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                 if ( $limit <= 0 ) {
  99                         $limit = $this->defaultLimit;
 100                 } elseif ( $limit > 50000 ) {
 101                         # Arbitrary maximum
 102                         # Any more than this and we'll probably get an out of memory error
 103                         $limit = 50000;
 104                 }
 105
 106                 $offset = $wgRequest->getText('offset');
 107
 108                 /* Offset must be an integral. */
 109                 if (!strlen($offset) || !preg_match("/^[0-9]+$/", $offset))
 110                         $offset = 0;
 111 #               $offset = $dbr->timestamp($offset);
 112                 $dboffset = $offset === 0 ? 0 : $dbr->timestamp($offset);
 113                 /*
 114                  * "go=last" means to jump to the last history page.
 115                  */
 116                 if (($gowhere = $wgRequest->getText("go")) !== NULL) {
 117                         $gourl = null;
 118                         switch ($gowhere) {
 119                         case "first":
 120                                 if (($lastid = $this->getLastOffsetForPaging($this->mTitle->getArticleID(), $limit)) === NULL)
 121                                         break;
 122                                 $gourl = $wgTitle->getLocalURL("action=history&limit={$limit}&offset=".
 123                                                 wfTimestamp(TS_MW, $lastid));
 124                                 break;
 125                         }
 126
 127                         if (!is_null($gourl)) {
 128                                 $wgOut->redirect($gourl);
 129                                 return;
 130                         }
 131                 }
 132
 133                 /*
 134                  * Fetch revisions.
 135                  *
 136                  * If the user clicked "previous", we retrieve the revisions backwards,
 137                  * then reverse them.  This is to avoid needing to know the timestamp of
 138                  * previous revisions when generating the URL.
 139                  */
 140                 $direction = $this->getDirection();
 141                 $revisions = $this->fetchRevisions($limit, $dboffset, $direction);
 142                 $navbar = $this->makeNavbar($revisions, $offset, $limit, $direction);
 143
 144                 /*
 145                  * We fetch one more revision than needed to get the timestamp of the
 146                  * one after this page (and to know if it exists).
 147                  *
 148                  * linesonpage stores the actual number of lines.
 149                  */
 150                 if (count($revisions) < $limit + 1)
 151                         $this->linesonpage = count($revisions);
 152                 else
 153                         $this->linesonpage = count($revisions) - 1;
 154
 155                 /* Un-reverse revisions */
 156                 if ($direction == PageHistory::DIR_PREV)
 157                         $revisions = array_reverse($revisions);
 158
 159                 /*
 160                  * Print the top navbar.
 161                  */
 162                 $s = $navbar;
 163                 $s .= $this->beginHistoryList();
 164                 $counter = 1;
 165
 166                 /*
 167                  * Print each revision, excluding the one-past-the-end, if any.
 168                  */
 169                 foreach (array_slice($revisions, 0, $limit) as $i => $line) {
 170                         $latest = !$i && $offset == 0;
 171                         $firstInList = !$i;
 172                         $next = isset( $revisions[$i + 1] ) ? $revisions[$i + 1 ] : null;
 173                         $s .= $this->historyLine($line, $next, $counter, $this->getNotificationTimestamp(), $latest, $firstInList);
 174                         $counter++;
 175                 }
 176
 177                 /*
 178                  * End navbar.
 179                 */
 180                 $s .= $this->endHistoryList();
 181                 $s .= $navbar;
 182
 183                 $wgOut->addHTML( $s );
 184                 wfProfileOut( $fname );
 185         }
 186
 187         /** @todo document */
 188         function beginHistoryList() {
 189                 global $wgTitle;
 190                 $this->lastdate = '';
 191                 $s = wfMsgExt( 'histlegend', array( 'parse') );
 192                 $s .= '<form action="' . $wgTitle->escapeLocalURL( '-' ) . '" method="get">';
 193                 $prefixedkey = htmlspecialchars($wgTitle->getPrefixedDbKey());
 194
 195                 // The following line is SUPPOSED to have double-quotes around the
 196                 // $prefixedkey variable, because htmlspecialchars() doesn't escape
 197                 // single-quotes.
