Inform about commands not found

client/src/js/middleware/command.js

@@ -1,17 +1,28 @@
+import { inform } from '../actions/message';
+
+const notFound = 'commandNotFound';
+
+function createContext({ dispatch, getState }, { server, channel }) {
+  return { dispatch, getState, server, channel };
+}
+
 export default function createCommandMiddleware(type, handlers) {
-  return ({ dispatch, getState }) => next => action => {
+  return store => next => action => {
     if (action.type === type) {
       const words = action.command.slice(1).split(' ');
       const command = words[0];
       const params = words.slice(1);
 
+      let result;
+
       if (command in handlers) {
-        handlers[command]({
-          dispatch,
-          getState,
-          server: action.server,
-          channel: action.channel
-        }, ...params);
+        result = handlers[command](createContext(store, action), ...params);
+      } else if (notFound in handlers) {
+        result = handlers[notFound](createContext(store, action), command);
+      }
+
+      if (typeof result === 'string' || Array.isArray(result)) {
+        store.dispatch(inform(result, action.server, action.channel));
       }
     }