User:Ilmari Karonen/MetaKeywords

<?php
 
$wgExtensionCredits['other'][] = array(
        'path' => __FILE__,
        'name' => "MetaKeywords",
        'description' => "Adds back the automatically generated meta keywords removed in r53482.",
        'version' => 1.0,
        'author' => "Ilmari Karonen",
        'url' => "http://www.mediawiki.org/wiki/User:Ilmari_Karonen/MetaKeywords",
);
 
$wgHooks['OutputPageParserOutput'][] = 'addMetaKeywords';
 
/**
 * This function takes the title (first item of mGoodLinks), categories,
 * existing and broken links for the page
 * and uses the first 10 of them for META keywords
 *
 * It's based on the code Brion removed in r53482, converted into an
 * OutputPageParserOutput hook by replacing $this with $out.  See bug
 * 19761 on bugzilla for details.
 *
 * @param OutputPage $out
 * @param ParserOutput $parserOutput
 */
function addMetaKeywords( $out, $parserOutput ) {
        global $wgContLang;
        // Get an array of keywords if there are more than one
        // variant of the site language
        $text = $wgContLang->autoConvertToAllVariants( $out->getTitle()->getPrefixedText());
        // array_values: We needn't to merge variant's code name
        // into $out->mKeywords;
        // array_unique: We should insert a keyword just for once
        if( is_array( $text ))
                $text = array_unique( array_values( $text ));
        $out->addKeyword( $text );
        $count = 1;
        $links2d =& $parserOutput->getLinks();
        if ( !is_array( $links2d ) ) {
                return;
        }
        foreach ( $links2d as $dbkeys ) {
                foreach( $dbkeys as $dbkey => $unused ) {
                        $dbkey = $wgContLang->autoConvertToAllVariants( $dbkey );
                        if( is_array( $dbkey ))
                                $dbkey = array_unique( array_values( $dbkey ));
                        $out>addKeyword( $dbkey );
                        if ( ++$count > 10 ) {
                                break 2;
                        }
                }
        }
}