Show languages from the Babel box on the user page

Bug: T135371
Change-Id: Ieeaf446326be93a779df3e6bd7a8dca899950a6c

UniversalLanguageSelector.hooks.php

@@ -350,11 +350,25 @@ class UniversalLanguageSelectorHooks {
 
 		// Place request context dependent stuff here
 
+		$user = $out->getUser();
+		$loggedIn = $user->isLoggedIn();
+
 		// Do not output accept languages if there is risk it will get cached accross requests
-		if ( $wgULSAnonCanChangeLanguage || $out->getUser()->isLoggedIn() ) {
+		if ( $wgULSAnonCanChangeLanguage || $loggedIn ) {
 			$vars['wgULSAcceptLanguageList'] = array_keys( $out->getRequest()->getAcceptLang() );
 		}
 
+		if ( $loggedIn && class_exists( Babel::class ) ) {
+			$userLanguageInfo = Babel::getCachedUserLanguageInfo( $user );
+
+			// This relies on the fact that Babel levels are 'N' and
+			// the digits 0 to 5 as strings, and that in reverse
+			// ASCII order they will be 'N', '5', '4', '3', '2', '1', '0'.
+			arsort( $userLanguageInfo );
+
+			$vars['wgULSBabelLanguages'] = array_keys( $userLanguageInfo );
+		}
+
 		// An optimization to avoid loading all of uls.data just to get the autonym
 		$langCode = $out->getLanguage()->getCode();
 		$vars['wgULSCurrentAutonym'] = Language::fetchLanguageName( $langCode );

resources/js/ext.uls.compactlinks.js

@@ -247,6 +247,8 @@
 			// Previous languages are always the better suggestion
 			// because the user has explicitly chosen them.
 			filterByPreviousLanguages,
+			// User's languages in the Babel box on the user page
+			filterByBabelLanguages,
 			// Site specific highlights, mostly used on Wikimedia sites
 			filterBySitePicks,
 			// Add all common languages to the beginning of array.
@@ -305,6 +307,20 @@
 		} );
 	}
 
+	/**
+	 * Filter by languages that appear in the Babel box on the user page.
+	 *
+	 * @param {string[]} languages Language codes
+	 * @return {string[]} List of language codes supported by the article
+	 */
+	function filterByBabelLanguages( languages ) {
+		var babelLanguages = mw.config.get( 'wgULSBabelLanguages', [] );
+
+		return $.grep( babelLanguages, function ( language ) {
+			return $.inArray( language, languages ) >= 0;
+		} );
+	}
+
 	/**
 	 * Filter the language list by site picks.
 	 *
@@ -312,7 +328,7 @@
 	 * @return {string[]} List of language codes supported by the article
 	 */
 	function filterBySitePicks( languages ) {
-		var picks = mw.config.get( 'wgULSCompactLinksPrepend' ) || [];
+		var picks = mw.config.get( 'wgULSCompactLinksPrepend', [] );
 
 		return $.grep( picks, function ( language ) {
 			return $.inArray( language, languages ) >= 0;