Fix write solution issues due to `prev_growth` type (fe.Constant).

Simplified the file writing process by commenting out or removing unused sections for cell and boundary labels, and domain parameter handling. Adjusted growth data writing to use `growth_steps` instead of `growth_scheme.prev_growth` for consistency.

src/bvpy/gbvp.py

@@ -121,43 +121,24 @@ class GBVP(BVP):
         if filename is not None:
             with fe.HDF5File(MPI_COMM_WORLD, filename, 'w') as file:
                 file.write(self.domain.mesh, "mesh")
-                file.write(self.domain.cdata, "cell_labels")
-                file.write(self.domain.bdata, "boundary_labels")
+                #file.write(self.domain.cdata, "cell_labels")
+                #file.write(self.domain.bdata, "boundary_labels")
 
                 file.write(self.solution, f'solution_t{self.time.current}')
-                file.write(self.growth_scheme.prev_growth, f'growth_t{self.time.current}')
-
-            def save_dict_to_hdf5(group, dictionary):
-                """
-                save metadata to HDF5 file
-                """
-                for key, value in dictionary.items():
-                    key = str(key)  # Conversion explicite des clés en chaînes
-
-                    if isinstance(value, dict):  # Si la valeur est un dictionnaire, créer un sous-groupe
-                        sub_group = group.create_group(key)
-                        save_dict_to_hdf5(sub_group, value)  # Appel récursif pour les sous-dictionnaires
-                    elif isinstance(value, list):  # Si la valeur est une liste, créer un dataset
-                        group.create_dataset(key, data=value)
-                    elif isinstance(value, str):  # Si la valeur est une chaîne, gérer les chaînes
-                        dt = h5py.string_dtype(encoding='utf-8')
-                        group.create_dataset(key, data=value, dtype=dt)
-                    else:  # Si c'est une valeur simple (int, float, etc.)
-                        group.create_dataset(key, data=value)
-
-            # Add parameters related to the domain
-            if MPI_COMM_WORLD.rank == 0:  # h5py does not support parallal mode, use only the main process
-                with h5py.File(filename, 'a') as file:
-                    # Add various parameters related to the domain
-                    domain_data = {**self.domain._characteristic_size,
-                                   **{'cell_type': self.domain._cell_type,
-                                      'cell_size': self.domain._cell_size,
-                                      'algorithm': self.domain._algorithm,
-                                      'sub_domain_names': self.domain.sub_domain_names,
-                                      'sub_boundary_names': self.domain.sub_boundary_names}}
-
-                    dict_group = file.create_group("domain_parameters")
-                    save_dict_to_hdf5(dict_group, domain_data)
+                file.write(self.growth_steps[self.time.current], f'growth_t{self.time.current}')
+
+            # Add parameters related to the domain : sub_domain / sub_boundary
+            # if MPI_COMM_WORLD.rank == 0:  # h5py does not support parallal mode, use only the main process
+            #     with h5py.File(filename, 'a') as file:
+            #         sub_domain_names = file.create_group("sub_domain_names")
+            #         for label, domain in self.domain.sub_domain_names.items():
+            #             dtype = h5py.string_dtype(encoding="utf-8")
+            #             sub_domain_names.create_dataset(str(label), data=domain, dtype=dtype)
+            #
+            #         sub_boundary_names = file.create_group("sub_boundary_names")
+            #         for label, bound in self.domain.sub_boundary_names.items():
+            #             dtype = h5py.string_dtype(encoding="utf-8")
+            #             sub_boundary_names.create_dataset(str(label), data=bound, dtype=dtype)
 
         logger.setLevel(logging.WARNING)
         self._progressbar.set_range(tmin, tmax)
@@ -172,7 +153,7 @@ class GBVP(BVP):
             if filename is not None:
                 with fe.HDF5File(MPI_COMM_WORLD, filename, 'a') as file:
                     file.write(self.solution, f'solution_t{self.time.current}')
-                    file.write(self.growth_scheme.prev_growth, f'growth_t{self.time.current}')
+                    file.write(self.growth_steps[self.time.current], f'growth_t{self.time.current}')
 
             self._progressbar.update(self.time.current)
             self._progressbar.show()
@@ -230,5 +211,4 @@ class GBVP(BVP):
 
         # - Update time
         self.time.step(self.growth_scheme.dt)
-        self.growth_scheme.update_time(dt)
-        #print(f'growth_scheme, dt={self.growth_scheme.dt}, t={self.growth_scheme.t}')
+        self.growth_scheme.update_time(dt)
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