running textgen by an intention

Here is a pretty dirty hack I did. Used it to textgen files to memory and then write them to file myself. Maybe you can use it in some way. But I hope someone else points you to a better solution, because this is really not pretty : 

final DefaultMakeMessageHandler msgHandler = new DefaultMakeMessageHandler(mpsProject); 
msgHandler.clear(); 
MakeSession session = new MakeSession(mpsProject, msgHandler, true); 
if (INSTANCE.get().openNewSession(session)) { 
  IScript scr = new ScriptBuilder().withFacetNames(&Generate, &TextGen, &Make).withFinalTarget(&TextGen:textGenToMemory).toScript(); 
  final Future<IResult> future = INSTANCE.get().make(session, new ModelsToResources(this.currentModule.getModels()).resources(false), scr); 
  ApplicationManager.getApplication().executeOnPooledThread(new Runnable() { 
    public void run() { 
      try { 
        final IResult result = future.get(); 
        final List<TextPreviewFile> previewFiles = new ModelAccessHelper(mpsProject.getModelAccess()).runReadAction(new Computable<List<TextPreviewFile>>() { 
          public List<TextPreviewFile> compute() { 
            ArrayList<TextPreviewFile> rv = new ArrayList<TextPreviewFile>(); 
            foreach tgr in result.output().ofType<TextGenOutcomeResource> { 
              string modelName = NameUtil.compactNamespace(tgr.getModel().getModelName()); 
              for (TextUnit tu : tgr.getTextGenResult().getUnits()) { 
                rv.add(new TextPreviewFile(tu, modelName)); 
              } 
            } 
            return rv; 
          } 
        }); 
         
        ApplicationManager.getApplication().invokeLater(new Runnable() { 
          public void run() { 
            try { 
              long folderTime = TimeUnit.NANOSECONDS.toMicros(System.nanoTime()); 
              String folderString = "//////////outputFolder/Generation/" + folderTime; 
              new File(folderString).mkdir(); 
              for (TextPreviewFile pFile : previewFiles) { 
                FileOutputStream out = new FileOutputStream(folderString + "/" + pFile.getName()); 
                out.write(pFile.contentsToByteArray()); 
                out.close(); 
              } 
              GenerationHelper.self.addGenTime(TimeUnit.NANOSECONDS.toMicros(System.nanoTime())); 
            } catch (FileNotFoundException e) { 
              warn "", e; 
               
            } catch (IOException e) { 
              <no statements> 
            } 
          } 
        }); 
         
        // to update tree to reveal transient models. is it still necessary? 
        ProjectPane.getInstance(mpsProject).rebuild(); 
         
      } catch (Exception e) { 
        msgHandler.handle(new Message(MessageKind.ERROR, "TextPreviewModel", e.toString()).setException(e)); 
      } 
    } 
  }); 
   
  
     
  }); 
   
} else { 
  warn " false"; 
}

Dear Jochen,

Thanks a lot for your response, how do I get the instance to MPS projects you mentioned in the first line? Thanks in advance!

That depends. From where do you want to invoke this code?