chore: Make graph visible in GUI, and show a proper error message

Related to issue #65

README.md

@@ -1,7 +1,5 @@
 # Pimcore - Workflow GUI
 
-> I, Dominik ([@pfaffenbauer](https://github.com/dpfaffenbauer)), will stop maintaining this form now on and will continue to work on this fork [https://github.com/cors-gmbh/pimcore-workflow-gui](https://github.com/cors-gmbh/pimcore-workflow-gui)
-
 ## Requirements
  - Pimcore 10.0.x
 

src/WorkflowGui/Controller/WorkflowController.php

@@ -339,9 +339,14 @@ private function getVisualization($workflow, $format): string
             throw new \InvalidArgumentException($this->trans('workflow_cmd_not_found', ['dot']));
         }
 
+        $workflowRepository = $this->repository->find($workflow);
+
+        if ($workflowRepository && !$workflowRepository['enabled']) {
+            throw new \InvalidArgumentException($this->trans('workflow_gui_enable_message'));
+        }
+
         $cmd = $php.' '.PIMCORE_PROJECT_ROOT.'/bin/console --env="${:arg_environment}" pimcore:workflow:dump "${:arg_workflow}" | '.$dot.' -T"${:arg_format}"';
 
-        $cmd = Console::addLowProcessPriority($cmd);
         $process = Process::fromShellCommandline($cmd);
         $process->run(null, [
             'arg_environment' => $this->kernel->getEnvironment(),

src/WorkflowGui/Resources/translations/admin.en.yml

@@ -114,3 +114,4 @@ workflow_gui: 'Workflow GUI'
 workflow_problem_creating_workflow_invalid_characters: 'Please use only these characters: "a-z", "A-Z" and "_"'
 workflow_gui_workflow_with_name_already_exists: 'Workflow with bane already exists'
 workflow_gui_clone: 'Clone'
+workflow_gui_enable_message: 'Please enable and save the workflow to display graph visualization.'