includes/PageHistory.php

   1 <?php
   2 /**
   3  * Page history
   4  *
   5  * Split off from Article.php and Skin.php, 2003-12-22
   6  * @file
   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  */
  18 class PageHistory {
  19         const DIR_PREV = 0;
  20         const DIR_NEXT = 1;
  21
  22         var $mArticle, $mTitle, $mSkin;
  23         var $lastdate;
  24         var $linesonpage;
  25         var $mNotificationTimestamp;
  26         var $mLatestId = null;
  27
  28         /**
  29          * Construct a new PageHistory.
  30          *
  31          * @param Article $article
  32          * @returns nothing
  33          */
  34         function __construct($article) {
  35                 global $wgUser;
  36
  37                 $this->mArticle =& $article;
  38                 $this->mTitle =& $article->mTitle;
  39                 $this->mNotificationTimestamp = NULL;
  40                 $this->mSkin = $wgUser->getSkin();
  41                 $this->preCacheMessages();
  42         }
  43
  44         function getArticle() {
  45                 return $this->mArticle;
  46         }
  47
  48         function getTitle() {
  49                 return $this->mTitle;
  50         }
  51
  52         /**
  53          * As we use the same small set of messages in various methods and that
  54          * they are called often, we call them once and save them in $this->message
  55          */
  56         function preCacheMessages() {
  57                 // Precache various messages
  58                 if( !isset( $this->message ) ) {
  59                         foreach( explode(' ', 'cur last rev-delundel' ) as $msg ) {
  60                                 $this->message[$msg] = wfMsgExt( $msg, array( 'escape') );
  61                         }
  62                 }
  63         }
  64
  65         /**
  66          * Print the history page for an article.
  67          *
  68          * @returns nothing
  69          */
  70         function history() {
  71                 global $wgOut, $wgRequest, $wgTitle, $wgScript;
  72
  73                 /*
  74                  * Allow client caching.
  75                  */
  76                 if( $wgOut->checkLastModified( $this->mArticle->getTouched() ) )
  77                 /* Client cache fresh and headers sent, nothing more to do. */
  78                 return;
  79
  80                 wfProfileIn( __METHOD__ );
  81
  82                 /*
  83                  * Setup page variables.
  84                  */
  85                 $wgOut->setPageTitle( wfMsg( 'history-title', $this->mTitle->getPrefixedText() ) );
  86                 $wgOut->setPageTitleActionText( wfMsg( 'history_short' ) );
  87                 $wgOut->setArticleFlag( false );
  88                 $wgOut->setArticleRelated( true );
  89                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
  90                 $wgOut->setSyndicated( true );
  91                 $wgOut->setFeedAppendQuery( 'action=history' );
  92                 $wgOut->addScriptFile( 'history.js' );
  93
  94                 $logPage = SpecialPage::getTitleFor( 'Log' );
  95                 $logLink = $this->mSkin->makeKnownLinkObj( $logPage, wfMsgHtml( 'viewpagelogs' ), 'page=' . $this->mTitle->getPrefixedUrl() );
  96                 $wgOut->setSubtitle( $logLink );
  97
  98                 $feedType = $wgRequest->getVal( 'feed' );
  99                 if( $feedType ) {
 100                         wfProfileOut( __METHOD__ );
 101                         return $this->feed( $feedType );
 102                 }
 103
 104                 /*
 105                  * Fail if article doesn't exist.
 106                  */
 107                 if( !$this->mTitle->exists() ) {
 108                         $wgOut->addWikiMsg( 'nohistory' );
 109                         wfProfileOut( __METHOD__ );
 110                         return;
 111                 }
 112
 113                 /*
 114                  * "go=first" means to jump to the last (earliest) history page.
 115                  * This is deprecated, it no longer appears in the user interface
 116                  */
 117                 if ( $wgRequest->getText("go") == 'first' ) {
 118                         $limit = $wgRequest->getInt( 'limit', 50 );
 119                         global $wgFeedLimit;
 120                         if( $limit > $wgFeedLimit ) {
 121                                 $limit = $wgFeedLimit;
 122                         }
 123                         $wgOut->redirect( $wgTitle->getLocalURL( "action=history&limit={$limit}&dir=prev" ) );
 124                         return;
 125                 }
 126
 127                 /**
 128                  * Add date selector to quickly get to a certain time
 129                  */
 130                 $year = $wgRequest->getInt( 'year' );
 131                 $month = $wgRequest->getInt( 'month' );
 132
 133                 $action = htmlspecialchars( $wgScript );
 134                 $wgOut->addHTML(
 135                 Xml::fieldset( wfMsg( 'history-search' ), false, array( 'id' => 'mw-history-search' ) ) .
 136                         "<form action=\"$action\" method=\"get\">" .
