mw.Upload.BookletLayout: Better handle error messages from AbuseFilter and TitleBlacklist

[lhc/web/wiklou.git] / resources / src / mediawiki / api / messages.js

diff --git a/resources/src/mediawiki/api/messages.js b/resources/src/mediawiki/api/messages.js
index df21eb2..9ba562e 100644 (file)
--- a/resources/src/mediawiki/api/messages.js
+++ b/resources/src/mediawiki/api/messages.js
@@ -44,6 +44,25 @@
                 */
                loadMessages: function ( messages ) {
                        return this.getMessages( messages ).then( $.proxy( mw.messages, 'set' ) );
+               },
+
+               /**
+                * Loads a set of mesages and add them to mw.messages. Only messages that are not already known
+                * are loaded. If all messages are known, the returned promise is resolved immediately.
+                *
+                * @param {Array} messages Messages to retrieve
+                * @return {jQuery.Promise}
+                */
+               loadMessagesIfMissing: function ( messages ) {
+                       var missing = messages.filter( function ( msg ) {
+                               return !mw.message( msg ).exists();
+                       } );
+
+                       if ( missing.length === 0 ) {
+                               return $.Deferred().resolve();
+                       }
+
+                       return this.getMessages( missing ).then( $.proxy( mw.messages, 'set' ) );
                }
        } );