allow '.' in filenames

python/damask/_vtk.py

@@ -197,11 +197,10 @@ class VTK:
         elif isinstance(self.vtk_data,vtk.vtkPolyData):
             writer = vtk.vtkXMLPolyDataWriter()
 
-        default_ext = writer.GetDefaultFileExtension()
+        default_ext = '.'+writer.GetDefaultFileExtension()
         ext = Path(fname).suffix
-        if ext and ext != '.'+default_ext:
-            raise ValueError(f'Given extension "{ext}" does not match default ".{default_ext}"')
-        writer.SetFileName(str(Path(fname).with_suffix('.'+default_ext)))
+        writer.SetFileName(str(fname)+default_ext if default_ext != ext else '')
+
         if compress:
             writer.SetCompressorTypeToZLib()
         else:

python/tests/test_VTK.py

@@ -85,6 +85,12 @@ class TestVTK:
         assert(False)
 
 
+    @pytest.mark.parametrize('fname',['a','a.vtp','a.b','a.b.vtp'])
+    def test_filename_variations(self,tmp_path,fname):
+        points = np.random.rand(102,3)
+        v = VTK.from_poly_data(points)
+        v.save(tmp_path/fname)
+
     @pytest.mark.parametrize('name,dataset_type',[('this_file_does_not_exist.vtk', None),
                                                   ('this_file_does_not_exist.vtk','vtk'),
                                                   ('this_file_does_not_exist.vtx', None)])