 137                 Xml::hidden( 'title', $this->mTitle->getPrefixedDBKey() ) . "\n" .
 138                 Xml::hidden( 'action', 'history' ) . "\n" .
 139                 $this->getDateMenu( $year, $month ) . '&nbsp;' .
 140                 Xml::submitButton( wfMsg( 'allpagessubmit' ) ) . "\n" .
 141                         '</form></fieldset>'
 142                         );
 143
 144                         wfRunHooks( 'PageHistoryBeforeList', array( &$this->mArticle ) );
 145
 146                         /**
 147                          * Do the list
 148                          */
 149                         $pager = new PageHistoryPager( $this, $year, $month );
 150                         $this->linesonpage = $pager->getNumRows();
 151                         $wgOut->addHTML(
 152                         $pager->getNavigationBar() .
 153                         $this->beginHistoryList() .
 154                         $pager->getBody() .
 155                         $this->endHistoryList() .
 156                         $pager->getNavigationBar()
 157                         );
 158                         wfProfileOut( __METHOD__ );
 159         }
 160
 161         /**
 162          * @return string Formatted HTML
 163          * @param int $year
 164          * @param int $month
 165          */
 166         private function getDateMenu( $year, $month ) {
 167                 # Offset overrides year/month selection
 168                 if( $month && $month !== -1 ) {
 169                         $encMonth = intval( $month );
 170                 } else {
 171                         $encMonth = '';
 172                 }
 173                 if ( $year ) {
 174                         $encYear = intval( $year );
 175                 } else if( $encMonth ) {
 176                         $thisMonth = intval( gmdate( 'n' ) );
 177                         $thisYear = intval( gmdate( 'Y' ) );
 178                         if( intval($encMonth) > $thisMonth ) {
 179                                 $thisYear--;
 180                         }
 181                         $encYear = $thisYear;
 182                 } else {
 183                         $encYear = '';
 184                 }
 185                 return Xml::label( wfMsg( 'year' ), 'year' ) . ' '.
 186                 Xml::input( 'year', 4, $encYear, array('id' => 'year', 'maxlength' => 4) ) .
 187                         ' '.
 188                 Xml::label( wfMsg( 'month' ), 'month' ) . ' '.
 189                 Xml::monthSelector( $encMonth, -1 );
 190         }
 191
 192         /**
 193          * Creates begin of history list with a submit button
 194          *
 195          * @return string HTML output
 196          */
 197         function beginHistoryList() {
 198                 global $wgTitle, $wgScript, $wgEnableHtmlDiff;
 199                 $this->lastdate = '';
 200                 $s = wfMsgExt( 'histlegend', array( 'parse') );
 201                 $s .= Xml::openElement( 'form', array( 'action' => $wgScript ) );
 202                 $s .= Xml::hidden( 'title', $wgTitle->getPrefixedDbKey() );
 203                 if($wgEnableHtmlDiff){
 204                         $s .= $this->submitButton( wfMsg( 'visualcomparison'),
 205                         array(
 206                                         'name' => 'htmldiff',
 207                                         'class'     => 'historysubmit',
 208                                         'accesskey' => wfMsg( 'accesskey-visualcomparison' ),
 209                                         'title'     => wfMsg( 'tooltip-compareselectedversions' ),
 210                         )
 211                         );
 212                         $s .= $this->submitButton( wfMsg( 'wikicodecomparison'),
 213                         array(
 214                                         'class'     => 'historysubmit',
 215                                         'accesskey' => wfMsg( 'accesskey-compareselectedversions' ),
 216                                         'title'     => wfMsg( 'tooltip-compareselectedversions' ),
 217                         )
 218                         );
 219                 }else{
 220                         $s .= $this->submitButton( wfMsg( 'compareselectedversions'),
 221                         array(
 222                                         'class'     => 'historysubmit',
 223                                         'accesskey' => wfMsg( 'accesskey-compareselectedversions' ),
 224                                         'title'     => wfMsg( 'tooltip-compareselectedversions' ),
 225                         )
 226                         );
 227                 }
 228                 $s .= '<ul id="pagehistory">' . "\n";
 229                 return $s;
 230         }
 231
 232         /**
 233          * Creates end of history list with a submit button
