wgUser;
 231                 $rev = new Revision( $row );
 232                 $rev->setTitle( $this->mTitle );
 233
 234                 $s = '<li>';
 235                 $curlink = $this->curLink( $rev, $latest );
 236                 $lastlink = $this->lastLink( $rev, $next, $counter );
 237                 $arbitrary = $this->diffButtons( $rev, $firstInList, $counter );
 238                 $link = $this->revLink( $rev );
 239                 $user = $this->mSkin->revUserLink( $rev );
 240
 241                 $s .= "($curlink) ($lastlink) $arbitrary";
 242
 243                 if( $wgUser->isAllowed( 'deleterevision' ) ) {
 244                         $revdel = Title::makeTitle( NS_SPECIAL, 'Revisiondelete' );
 245                         if( $firstInList ) {
 246                                 // We don't currently handle well changing the top revision's settings
 247                                 $del = wfMsgHtml( 'rev-delundel' );
 248                         } else {
 249                                 $del = $this->mSkin->makeKnownLinkObj( $revdel,
 250                                         wfMsg( 'rev-delundel' ),
 251                                         'target=' . urlencode( $this->mTitle->getPrefixedDbkey() ) .
 252                                         '&oldid=' . urlencode( $rev->getId() ) );
 253                         }
 254                         $s .= "(<small>$del</small>) ";
 255                 }
 256
 257                 $s .= " $link <span class='history-user'>$user</span>";
 258
 259                 if( $row->rev_minor_edit ) {
 260                         $s .= ' ' . wfElement( 'span', array( 'class' => 'minor' ), wfMsg( 'minoreditletter') );
 261                 }
 262
 263                 $s .= $this->mSkin->revComment( $rev );
 264                 if ($notificationtimestamp && ($row->rev_timestamp >= $notificationtimestamp)) {
 265                         $s .= ' <span class="updatedmarker">' .  wfMsgHtml( 'updatedmarker' ) . '</span>';
 266                 }
 267                 if( $row->rev_deleted & Revision::MW_REV_DELETED_TEXT ) {
 268                         $s .= ' ' . wfMsgHtml( 'deletedrev' );
 269                 }
 270                 $s .= "</li>\n";
 271
 272                 return $s;
 273         }
 274
 275         /** @todo document */
 276         function revLink( $rev ) {
 277                 global $wgLang;
 278                 $date = $wgLang->timeanddate( wfTimestamp(TS_MW, $rev->getTimestamp()), true );
 279                 if( $rev->userCan( Revision::MW_REV_DELETED_TEXT ) ) {
 280                         $link = $this->mSkin->makeKnownLinkObj(
 281                                 $this->mTitle, $date, "oldid=" . $rev->getId() );
 282                 } else {
 283                         $link = $date;
 284                 }
 285                 if( $rev->isDeleted( Revision::MW_REV_DELETED_TEXT ) ) {
 286                         return '<span class="history-deleted">' . $link . '</span>';
 287                 }
 288                 return $link;
 289         }
 290
 291         /** @todo document */
 292         function curLink( $rev, $latest ) {
 293                 $cur = wfMsgExt( 'cur', array( 'escape') );
 294                 if( $latest || !$rev->userCan( Revision::MW_REV_DELETED_TEXT ) ) {
 295                         return $cur;
 296                 } else {
 297                         return $this->mSkin->makeKnownLinkObj(
 298                                 $this->mTitle, $cur,
 299                                 'diff=' . $this->getLatestID() .
 300                                 "&oldid=" . $rev->getId() );
 301                 }
 302         }
 303
 304         /** @todo document */
 305         function lastLink( $rev, $next, $counter ) {
 306                 $last = wfMsgExt( 'last', array( 'escape' ) );
 307                 if( is_null( $next ) ) {
 308                         if( $rev->getTimestamp() == $this->getEarliestOffset() ) {
 309                                 return $last;
 310                         } else {
 311                                 // Cut off by paging; there are more behind us...
 312                                 return $this->mSkin->makeKnownLinkObj(
 313                                         $this->mTitle,
 314                                         $last,
 315                                         "diff=" . $rev->getId() . "&oldid=prev" );
 316                         }
 317                 } elseif( !$rev->userCan( Revision::MW_REV_DELETED_TEXT ) ) {
 318                         return $last;
 319                 } else {
 320                         return $this->mSkin->makeKnownLinkObj(
 321                                 $this->mTitle,
 322                                 $last,
 323                                 "diff=" . $rev->getId() . "&oldid={$next->rev_id}"
 324                                 /*,
 325                                 '',
 326                                 '',
 327                                 "tabindex={$counter}"*/ );
 328                 }
 329         }
 330
 331         /** @todo document */
 332         function diffButtons( $rev, $firstInList, $counter ) {
 333                 if( $this->linesonpage > 1) {
 334                         $radio = array(
 335                                 'type'  => 'radio',
 336                                 'value' => $rev->getId(),
 337 # do we really need to flood this on every item?
