includes/specials/SpecialWhatlinkshere.php

   1 <?php
   2 /**
   3  * @todo Use some variant of Pager or something; the pagination here is lousy.
   4  *
   5  * @file
   6  * @ingroup SpecialPage
   7  */
   8
   9 /**
  10  * implements Special:Whatlinkshere
  11  * @ingroup SpecialPage
  12  */
  13 class SpecialWhatLinksHere extends SpecialPage {
  14
  15         // Stored objects
  16         protected $opts, $target, $selfTitle;
  17
  18         // Stored globals
  19         protected $skin;
  20
  21         protected $limits = array( 20, 50, 100, 250, 500 );
  22
  23         public function __construct() {
  24                 parent::__construct( 'Whatlinkshere' );
  25                 global $wgUser;
  26                 $this->skin = $wgUser->getSkin();
  27         }
  28
  29         function execute( $par ) {
  30                 global $wgOut, $wgRequest;
  31
  32                 $opts = new FormOptions();
  33
  34                 $opts->add( 'target', '' );
  35                 $opts->add( 'namespace', '', FormOptions::INTNULL );
  36                 $opts->add( 'limit', 50 );
  37                 $opts->add( 'from', 0 );
  38                 $opts->add( 'back', 0 );
  39                 $opts->add( 'hideredirs', false );
  40                 $opts->add( 'hidetrans', false );
  41                 $opts->add( 'hidelinks', false );
  42                 $opts->add( 'hideimages', false );
  43
  44                 $opts->fetchValuesFromRequest( $wgRequest );
  45                 $opts->validateIntBounds( 'limit', 0, 5000 );
  46
  47                 // Give precedence to subpage syntax
  48                 if ( isset($par) ) {
  49                         $opts->setValue( 'target', $par );
  50                 }
  51
  52                 // Bind to member variable
  53                 $this->opts = $opts;
  54
  55                 $this->target = Title::newFromURL( $opts->getValue( 'target' ) );
  56                 if( !$this->target ) {
  57                         $wgOut->addHTML( $this->whatlinkshereForm() );
  58                         return;
  59                 }
  60
  61                 $this->selfTitle = SpecialPage::getTitleFor( 'Whatlinkshere', $this->target->getPrefixedDBkey() );
  62
  63                 $wgOut->setPageTitle( wfMsg( 'whatlinkshere-title', $this->target->getPrefixedText() ) );
  64                 $wgOut->setSubtitle( wfMsg( 'whatlinkshere-backlink', $this->skin->link( $this->target, $this->target->getPrefixedText(), array(), array( 'redirect' => 'no'  ) ) ) );
  65
  66                 $this->showIndirectLinks( 0, $this->target, $opts->getValue( 'limit' ),
  67                         $opts->getValue( 'from' ), $opts->getValue( 'back' ) );
  68         }
  69
  70         /**
  71          * @param $level  int     Recursion level
  72          * @param $target Title   Target title
  73          * @param $limit  int     Number of entries to display
  74          * @param $from   Title   Display from this article ID
  75          * @param $back   Title   Display from this article ID at backwards scrolling
  76          * @private
  77          */
  78         function showIndirectLinks( $level, $target, $limit, $from = 0, $back = 0 ) {
  79                 global $wgOut, $wgMaxRedirectLinksRetrieved;
  80                 $dbr = wfGetDB( DB_SLAVE );
  81                 $options = array();
  82
  83                 $hidelinks = $this->opts->getValue( 'hidelinks' );
  84                 $hideredirs = $this->opts->getValue( 'hideredirs' );
  85                 $hidetrans = $this->opts->getValue( 'hidetrans' );
  86                 $hideimages = $target->getNamespace() != NS_FILE || $this->opts->getValue( 'hideimages' );
  87
  88                 $fetchlinks = (!$hidelinks || !$hideredirs);
  89
  90                 // Make the query
  91                 $plConds = array(
  92                         'page_id=pl_from',
  93                         'pl_namespace' => $target->getNamespace(),
  94                         'pl_title' => $target->getDBkey(),
  95                 );
  96                 if( $hideredirs ) {
  97                         $plConds['page_is_redirect'] = 0;
  98                 } elseif( $hidelinks ) {
  99                         $plConds['page_is_redirect'] = 1;
 100                 }
 101
 102                 $tlConds = array(
 103                         'page_id=tl_from',
 104                         'tl_namespace' => $target->getNamespace(),
 105                         'tl_title' => $target->getDBkey(),