 234          *
 235          * @return string HTML output
 236          */
 237         function endHistoryList() {
 238                 global $wgEnableHtmlDiff;
 239                 $s = '</ul>';
 240                 if($wgEnableHtmlDiff){
 241                         $s .= $this->submitButton( wfMsg( 'visualcomparison'),
 242                         array(
 243                                         'name' => 'htmldiff',
 244                                         'class'     => 'historysubmit',
 245                                         'accesskey' => wfMsg( 'accesskey-visualcomparison' ),
 246                                         'title'     => wfMsg( 'tooltip-compareselectedversions' ),
 247                         )
 248                         );
 249                         $s .= $this->submitButton( wfMsg( 'wikicodecomparison'),
 250                         array(
 251                                         'class'     => 'historysubmit',
 252                                         'accesskey' => wfMsg( 'accesskey-compareselectedversions' ),
 253                                         'title'     => wfMsg( 'tooltip-compareselectedversions' ),
 254                         )
 255                         );
 256                 }else{
 257                         $s .= $this->submitButton( wfMsg( 'compareselectedversions'),
 258                         array(
 259                                         'class'     => 'historysubmit',
 260                                         'accesskey' => wfMsg( 'accesskey-compareselectedversions' ),
 261                                         'title'     => wfMsg( 'tooltip-compareselectedversions' ),
 262                         )
 263                         );
 264                 }
 265                 $s .= '</form>';
 266                 return $s;
 267         }
 268
 269         /**
 270          * Creates a submit button
 271          *
 272          * @param array $attributes attributes
 273          * @return string HTML output for the submit button
 274          */
 275         function submitButton($message, $attributes = array() ) {
 276                 # Disable submit button if history has 1 revision only
 277                 if ( $this->linesonpage > 1 ) {
 278                         return Xml::submitButton( $message , $attributes );
 279                 } else {
 280                         return '';
 281                 }
 282         }
 283
 284         /**
 285          * Returns a row from the history printout.
 286          *
 287          * @todo document some more, and maybe clean up the code (some params redundant?)
 288          *
 289          * @param Row $row The database row corresponding to the previous line.
 290          * @param mixed $next The database row corresponding to the next line.
 291          * @param int $counter Apparently a counter of what row number we're at, counted from the top row = 1.
 292          * @param $notificationtimestamp
 293          * @param bool $latest Whether this row corresponds to the page's latest revision.
 294          * @param bool $firstInList Whether this row corresponds to the first displayed on this history page.
 295          * @return string HTML output for the row
 296          */
 297         function historyLine( $row, $next, $counter = '', $notificationtimestamp = false, $latest = false, $firstInList = false ) {
 298                 global $wgUser, $wgLang;
 299                 $rev = new Revision( $row );
 300                 $rev->setTitle( $this->mTitle );
 301
 302                 $s = '';
 303                 $curlink = $this->curLink( $rev, $latest );
 304                 $lastlink = $this->lastLink( $rev, $next, $counter );
 305                 $arbitrary = $this->diffButtons( $rev, $firstInList, $counter );
 306                 $link = $this->revLink( $rev );
 307
 308                 $s .= "($curlink) ($lastlink) $arbitrary";
 309
 310                 if( $wgUser->isAllowed( 'deleterevision' ) ) {
 311                         $revdel = SpecialPage::getTitleFor( 'Revisiondelete' );
 312                         if( $firstInList ) {
 313                                 // We don't currently handle well changing the top revision's settings
 314                                 $del = $this->message['rev-delundel'];
 315                         } else if( !$rev->userCan( Revision::DELETED_RESTRICTED ) ) {
 316                                 // If revision was hidden from sysops
 317                                 $del = $this->message['rev-delundel'];
 318                         } else {
 319                                 $del = $this->mSkin->makeKnownLinkObj( $revdel,
 320                                 $this->message['rev-delundel'],
 321                                         'target=' . urlencode( $this->mTitle->getPrefixedDbkey() ) .
