includes/specials/SpecialWhatlinkshere.php

   1 <?php
   2 /**
   3  * Implements Special:Whatlinkshere
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18  * http://www.gnu.org/copyleft/gpl.html
  19  *
  20  * @file
  21  * @todo Use some variant of Pager or something; the pagination here is lousy.
  22  */
  23
  24 /**
  25  * Implements Special:Whatlinkshere
  26  *
  27  * @ingroup SpecialPage
  28  */
  29 class SpecialWhatLinksHere extends SpecialPage {
  30
  31         // Stored objects
  32         protected $opts, $target, $selfTitle;
  33
  34         // Stored globals
  35         protected $skin;
  36
  37         protected $limits = array( 20, 50, 100, 250, 500 );
  38
  39         public function __construct() {
  40                 parent::__construct( 'Whatlinkshere' );
  41                 global $wgUser;
  42                 $this->skin = $wgUser->getSkin();
  43         }
  44
  45         function execute( $par ) {
  46                 global $wgOut, $wgRequest;
  47
  48                 $this->setHeaders();
  49
  50                 $opts = new FormOptions();
  51
  52                 $opts->add( 'target', '' );
  53                 $opts->add( 'namespace', '', FormOptions::INTNULL );
  54                 $opts->add( 'limit', 50 );
  55                 $opts->add( 'from', 0 );
  56                 $opts->add( 'back', 0 );
  57                 $opts->add( 'hideredirs', false );
  58                 $opts->add( 'hidetrans', false );
  59                 $opts->add( 'hidelinks', false );
  60                 $opts->add( 'hideimages', false );
  61
  62                 $opts->fetchValuesFromRequest( $wgRequest );
  63                 $opts->validateIntBounds( 'limit', 0, 5000 );
  64
  65                 // Give precedence to subpage syntax
  66                 if ( isset($par) ) {
  67                         $opts->setValue( 'target', $par );
  68                 }
  69
  70                 // Bind to member variable
  71                 $this->opts = $opts;
  72
  73                 $this->target = Title::newFromURL( $opts->getValue( 'target' ) );
  74                 if( !$this->target ) {
  75                         $wgOut->addHTML( $this->whatlinkshereForm() );
  76                         return;
  77                 }
  78
  79                 $this->skin->setRelevantTitle( $this->target );
  80
  81
  82                 $this->selfTitle = $this->getTitle( $this->target->getPrefixedDBkey() );
  83
  84                 $wgOut->setPageTitle( wfMsg( 'whatlinkshere-title', $this->target->getPrefixedText() ) );
  85                 $wgOut->setSubtitle( wfMsg( 'whatlinkshere-backlink', $this->skin->link( $this->target, $this->target->getPrefixedText(), array(), array( 'redirect' => 'no'  ) ) ) );
  86
  87                 $this->showIndirectLinks( 0, $this->target, $opts->getValue( 'limit' ),
  88                         $opts->getValue( 'from' ), $opts->getValue( 'back' ) );
  89         }
  90
  91         /**
  92          * @param $level  int     Recursion level
  93          * @param $target Title   Target title
  94          * @param $limit  int     Number of entries to display
  95          * @param $from   Title   Display from this article ID
  96          * @param $back   Title   Display from this article ID at backwards scrolling
  97          * @private
  98          */
  99         function showIndirectLinks( $level, $target, $limit, $from = 0, $back = 0 ) {
 100                 global $wgOut, $wgMaxRedirectLinksRetrieved;
 101                 $dbr = wfGetDB( DB_SLAVE );
 102                 $options = array();
 103
 104                 $hidelinks = $this->opts->getValue( 'hidelinks' );
 105                 $hideredirs = $this->opts->getValue( 'hideredirs' );
 106                 $hidetrans = $this->opts->getValue( 'hidetrans' );
 107                 $hideimages = $target->getNamespace() != NS_FILE || $this->opts->getValue( 'hideimages' );
 108
 109                 $fetchlinks = (!$hidelinks || !$hideredirs);
 110
 111                 // Make the query
 112                 $plConds = array(
 113                         'page_id=pl_from',
 114                         'pl_namespace' => $target->getNamespace(),
 115                         'pl_title' => $target->getDBkey(),
 116                 );
 117                 if( $hideredirs ) {
 118                         $plConds['page_is_redirect'] = 0;
 119                 } elseif( $hidelinks ) {
 120                         $plConds['page_is_redirect'] = 1;
 121                 }
 122