 106                 );
 107
 108                 $ilConds = array(
 109                         'page_id=il_from',
 110                         'il_to' => $target->getDBkey(),
 111                 );
 112
 113                 $namespace = $this->opts->getValue( 'namespace' );
 114                 if ( is_int($namespace) ) {
 115                         $plConds['page_namespace'] = $namespace;
 116                         $tlConds['page_namespace'] = $namespace;
 117                         $ilConds['page_namespace'] = $namespace;
 118                 }
 119
 120                 if ( $from ) {
 121                         $tlConds[] = "tl_from >= $from";
 122                         $plConds[] = "pl_from >= $from";
 123                         $ilConds[] = "il_from >= $from";
 124                 }
 125
 126                 // Read an extra row as an at-end check
 127                 $queryLimit = $limit + 1;
 128
 129                 // Enforce join order, sometimes namespace selector may
 130                 // trigger filesorts which are far less efficient than scanning many entries
 131                 $options[] = 'STRAIGHT_JOIN';
 132
 133                 $options['LIMIT'] = $queryLimit;
 134                 $fields = array( 'page_id', 'page_namespace', 'page_title', 'page_is_redirect' );
 135
 136                 if( $fetchlinks ) {
 137                         $options['ORDER BY'] = 'pl_from';
 138                         $plRes = $dbr->select( array( 'pagelinks', 'page' ), $fields,
 139                                 $plConds, __METHOD__, $options );
 140                 }
 141
 142                 if( !$hidetrans ) {
 143                         $options['ORDER BY'] = 'tl_from';
 144                         $tlRes = $dbr->select( array( 'templatelinks', 'page' ), $fields,
 145                                 $tlConds, __METHOD__, $options );
 146                 }
 147
 148                 if( !$hideimages ) {
 149                         $options['ORDER BY'] = 'il_from';
 150                         $ilRes = $dbr->select( array( 'imagelinks', 'page' ), $fields,
 151                                 $ilConds, __METHOD__, $options );
 152                 }
 153
 154                 if( ( !$fetchlinks || !$dbr->numRows($plRes) ) && ( $hidetrans || !$dbr->numRows($tlRes) ) && ( $hideimages || !$dbr->numRows($ilRes) ) ) {
 155                         if ( 0 == $level ) {
 156                                 $wgOut->addHTML( $this->whatlinkshereForm() );
 157
 158                                 // Show filters only if there are links
 159                                 if( $hidelinks || $hidetrans || $hideredirs || $hideimages )
 160                                         $wgOut->addHTML( $this->getFilterPanel() );
 161
 162                                 $errMsg = is_int($namespace) ? 'nolinkshere-ns' : 'nolinkshere';
 163                                 $wgOut->addWikiMsg( $errMsg, $this->target->getPrefixedText() );
 164                         }
 165                         return;
 166                 }
 167
 168                 // Read the rows into an array and remove duplicates
 169                 // templatelinks comes second so that the templatelinks row overwrites the
 170                 // pagelinks row, so we get (inclusion) rather than nothing
 171                 if( $fetchlinks ) {
 172                         while ( $row = $dbr->fetchObject( $plRes ) ) {
 173                                 $row->is_template = 0;
 174                                 $row->is_image = 0;
 175                                 $rows[$row->page_id] = $row;
 176                         }
 177                         $dbr->freeResult( $plRes );
 178
 179                 }
 180                 if( !$hidetrans ) {
 181                         while ( $row = $dbr->fetchObject( $tlRes ) ) {
 182                                 $row->is_template = 1;
 183                                 $row->is_image = 0;
 184                                 $rows[$row->page_id] = $row;
 185                         }
 186                         $dbr->freeResult( $tlRes );
 187                 }
 188                 if( !$hideimages ) {
 189                         while ( $row = $dbr->fetchObject( $ilRes ) ) {
 190                                 $row->is_template = 0;
 191                                 $row->is_image = 1;
 192                                 $rows[$row->page_id] = $row;
 193                         }
 194                         $dbr->freeResult( $ilRes );