 322                                         '&oldid=' . urlencode( $rev->getId() ) );
 323                                 // Bolden oversighted content
 324                                 if( $rev->isDeleted( Revision::DELETED_RESTRICTED ) )
 325                                 $del = "<strong>$del</strong>";
 326                         }
 327                         $s .= " <tt>(<small>$del</small>)</tt> ";
 328                 }
 329
 330                 $s .= " $link";
 331                 $s .= " <span class='history-user'>" . $this->mSkin->revUserTools( $rev, true ) . "</span>";
 332
 333                 if( $row->rev_minor_edit ) {
 334                         $s .= ' ' . Xml::element( 'span', array( 'class' => 'minor' ), wfMsg( 'minoreditletter') );
 335                 }
 336
 337                 if ( !is_null( $size = $rev->getSize() ) && $rev->userCan( Revision::DELETED_TEXT ) ) {
 338                         $s .= ' ' . $this->mSkin->formatRevisionSize( $size );
 339                 }
 340
 341                 $s .= $this->mSkin->revComment( $rev, false, true );
 342
 343                 if ($notificationtimestamp && ($row->rev_timestamp >= $notificationtimestamp)) {
 344                         $s .= ' <span class="updatedmarker">' .  wfMsgHtml( 'updatedmarker' ) . '</span>';
 345                 }
 346                 #add blurb about text having been deleted
 347                 if( $rev->isDeleted( Revision::DELETED_TEXT ) ) {
 348                         $s .= ' <tt>' . wfMsgHtml( 'deletedrev' ) . '</tt>';
 349                 }
 350
 351                 $tools = array();
 352
 353                 if ( !is_null( $next ) && is_object( $next ) ) {
 354                         if( !$this->mTitle->getUserPermissionsErrors( 'rollback', $wgUser )
 355                         && !$this->mTitle->getUserPermissionsErrors( 'edit', $wgUser )
 356                         && $latest ) {
 357                                 $tools[] = '<span class="mw-rollback-link">'
 358                                 . $this->mSkin->buildRollbackLink( $rev )
 359                                 . '</span>';
 360                         }
 361
 362                         if( $this->mTitle->quickUserCan( 'edit' ) &&
 363                         !$rev->isDeleted( Revision::DELETED_TEXT ) &&
 364                         !$next->rev_deleted & Revision::DELETED_TEXT ) {
 365
 366                                 # Create undo tooltip for the first (=latest) line only
 367                                 $undoTooltip = $latest
 368                                         ? array( 'title' => wfMsg( 'tooltip-undo' ) )
 369                                         : array();
 370                                 $undolink = $this->mSkin->link(
 371                                         $this->mTitle,
 372                                         wfMsgHtml( 'editundo' ),
 373                                         $undoTooltip,
 374                                         array( 'action' => 'edit', 'undoafter' => $next->rev_id, 'undo' => $rev->getId() ),
 375                                         array( 'known', 'noclasses' )
 376                                 );
 377                                 $tools[] = "<span class=\"mw-history-undo\">{$undolink}</span>";
 378                         }
 379                 }
 380
 381                 if( $tools ) {
 382                         $s .= ' (' . implode( ' | ', $tools ) . ')';
 383                 }
 384
 385                 wfRunHooks( 'PageHistoryLineEnding', array( $this, &$row , &$s ) );
 386
 387                 return "<li>$s</li>\n";
 388         }
 389
 390         /**
 391          * Create a link to view this revision of the page
 392          * @param Revision $rev
 393          * @returns string
 394          */
 395         function revLink( $rev ) {
 396                 global $wgLang;
 397                 $date = $wgLang->timeanddate( wfTimestamp(TS_MW, $rev->getTimestamp()), true );
 398                 if( $rev->userCan( Revision::DELETED_TEXT ) ) {
 399                         $link = $this->mSkin->makeKnownLinkObj(
 400                         $this->mTitle, $date, "oldid=" . $rev->getId() );
 401                 } else {
 402                         $link = $date;
 403                 }
 404                 if( $rev->isDeleted( Revision::DELETED_TEXT ) ) {
 405                         return '<span class="history-deleted">' . $link . '</span>';
 406                 }
 407                 return $link;
 408         }
 409
 410         /**
 411          * Create a diff-to-current link for this revision for this page
 412          * @param Revision $rev
 413          * @param Bool $latest, this is the latest revision of the page?