 198                 //
 199                 // On at least two occasions people have changed it to single-quotes,
 200                 // which creates invalid HTML and incorrect display of the resulting
 201                 // link.
 202                 //
 203                 // Please do not break this a third time. Thank you for your kind
 204                 // consideration and cooperation.
 205                 //
 206                 $s .= "<input type='hidden' name='title' value=\"{$prefixedkey}\" />\n";
 207
 208                 $s .= $this->submitButton();
 209                 $s .= '<ul id="pagehistory">' . "\n";
 210                 return $s;
 211         }
 212
 213         /** @todo document */
 214         function endHistoryList() {
 215                 $s = '</ul>';
 216                 $s .= $this->submitButton( array( 'id' => 'historysubmit' ) );
 217                 $s .= '</form>';
 218                 return $s;
 219         }
 220
 221         /** @todo document */
 222         function submitButton( $bits = array() ) {
 223                 return ( $this->linesonpage > 0 )
 224                         ? wfElement( 'input', array_merge( $bits,
 225                                 array(
 226                                         'class'     => 'historysubmit',
 227                                         'type'      => 'submit',
 228                                         'accesskey' => wfMsg( 'accesskey-compareselectedversions' ),
 229                                         'title'     => wfMsg( 'tooltip-compareselectedversions' ),
 230                                         'value'     => wfMsg( 'compareselectedversions' ),
 231                                 ) ) )
 232                         : '';
 233         }
 234
 235         /** @todo document */
 236         function historyLine( $row, $next, $counter = '', $notificationtimestamp = false, $latest = false, $firstInList = false ) {
 237                 global $wgUser;
 238                 $rev = new Revision( $row );
 239                 $rev->setTitle( $this->mTitle );
 240
 241                 $s = '<li>';
 242                 $curlink = $this->curLink( $rev, $latest );
 243                 $lastlink = $this->lastLink( $rev, $next, $counter );
 244                 $arbitrary = $this->diffButtons( $rev, $firstInList, $counter );
 245                 $link = $this->revLink( $rev );
 246
 247                 $user = $this->mSkin->userLink( $rev->getUser(), $rev->getUserText() )
 248                                 . $this->mSkin->userToolLinks( $rev->getUser(), $rev->getUserText() );
 249
 250                 $s .= "($curlink) ($lastlink) $arbitrary";
 251
 252                 if( $wgUser->isAllowed( 'deleterevision' ) ) {
 253                         $revdel = Title::makeTitle( NS_SPECIAL, 'Revisiondelete' );
 254                         if( $firstInList ) {
 255                                 // We don't currently handle well changing the top revision's settings
 256                                 $del = wfMsgHtml( 'rev-delundel' );
 257                         } else {
 258                                 $del = $this->mSkin->makeKnownLinkObj( $revdel,
 259                                         wfMsg( 'rev-delundel' ),
 260                                         'target=' . urlencode( $this->mTitle->getPrefixedDbkey() ) .
 261                                         '&oldid=' . urlencode( $rev->getId() ) );
 262                         }
 263                         $s .= "(<small>$del</small>) ";
 264                 }
 265
 266                 $s .= " $link <span class='history-user'>$user</span>";
 267
 268                 if( $row->rev_minor_edit ) {
 269                         $s .= ' ' . wfElement( 'span', array( 'class' => 'minor' ), wfMsg( 'minoreditletter') );
 270                 }
 271
 272                 $s .= $this->mSkin->revComment( $rev );
 273                 if ($notificationtimestamp && ($row->rev_timestamp >= $notificationtimestamp)) {
 274                         $s .= ' <span class="updatedmarker">' .  wfMsgHtml( 'updatedmarker' ) . '</span>';
 275                 }
 276                 if( $row->rev_deleted & Revision::DELETED_TEXT ) {
 277                         $s .= ' ' . wfMsgHtml( 'deletedrev' );
 278                 }
 279                 $s .= "</li>\n";
 280
 281                 return $s;
 282         }
 283
 284         /** @todo document */
 285         function revLink( $rev ) {
 286                 global $wgLang;
 287                 $date = $wgLang->timeanddate( wfTimestamp(TS_MW, $rev->getTimestamp()), true );
 288                 if( $rev->userCan( Revision::DELETED_TEXT ) ) {
 289                         $link = $this->mSkin->makeKnownLinkObj(
 290                                 $this->mTitle, $date, "oldid=" . $rev->getId() );
 291                 } else {
 292                         $link = $date;
 293                 }
 294                 if( $rev->isDeleted( Revision::DELETED_TEXT ) ) {
 295                         return '<span class="history-deleted">' . $link . '</span>';
 296                 }
 297                 return $link;
 298         }
 299
 300         /** @todo document */
 301         function curLink( $rev, $latest ) {
 302                 $cur = wfMsgExt( 'cur', array( 'escape') );
 303                 if( $latest || !$rev->userCan( Revision::DELETED_TEXT ) ) {
 304                         return $cur;
 305                 } else {
 306                         return $this->mSkin->makeKnownLinkObj(
 307                                 $this->mTitle, $cur,
 308                                 'diff=' . $this->getLatestID() .
