Basic language selector

* uses setlang attribute in URL to switch language
* introduced a language filter widget by extending
  jquery.ui.autocomplete
* UI rendering is done by using SkinAfterContent hook

Change-Id: Ifa63a04ba1d060b6db8fba14bb868045cf6b97c3

UniversalLanguageSelector.php

@@ -1,7 +1,7 @@
 <?php
 /**
  * Universal Language Selector extension
- * https://www.mediawiki.org/wiki/UniversalLanguageSelector
+ * https://www.mediawiki.org/wiki/Universal_Language_Selector
  *
  * @file
  * @ingroup Extensions
@@ -24,7 +24,7 @@ $wgExtensionCredits['other'][] = array(
 	'descriptionmsg' => 'uls-desc',
 );
 
-$dir = dirname( __FILE__ );
+$dir = __DIR__ ;
 
 // Internationalization
 $wgExtensionMessagesFiles['UniversalLanguageSelector'] = "$dir/UniversalLanguageSelector.i18n.php";
@@ -34,6 +34,7 @@ $wgAutoloadClasses['UniversalLanguageSelectorHooks'] = "$dir/UniversalLanguageSe
 
 $wgHooks['BeforePageDisplay'][] = 'UniversalLanguageSelectorHooks::addModules';
 $wgHooks['PersonalUrls'][] = 'UniversalLanguageSelectorHooks::addTrigger';
+$wgHooks['SkinAfterContent'][] = 'UniversalLanguageSelectorHooks::addTemplate';
 
 $wgResourceModules['ext.uls.init'] = array(
 	'scripts' => 'resources/ext.uls.init.js',
@@ -44,15 +45,14 @@ $wgResourceModules['ext.uls.init'] = array(
 );
 
 $wgResourceModules['ext.uls.core'] = array(
-	'scripts' => array( 'resources/ext.uls.core.js' ),
+	'scripts' => array( 'resources/ext.uls.core.js', 'resources/ext.uls.languagefilter.js' ),
 	'styles' => 'resources/css/ext.uls.css',
 	'localBasePath' => $dir,
 	'remoteExtPath' => 'UniversalLanguageSelector',
 	'dependencies' => array(
 		'mediawiki.util',
-	),
-	'messages' => array(
-		'uls-select-content-language',
+		'mediawiki.Uri',
+		'jquery.ui.autocomplete'
 	),
 	'position' => 'top',
 );