 414          * @returns string
 415          */
 416         function curLink( $rev, $latest ) {
 417                 $cur = $this->message['cur'];
 418                 if( $latest || !$rev->userCan( Revision::DELETED_TEXT ) ) {
 419                         return $cur;
 420                 } else {
 421                         return $this->mSkin->makeKnownLinkObj(
 422                         $this->mTitle, $cur,
 423                                 'diff=' . $this->getLatestID() .
 424                                 "&oldid=" . $rev->getId() );
 425                 }
 426         }
 427
 428         /**
 429          * Create a diff-to-previous link for this revision for this page.
 430          * @param Revision $prevRev, the previous revision
 431          * @param mixed $next, the newer revision
 432          * @param int $counter, what row on the history list this is
 433          * @returns string
 434          */
 435         function lastLink( $prevRev, $next, $counter ) {
 436                 $last = $this->message['last'];
 437                 # $next may either be a Row, null, or "unkown"
 438                 $nextRev = is_object($next) ? new Revision( $next ) : $next;
 439                 if( is_null($next) ) {
 440                         # Probably no next row
 441                         return $last;
 442                 } elseif( $next === 'unknown' ) {
 443                         # Next row probably exists but is unknown, use an oldid=prev link
 444                         return $this->mSkin->makeKnownLinkObj(
 445                         $this->mTitle,
 446                         $last,
 447                                 "diff=" . $prevRev->getId() . "&oldid=prev" );
 448                 } elseif( !$prevRev->userCan(Revision::DELETED_TEXT) || !$nextRev->userCan(Revision::DELETED_TEXT) ) {
 449                         return $last;
 450                 } else {
 451                         return $this->mSkin->makeKnownLinkObj(
 452                         $this->mTitle,
 453                         $last,
 454                                 "diff=" . $prevRev->getId() . "&oldid={$next->rev_id}"
 455                         /*,
 456                                 '',
 457                                 '',
 458                                 "tabindex={$counter}"*/ );
 459                 }
 460         }
 461
 462         /**
 463          * Create radio buttons for page history
 464          *
 465          * @param object $rev Revision
 466          * @param bool $firstInList Is this version the first one?
 467          * @param int $counter A counter of what row number we're at, counted from the top row = 1.
 468          * @return string HTML output for the radio buttons
 469          */
 470         function diffButtons( $rev, $firstInList, $counter ) {
 471                 if( $this->linesonpage > 1) {
 472                         $radio = array(
 473                                 'type'  => 'radio',
 474                                 'value' => $rev->getId(),
 475                         );
 476
 477                         if( !$rev->userCan( Revision::DELETED_TEXT ) ) {
 478                                 $radio['disabled'] = 'disabled';
 479                         }
 480
 481                         /** @todo: move title texts to javascript */
 482                         if ( $firstInList ) {
 483                                 $first = Xml::element( 'input', array_merge(
 484                                 $radio,
 485                                 array(
 486                                                 'style' => 'visibility:hidden',
 487                                                 'name'  => 'oldid' ) ) );
 488                                 $checkmark = array( 'checked' => 'checked' );
 489                         } else {
 490                                 if( $counter == 2 ) {
 491                                         $checkmark = array( 'checked' => 'checked' );
 492                                 } else {
 493                                         $checkmark = array();
 494                                 }
 495                                 $first = Xml::element( 'input', array_merge(
 496                                 $radio,
 497                                 $checkmark,
 498                                 array( 'name'  => 'oldid' ) ) );
 499                                 $checkmark = array();
 500                         }
 501                         $second = Xml::element( 'input', array_merge(
 502                         $radio,
 503                         $checkmark,
 504                         array( 'name'  => 'diff' ) ) );
 505                         return $first . $second;
 506                 } else {
 507                         return '';
 508                 }
 509         }
 510
 511         /** @todo document */
 512         function getLatestId() {
 513                 if( is_null( $this->mLatestId ) ) {
 514                         $id = $this->mTitle->getArticleID();
 515                         $db = wfGetDB( DB_SLAVE );
 516                         $this->mLatestId = $db->selectField( 'page',
 517                                 "page_latest",
 518                         array( 'page_id' => $id ),
 519                         __METHOD__ );
 520                 }
 521                 return $this->mLatestId;
 522         }
 523
 524         /**
 525          * Fetch an array of revisions, specified by a given limit, offset and
 526          * direction. This is now only used by the feeds. It was previously
 527          * used by the main UI but that's now handled by the pager.