 338 #                               'title' => wfMsgHtml( 'selectolderversionfordiff' )
 339                         );
 340
 341                         if( !$rev->userCan( Revision::MW_REV_DELETED_TEXT ) ) {
 342                                 $radio['disabled'] = 'disabled';
 343                         }
 344
 345                         /** @todo: move title texts to javascript */
 346                         if ( $firstInList ) {
 347                                 $first = wfElement( 'input', array_merge(
 348                                         $radio,
 349                                         array(
 350                                                 'style' => 'visibility:hidden',
 351                                                 'name'  => 'oldid' ) ) );
 352                                 $checkmark = array( 'checked' => 'checked' );
 353                         } else {
 354                                 if( $counter == 2 ) {
 355                                         $checkmark = array( 'checked' => 'checked' );
 356                                 } else {
 357                                         $checkmark = array();
 358                                 }
 359                                 $first = wfElement( 'input', array_merge(
 360                                         $radio,
 361                                         $checkmark,
 362                                         array( 'name'  => 'oldid' ) ) );
 363                                 $checkmark = array();
 364                         }
 365                         $second = wfElement( 'input', array_merge(
 366                                 $radio,
 367                                 $checkmark,
 368                                 array( 'name'  => 'diff' ) ) );
 369                         return $first . $second;
 370                 } else {
 371                         return '';
 372                 }
 373         }
 374
 375         /** @todo document */
 376         function getLatestOffset( $id = null ) {
 377                 if ( $id === null) $id = $this->mTitle->getArticleID();
 378                 return $this->getExtremeOffset( $id, 'max' );
 379         }
 380
 381         /** @todo document */
 382         function getEarliestOffset( $id = null ) {
 383                 if ( $id === null) $id = $this->mTitle->getArticleID();
 384                 return $this->getExtremeOffset( $id, 'min' );
 385         }
 386
 387         /** @todo document */
 388         function getExtremeOffset( $id, $func ) {
 389                 $db =& wfGetDB(DB_SLAVE);
 390                 return $db->selectField( 'revision',
 391                         "$func(rev_timestamp)",
 392                         array( 'rev_page' => $id ),
 393                         'PageHistory::getExtremeOffset' );
 394         }
 395
 396         /** @todo document */
 397         function getLatestId() {
 398                 if( is_null( $this->mLatestId ) ) {
 399                         $id = $this->mTitle->getArticleID();
 400                         $db =& wfGetDB(DB_SLAVE);
 401                         $this->mLatestId = $db->selectField( 'revision',
 402                                 "max(rev_id)",
 403                                 array( 'rev_page' => $id ),
 404                                 'PageHistory::getLatestID' );
 405                 }
 406                 return $this->mLatestId;
 407         }
 408
 409         /** @todo document */
 410         function getLastOffsetForPaging( $id, $step ) {
 411                 $fname = 'PageHistory::getLastOffsetForPaging';
 412
 413                 $dbr =& wfGetDB(DB_SLAVE);
 414                 $res = $dbr->select(
 415                         'revision',
 416                         'rev_timestamp',
 417                         "rev_page=$id",
 418                         $fname,
 419                         array('ORDER BY' => 'rev_timestamp ASC', 'LIMIT' => $step));
 420
 421                 $n = $dbr->numRows( $res );
 422                 $last = null;
 423                 while( $obj = $dbr->fetchObject( $res ) ) {
 424                         $last = $obj->rev_timestamp;
 425                 }
 426                 $dbr->freeResult( $res );
 427                 return $last;
 428         }
 429
 430         /**
 431          * @return returns the direction of browsing watchlist
 432          */
 433         function getDirection() {
 434                 global $wgRequest;
 435                 if ($wgRequest->getText("dir") == "prev")
 436                         return PageHistory::DIR_PREV;
 437                 else
 438                         return PageHistory::DIR_NEXT;
 439         }
 440
 441         /** @todo document */
 442         function fetchRevisions($limit, $offset, $direction) {
 443                 $fname = 'PageHistory::fetchRevisions';
 444
 445                 $dbr =& wfGetDB( DB_SLAVE );
 446
 447                 if ($direction == PageHistory::DIR_PREV)
 448                         list($dirs, $oper) = array("ASC", ">=");
 449                 else /* $direction == PageHistory::DIR_NEXT */
 450                         list($dirs, $oper) = array("DESC", "<=");
 451
 452                 if ($offset)
 453                         $offsets = array("rev_timestamp $oper '$offset'");
 454                 else
 455                         $offsets = array();
 456
 457                 $page_id = $this->mTitle->getArticleID();
 458
 459                 $res = $dbr->select(
 460                         'revision',
 461                         array('rev_id', 'rev_page', 'rev_text_id', 'rev_user', 'rev_comment', 'rev_user_text',
 462                                 'rev_timestamp', 'rev_minor_edit', 'rev_deleted'),