 195                 }
 196
 197                 // Sort by key and then change the keys to 0-based indices
 198                 ksort( $rows );
 199                 $rows = array_values( $rows );
 200
 201                 $numRows = count( $rows );
 202
 203                 // Work out the start and end IDs, for prev/next links
 204                 if ( $numRows > $limit ) {
 205                         // More rows available after these ones
 206                         // Get the ID from the last row in the result set
 207                         $nextId = $rows[$limit]->page_id;
 208                         // Remove undisplayed rows
 209                         $rows = array_slice( $rows, 0, $limit );
 210                 } else {
 211                         // No more rows after
 212                         $nextId = false;
 213                 }
 214                 $prevId = $from;
 215
 216                 if ( $level == 0 ) {
 217                         $wgOut->addHTML( $this->whatlinkshereForm() );
 218                         $wgOut->addHTML( $this->getFilterPanel() );
 219                         $wgOut->addWikiMsg( 'linkshere', $this->target->getPrefixedText() );
 220
 221                         $prevnext = $this->getPrevNext( $prevId, $nextId );
 222                         $wgOut->addHTML( $prevnext );
 223                 }
 224
 225                 $wgOut->addHTML( $this->listStart() );
 226                 foreach ( $rows as $row ) {
 227                         $nt = Title::makeTitle( $row->page_namespace, $row->page_title );
 228
 229                         if ( $row->page_is_redirect && $level < 2 ) {
 230                                 $wgOut->addHTML( $this->listItem( $row, $nt, true ) );
 231                                 $this->showIndirectLinks( $level + 1, $nt, $wgMaxRedirectLinksRetrieved );
 232                                 $wgOut->addHTML( Xml::closeElement( 'li' ) );
 233                         } else {
 234                                 $wgOut->addHTML( $this->listItem( $row, $nt ) );
 235                         }
 236                 }
 237
 238                 $wgOut->addHTML( $this->listEnd() );
 239
 240                 if( $level == 0 ) {
 241                         $wgOut->addHTML( $prevnext );
 242                 }
 243         }
 244
 245         protected function listStart() {
 246                 return Xml::openElement( 'ul', array ( 'id' => 'mw-whatlinkshere-list' ) );
 247         }
 248
 249         protected function listItem( $row, $nt, $notClose = false ) {
 250                 # local message cache
 251                 static $msgcache = null;
 252                 if ( $msgcache === null ) {
 253                         static $msgs = array( 'isredirect', 'istemplate', 'semicolon-separator',
 254                                 'whatlinkshere-links', 'isimage' );
 255                         $msgcache = array();
 256                         foreach ( $msgs as $msg ) {
 257                                 $msgcache[$msg] = wfMsgExt( $msg, array( 'escapenoentities' ) );
 258                         }
 259                 }
 260
 261                 if( $row->page_is_redirect ) {
 262                         $query = array( 'redirect' => 'no' );
 263                 } else {
 264                         $query = array();
 265                 }
 266
 267                 $link = $this->skin->linkKnown(
 268                         $nt,
 269                         null,
 270                         array(),
 271                         $query
 272                 );
 273
 274                 // Display properties (redirect or template)
 275                 $propsText = '';
 276                 $props = array();
 277                 if ( $row->page_is_redirect )
 278                         $props[] = $msgcache['isredirect'];
 279                 if ( $row->is_template )
 280                         $props[] = $msgcache['istemplate'];
 281                 if( $row->is_image )
 282                         $props[] = $msgcache['isimage'];
 283
 284                 if ( count( $props ) ) {
 285                         $propsText = '(' . implode( $msgcache['semicolon-separator'], $props ) . ')';
 286                 }
 287
 288                 # Space for utilities links, with a what-links-here link provided
 289                 $wlhLink = $this->wlhLink( $nt, $msgcache['whatlinkshere-links'] );
 290                 $wlh = Xml::wrapClass( "($wlhLink)", 'mw-whatlinkshere-tools' );
 291
 292                 return $notClose ?
