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->setArticleFlag( false );
  71                 $wgOut->setArticleRelated( true );
  72                 $wgOut->setRobotpolicy( 'noindex,nofollow' );
  73                 $wgOut->setSyndicated( true );
  74
  75                 $logPage = Title::makeTitle( NS_SPECIAL, 'Log' );
  76                 $logLink = $this->mSkin->makeKnownLinkObj( $logPage, wfMsgHtml( 'viewpagelogs' ), 'page=' . $this->mTitle->getPrefixedUrl() );
  77
  78                 $subtitle = wfMsgHtml( 'revhistory' ) . '<br />' . $logLink;
  79                 $wgOut->setSubtitle( $subtitle );
  80
  81                 $feedType = $wgRequest->getVal( 'feed' );
  82                 if( $feedType ) {
  83                         wfProfileOut( $fname );
  84                         return $this->feed( $feedType );
  85                 }
  86
  87                 /*
  88                  * Fail if article doesn't exist.
  89                  */
  90                 if( !$this->mTitle->exists() ) {
  91                         $wgOut->addWikiText( wfMsg( 'nohistory' ) );
  92                         wfProfileOut( $fname );
  93                         return;
  94                 }
  95
  96                 $dbr =& wfGetDB(DB_SLAVE);
  97
  98                 /*
  99                  * Extract limit, the number of revisions to show, and
 100                  * offset, the timestamp to begin at, from the URL.
 101                  */
 102                 $limit = $wgRequest->getInt('limit', $this->defaultLimit);
 103                 if ( $limit <= 0 ) {
 104                         $limit = $this->defaultLimit;
 105                 } elseif ( $limit > 50000 ) {
 106                         # Arbitrary maximum
 107                         # Any more than this and we'll probably get an out of memory error
 108                         $limit = 50000;
 109                 }
 110
 111                 $offset = $wgRequest->getText('offset');
 112
 113                 /* Offset must be an integral. */
 114                 if (!strlen($offset) || !preg_match("/^[0-9]+$/", $offset))
 115                         $offset = 0;
 116 #               $offset = $dbr->timestamp($offset);
 117                 $dboffset = $offset === 0 ? 0 : $dbr->timestamp($offset);
 118                 /*
 119                  * "go=last" means to jump to the last history page.
 120                  */
 121                 if (($gowhere = $wgRequest->getText("go")) !== NULL) {
 122                         $gourl = null;
 123                         switch ($gowhere) {
 124                         case "first":
 125                                 if (($lastid = $this->getLastOffsetForPaging($this->mTitle->getArticleID(), $limit)) === NULL)
 126                                         break;
 127                                 $gourl = $wgTitle->getLocalURL("action=history&limit={$limit}&offset=".
 128                                                 wfTimestamp(TS_MW, $lastid));
 129                                 break;
 130                         }
 131
 132                         if (!is_null($gourl)) {
 133                                 $wgOut->redirect($gourl);
 134                                 return;
 135                         }
 136                 }
 137
 138                 /*
 139                  * Fetch revisions.
 140                  *
 141                  * If the user clicked "previous", we retrieve the revisions backwards,
 142                  * then reverse them.  This is to avoid needing to know the timestamp of
 143                  * previous revisions when generating the URL.
 144                  */
 145                 $direction = $this->getDirection();
 146                 $revisions = $this->fetchRevisions($limit, $dboffset, $direction);
 147                 $navbar = $this->makeNavbar($revisions, $offset, $limit, $direction);
 148
 149                 /*
 150                  * We fetch one more revision than needed to get the timestamp of the
 151                  * one after this page (and to know if it exists).
 152                  *
 153                  * linesonpage stores the actual number of lines.
 154                  */
 155                 if (count($revisions) < $limit + 1)
 156                         $this->linesonpage = count($revisions);
 157                 else
 158                         $this->linesonpage = count($revisions) - 1;
 159
 160                 /* Un-reverse revisions */
 161                 if ($direction == PageHistory::DIR_PREV)
 162                         $revisions = array_reverse($revisions);
 163
 164                 /*
 165                  * Print the top navbar.
 166                  */
 167                 $s = $navbar;
 168                 $s .= $this->beginHistoryList();
 169                 $counter = 1;
 170
 171                 /*
 172                  * Print each revision, excluding the one-past-the-end, if any.
