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         /**
  32          * @var FormOptions
  33          */
  34         protected $opts;
  35
  36         protected $selfTitle;
  37
  38         /**
  39          * @var Title
  40          */
  41         protected $target;
  42
  43         protected $limits = array( 20, 50, 100, 250, 500 );
  44
  45         public function __construct() {
  46                 parent::__construct( 'Whatlinkshere' );
  47         }
  48
  49         function execute( $par ) {
  50                 global $wgWhatlinkshereLimit;
  51                 $out = $this->getOutput();
  52
  53                 $this->setHeaders();
  54
  55                 $opts = new FormOptions();
  56
  57                 $opts->add( 'target', '' );
  58                 $opts->add( 'namespace', '', FormOptions::INTNULL );
  59                 $opts->add( 'limit', $wgWhatlinkshereLimit );
  60                 $opts->add( 'from', 0 );
  61                 $opts->add( 'back', 0 );
  62                 $opts->add( 'hideredirs', false );
  63                 $opts->add( 'hidetrans', false );
  64                 $opts->add( 'hidelinks', false );
  65                 $opts->add( 'hideimages', false );
  66
  67                 $opts->fetchValuesFromRequest( $this->getRequest() );
  68                 $opts->validateIntBounds( 'limit', 0, 5000 );
  69
  70                 // Give precedence to subpage syntax
  71                 if ( isset($par) ) {
  72                         $opts->setValue( 'target', $par );
  73                 }
  74
  75                 // Bind to member variable
  76                 $this->opts = $opts;
  77
  78                 $this->target = Title::newFromURL( $opts->getValue( 'target' ) );
  79                 if( !$this->target ) {
  80                         $out->addHTML( $this->whatlinkshereForm() );
  81                         return;
  82                 }
  83
  84                 $this->getSkin()->setRelevantTitle( $this->target );
  85
  86
  87                 $this->selfTitle = $this->getTitle( $this->target->getPrefixedDBkey() );
  88
  89                 $out->setPageTitle( wfMsg( 'whatlinkshere-title', $this->target->getPrefixedText() ) );
  90                 $out->setSubtitle( wfMsg( 'whatlinkshere-backlink', Linker::link( $this->target, $this->target->getPrefixedText(), array(), array( 'redirect' => 'no'  ) ) ) );
  91
  92                 $this->showIndirectLinks( 0, $this->target, $opts->getValue( 'limit' ),
  93                         $opts->getValue( 'from' ), $opts->getValue( 'back' ) );
  94         }
  95
  96         /**
  97          * @param $level int     Recursion level
  98          * @param $target Title   Target title
  99          * @param $limit int     Number of entries to display
 100          * @param $from Title   Display from this article ID
 101          * @param $back Title   Display from this article ID at backwards scrolling
 102          */
 103         function showIndirectLinks( $level, $target, $limit, $from = 0, $back = 0 ) {
 104                 global $wgMaxRedirectLinksRetrieved;
 105                 $out = $this->getOutput();
 106                 $dbr = wfGetDB( DB_SLAVE );
 107                 $options = array();
 108
 109                 $hidelinks = $this->opts->getValue( 'hidelinks' );
 110                 $hideredirs = $this->opts->getValue( 'hideredirs' );
 111                 $hidetrans = $this->opts->getValue( 'hidetrans' );
 112                 $hideimages = $target->getNamespace() != NS_FILE || $this->opts->getValue( 'hideimages' );
 113
 114                 $fetchlinks = (!$hidelinks || !$hideredirs);
 115
 116                 // Make the query
 117                 $plConds = array(
 118                         'page_id=pl_from',
 119                         'pl_namespace' => $target->getNamespace(),
 120                         'pl_title' => $target->getDBkey(),
 121                 );
 122                 if( $hideredirs ) {
 123                         $plConds['page_is_redirect'] = 0;
 124                 } elseif( $hidelinks ) {
 125                         $plConds['page_is_redirect'] = 1;
 126                 }
 127
 128                 $tlConds = array(
 129                         'page_id=tl_from',
 130                         'tl_namespace' => $target->getNamespace(),
 131                         'tl_title' => $target->getDBkey(),
 132                 );
 133
