Code cleanup part #1: move all the services and directive JS code in the app.js file into its own files

static/js/directives/ui/usage-chart.js

@@ -0,0 +1,50 @@
+/**
+ * An element which displays a donut chart, along with warnings if the limit is close to being
+ * reached.
+ */
+angular.module('quay').directive('usageChart', function () {
+  var directiveDefinitionObject = {
+    priority: 0,
+    templateUrl: '/static/directives/usage-chart.html',
+    replace: false,
+    transclude: false,
+    restrict: 'C',
+    scope: {
+      'current': '=current',
+      'total': '=total',
+      'limit': '=limit',
+      'usageTitle': '@usageTitle'
+    },
+    controller: function($scope, $element) {
+      $scope.limit = "";
+
+      var chart = null;
+
+      var update = function() {
+        if ($scope.current == null || $scope.total == null) { return; }
+        if (!chart) {
+          chart = new UsageChart();
+          chart.draw('usage-chart-element');
+        }
+
+        var current = $scope.current || 0;
+        var total = $scope.total || 0;
+        if (current > total) {
+          $scope.limit = 'over';
+        } else if (current == total) {
+          $scope.limit = 'at';
+        } else if (current >= total * 0.7) {
+          $scope.limit = 'near';
+        } else {
+          $scope.limit = 'none';
+        }
+
+        chart.update($scope.current, $scope.total);
+      };
+
+      $scope.$watch('current', update);
+      $scope.$watch('total', update);
+    }
+  };
+  return directiveDefinitionObject;
+});