test: add auto-save module

test/spec/auto-save/index.js

@@ -0,0 +1,68 @@
+var LOW_PRIORITY = 250;
+
+/**
+ * Saves the diagram, on change.
+ *
+ * @constructor
+ *
+ * @param {didi.Injector} injector
+ * @param {Object} config save config
+ *
+ * @example
+ *
+ * ```javascript
+ * // once used, components may safely hook into `saveXML.done`
+ * // to get notified on every save
+ *
+ * const modeler = new BpmnModeler({
+ *   additionalModules: [
+ *     AutoSaveModule
+ *   ]
+ * });
+ *
+ * modeler.on('saveXML.done', function(event) {
+ *   const {
+ *     error,
+ *     xml
+ *   } = event;
+ *
+ *   // ...
+ * });
+ * ```
+ */
+function AutoSave(injector, config) {
+
+  config = config || { format: true };
+
+  var parent = injector.get('_parent', false);
+
+  var modeler = parent || injector.get('bpmnjs', false) || injector.get('cmmnjs');
+
+  if (!modeler) {
+    throw new Error('no modeler context');
+  }
+
+  var eventBus = parent && parent._eventBus || injector.get('eventBus');
+
+  function subscribeChanged() {
+    eventBus.once('commandStack.changed', LOW_PRIORITY, function() {
+      modeler.saveXML(config)
+        .catch(function(error) {
+          console.error('[auto-save] failed', error);
+        })
+        .finally(subscribeChanged);
+    });
+  }
+
+  subscribeChanged();
+}
+
+AutoSave.$inject = [ 'injector', 'config.autoSave' ];
+
+
+export default {
+  __init__: [
+    'autoSave'
+  ],
+  autoSave: [ 'type', AutoSave ]
+};