 134                 $ilConds = array(
 135                         'page_id=il_from',
 136                         'il_to' => $target->getDBkey(),
 137                 );
 138
 139                 $namespace = $this->opts->getValue( 'namespace' );
 140                 if ( is_int($namespace) ) {
 141                         $plConds['page_namespace'] = $namespace;
 142                         $tlConds['page_namespace'] = $namespace;
 143                         $ilConds['page_namespace'] = $namespace;
 144                 }
 145
 146                 if ( $from ) {
 147                         $tlConds[] = "tl_from >= $from";
 148                         $plConds[] = "pl_from >= $from";
 149                         $ilConds[] = "il_from >= $from";
 150                 }
 151
 152                 // Read an extra row as an at-end check
 153                 $queryLimit = $limit + 1;
 154
 155                 // Enforce join order, sometimes namespace selector may
 156                 // trigger filesorts which are far less efficient than scanning many entries
 157                 $options[] = 'STRAIGHT_JOIN';
 158
 159                 $options['LIMIT'] = $queryLimit;
 160                 $fields = array( 'page_id', 'page_namespace', 'page_title', 'page_is_redirect' );
 161
 162                 if( $fetchlinks ) {
 163                         $options['ORDER BY'] = 'pl_from';
 164                         $plRes = $dbr->select( array( 'pagelinks', 'page' ), $fields,
 165                                 $plConds, __METHOD__, $options );
 166                 }
 167
 168                 if( !$hidetrans ) {
 169                         $options['ORDER BY'] = 'tl_from';
 170                         $tlRes = $dbr->select( array( 'templatelinks', 'page' ), $fields,
 171                                 $tlConds, __METHOD__, $options );
 172                 }
 173
 174                 if( !$hideimages ) {
 175                         $options['ORDER BY'] = 'il_from';
 176                         $ilRes = $dbr->select( array( 'imagelinks', 'page' ), $fields,
 177                                 $ilConds, __METHOD__, $options );
 178                 }
 179
 180                 if( ( !$fetchlinks || !$dbr->numRows($plRes) ) && ( $hidetrans || !$dbr->numRows($tlRes) ) && ( $hideimages || !$dbr->numRows($ilRes) ) ) {
 181                         if ( 0 == $level ) {
 182                                 $out->addHTML( $this->whatlinkshereForm() );
 183
 184                                 // Show filters only if there are links
 185                                 if( $hidelinks || $hidetrans || $hideredirs || $hideimages )
 186                                         $out->addHTML( $this->getFilterPanel() );
 187
 188                                 $errMsg = is_int($namespace) ? 'nolinkshere-ns' : 'nolinkshere';
 189                                 $out->addWikiMsg( $errMsg, $this->target->getPrefixedText() );
 190                         }
 191                         return;
 192                 }
 193
 194                 // Read the rows into an array and remove duplicates
 195                 // templatelinks comes second so that the templatelinks row overwrites the
 196                 // pagelinks row, so we get (inclusion) rather than nothing
 197                 if( $fetchlinks ) {
 198                         foreach ( $plRes as $row ) {
 199                                 $row->is_template = 0;
 200                                 $row->is_image = 0;
 201                                 $rows[$row->page_id] = $row;
 202                         }
 203                 }
 204                 if( !$hidetrans ) {
 205                         foreach ( $tlRes as $row ) {
 206                                 $row->is_template = 1;
 207                                 $row->is_image = 0;
 208                                 $rows[$row->page_id] = $row;
 209                         }
 210                 }
 211                 if( !$hideimages ) {
 212                         foreach ( $ilRes as $row ) {
 213                                 $row->is_template = 0;
 214                                 $row->is_image = 1;
 215                                 $rows[$row->page_id] = $row;
 216                         }
 217                 }
 218
 219                 // Sort by key and then change the keys to 0-based indices
 220                 ksort( $rows );
 221                 $rows = array_values( $rows );