 173                  */
 174                 foreach (array_slice($revisions, 0, $limit) as $i => $line) {
 175                         $latest = !$i && $offset == 0;
 176                         $firstInList = !$i;
 177                         $next = isset( $revisions[$i + 1] ) ? $revisions[$i + 1 ] : null;
 178                         $s .= $this->historyLine($line, $next, $counter, $this->getNotificationTimestamp(), $latest, $firstInList);
 179                         $counter++;
 180                 }
 181
 182                 /*
 183                  * End navbar.
 184                 */
 185                 $s .= $this->endHistoryList();
 186                 $s .= $navbar;
 187
 188                 $wgOut->addHTML( $s );
 189                 wfProfileOut( $fname );
 190         }
 191
 192         /** @todo document */
 193         function beginHistoryList() {
 194                 global $wgTitle;
 195                 $this->lastdate = '';
 196                 $s = wfMsgExt( 'histlegend', array( 'parse') );
 197                 $s .= '<form action="' . $wgTitle->escapeLocalURL( '-' ) . '" method="get">';
 198                 $prefixedkey = htmlspecialchars($wgTitle->getPrefixedDbKey());
 199
 200                 // The following line is SUPPOSED to have double-quotes around the
 201                 // $prefixedkey variable, because htmlspecialchars() doesn't escape
 202                 // single-quotes.
 203                 //
 204                 // On at least two occasions people have changed it to single-quotes,
 205                 // which creates invalid HTML and incorrect display of the resulting
 206                 // link.
 207                 //
 208                 // Please do not break this a third time. Thank you for your kind
 209                 // consideration and cooperation.
 210                 //
 211                 $s .= "<input type='hidden' name='title' value=\"{$prefixedkey}\" />\n";
 212
 213                 $s .= $this->submitButton();
 214                 $s .= '<ul id="pagehistory">' . "\n";
 215                 return $s;
 216         }
 217
 218         /** @todo document */
 219         function endHistoryList() {
 220                 $s = '</ul>';
 221                 $s .= $this->submitButton( array( 'id' => 'historysubmit' ) );
 222                 $s .= '</form>';
 223                 return $s;
 224         }
 225
 226         /** @todo document */
 227         function submitButton( $bits = array() ) {
 228                 return ( $this->linesonpage > 0 )
 229                         ? wfElement( 'input', array_merge( $bits,
 230                                 array(
 231                                         'class'     => 'historysubmit',
 232                                         'type'      => 'submit',
 233                                         'accesskey' => wfMsg( 'accesskey-compareselectedversions' ),
 234                                         'title'     => wfMsg( 'tooltip-compareselectedversions' ),
 235                                         'value'     => wfMsg( 'compareselectedversions' ),
 236                                 ) ) )
 237                         : '';
 238         }
 239
 240         /** @todo document */
 241         function historyLine( $row, $next, $counter = '', $notificationtimestamp = false, $latest = false, $firstInList = false ) {
 242                 global $wgUser;
 243                 $rev = new Revision( $row );
 244                 $rev->setTitle( $this->mTitle );
 245
 246                 $s = '<li>';
 247                 $curlink = $this->curLink( $rev, $latest );
 248                 $lastlink = $this->lastLink( $rev, $next, $counter );
 249                 $arbitrary = $this->diffButtons( $rev, $firstInList, $counter );
 250                 $link = $this->revLink( $rev );
 251
 252                 $user = $this->mSkin->userLink( $rev->getUser(), $rev->getUserText() )
 253                                 . $this->mSkin->userToolLinks( $rev->getUser(), $rev->getUserText() );
 254
 255                 $s .= "($curlink) ($lastlink) $arbitrary";
 256
 257                 if( $wgUser->isAllowed( 'deleterevision' ) ) {
 258                         $revdel = Title::makeTitle( NS_SPECIAL, 'Revisiondelete' );
 259                         if( $firstInList ) {
 260                                 // We don't currently handle well changing the top revision's settings
 261                                 $del = wfMsgHtml( 'rev-delundel' );
 262                         } else {
 263                                 $del = $this->mSkin->makeKnownLinkObj( $revdel,
 264                                         wfMsg( 'rev-delundel' ),
 265                                         'target=' . urlencode( $this->mTitle->getPrefixedDbkey() ) .