 309                                 "&oldid=" . $rev->getId() );
 310                 }
 311         }
 312
 313         /** @todo document */
 314         function lastLink( $rev, $next, $counter ) {
 315                 $last = wfMsgExt( 'last', array( 'escape' ) );
 316                 if( is_null( $next ) ) {
 317                         if( $rev->getTimestamp() == $this->getEarliestOffset() ) {
 318                                 return $last;
 319                         } else {
 320                                 // Cut off by paging; there are more behind us...
 321                                 return $this->mSkin->makeKnownLinkObj(
 322                                         $this->mTitle,
 323                                         $last,
 324                                         "diff=" . $rev->getId() . "&oldid=prev" );
 325                         }
 326                 } elseif( !$rev->userCan( Revision::DELETED_TEXT ) ) {
 327                         return $last;
 328                 } else {
 329                         return $this->mSkin->makeKnownLinkObj(
 330                                 $this->mTitle,
 331                                 $last,
 332                                 "diff=" . $rev->getId() . "&oldid={$next->rev_id}"
 333                                 /*,
 334                                 '',
 335                                 '',
 336                                 "tabindex={$counter}"*/ );
 337                 }
 338         }
 339
 340         /** @todo document */
 341         function diffButtons( $rev, $firstInList, $counter ) {
 342                 if( $this->linesonpage > 1) {
 343                         $radio = array(
 344                                 'type'  => 'radio',
 345                                 'value' => $rev->getId(),
 346 # do we really need to flood this on every item?
 347 #                               'title' => wfMsgHtml( 'selectolderversionfordiff' )
 348                         );
 349
 350                         if( !$rev->userCan( Revision::DELETED_TEXT ) ) {
 351                                 $radio['disabled'] = 'disabled';
 352                         }
 353
 354                         /** @todo: move title texts to javascript */
 355                         if ( $firstInList ) {
 356                                 $first = wfElement( 'input', array_merge(
 357                                         $radio,
 358                                         array(
 359                                                 'style' => 'visibility:hidden',
 360                                                 'name'  => 'oldid' ) ) );
 361                                 $checkmark = array( 'checked' => 'checked' );
 362                         } else {
 363                                 if( $counter == 2 ) {
 364                                         $checkmark = array( 'checked' => 'checked' );
 365                                 } else {
 366                                         $checkmark = array();
 367                                 }
 368                                 $first = wfElement( 'input', array_merge(
 369                                         $radio,
 370                                         $checkmark,
 371                                         array( 'name'  => 'oldid' ) ) );
 372                                 $checkmark = array();
 373                         }
 374                         $second = wfElement( 'input', array_merge(
 375                                 $radio,
 376                                 $checkmark,
 377                                 array( 'name'  => 'diff' ) ) );
 378                         return $first . $second;
 379                 } else {
 380                         return '';
 381                 }
 382         }
 383
 384         /** @todo document */
 385         function getLatestOffset( $id = null ) {
 386                 if ( $id === null) $id = $this->mTitle->getArticleID();
 387                 return $this->getExtremeOffset( $id, 'max' );
 388         }
 389
 390         /** @todo document */
 391         function getEarliestOffset( $id = null ) {
 392                 if ( $id === null) $id = $this->mTitle->getArticleID();
 393                 return $this->getExtremeOffset( $id, 'min' );
 394         }
 395
 396         /** @todo document */
 397         function getExtremeOffset( $id, $func ) {
 398                 $db =& wfGetDB(DB_SLAVE);
 399                 return $db->selectField( 'revision',
