Switch to adjacent buffer with alt+arrow

Use alt+up and alt+down to switch to previous / next buffer.
Works when bufferlist is nested or flat.

This implements issue #511.

js/glowingbear.js

@@ -727,6 +727,18 @@ weechat.controller('WeechatCtrl', ['$rootScope', '$scope', '$store', '$timeout',
         settings.nonicklist = !settings.nonicklist;
     };
 
+    $rootScope.switchToAdjacentBuffer = function(direction) {
+        // direction is +1 for next buffer, -1 for previous buffer
+        var sortedBuffers = _.sortBy($scope.getBuffers(), $rootScope.predicate);
+        var activeBuffer = models.getActiveBuffer();
+        var index = sortedBuffers.indexOf(activeBuffer);
+        if (index >= 0) {
+            var newBuffer = sortedBuffers[index + direction];
+            if (newBuffer) {
+                $scope.setActiveBuffer(newBuffer.id);
+            }
+        }
+    };
 
     $scope.handleSearchBoxKey = function($event) {
         // Support different browser quirks

js/inputbar.js

@@ -294,6 +294,14 @@ weechat.directive('inputBar', function() {
                     return true;
                 }
 
+                // Alt+Arrow up/down -> switch to prev/next adjacent buffer
+                if ($event.altKey && !$event.ctrlKey && (code === 38 || code === 40)) {
+                    $event.preventDefault();
+                    var direction = code - 39;
+                    $rootScope.switchToAdjacentBuffer(direction);
+                    return true;
+                }
+
                 // Alt+L -> focus on input bar
                 if ($event.altKey && (code === 76 || code === 108)) {
                     $event.preventDefault();

js/models.js

@@ -84,7 +84,7 @@ models.service('models', ['$rootScope', '$filter', function($rootScope, $filter)
         var notification = 0;
         var unread = 0;
         var lastSeen = -1;
-        var serverSortKey = fullName.replace(/^irc\.server\.(\w+)/, "irc.$1");
+        var serverSortKey = fullName.replace(/^irc\.server\.(\w+)/, "irc.$1").toLowerCase();
         // There are two kinds of types: bufferType (free vs formatted) and
         // the kind of type that distinguishes queries from channels etc
         var bufferType = message.type;