 528          */
 529         function fetchRevisions($limit, $offset, $direction) {
 530                 $dbr = wfGetDB( DB_SLAVE );
 531
 532                 if ($direction == PageHistory::DIR_PREV)
 533                 list($dirs, $oper) = array("ASC", ">=");
 534                 else /* $direction == PageHistory::DIR_NEXT */
 535                 list($dirs, $oper) = array("DESC", "<=");
 536
 537                 if ($offset)
 538                 $offsets = array("rev_timestamp $oper '$offset'");
 539                 else
 540                 $offsets = array();
 541
 542                 $page_id = $this->mTitle->getArticleID();
 543
 544                 return $dbr->select(
 545                         'revision',
 546                 Revision::selectFields(),
 547                 array_merge(array("rev_page=$page_id"), $offsets),
 548                 __METHOD__,
 549                 array('ORDER BY' => "rev_timestamp $dirs",
 550                                 'USE INDEX' => 'page_timestamp', 'LIMIT' => $limit)
 551                 );
 552         }
 553
 554         /** @todo document */
 555         function getNotificationTimestamp() {
 556                 global $wgUser, $wgShowUpdatedMarker;
 557
 558                 if ($this->mNotificationTimestamp !== NULL)
 559                 return $this->mNotificationTimestamp;
 560
 561                 if ($wgUser->isAnon() || !$wgShowUpdatedMarker)
 562                 return $this->mNotificationTimestamp = false;
 563
 564                 $dbr = wfGetDB(DB_SLAVE);
 565
 566                 $this->mNotificationTimestamp = $dbr->selectField(
 567                         'watchlist',
 568                         'wl_notificationtimestamp',
 569                 array(  'wl_namespace' => $this->mTitle->getNamespace(),
 570                                 'wl_title' => $this->mTitle->getDBkey(),
 571                                 'wl_user' => $wgUser->getId()
 572                 ),
 573                 __METHOD__ );
 574
 575                 // Don't use the special value reserved for telling whether the field is filled
 576                 if ( is_null( $this->mNotificationTimestamp ) ) {
 577                         $this->mNotificationTimestamp = false;
 578                 }
 579
 580                 return $this->mNotificationTimestamp;
 581         }
 582
 583         /**
 584          * Output a subscription feed listing recent edits to this page.
 585          * @param string $type
 586          */
 587         function feed( $type ) {
 588                 global $wgFeedClasses, $wgRequest, $wgFeedLimit;
 589                 if ( !FeedUtils::checkFeedOutput($type) ) {
 590                         return;
 591                 }
 592
 593                 $feed = new $wgFeedClasses[$type](
 594                 $this->mTitle->getPrefixedText() . ' - ' .
 595                 wfMsgForContent( 'history-feed-title' ),
 596                 wfMsgForContent( 'history-feed-description' ),
 597                 $this->mTitle->getFullUrl( 'action=history' ) );
 598
 599                 // Get a limit on number of feed entries. Provide a sane default
 600                 // of 10 if none is defined (but limit to $wgFeedLimit max)
 601                 $limit = $wgRequest->getInt( 'limit', 10 );
 602                 if( $limit > $wgFeedLimit || $limit < 1 ) {
 603                         $limit = 10;
 604                 }
 605                 $items = $this->fetchRevisions($limit, 0, PageHistory::DIR_NEXT);
 606
 607                 $feed->outHeader();
 608                 if( $items ) {
 609                         foreach( $items as $row ) {
 610                                 $feed->outItem( $this->feedItem( $row ) );
 611                         }
 612                 } else {
 613                         $feed->outItem( $this->feedEmpty() );
 614                 }
 615                 $feed->outFooter();
 616         }
 617
 618         function feedEmpty() {
 619                 global $wgOut;
 620                 return new FeedItem(
 621                 wfMsgForContent( 'nohistory' ),
 622                 $wgOut->parse( wfMsgForContent( 'history-feed-empty' ) ),
 623                 $this->mTitle->getFullUrl(),
 624                 wfTimestamp( TS_MW ),
 625                         '',
 626                 $this->mTitle->getTalkPage()->getFullUrl() );
 627         }
 628
 629         /**
 630          * Generate a FeedItem object from a given revision table row
 631          * Borrows Recent Changes' feed generation functions for formatting;
 632          * includes a diff to the previous revision (if any).