 400                         "$func(rev_timestamp)",
 401                         array( 'rev_page' => $id ),
 402                         'PageHistory::getExtremeOffset' );
 403         }
 404
 405         /** @todo document */
 406         function getLatestId() {
 407                 if( is_null( $this->mLatestId ) ) {
 408                         $id = $this->mTitle->getArticleID();
 409                         $db =& wfGetDB(DB_SLAVE);
 410                         $this->mLatestId = $db->selectField( 'revision',
 411                                 "max(rev_id)",
 412                                 array( 'rev_page' => $id ),
 413                                 'PageHistory::getLatestID' );
 414                 }
 415                 return $this->mLatestId;
 416         }
 417
 418         /** @todo document */
 419         function getLastOffsetForPaging( $id, $step ) {
 420                 $fname = 'PageHistory::getLastOffsetForPaging';
 421
 422                 $dbr =& wfGetDB(DB_SLAVE);
 423                 $res = $dbr->select(
 424                         'revision',
 425                         'rev_timestamp',
 426                         "rev_page=$id",
 427                         $fname,
 428                         array('ORDER BY' => 'rev_timestamp ASC', 'LIMIT' => $step));
 429
 430                 $n = $dbr->numRows( $res );
 431                 $last = null;
 432                 while( $obj = $dbr->fetchObject( $res ) ) {
 433                         $last = $obj->rev_timestamp;
 434                 }
 435                 $dbr->freeResult( $res );
 436                 return $last;
 437         }
 438
 439         /**
 440          * @return returns the direction of browsing watchlist
 441          */
 442         function getDirection() {
 443                 global $wgRequest;
 444                 if ($wgRequest->getText("dir") == "prev")
 445                         return PageHistory::DIR_PREV;
 446                 else
 447                         return PageHistory::DIR_NEXT;
 448         }
 449
 450         /** @todo document */
 451         function fetchRevisions($limit, $offset, $direction) {
 452                 $fname = 'PageHistory::fetchRevisions';
 453
 454                 $dbr =& wfGetDB( DB_SLAVE );
 455
 456                 if ($direction == PageHistory::DIR_PREV)
 457                         list($dirs, $oper) = array("ASC", ">=");
 458                 else /* $direction == PageHistory::DIR_NEXT */
 459                         list($dirs, $oper) = array("DESC", "<=");
 460
 461                 if ($offset)
 462                         $offsets = array("rev_timestamp $oper '$offset'");
 463                 else
 464                         $offsets = array();
 465
 466                 $page_id = $this->mTitle->getArticleID();
 467
 468                 $res = $dbr->select(
 469                         'revision',
 470                         array('rev_id', 'rev_page', 'rev_text_id', 'rev_user', 'rev_comment', 'rev_user_text',
 471                                 'rev_timestamp', 'rev_minor_edit', 'rev_deleted'),
 472                         array_merge(array("rev_page=$page_id"), $offsets),
 473                         $fname,
 474                         array('ORDER BY' => "rev_timestamp $dirs",
 475                                 'USE INDEX' => 'page_timestamp', 'LIMIT' => $limit)
 476                         );
 477
 478                 $result = array();
 479                 while (($obj = $dbr->fetchObject($res)) != NULL)
 480                         $result[] = $obj;
 481
 482                 return $result;
 483         }
 484
 485         /** @todo document */
 486         function getNotificationTimestamp() {
 487                 global $wgUser, $wgShowUpdatedMarker;
 488                 $fname = 'PageHistory::getNotficationTimestamp';
 489
 490                 if ($this->mNotificationTimestamp !== NULL)
 491                         return $this->mNotificationTimestamp;
 492
 493                 if ($wgUser->isAnon() || !$wgShowUpdatedMarker)
 494                         return $this->mNotificationTimestamp = false;
 495
 496                 $dbr =& wfGetDB(DB_SLAVE);
 497
 498                 $this->mNotificationTimestamp = $dbr->selectField(
 499                         'watchlist',
 500                         'wl_notificationtimestamp',
 501                         array(  'wl_namespace' => $this->mTitle->getNamespace(),
 502                                 'wl_title' => $this->mTitle->getDBkey(),