 293                         Xml::openElement( 'li' ) . "$link $propsText $wlh\n" :
 294                         Xml::tags( 'li', null, "$link $propsText $wlh" ) . "\n";
 295         }
 296
 297         protected function listEnd() {
 298                 return Xml::closeElement( 'ul' );
 299         }
 300
 301         protected function wlhLink( Title $target, $text ) {
 302                 static $title = null;
 303                 if ( $title === null )
 304                         $title = SpecialPage::getTitleFor( 'Whatlinkshere' );
 305
 306                 $targetText = $target->getPrefixedUrl();
 307                 return $this->skin->linkKnown(
 308                         $title,
 309                         $text,
 310                         array(),
 311                         array( 'target' => $targetText )
 312                 );
 313         }
 314
 315         function makeSelfLink( $text, $query ) {
 316                 return $this->skin->linkKnown(
 317                         $this->selfTitle,
 318                         $text,
 319                         array(),
 320                         $query
 321                 );
 322         }
 323
 324         function getPrevNext( $prevId, $nextId ) {
 325                 global $wgLang;
 326                 $currentLimit = $this->opts->getValue( 'limit' );
 327                 $fmtLimit = $wgLang->formatNum( $currentLimit );
 328                 $prev = wfMsgExt( 'whatlinkshere-prev', array( 'parsemag', 'escape' ), $fmtLimit );
 329                 $next = wfMsgExt( 'whatlinkshere-next', array( 'parsemag', 'escape' ), $fmtLimit );
 330
 331                 $changed = $this->opts->getChangedValues();
 332                 unset($changed['target']); // Already in the request title
 333
 334                 if ( 0 != $prevId ) {
 335                         $overrides = array( 'from' => $this->opts->getValue( 'back' ) );
 336                         $prev = $this->makeSelfLink( $prev, array_merge( $overrides, $changed ) );
 337                 }
 338                 if ( 0 != $nextId ) {
 339                         $overrides = array( 'from' => $nextId, 'back' => $prevId );
 340                         $next = $this->makeSelfLink( $next, array_merge( $overrides, $changed ) );
 341                 }
 342
 343                 $limitLinks = array();
 344                 foreach ( $this->limits as $limit ) {
 345                         $prettyLimit = $wgLang->formatNum( $limit );
 346                         $overrides = array( 'limit' => $limit );
 347                         $limitLinks[] = $this->makeSelfLink( $prettyLimit, array_merge( $overrides, $changed ) );
 348                 }
 349
 350                 $nums = $wgLang->pipeList( $limitLinks );
 351
 352                 return wfMsgHtml( 'viewprevnext', $prev, $next, $nums );
 353         }
 354
 355         function whatlinkshereForm() {
 356                 global $wgScript;
 357
 358                 // We get nicer value from the title object
 359                 $this->opts->consumeValue( 'target' );
 360                 // Reset these for new requests
 361                 $this->opts->consumeValues( array( 'back', 'from' ) );
 362
 363                 $target = $this->target ? $this->target->getPrefixedText() : '';
 364                 $namespace = $this->opts->consumeValue( 'namespace' );
 365
 366                 # Build up the form
 367                 $f = Xml::openElement( 'form', array( 'action' => $wgScript ) );
 368
 369                 # Values that should not be forgotten
 370                 $f .= Xml::hidden( 'title', SpecialPage::getTitleFor( 'Whatlinkshere' )->getPrefixedText() );
 371                 foreach ( $this->opts->getUnconsumedValues() as $name => $value ) {
 372                         $f .= Xml::hidden( $name, $value );
 373                 }
 374
 375                 $f .= Xml::fieldset( wfMsg( 'whatlinkshere' ) );
 376
 377                 # Target input
 378                 $f .= Xml::inputLabel( wfMsg( 'whatlinkshere-page' ), 'target',
 379                                 'mw-whatlinkshere-target', 40, $target );
 380
 381                 $f .= ' ';
 382
 383                 # Namespace selector
 384                 $f .= Xml::label( wfMsg( 'namespace' ), 'namespace' ) . '&nbsp;' .
 385                         Xml::namespaceSelector( $namespace, '' );
 386
 387                 $f .= ' ';
 388
 389                 # Submit
 390                 $f .= Xml::submitButton( wfMsg( 'allpagessubmit' ) );
 391
 392                 # Close
 393                 $f .= Xml::closeElement( 'fieldset' ) . Xml::closeElement( 'form' ) . "\n";
 394
 395                 return $f;
 396         }
 397
 398         function getFilterPanel() {
 399                 global $wgLang;
 400                 $show = wfMsgHtml( 'show' );
 401                 $hide = wfMsgHtml( 'hide' );
 402
 403                 $changed = $this->opts->getChangedValues();
 404                 unset($changed['target']); // Already in the request title
 405
 406                 $links = array();
 407                 $types = array( 'hidetrans', 'hidelinks', 'hideredirs' );
 408                 if( $this->target->getNamespace() == NS_FILE )
 409                         $types[] = 'hideimages';
 410                 foreach( $types as $type ) {
 411                         $chosen = $this->opts->getValue( $type );
 412                         $msg = wfMsgHtml( "whatlinkshere-{$type}", $chosen ? $show : $hide );
 413                         $overrides = array( $type => !$chosen );
 414                         $links[] = $this->makeSelfLink( $msg, array_merge( $overrides, $changed ) );
 415                 }
 416                 return Xml::fieldset( wfMsg( 'whatlinkshere-filters' ), $wgLang->pipeList( $links ) );
 417         }
 418 }