 123                 $tlConds = array(
 124                         'page_id=tl_from',
 125                         'tl_namespace' => $target->getNamespace(),
 126                         'tl_title' => $target->getDBkey(),
 127                 );
 128
 129                 $ilConds = array(
 130                         'page_id=il_from',
 131                         'il_to' => $target->getDBkey(),
 132                 );
 133
 134                 $namespace = $this->opts->getValue( 'namespace' );
 135                 if ( is_int($namespace) ) {
 136                         $plConds['page_namespace'] = $namespace;
 137                         $tlConds['page_namespace'] = $namespace;
 138                         $ilConds['page_namespace'] = $namespace;
 139                 }
 140
 141                 if ( $from ) {
 142                         $tlConds[] = "tl_from >= $from";
 143                         $plConds[] = "pl_from >= $from";
 144                         $ilConds[] = "il_from >= $from";
 145                 }
 146
 147                 // Read an extra row as an at-end check
 148                 $queryLimit = $limit + 1;
 149
 150                 // Enforce join order, sometimes namespace selector may
 151                 // trigger filesorts which are far less efficient than scanning many entries
 152                 $options[] = 'STRAIGHT_JOIN';
 153
 154                 $options['LIMIT'] = $queryLimit;
 155                 $fields = array( 'page_id', 'page_namespace', 'page_title', 'page_is_redirect' );
 156
 157                 if( $fetchlinks ) {
 158                         $options['ORDER BY'] = 'pl_from';
 159                         $plRes = $dbr->select( array( 'pagelinks', 'page' ), $fields,
 160                                 $plConds, __METHOD__, $options );
 161                 }
 162
 163                 if( !$hidetrans ) {
 164                         $options['ORDER BY'] = 'tl_from';
 165                         $tlRes = $dbr->select( array( 'templatelinks', 'page' ), $fields,
 166                                 $tlConds, __METHOD__, $options );
 167                 }
 168
 169                 if( !$hideimages ) {
 170                         $options['ORDER BY'] = 'il_from';
 171                         $ilRes = $dbr->select( array( 'imagelinks', 'page' ), $fields,
 172                                 $ilConds, __METHOD__, $options );
 173                 }
 174
 175                 if( ( !$fetchlinks || !$dbr->numRows($plRes) ) && ( $hidetrans || !$dbr->numRows($tlRes) ) && ( $hideimages || !$dbr->numRows($ilRes) ) ) {
 176                         if ( 0 == $level ) {
 177                                 $wgOut->addHTML( $this->whatlinkshereForm() );
 178
 179                                 // Show filters only if there are links
 180                                 if( $hidelinks || $hidetrans || $hideredirs || $hideimages )
 181                                         $wgOut->addHTML( $this->getFilterPanel() );
 182
 183                                 $errMsg = is_int($namespace) ? 'nolinkshere-ns' : 'nolinkshere';
 184                                 $wgOut->addWikiMsg( $errMsg, $this->target->getPrefixedText() );
 185                         }
 186                         return;
 187                 }
 188
 189                 // Read the rows into an array and remove duplicates
 190                 // templatelinks comes second so that the templatelinks row overwrites the
 191                 // pagelinks row, so we get (inclusion) rather than nothing
 192                 if( $fetchlinks ) {
 193                         foreach ( $plRes as $row ) {
 194                                 $row->is_template = 0;
 195                                 $row->is_image = 0;
 196                                 $rows[$row->page_id] = $row;
 197                         }
 198                 }
 199                 if( !$hidetrans ) {
 200                         foreach ( $tlRes as $row ) {
 201                                 $row->is_template = 1;
 202                                 $row->is_image = 0;
 203                                 $rows[$row->page_id] = $row;
 204                         }
 205                 }
 206                 if( !$hideimages ) {
 207                         foreach ( $ilRes as $row ) {
 208                                 $row->is_template = 0;
 209                                 $row->is_image = 1;
 210                                 $rows[$row->page_id] = $row;
 211                         }
 212                 }
 213