 503                                 'wl_user' => $wgUser->getID()
 504                         ),
 505                         $fname);
 506
 507                 // Don't use the special value reserved for telling whether the field is filled
 508                 if ( is_null( $this->mNotificationTimestamp ) ) {
 509                         $this->mNotificationTimestamp = false;
 510                 }
 511
 512                 return $this->mNotificationTimestamp;
 513         }
 514
 515         /** @todo document */
 516         function makeNavbar($revisions, $offset, $limit, $direction) {
 517                 global $wgLang;
 518
 519                 $revisions = array_slice($revisions, 0, $limit);
 520
 521                 $latestTimestamp = wfTimestamp(TS_MW, $this->getLatestOffset());
 522                 $earliestTimestamp = wfTimestamp(TS_MW, $this->getEarliestOffset());
 523
 524                 /*
 525                  * When we're displaying previous revisions, we need to reverse
 526                  * the array, because it's queried in reverse order.
 527                  */
 528                 if ($direction == PageHistory::DIR_PREV)
 529                         $revisions = array_reverse($revisions);
 530
 531                 /*
 532                  * lowts is the timestamp of the first revision on this page.
 533                  * hights is the timestamp of the last revision.
 534                  */
 535
 536                 $lowts = $hights = 0;
 537
 538                 if( count( $revisions ) ) {
 539                         $latestShown = wfTimestamp(TS_MW, $revisions[0]->rev_timestamp);
 540                         $earliestShown = wfTimestamp(TS_MW, $revisions[count($revisions) - 1]->rev_timestamp);
 541                 } else {
 542                         $latestShown = null;
 543                         $earliestShown = null;
 544                 }
 545
 546                 /* Don't announce the limit everywhere if it's the default */
 547                 $usefulLimit = $limit == $this->defaultLimit ? '' : $limit;
 548
 549                 $urls = array();
 550                 foreach (array(20, 50, 100, 250, 500) as $num) {
 551                         $urls[] = $this->MakeLink( $wgLang->formatNum($num),
 552                                 array('offset' => $offset == 0 ? '' : wfTimestamp(TS_MW, $offset), 'limit' => $num, ) );
 553                 }
 554
 555                 $bits = implode($urls, ' | ');
 556
 557                 wfDebug("latestShown=$latestShown latestTimestamp=$latestTimestamp\n");
 558                 if( $latestShown < $latestTimestamp ) {
 559                         $prevtext = $this->MakeLink( wfMsgHtml("prevn", $limit),
 560                                 array( 'dir' => 'prev', 'offset' => $latestShown, 'limit' => $usefulLimit ) );
 561                         $lasttext = $this->MakeLink( wfMsgHtml('histlast'),
 562                                 array( 'limit' => $usefulLimit ) );
 563                 } else {
 564                         $prevtext = wfMsgHtml("prevn", $limit);
 565                         $lasttext = wfMsgHtml('histlast');
 566                 }
 567
 568                 wfDebug("earliestShown=$earliestShown earliestTimestamp=$earliestTimestamp\n");
 569                 if( $earliestShown > $earliestTimestamp ) {
 570                         $nexttext = $this->MakeLink( wfMsgHtml("nextn", $limit),
 571                                 array( 'offset' => $earliestShown, 'limit' => $usefulLimit ) );
 572                         $firsttext = $this->MakeLink( wfMsgHtml('histfirst'),
 573                                 array( 'go' => 'first', 'limit' => $usefulLimit ) );
 574                 } else {
 575                         $nexttext = wfMsgHtml("nextn", $limit);
 576                         $firsttext = wfMsgHtml('histfirst');
 577                 }
 578
 579                 $firstlast = "($lasttext | $firsttext)";
 580
 581                 return "$firstlast " . wfMsgHtml("viewprevnext", $prevtext, $nexttext, $bits);
 582         }
 583
 584         function MakeLink($text, $query = NULL) {
 585                 if ( $query === null ) return $text;
 586                 return $this->mSkin->makeKnownLinkObj(
 587                                 $this->mTitle, $text,
 588                                 wfArrayToCGI( $query, array( 'action' => 'history' )));
 589         }
 590
 591
 592         /**
 593          * Output a subscription feed listing recent edits to this page.