 222
 223                 $numRows = count( $rows );
 224
 225                 // Work out the start and end IDs, for prev/next links
 226                 if ( $numRows > $limit ) {
 227                         // More rows available after these ones
 228                         // Get the ID from the last row in the result set
 229                         $nextId = $rows[$limit]->page_id;
 230                         // Remove undisplayed rows
 231                         $rows = array_slice( $rows, 0, $limit );
 232                 } else {
 233                         // No more rows after
 234                         $nextId = false;
 235                 }
 236                 $prevId = $from;
 237
 238                 if ( $level == 0 ) {
 239                         $out->addHTML( $this->whatlinkshereForm() );
 240                         $out->addHTML( $this->getFilterPanel() );
 241                         $out->addWikiMsg( 'linkshere', $this->target->getPrefixedText() );
 242
 243                         $prevnext = $this->getPrevNext( $prevId, $nextId );
 244                         $out->addHTML( $prevnext );
 245                 }
 246
 247                 $out->addHTML( $this->listStart( $level ) );
 248                 foreach ( $rows as $row ) {
 249                         $nt = Title::makeTitle( $row->page_namespace, $row->page_title );
 250
 251                         if ( $row->page_is_redirect && $level < 2 ) {
 252                                 $out->addHTML( $this->listItem( $row, $nt, true ) );
 253                                 $this->showIndirectLinks( $level + 1, $nt, $wgMaxRedirectLinksRetrieved );
 254                                 $out->addHTML( Xml::closeElement( 'li' ) );
 255                         } else {
 256                                 $out->addHTML( $this->listItem( $row, $nt ) );
 257                         }
 258                 }
 259
 260                 $out->addHTML( $this->listEnd() );
 261
 262                 if( $level == 0 ) {
 263                         $out->addHTML( $prevnext );
 264                 }
 265         }
 266
 267         protected function listStart( $level ) {
 268                 return Xml::openElement( 'ul', ( $level ? array() : array( 'id' => 'mw-whatlinkshere-list' ) ) );
 269         }
 270
 271         protected function listItem( $row, $nt, $notClose = false ) {
 272                 $dirmark = $this->getLang()->getDirMark();
 273
 274                 # local message cache
 275                 static $msgcache = null;
 276                 if ( $msgcache === null ) {
 277                         static $msgs = array( 'isredirect', 'istemplate', 'semicolon-separator',
 278                                 'whatlinkshere-links', 'isimage' );
 279                         $msgcache = array();
 280                         foreach ( $msgs as $msg ) {
 281                                 $msgcache[$msg] = wfMsgExt( $msg, array( 'escapenoentities' ) );
 282                         }
 283                 }
 284
 285                 if( $row->page_is_redirect ) {
 286                         $query = array( 'redirect' => 'no' );
 287                 } else {
 288                         $query = array();
 289                 }
 290
 291                 $link = Linker::linkKnown(
 292                         $nt,
 293                         null,
 294                         array(),
 295                         $query
 296                 );
 297
 298                 // Display properties (redirect or template)
 299                 $propsText = '';
 300                 $props = array();
 301                 if ( $row->page_is_redirect )
 302                         $props[] = $msgcache['isredirect'];
 303                 if ( $row->is_template )
 304                         $props[] = $msgcache['istemplate'];
 305                 if( $row->is_image )
 306                         $props[] = $msgcache['isimage'];
 307
 308                 if ( count( $props ) ) {
 309                         $propsText = '(' . implode( $msgcache['semicolon-separator'], $props ) . ')';
 310                 }
 311
 312                 # Space for utilities links, with a what-links-here link provided
 313                 $wlhLink = $this->wlhLink( $nt, $msgcache['whatlinkshere-links'] );
 314                 $wlh = Xml::wrapClass( "($wlhLink)", 'mw-whatlinkshere-tools' );
 315
 316                 return $notClose ?