 266                                         '&oldid=' . urlencode( $rev->getId() ) );
 267                         }
 268                         $s .= "(<small>$del</small>) ";
 269                 }
 270
 271                 $s .= " $link <span class='history-user'>$user</span>";
 272
 273                 if( $row->rev_minor_edit ) {
 274                         $s .= ' ' . wfElement( 'span', array( 'class' => 'minor' ), wfMsg( 'minoreditletter') );
 275                 }
 276
 277                 $s .= $this->mSkin->revComment( $rev );
 278                 if ($notificationtimestamp && ($row->rev_timestamp >= $notificationtimestamp)) {
 279                         $s .= ' <span class="updatedmarker">' .  wfMsgHtml( 'updatedmarker' ) . '</span>';
 280                 }
 281                 if( $row->rev_deleted & Revision::DELETED_TEXT ) {
 282                         $s .= ' ' . wfMsgHtml( 'deletedrev' );
 283                 }
 284                 $s .= "</li>\n";
 285
 286                 return $s;
 287         }
 288
 289         /** @todo document */
 290         function revLink( $rev ) {
 291                 global $wgLang;
 292                 $date = $wgLang->timeanddate( wfTimestamp(TS_MW, $rev->getTimestamp()), true );
 293                 if( $rev->userCan( Revision::DELETED_TEXT ) ) {
 294                         $link = $this->mSkin->makeKnownLinkObj(
 295                                 $this->mTitle, $date, "oldid=" . $rev->getId() );
 296                 } else {
 297                         $link = $date;
 298                 }
 299                 if( $rev->isDeleted( Revision::DELETED_TEXT ) ) {
 300                         return '<span class="history-deleted">' . $link . '</span>';
 301                 }
 302                 return $link;
 303         }
 304
 305         /** @todo document */
 306         function curLink( $rev, $latest ) {
 307                 $cur = wfMsgExt( 'cur', array( 'escape') );
 308                 if( $latest || !$rev->userCan( Revision::DELETED_TEXT ) ) {
 309                         return $cur;
 310                 } else {
 311                         return $this->mSkin->makeKnownLinkObj(
 312                                 $this->mTitle, $cur,
 313                                 'diff=' . $this->getLatestID() .
 314                                 "&oldid=" . $rev->getId() );
 315                 }
 316         }
 317
 318         /** @todo document */
 319         function lastLink( $rev, $next, $counter ) {
 320                 $last = wfMsgExt( 'last', array( 'escape' ) );
 321                 if( is_null( $next ) ) {
 322                         if( $rev->getTimestamp() == $this->getEarliestOffset() ) {
 323                                 return $last;
 324                         } else {
 325                                 // Cut off by paging; there are more behind us...
 326                                 return $this->mSkin->makeKnownLinkObj(
 327                                         $this->mTitle,
 328                                         $last,
 329                                         "diff=" . $rev->getId() . "&oldid=prev" );
 330                         }
 331                 } elseif( !$rev->userCan( Revision::DELETED_TEXT ) ) {
 332                         return $last;
 333                 } else {
 334                         return $this->mSkin->makeKnownLinkObj(
 335                                 $this->mTitle,
 336                                 $last,
 337                                 "diff=" . $rev->getId() . "&oldid={$next->rev_id}"
 338                                 /*,
 339                                 '',
 340                                 '',
 341                                 "tabindex={$counter}"*/ );
 342                 }
 343         }
 344
 345         /** @todo document */
 346         function diffButtons( $rev, $firstInList, $counter ) {
 347                 if( $this->linesonpage > 1) {
 348                         $radio = array(
 349                                 'type'  => 'radio',
 350                                 'value' => $rev->getId(),
 351 # do we really need to flood this on every item?
