Modify CliController for opportunity to extend this class.

app/CliController.php

@@ -46,7 +46,7 @@ class CliController
     public static function getInstance()
     {
         if (!isset(self::$instance)) {
-            self::$instance = new self();
+            self::$instance = new static();
         }
         return self::$instance;
     }
@@ -58,6 +58,15 @@ class CliController
     public function execute($cli)
     {
         try {
+            $this->run($cli);
+        }
+        catch (Exception $e) {
+            $this->exception($e);
+        }
+    }
+
+    protected function run($cli)
+    {
         if (is_string($cli)) {
             if (!class_exists($cli)) {
                 throw new GeneralException('Action class "' . $cli . '" not found.');
@@ -77,7 +86,9 @@ class CliController
             }
         }
     }
-        catch (Exception $e) {
+
+    protected function exception($e)
+    {
         $code = $e->getCode();
         if ($e instanceof ErrorException) {
             $code = $e->getSeverity();
@@ -86,4 +97,3 @@ class CliController
         file_put_contents($this->error_stream, PHP_EOL . 'Stack trace: ' . PHP_EOL . $e->getTraceAsString() . PHP_EOL, FILE_APPEND);
     }
 }
-}