[MAINT] Move bids version constant definition to bids module (#1153)

* move bids version definition

* update unit tests

clinica/iotools/bids_dataset_description.py

@@ -5,7 +5,7 @@
 from cattr.gen import make_dict_unstructure_fn, override
 from cattr.preconf.json import make_converter
 
-BIDS_VERSION = "1.7.0"
+from clinica.utils.bids import BIDS_VERSION
 
 
 @define

clinica/utils/bids.py

@@ -4,6 +4,16 @@
 from pathlib import Path
 from typing import Dict, Tuple, Union
 
+__all__ = [
+    "BIDSLabel",
+    "BIDSFileName",
+    "BIDS_VERSION",
+    "Extension",
+    "Suffix",
+]
+
+BIDS_VERSION = "1.7.0"
+
 
 class Extension(str, Enum):
     """Possible extensions in BIDS file names."""
@@ -114,7 +124,7 @@ def name(self) -> str:
 
     @classmethod
     def from_name(cls, filename: Union[str, PathLike]):
-        filename, extension = split_name_from_extension(filename)
+        filename, extension = _split_name_from_extension(filename)
         entities, suffix = _tokenize_filename_no_ext(filename)
         subject = entities.pop("sub")
         session = entities.pop("ses")
@@ -164,7 +174,7 @@ def _tokenize_filename_no_ext(
     return entities, suffix
 
 
-def split_name_from_extension(filename: Union[str, PathLike]) -> Tuple[str, str]:
+def _split_name_from_extension(filename: Union[str, PathLike]) -> Tuple[str, str]:
     extension = ""
     filename = Path(filename)
     while "." in filename.name:

test/unittests/iotools/test_bids_utils.py

@@ -106,7 +106,7 @@ def expected_description_content(
 ) -> str:
     import json
 
-    from clinica.iotools.bids_dataset_description import BIDS_VERSION
+    from clinica.utils.bids import BIDS_VERSION
 
     expected_version = BIDS_VERSION if bids_version is None else bids_version
     desc_dict = {