 352 #                               'title' => wfMsgHtml( 'selectolderversionfordiff' )
 353                         );
 354
 355                         if( !$rev->userCan( Revision::DELETED_TEXT ) ) {
 356                                 $radio['disabled'] = 'disabled';
 357                         }
 358
 359                         /** @todo: move title texts to javascript */
 360                         if ( $firstInList ) {
 361                                 $first = wfElement( 'input', array_merge(
 362                                         $radio,
 363                                         array(
 364                                                 'style' => 'visibility:hidden',
 365                                                 'name'  => 'oldid' ) ) );
 366                                 $checkmark = array( 'checked' => 'checked' );
 367                         } else {
 368                                 if( $counter == 2 ) {
 369                                         $checkmark = array( 'checked' => 'checked' );
 370                                 } else {
 371                                         $checkmark = array();
 372                                 }
 373                                 $first = wfElement( 'input', array_merge(
 374                                         $radio,
 375                                         $checkmark,
 376                                         array( 'name'  => 'oldid' ) ) );
 377                                 $checkmark = array();
 378                         }
 379                         $second = wfElement( 'input', array_merge(
 380                                 $radio,
 381                                 $checkmark,
 382                                 array( 'name'  => 'diff' ) ) );
 383                         return $first . $second;
 384                 } else {
 385                         return '';
 386                 }
 387         }
 388
 389         /** @todo document */
 390         function getLatestOffset( $id = null ) {
 391                 if ( $id === null) $id = $this->mTitle->getArticleID();
 392                 return $this->getExtremeOffset( $id, 'max' );
 393         }
 394
 395         /** @todo document */
 396         function getEarliestOffset( $id = null ) {
 397                 if ( $id === null) $id = $this->mTitle->getArticleID();
 398                 return $this->getExtremeOffset( $id, 'min' );
 399         }
 400
 401         /** @todo document */
 402         function getExtremeOffset( $id, $func ) {
 403                 $db =& wfGetDB(DB_SLAVE);
 404                 return $db->selectField( 'revision',
 405                         "$func(rev_timestamp)",
 406                         array( 'rev_page' => $id ),
 407                         'PageHistory::getExtremeOffset' );
 408         }
 409
 410         /** @todo document */
 411         function getLatestId() {
 412                 if( is_null( $this->mLatestId ) ) {
 413                         $id = $this->mTitle->getArticleID();
 414                         $db =& wfGetDB(DB_SLAVE);
 415                         $this->mLatestId = $db->selectField( 'revision',
 416                                 "max(rev_id)",
 417                                 array( 'rev_page' => $id ),
 418                                 'PageHistory::getLatestID' );
 419                 }
 420                 return $this->mLatestId;
 421         }
 422
 423         /** @todo document */
 424         function getLastOffsetForPaging( $id, $step ) {
 425                 $fname = 'PageHistory::getLastOffsetForPaging';
 426
 427                 $dbr =& wfGetDB(DB_SLAVE);
 428                 $res = $dbr->select(
 429                         'revision',
 430                         'rev_timestamp',
 431                         "rev_page=$id",
 432                         $fname,
 433                         array('ORDER BY' => 'rev_timestamp ASC', 'LIMIT' => $step));
 434
 435                 $n = $dbr->numRows( $res );
 436                 $last = null;
 437                 while( $obj = $dbr->fetchObject( $res ) ) {
 438                         $last = $obj->rev_timestamp;
 439                 }
 440                 $dbr->freeResult( $res );
 441                 return $last;
 442         }
 443
 444         /**
 445          * @return returns the direction of browsing watchlist
 446          */
 447         function getDirection() {
 448                 global $wgRequest;
 449                 if ($wgRequest->getText("dir") == "prev")
 450                         return PageHistory::DIR_PREV;
 451                 else
 452                         return PageHistory::DIR_NEXT;
 453         }
 454
 455         /** @todo document */
 456         function fetchRevisions($limit, $offset, $direction) {
 457                 $fname = 'PageHistory::fetchRevisions';
 458
 459                 $dbr =& wfGetDB( DB_SLAVE );
 460
 461                 if ($direction == PageHistory::DIR_PREV)
 462                         list($dirs, $oper) = array("ASC", ">=");
 463                 else /* $direction == PageHistory::DIR_NEXT */
 464                         list($dirs, $oper) = array("DESC", "<=");
 465
 466                 if ($offset)
 467                         $offsets = array("rev_timestamp $oper '$offset'");
 468                 else
 469                         $offsets = array();
 470
 471                 $page_id = $this->mTitle->getArticleID();
 472
 473                 $res = $dbr->select(
 474                         'revision',
 475                         array('rev_id', 'rev_page', 'rev_text_id', 'rev_user', 'rev_comment', 'rev_user_text',
 476                                 'rev_timestamp', 'rev_minor_edit', 'rev_deleted'),
 477                         array_merge(array("rev_page=$page_id"), $offsets),