 214                 // Sort by key and then change the keys to 0-based indices
 215                 ksort( $rows );
 216                 $rows = array_values( $rows );
 217
 218                 $numRows = count( $rows );
 219
 220                 // Work out the start and end IDs, for prev/next links
 221                 if ( $numRows > $limit ) {
 222                         // More rows available after these ones
 223                         // Get the ID from the last row in the result set
 224                         $nextId = $rows[$limit]->page_id;
 225                         // Remove undisplayed rows
 226                         $rows = array_slice( $rows, 0, $limit );
 227                 } else {
 228                         // No more rows after
 229                         $nextId = false;
 230                 }
 231                 $prevId = $from;
 232
 233                 if ( $level == 0 ) {
 234                         $wgOut->addHTML( $this->whatlinkshereForm() );
 235                         $wgOut->addHTML( $this->getFilterPanel() );
 236                         $wgOut->addWikiMsg( 'linkshere', $this->target->getPrefixedText() );
 237
 238                         $prevnext = $this->getPrevNext( $prevId, $nextId );
 239                         $wgOut->addHTML( $prevnext );
 240                 }
 241
 242                 $wgOut->addHTML( $this->listStart( $level ) );
 243                 foreach ( $rows as $row ) {
 244                         $nt = Title::makeTitle( $row->page_namespace, $row->page_title );
 245
 246                         if ( $row->page_is_redirect && $level < 2 ) {
 247                                 $wgOut->addHTML( $this->listItem( $row, $nt, true ) );
 248                                 $this->showIndirectLinks( $level + 1, $nt, $wgMaxRedirectLinksRetrieved );
 249                                 $wgOut->addHTML( Xml::closeElement( 'li' ) );
 250                         } else {
 251                                 $wgOut->addHTML( $this->listItem( $row, $nt ) );
 252                         }
 253                 }
 254
 255                 $wgOut->addHTML( $this->listEnd() );
 256
 257                 if( $level == 0 ) {
 258                         $wgOut->addHTML( $prevnext );
 259                 }
 260         }
 261
 262         protected function listStart( $level ) {
 263                 return Xml::openElement( 'ul', ( $level ? array() : array( 'id' => 'mw-whatlinkshere-list' ) ) );
 264         }
 265
 266         protected function listItem( $row, $nt, $notClose = false ) {
 267                 # local message cache
 268                 static $msgcache = null;
 269                 if ( $msgcache === null ) {
 270                         static $msgs = array( 'isredirect', 'istemplate', 'semicolon-separator',
 271                                 'whatlinkshere-links', 'isimage' );
 272                         $msgcache = array();
 273                         foreach ( $msgs as $msg ) {
 274                                 $msgcache[$msg] = wfMsgExt( $msg, array( 'escapenoentities' ) );
 275                         }
 276                 }
 277
 278                 if( $row->page_is_redirect ) {
 279                         $query = array( 'redirect' => 'no' );
 280                 } else {
 281                         $query = array();
 282                 }
 283
 284                 $link = $this->skin->linkKnown(
 285                         $nt,
 286                         null,
 287                         array(),
 288                         $query
 289                 );
 290
 291                 // Display properties (redirect or template)
 292                 $propsText = '';
 293                 $props = array();
 294                 if ( $row->page_is_redirect )
 295                         $props[] = $msgcache['isredirect'];
 296                 if ( $row->is_template )
 297                         $props[] = $msgcache['istemplate'];
 298                 if( $row->is_image )
 299                         $props[] = $msgcache['isimage'];
 300
 301                 if ( count( $props ) ) {
 302                         $propsText = '(' . implode( $msgcache['semicolon-separator'], $props ) . ')';
 303                 }
 304
 305                 # Space for utilities links, with a what-links-here link provided
 306                 $wlhLink = $this->wlhLink( $nt, $msgcache['whatlinkshere-links'] );
 307                 $wlh = Xml::wrapClass( "($wlhLink)", 'mw-whatlinkshere-tools' );
 308
 309                 return $notClose ?