 633          *
 634          * @param $row
 635          * @return FeedItem
 636          */
 637         function feedItem( $row ) {
 638                 $rev = new Revision( $row );
 639                 $rev->setTitle( $this->mTitle );
 640                 $text = FeedUtils::formatDiffRow( $this->mTitle,
 641                 $this->mTitle->getPreviousRevisionID( $rev->getId() ),
 642                 $rev->getId(),
 643                 $rev->getTimestamp(),
 644                 $rev->getComment() );
 645
 646                 if( $rev->getComment() == '' ) {
 647                         global $wgContLang;
 648                         $title = wfMsgForContent( 'history-feed-item-nocomment',
 649                         $rev->getUserText(),
 650                         $wgContLang->timeanddate( $rev->getTimestamp() ) );
 651                 } else {
 652                         $title = $rev->getUserText() . ": " . $this->stripComment( $rev->getComment() );
 653                 }
 654
 655                 return new FeedItem(
 656                 $title,
 657                 $text,
 658                 $this->mTitle->getFullUrl( 'diff=' . $rev->getId() . '&oldid=prev' ),
 659                 $rev->getTimestamp(),
 660                 $rev->getUserText(),
 661                 $this->mTitle->getTalkPage()->getFullUrl() );
 662         }
 663
 664         /**
 665          * Quickie hack... strip out wikilinks to more legible form from the comment.
 666          */
 667         function stripComment( $text ) {
 668                 return preg_replace( '/\[\[([^]]*\|)?([^]]+)\]\]/', '\2', $text );
 669         }
 670 }
 671
 672
 673 /**
 674  * @ingroup Pager
 675  */
 676 class PageHistoryPager extends ReverseChronologicalPager {
 677         public $mLastRow = false, $mPageHistory;
 678
 679         function __construct( $pageHistory, $year='', $month='' ) {
 680                 parent::__construct();
 681                 $this->mPageHistory = $pageHistory;
 682                 $this->getDateCond( $year, $month );
 683         }
 684
 685         function getQueryInfo() {
 686                 $queryInfo = array(
 687                         'tables'  => array('revision'),
 688                         'fields'  => Revision::selectFields(),
 689                         'conds'   => array('rev_page' => $this->mPageHistory->mTitle->getArticleID() ),
 690                         'options' => array( 'USE INDEX' => array('revision' => 'page_timestamp') )
 691                 );
 692                 wfRunHooks( 'PageHistoryPager::getQueryInfo', array( &$this, &$queryInfo ) );
 693                 return $queryInfo;
 694         }
 695
 696         function getIndexField() {
 697                 return 'rev_timestamp';
 698         }
 699
 700         function formatRow( $row ) {
 701                 if ( $this->mLastRow ) {
 702                         $latest = $this->mCounter == 1 && $this->mIsFirst;
 703                         $firstInList = $this->mCounter == 1;
 704                         $s = $this->mPageHistory->historyLine( $this->mLastRow, $row, $this->mCounter++,
 705                         $this->mPageHistory->getNotificationTimestamp(), $latest, $firstInList );
 706                 } else {
 707                         $s = '';
 708                 }
 709                 $this->mLastRow = $row;
 710                 return $s;
 711         }
 712
 713         function getStartBody() {
 714                 $this->mLastRow = false;
 715                 $this->mCounter = 1;
 716                 return '';
 717         }
 718
 719         function getEndBody() {
 720                 if ( $this->mLastRow ) {
 721                         $latest = $this->mCounter == 1 && $this->mIsFirst;
 722                         $firstInList = $this->mCounter == 1;
 723                         if ( $this->mIsBackwards ) {
 724                                 # Next row is unknown, but for UI reasons, probably exists if an offset has been specified
 725                                 if ( $this->mOffset == '' ) {
 726                                         $next = null;
 727                                 } else {
 728                                         $next = 'unknown';
 729                                 }
 730                         } else {
 731                                 # The next row is the past-the-end row
 732                                 $next = $this->mPastTheEndRow;
 733                         }
 734                         $s = $this->mPageHistory->historyLine( $this->mLastRow, $next, $this->mCounter++,
 735                         $this->mPageHistory->getNotificationTimestamp(), $latest, $firstInList );
 736                 } else {
 737                         $s = '';
 738                 }
 739                 return $s;
 740         }
 741 }