 478                         $fname,
 479                         array('ORDER BY' => "rev_timestamp $dirs",
 480                                 'USE INDEX' => 'page_timestamp', 'LIMIT' => $limit)
 481                         );
 482
 483                 $result = array();
 484                 while (($obj = $dbr->fetchObject($res)) != NULL)
 485                         $result[] = $obj;
 486
 487                 return $result;
 488         }
 489
 490         /** @todo document */
 491         function getNotificationTimestamp() {
 492                 global $wgUser, $wgShowUpdatedMarker;
 493                 $fname = 'PageHistory::getNotficationTimestamp';
 494
 495                 if ($this->mNotificationTimestamp !== NULL)
 496                         return $this->mNotificationTimestamp;
 497
 498                 if ($wgUser->isAnon() || !$wgShowUpdatedMarker)
 499                         return $this->mNotificationTimestamp = false;
 500
 501                 $dbr =& wfGetDB(DB_SLAVE);
 502
 503                 $this->mNotificationTimestamp = $dbr->selectField(
 504                         'watchlist',
 505                         'wl_notificationtimestamp',
 506                         array(  'wl_namespace' => $this->mTitle->getNamespace(),
 507                                 'wl_title' => $this->mTitle->getDBkey(),
 508                                 'wl_user' => $wgUser->getID()
 509                         ),
 510                         $fname);
 511
 512                 // Don't use the special value reserved for telling whether the field is filled
 513                 if ( is_null( $this->mNotificationTimestamp ) ) {
 514                         $this->mNotificationTimestamp = false;
 515                 }
 516
 517                 return $this->mNotificationTimestamp;
 518         }
 519
 520         /** @todo document */
 521         function makeNavbar($revisions, $offset, $limit, $direction) {
 522                 global $wgLang;
 523
 524                 $revisions = array_slice($revisions, 0, $limit);
 525
 526                 $latestTimestamp = wfTimestamp(TS_MW, $this->getLatestOffset());
 527                 $earliestTimestamp = wfTimestamp(TS_MW, $this->getEarliestOffset());
 528
 529                 /*
 530                  * When we're displaying previous revisions, we need to reverse
 531                  * the array, because it's queried in reverse order.
 532                  */
 533                 if ($direction == PageHistory::DIR_PREV)
 534                         $revisions = array_reverse($revisions);
 535
 536                 /*
 537                  * lowts is the timestamp of the first revision on this page.
 538                  * hights is the timestamp of the last revision.
 539                  */
 540
 541                 $lowts = $hights = 0;
 542
 543                 if( count( $revisions ) ) {
 544                         $latestShown = wfTimestamp(TS_MW, $revisions[0]->rev_timestamp);
 545                         $earliestShown = wfTimestamp(TS_MW, $revisions[count($revisions) - 1]->rev_timestamp);
 546                 } else {
 547                         $latestShown = null;
 548                         $earliestShown = null;
 549                 }
 550
 551                 /* Don't announce the limit everywhere if it's the default */
 552                 $usefulLimit = $limit == $this->defaultLimit ? '' : $limit;
 553
 554                 $urls = array();
 555                 foreach (array(20, 50, 100, 250, 500) as $num) {
 556                         $urls[] = $this->MakeLink( $wgLang->formatNum($num),
 557                                 array('offset' => $offset == 0 ? '' : wfTimestamp(TS_MW, $offset), 'limit' => $num, ) );
 558                 }
 559
 560                 $bits = implode($urls, ' | ');
 561
 562                 wfDebug("latestShown=$latestShown latestTimestamp=$latestTimestamp\n");
 563                 if( $latestShown < $latestTimestamp ) {
 564                         $prevtext = $this->MakeLink( wfMsgHtml("prevn", $limit),
 565                                 array( 'dir' => 'prev', 'offset' => $latestShown, 'limit' => $usefulLimit ) );
 566                         $lasttext = $this->MakeLink( wfMsgHtml('histlast'),
 567                                 array( 'limit' => $usefulLimit ) );
 568                 } else {
 569                         $prevtext = wfMsgHtml("prevn", $limit);
 570                         $lasttext = wfMsgHtml('histlast');
 571                 }
 572
 573                 wfDebug("earliestShown=$earliestShown earliestTimestamp=$earliestTimestamp\n");
 574                 if( $earliestShown > $earliestTimestamp ) {
 575                         $nexttext = $this->MakeLink( wfMsgHtml("nextn", $limit),
 576                                 array( 'offset' => $earliestShown, 'limit' => $usefulLimit ) );
 577                         $firsttext = $this->MakeLink( wfMsgHtml('histfirst'),
 578                                 array( 'go' => 'first', 'limit' => $usefulLimit ) );
 579                 } else {
 580                         $nexttext = wfMsgHtml("nextn", $limit);
 581                         $firsttext = wfMsgHtml('histfirst');
 582                 }
 583
 584                 $firstlast = "($lasttext | $firsttext)";
 585
 586                 return "$firstlast " . wfMsgHtml("viewprevnext", $prevtext, $nexttext, $bits);
 587         }
 588
 589         function MakeLink($text, $query = NULL) {
 590                 if ( $query === null ) return $text;
 591                 return $this->mSkin->makeKnownLinkObj(
 592                                 $this->mTitle, $text,
 593                                 wfArrayToCGI( $query, array( 'action' => 'history' )));
 594         }
 595
 596
 597         /**
 598          * Output a subscription feed listing recent edits to this page.
