vtk.comments as directly accessed property

python/damask/_grid.py

@@ -173,8 +173,8 @@ class Grid:
         Parameters
         ----------
         fname : str or pathlib.Path
-            Grid file to read. Valid extension is .vti, which will be appended
-            if not given.
+            Grid file to read.
+            Valid extension is .vti, which will be appended if not given.
 
         Returns
         -------
@@ -183,14 +183,14 @@ class Grid:
 
         """
         v = VTK.load(fname if str(fname).endswith(('.vti','.vtr')) else str(fname)+'.vti')          # compatibility hack
-        comments = v.get_comments()
         cells = np.array(v.vtk_data.GetDimensions())-1
         bbox  = np.array(v.vtk_data.GetBounds()).reshape(3,2).T
+        comments = v.comments
 
         return Grid(material = v.get('material').reshape(cells,order='F'),
                     size = bbox[1] - bbox[0],
                     origin = bbox[0],
-                    comments=comments)
+                    comments = comments)
 
 
     @typing. no_type_check
@@ -645,7 +645,7 @@ class Grid:
         """
         v = VTK.from_image_data(self.cells,self.size,self.origin)
         v.add(self.material.flatten(order='F'),'material')
-        v.add_comments(self.comments)
+        v.comments += self.comments
 
         v.save(fname,parallel=False,compress=compress)
 

python/damask/_result.py

@@ -1623,7 +1623,7 @@ class Result:
         else:
             raise ValueError(f'invalid mode {mode}')
 
-        v.set_comments(util.execution_stamp('Result','export_VTK'))
+        v.comments = util.execution_stamp('Result','export_VTK')
 
         N_digits = int(np.floor(np.log10(max(1,int(self.increments[-1][10:])))))+1
 
@@ -1639,7 +1639,7 @@ class Result:
             if self.version_minor >= 13:
                 creator = f.attrs['creator'] if h5py3 else f.attrs['creator'].decode()
                 created = f.attrs['created'] if h5py3 else f.attrs['created'].decode()
-                v.add_comments(f'{creator} ({created})')
+                v.comments += f'{creator} ({created})'
 
             for inc in util.show_progress(self.visible['increments']):
 

python/damask/_vtk.py

@@ -2,7 +2,7 @@ import os
 import warnings
 import multiprocessing as mp
 from pathlib import Path
-from typing import Union, Literal, List
+from typing import Union, Literal, List, Sequence
 
 import numpy as np
 import vtk
@@ -386,7 +386,8 @@ class VTK:
             raise ValueError(f'Array "{label}" not found.')
 
 
-    def get_comments(self) -> List[str]:
+    @property
+    def comments(self) -> List[str]:
         """Return the comments."""
         fielddata = self.vtk_data.GetFieldData()
         for a in range(fielddata.GetNumberOfArrays()):
@@ -395,9 +396,9 @@ class VTK:
                 return [comments.GetValue(i) for i in range(comments.GetNumberOfValues())]
         return []
 
-
-    def set_comments(self,
-                     comments: Union[str, List[str]]):
+    @comments.setter
+    def comments(self,
+                 comments: Union[str, Sequence[str]]):
         """
         Set comments.
 
@@ -407,6 +408,11 @@ class VTK:
             Comments.
 
         """
+        if isinstance(comments,list):
+            i = 0
+            while -i < len(comments) and len(comments[i-1]) == 1: i -= 1        # repack any trailing characters
+            comments = comments[:i] + [''.join(comments[i:])]                   # that resulted from autosplitting of str to list
+
         s = vtk.vtkStringArray()
         s.SetName('comments')
         for c in [comments] if isinstance(comments,str) else comments:
@@ -414,20 +420,6 @@ class VTK:
         self.vtk_data.GetFieldData().AddArray(s)
 
 
-    def add_comments(self,
-                     comments: Union[str, List[str]]):
-        """
-        Add comments.
-
-        Parameters
-        ----------
-        comments : str or list of str
-            Comments to add.
-
-        """
-        self.set_comments(self.get_comments() + ([comments] if isinstance(comments,str) else comments))
-
-
     def __repr__(self) -> str:
         """ASCII representation of the VTK data."""
         writer = vtk.vtkDataSetWriter()

python/tests/test_Result.py

@@ -385,7 +385,7 @@ class TestResult:
         result.export_VTK(output,parallel=False)
         fname = fname.split('.')[0]+f'_inc{(inc if type(inc) == int else inc[0]):0>2}.vti'
         v = VTK.load(tmp_path/fname)
-        v.set_comments('n/a')
+        v.comments = 'n/a'
         v.save(tmp_path/fname,parallel=False)
         with open(fname) as f:
             cur = hashlib.md5(f.read().encode()).hexdigest()

python/tests/test_VTK.py

@@ -162,10 +162,10 @@ class TestVTK:
 
 
     def test_comments(self,tmp_path,default):
-        default.add_comments(['this is a comment'])
+        default.comments += 'this is a comment'
         default.save(tmp_path/'with_comments',parallel=False)
         new = VTK.load(tmp_path/'with_comments.vti')
-        assert new.get_comments() == ['this is a comment']
+        assert new.comments == ['this is a comment']
 
     @pytest.mark.xfail(int(vtk.vtkVersion.GetVTKVersion().split('.')[0])<8, reason='missing METADATA')
     def test_compare_reference_polyData(self,update,ref_path,tmp_path):