 463                         array_merge(array("rev_page=$page_id"), $offsets),
 464                         $fname,
 465                         array('ORDER BY' => "rev_timestamp $dirs",
 466                                 'USE INDEX' => 'page_timestamp', 'LIMIT' => $limit)
 467                         );
 468
 469                 $result = array();
 470                 while (($obj = $dbr->fetchObject($res)) != NULL)
 471                         $result[] = $obj;
 472
 473                 return $result;
 474         }
 475
 476         /** @todo document */
 477         function getNotificationTimestamp() {
 478                 global $wgUser, $wgShowUpdatedMarker;
 479                 $fname = 'PageHistory::getNotficationTimestamp';
 480
 481                 if ($this->mNotificationTimestamp !== NULL)
 482                         return $this->mNotificationTimestamp;
 483
 484                 if ($wgUser->isAnon() || !$wgShowUpdatedMarker)
 485                         return $this->mNotificationTimestamp = false;
 486
 487                 $dbr =& wfGetDB(DB_SLAVE);
 488
 489                 $this->mNotificationTimestamp = $dbr->selectField(
 490                         'watchlist',
 491                         'wl_notificationtimestamp',
 492                         array(  'wl_namespace' => $this->mTitle->getNamespace(),
 493                                 'wl_title' => $this->mTitle->getDBkey(),
 494                                 'wl_user' => $wgUser->getID()
 495                         ),
 496                         $fname);
 497
 498                 // Don't use the special value reserved for telling whether the field is filled
 499                 if ( is_null( $this->mNotificationTimestamp ) ) {
 500                         $this->mNotificationTimestamp = false;
 501                 }
 502
 503                 return $this->mNotificationTimestamp;
 504         }
 505
 506         /** @todo document */
 507         function makeNavbar($revisions, $offset, $limit, $direction) {
 508                 global $wgLang;
 509
 510                 $revisions = array_slice($revisions, 0, $limit);
 511
 512                 $latestTimestamp = wfTimestamp(TS_MW, $this->getLatestOffset());
 513                 $earliestTimestamp = wfTimestamp(TS_MW, $this->getEarliestOffset());
 514
 515                 /*
 516                  * When we're displaying previous revisions, we need to reverse
 517                  * the array, because it's queried in reverse order.
 518                  */
 519                 if ($direction == PageHistory::DIR_PREV)
 520                         $revisions = array_reverse($revisions);
 521
 522                 /*
 523                  * lowts is the timestamp of the first revision on this page.
 524                  * hights is the timestamp of the last revision.
 525                  */
 526
 527                 $lowts = $hights = 0;
 528
 529                 if( count( $revisions ) ) {
 530                         $latestShown = wfTimestamp(TS_MW, $revisions[0]->rev_timestamp);
 531                         $earliestShown = wfTimestamp(TS_MW, $revisions[count($revisions) - 1]->rev_timestamp);
 532                 }
 533
 534                 /* Don't announce the limit everywhere if it's the default */
 535                 $usefulLimit = $limit == $this->defaultLimit ? '' : $limit;
 536
 537                 $urls = array();
 538                 foreach (array(20, 50, 100, 250, 500) as $num) {
 539                         $urls[] = $this->MakeLink( $wgLang->formatNum($num),
 540                                 array('offset' => $offset == 0 ? '' : wfTimestamp(TS_MW, $offset), 'limit' => $num, ) );
 541                 }
 542
 543                 $bits = implode($urls, ' | ');
 544
 545                 wfDebug("latestShown=$latestShown latestTimestamp=$latestTimestamp\n");
 546                 if( $latestShown < $latestTimestamp ) {
 547                         $prevtext = $this->MakeLink( wfMsgHtml("prevn", $limit),
 548                                 array( 'dir' => 'prev', 'offset' => $latestShown, 'limit' => $usefulLimit ) );
 549                         $lasttext = $this->MakeLink( wfMsgHtml('histlast'),
 550                                 array( 'limit' => $usefulLimit ) );
 551                 } else {
 552                         $prevtext = wfMsgHtml("prevn", $limit);
 553                         $lasttext = wfMsgHtml('histlast');
 554                 }
 555
 556                 wfDebug("earliestShown=$earliestShown earliestTimestamp=$earliestTimestamp\n");
 557                 if( $earliestShown > $earliestTimestamp ) {
 558                         $nexttext = $this->MakeLink( wfMsgHtml("nextn", $limit),
 559                                 array( 'offset' => $earliestShown, 'limit' => $usefulLimit ) );
 560                         $firsttext = $this->MakeLink( wfMsgHtml('histfirst'),
 561                                 array( 'go' => 'first', 'limit' => $usefulLimit ) );
 562                 } else {
 563                         $nexttext = wfMsgHtml("nextn", $limit);
 564                         $firsttext = wfMsgHtml('histfirst');
 565                 }
 566
 567                 $firstlast = "($lasttext | $firsttext)";
 568
 569                 return "$firstlast " . wfMsgHtml("viewprevnext", $prevtext, $nexttext, $bits);
 570         }
 571
 572         function MakeLink($text, $query = NULL) {
 573                 if ( $query === null ) return $text;
 574                 return $this->mSkin->makeKnownLinkObj(
 575                                 $this->mTitle, $text,
 576                                 wfArrayToCGI( $query, array( 'action' => 'history' )));
 577         }
 578
 579
 580         /**
 581          * Output a subscription feed listing recent edits to this page.