 594          * @param string $type
 595          */
 596         function feed( $type ) {
 597                 require_once 'SpecialRecentchanges.php';
 598
 599                 global $wgFeedClasses;
 600                 if( !isset( $wgFeedClasses[$type] ) ) {
 601                         global $wgOut;
 602                         $wgOut->addWikiText( wfMsg( 'feed-invalid' ) );
 603                         return;
 604                 }
 605
 606                 $feed = new $wgFeedClasses[$type](
 607                         $this->mTitle->getPrefixedText() . ' - ' .
 608                                 wfMsgForContent( 'history-feed-title' ),
 609                         wfMsgForContent( 'history-feed-description' ),
 610                         $this->mTitle->getFullUrl( 'action=history' ) );
 611
 612                 $items = $this->fetchRevisions(10, 0, PageHistory::DIR_NEXT);
 613                 $feed->outHeader();
 614                 if( $items ) {
 615                         foreach( $items as $row ) {
 616                                 $feed->outItem( $this->feedItem( $row ) );
 617                         }
 618                 } else {
 619                         $feed->outItem( $this->feedEmpty() );
 620                 }
 621                 $feed->outFooter();
 622         }
 623
 624         function feedEmpty() {
 625                 global $wgOut;
 626                 return new FeedItem(
 627                         wfMsgForContent( 'nohistory' ),
 628                         $wgOut->parse( wfMsgForContent( 'history-feed-empty' ) ),
 629                         $this->mTitle->getFullUrl(),
 630                         wfTimestamp( TS_MW ),
 631                         '',
 632                         $this->mTitle->getTalkPage()->getFullUrl() );
 633         }
 634
 635         /**
 636          * Generate a FeedItem object from a given revision table row
 637          * Borrows Recent Changes' feed generation functions for formatting;
 638          * includes a diff to the previous revision (if any).
 639          *
 640          * @param $row
 641          * @return FeedItem
 642          */
 643         function feedItem( $row ) {
 644                 $rev = new Revision( $row );
 645                 $rev->setTitle( $this->mTitle );
 646                 $text = rcFormatDiffRow( $this->mTitle,
 647                         $this->mTitle->getPreviousRevisionID( $rev->getId() ),
 648                         $rev->getId(),
 649                         $rev->getTimestamp(),
 650                         $rev->getComment() );
 651
 652                 if( $rev->getComment() == '' ) {
 653                         global $wgContLang;
 654                         $title = wfMsgForContent( 'history-feed-item-nocomment',
 655                                 $rev->getUserText(),
 656                                 $wgContLang->timeanddate( $rev->getTimestamp() ) );
 657                 } else {
 658                         $title = $rev->getUserText() . ": " . $this->stripComment( $rev->getComment() );
 659                 }
 660
 661                 return new FeedItem(
 662                         $title,
 663                         $text,
 664                         $this->mTitle->getFullUrl( 'diff=' . $rev->getId() . '&oldid=prev' ),
 665                         $rev->getTimestamp(),
 666                         $rev->getUserText(),
 667                         $this->mTitle->getTalkPage()->getFullUrl() );
 668         }
 669
 670         /**
 671          * Quickie hack... strip out wikilinks to more legible form from the comment.
 672          */
 673         function stripComment( $text ) {
 674                 return preg_replace( '/\[\[([^]]*\|)?([^]]+)\]\]/', '\2', $text );
 675         }
 676
 677
 678 }
 679
 680 ?>