 317                         Xml::openElement( 'li' ) . "$link $propsText $dirmark $wlh\n" :
 318                         Xml::tags( 'li', null, "$link $propsText $dirmark $wlh" ) . "\n";
 319         }
 320
 321         protected function listEnd() {
 322                 return Xml::closeElement( 'ul' );
 323         }
 324
 325         protected function wlhLink( Title $target, $text ) {
 326                 static $title = null;
 327                 if ( $title === null )
 328                         $title = $this->getTitle();
 329
 330                 return Linker::linkKnown(
 331                         $title,
 332                         $text,
 333                         array(),
 334                         array( 'target' => $target->getPrefixedText() )
 335                 );
 336         }
 337
 338         function makeSelfLink( $text, $query ) {
 339                 return Linker::linkKnown(
 340                         $this->selfTitle,
 341                         $text,
 342                         array(),
 343                         $query
 344                 );
 345         }
 346
 347         function getPrevNext( $prevId, $nextId ) {
 348                 $currentLimit = $this->opts->getValue( 'limit' );
 349                 $prev = wfMessage( 'whatlinkshere-prev' )->numParams( $currentLimit )->escaped();
 350                 $next = wfMessage( 'whatlinkshere-next' )->numParams( $currentLimit )->escaped();
 351
 352                 $changed = $this->opts->getChangedValues();
 353                 unset($changed['target']); // Already in the request title
 354
 355                 if ( 0 != $prevId ) {
 356                         $overrides = array( 'from' => $this->opts->getValue( 'back' ) );
 357                         $prev = $this->makeSelfLink( $prev, array_merge( $changed, $overrides ) );
 358                 }
 359                 if ( 0 != $nextId ) {
 360                         $overrides = array( 'from' => $nextId, 'back' => $prevId );
 361                         $next = $this->makeSelfLink( $next, array_merge( $changed, $overrides ) );
 362                 }
 363
 364                 $limitLinks = array();
 365                 $lang = $this->getLang();
 366                 foreach ( $this->limits as $limit ) {
 367                         $prettyLimit = htmlspecialchars( $lang->formatNum( $limit ) );
 368                         $overrides = array( 'limit' => $limit );
 369                         $limitLinks[] = $this->makeSelfLink( $prettyLimit, array_merge( $changed, $overrides ) );
 370                 }
 371
 372                 $nums = $lang->pipeList( $limitLinks );
 373
 374                 return wfMsgHtml( 'viewprevnext', $prev, $next, $nums );
 375         }
 376
 377         function whatlinkshereForm() {
 378                 global $wgScript;
 379
 380                 // We get nicer value from the title object
 381                 $this->opts->consumeValue( 'target' );
 382                 // Reset these for new requests
 383                 $this->opts->consumeValues( array( 'back', 'from' ) );
 384
 385                 $target = $this->target ? $this->target->getPrefixedText() : '';
 386                 $namespace = $this->opts->consumeValue( 'namespace' );
 387
 388                 # Build up the form
 389                 $f = Xml::openElement( 'form', array( 'action' => $wgScript ) );
 390
 391                 # Values that should not be forgotten
 392                 $f .= Html::hidden( 'title', $this->getTitle()->getPrefixedText() );
 393                 foreach ( $this->opts->getUnconsumedValues() as $name => $value ) {
 394                         $f .= Html::hidden( $name, $value );
 395                 }
 396
 397                 $f .= Xml::fieldset( wfMsg( 'whatlinkshere' ) );
 398
 399                 # Target input
 400                 $f .= Xml::inputLabel( wfMsg( 'whatlinkshere-page' ), 'target',
 401                                 'mw-whatlinkshere-target', 40, $target );
 402
 403                 $f .= ' ';
 404
 405                 # Namespace selector
 406                 $f .= Xml::label( wfMsg( 'namespace' ), 'namespace' ) . '&#160;' .
 407                         Xml::namespaceSelector( $namespace, '' );
 408
 409                 $f .= ' ';
 410
 411                 # Submit
 412                 $f .= Xml::submitButton( wfMsg( 'allpagessubmit' ) );
 413
 414                 # Close
 415                 $f .= Xml::closeElement( 'fieldset' ) . Xml::closeElement( 'form' ) . "\n";
 416
 417                 return $f;
 418         }
 419
 420         /**
 421          * Create filter panel
 422          *
 423          * @return string HTML fieldset and filter panel with the show/hide links
 424          */
 425         function getFilterPanel() {
 426                 $show = wfMsgHtml( 'show' );
 427                 $hide = wfMsgHtml( 'hide' );
 428
 429                 $changed = $this->opts->getChangedValues();
 430                 unset($changed['target']); // Already in the request title
 431
 432                 $links = array();
 433                 $types = array( 'hidetrans', 'hidelinks', 'hideredirs' );
 434                 if( $this->target->getNamespace() == NS_FILE )
 435                         $types[] = 'hideimages';
 436
 437                 // Combined message keys: 'whatlinkshere-hideredirs', 'whatlinkshere-hidetrans', 'whatlinkshere-hidelinks', 'whatlinkshere-hideimages'
 438                 // To be sure they will be find by grep
 439                 foreach( $types as $type ) {
 440                         $chosen = $this->opts->getValue( $type );
 441                         $msg = $chosen ? $show : $hide;
 442                         $overrides = array( $type => !$chosen );
 443                         $links[] =  wfMsgHtml( "whatlinkshere-{$type}", $this->makeSelfLink( $msg, array_merge( $changed, $overrides ) ) );
 444                 }
 445                 return Xml::fieldset( wfMsg( 'whatlinkshere-filters' ), $this->getLang()->pipeList( $links ) );
 446         }
 447 }