 582          * @param string $type
 583          */
 584         function feed( $type ) {
 585                 require_once 'SpecialRecentchanges.php';
 586
 587                 global $wgFeedClasses;
 588                 if( !isset( $wgFeedClasses[$type] ) ) {
 589                         global $wgOut;
 590                         $wgOut->addWikiText( wfMsg( 'feed-invalid' ) );
 591                         return;
 592                 }
 593
 594                 $feed = new $wgFeedClasses[$type](
 595                         $this->mTitle->getPrefixedText() . ' - ' .
 596                                 wfMsgForContent( 'history-feed-title' ),
 597                         wfMsgForContent( 'history-feed-description' ),
 598                         $this->mTitle->getFullUrl( 'action=history' ) );
 599
 600                 $items = $this->fetchRevisions(10, 0, PageHistory::DIR_NEXT);
 601                 $feed->outHeader();
 602                 if( $items ) {
 603                         foreach( $items as $row ) {
 604                                 $feed->outItem( $this->feedItem( $row ) );
 605                         }
 606                 } else {
 607                         $feed->outItem( $this->feedEmpty() );
 608                 }
 609                 $feed->outFooter();
 610         }
 611
 612         function feedEmpty() {
 613                 global $wgOut;
 614                 return new FeedItem(
 615                         wfMsgForContent( 'nohistory' ),
 616                         $wgOut->parse( wfMsgForContent( 'history-feed-empty' ) ),
 617                         $this->mTitle->getFullUrl(),
 618                         wfTimestamp( TS_MW ),
 619                         '',
 620                         $this->mTitle->getTalkPage()->getFullUrl() );
 621         }
 622
 623         /**
 624          * Generate a FeedItem object from a given revision table row
 625          * Borrows Recent Changes' feed generation functions for formatting;
 626          * includes a diff to the previous revision (if any).
 627          *
 628          * @param $row
 629          * @return FeedItem
 630          */
 631         function feedItem( $row ) {
 632                 $rev = new Revision( $row );
 633                 $rev->setTitle( $this->mTitle );
 634                 $text = rcFormatDiffRow( $this->mTitle,
 635                         $this->mTitle->getPreviousRevisionID( $rev->getId() ),
 636                         $rev->getId(),
 637                         $rev->getTimestamp(),
 638                         $rev->getComment() );
 639
 640                 if( $rev->getComment() == '' ) {
 641                         global $wgContLang;
 642                         $title = wfMsgForContent( 'history-feed-item-nocomment',
 643                                 $rev->getUserText(),
 644                                 $wgContLang->timeanddate( $rev->getTimestamp() ) );
 645                 } else {
 646                         $title = $rev->getUserText() . ": " . $this->stripComment( $rev->getComment() );
 647                 }
 648
 649                 return new FeedItem(
 650                         $title,
 651                         $text,
 652                         $this->mTitle->getFullUrl( 'diff=' . $rev->getId() . '&oldid=prev' ),
 653                         $rev->getTimestamp(),
 654                         $rev->getUserText(),
 655                         $this->mTitle->getTalkPage()->getFullUrl() );
 656         }
 657
 658         /**
 659          * Quickie hack... strip out wikilinks to more legible form from the comment.
 660          */
 661         function stripComment( $text ) {
 662                 return preg_replace( '/\[\[([^]]*\|)?([^]]+)\]\]/', '\2', $text );
 663         }
 664
 665
 666 }
 667
 668 ?>