 310                         Xml::openElement( 'li' ) . "$link $propsText $wlh\n" :
 311                         Xml::tags( 'li', null, "$link $propsText $wlh" ) . "\n";
 312         }
 313
 314         protected function listEnd() {
 315                 return Xml::closeElement( 'ul' );
 316         }
 317
 318         protected function wlhLink( Title $target, $text ) {
 319                 static $title = null;
 320                 if ( $title === null )
 321                         $title = $this->getTitle();
 322
 323                 return $this->skin->linkKnown(
 324                         $title,
 325                         $text,
 326                         array(),
 327                         array( 'target' => $target->getPrefixedText() )
 328                 );
 329         }
 330
 331         function makeSelfLink( $text, $query ) {
 332                 return $this->skin->linkKnown(
 333                         $this->selfTitle,
 334                         $text,
 335                         array(),
 336                         $query
 337                 );
 338         }
 339
 340         function getPrevNext( $prevId, $nextId ) {
 341                 global $wgLang;
 342                 $currentLimit = $this->opts->getValue( 'limit' );
 343                 $fmtLimit = $wgLang->formatNum( $currentLimit );
 344                 $prev = wfMsgExt( 'whatlinkshere-prev', array( 'parsemag', 'escape' ), $fmtLimit );
 345                 $next = wfMsgExt( 'whatlinkshere-next', array( 'parsemag', 'escape' ), $fmtLimit );
 346
 347                 $changed = $this->opts->getChangedValues();
 348                 unset($changed['target']); // Already in the request title
 349
 350                 if ( 0 != $prevId ) {
 351                         $overrides = array( 'from' => $this->opts->getValue( 'back' ) );
 352                         $prev = $this->makeSelfLink( $prev, array_merge( $changed, $overrides ) );
 353                 }
 354                 if ( 0 != $nextId ) {
 355                         $overrides = array( 'from' => $nextId, 'back' => $prevId );
 356                         $next = $this->makeSelfLink( $next, array_merge( $changed, $overrides ) );
 357                 }
 358
 359                 $limitLinks = array();
 360                 foreach ( $this->limits as $limit ) {
 361                         $prettyLimit = $wgLang->formatNum( $limit );
 362                         $overrides = array( 'limit' => $limit );
 363                         $limitLinks[] = $this->makeSelfLink( $prettyLimit, array_merge( $changed, $overrides ) );
 364                 }
 365
 366                 $nums = $wgLang->pipeList( $limitLinks );
 367
 368                 return wfMsgHtml( 'viewprevnext', $prev, $next, $nums );
 369         }
 370
 371         function whatlinkshereForm() {
 372                 global $wgScript;
 373
 374                 // We get nicer value from the title object
 375                 $this->opts->consumeValue( 'target' );
 376                 // Reset these for new requests
 377                 $this->opts->consumeValues( array( 'back', 'from' ) );
 378
 379                 $target = $this->target ? $this->target->getPrefixedText() : '';
 380                 $namespace = $this->opts->consumeValue( 'namespace' );
 381
 382                 # Build up the form
 383                 $f = Xml::openElement( 'form', array( 'action' => $wgScript ) );
 384
 385                 # Values that should not be forgotten
 386                 $f .= Html::hidden( 'title', $this->getTitle()->getPrefixedText() );
 387                 foreach ( $this->opts->getUnconsumedValues() as $name => $value ) {
 388                         $f .= Html::hidden( $name, $value );
 389                 }
 390
 391                 $f .= Xml::fieldset( wfMsg( 'whatlinkshere' ) );
 392
 393                 # Target input
 394                 $f .= Xml::inputLabel( wfMsg( 'whatlinkshere-page' ), 'target',
 395                                 'mw-whatlinkshere-target', 40, $target );
 396
 397                 $f .= ' ';
 398
 399                 # Namespace selector
 400                 $f .= Xml::label( wfMsg( 'namespace' ), 'namespace' ) . '&#160;' .
 401                         Xml::namespaceSelector( $namespace, '' );
 402
 403                 $f .= ' ';
 404
 405                 # Submit
 406                 $f .= Xml::submitButton( wfMsg( 'allpagessubmit' ) );
 407
 408                 # Close
 409                 $f .= Xml::closeElement( 'fieldset' ) . Xml::closeElement( 'form' ) . "\n";
 410
 411                 return $f;
 412         }
 413
 414         /**
 415          * Create filter panel
 416          *
 417          * @return string HTML fieldset and filter panel with the show/hide links
 418          */
 419         function getFilterPanel() {
 420                 global $wgLang;
 421                 $show = wfMsgHtml( 'show' );
 422                 $hide = wfMsgHtml( 'hide' );
 423
 424                 $changed = $this->opts->getChangedValues();
 425                 unset($changed['target']); // Already in the request title
 426
 427                 $links = array();
 428                 $types = array( 'hidetrans', 'hidelinks', 'hideredirs' );
 429                 if( $this->target->getNamespace() == NS_FILE )
 430                         $types[] = 'hideimages';
 431
 432                 // Combined message keys: 'whatlinkshere-hideredirs', 'whatlinkshere-hidetrans', 'whatlinkshere-hidelinks', 'whatlinkshere-hideimages'
 433                 // To be sure they will be find by grep
 434                 foreach( $types as $type ) {
 435                         $chosen = $this->opts->getValue( $type );
 436                         $msg = $chosen ? $show : $hide;
 437                         $overrides = array( $type => !$chosen );
 438                         $links[] =  wfMsgHtml( "whatlinkshere-{$type}", $this->makeSelfLink( $msg, array_merge( $changed, $overrides ) ) );
 439                 }
 440                 return Xml::fieldset( wfMsg( 'whatlinkshere-filters' ), $wgLang->pipeList( $links ) );
 441         }
 442 }