 599          * @param string $type
 600          */
 601         function feed( $type ) {
 602                 require_once 'SpecialRecentchanges.php';
 603
 604                 global $wgFeedClasses;
 605                 if( !isset( $wgFeedClasses[$type] ) ) {
 606                         global $wgOut;
 607                         $wgOut->addWikiText( wfMsg( 'feed-invalid' ) );
 608                         return;
 609                 }
 610
 611                 $feed = new $wgFeedClasses[$type](
 612                         $this->mTitle->getPrefixedText() . ' - ' .
 613                                 wfMsgForContent( 'history-feed-title' ),
 614                         wfMsgForContent( 'history-feed-description' ),
 615                         $this->mTitle->getFullUrl( 'action=history' ) );
 616
 617                 $items = $this->fetchRevisions(10, 0, PageHistory::DIR_NEXT);
 618                 $feed->outHeader();
 619                 if( $items ) {
 620                         foreach( $items as $row ) {
 621                                 $feed->outItem( $this->feedItem( $row ) );
 622                         }
 623                 } else {
 624                         $feed->outItem( $this->feedEmpty() );
 625                 }
 626                 $feed->outFooter();
 627         }
 628
 629         function feedEmpty() {
 630                 global $wgOut;
 631                 return new FeedItem(
 632                         wfMsgForContent( 'nohistory' ),
 633                         $wgOut->parse( wfMsgForContent( 'history-feed-empty' ) ),
 634                         $this->mTitle->getFullUrl(),
 635                         wfTimestamp( TS_MW ),
 636                         '',
 637                         $this->mTitle->getTalkPage()->getFullUrl() );
 638         }
 639
 640         /**
 641          * Generate a FeedItem object from a given revision table row
 642          * Borrows Recent Changes' feed generation functions for formatting;
 643          * includes a diff to the previous revision (if any).
 644          *
 645          * @param $row
 646          * @return FeedItem
 647          */
 648         function feedItem( $row ) {
 649                 $rev = new Revision( $row );
 650                 $rev->setTitle( $this->mTitle );
 651                 $text = rcFormatDiffRow( $this->mTitle,
 652                         $this->mTitle->getPreviousRevisionID( $rev->getId() ),
 653                         $rev->getId(),
 654                         $rev->getTimestamp(),
 655                         $rev->getComment() );
 656
 657                 if( $rev->getComment() == '' ) {
 658                         global $wgContLang;
 659                         $title = wfMsgForContent( 'history-feed-item-nocomment',
 660                                 $rev->getUserText(),
 661                                 $wgContLang->timeanddate( $rev->getTimestamp() ) );
 662                 } else {
 663                         $title = $rev->getUserText() . ": " . $this->stripComment( $rev->getComment() );
 664                 }
 665
 666                 return new FeedItem(
 667                         $title,
 668                         $text,
 669                         $this->mTitle->getFullUrl( 'diff=' . $rev->getId() . '&oldid=prev' ),
 670                         $rev->getTimestamp(),
 671                         $rev->getUserText(),
 672                         $this->mTitle->getTalkPage()->getFullUrl() );
 673         }
 674
 675         /**
 676          * Quickie hack... strip out wikilinks to more legible form from the comment.
 677          */
 678         function stripComment( $text ) {
 679                 return preg_replace( '/\[\[([^]]*\|)?([^]]+)\]\]/', '\2', $text );
 680         }
 681
 682
 683 }
 684
 685 ?>