add tracking

.gitignore

@@ -1,3 +1,5 @@
+*.DS_Store
+
 # ---> Python
 # Byte-compiled / optimized / DLL files
 *__pycache__/

helper.py

@@ -44,7 +44,7 @@ This 'helper.py' is written to work at the **root directory of the dataset**.
 4. from a Python session, run `import helper`.
 """
 
-DATE_PATTERN = _re.compile(r'[0-9]{4}-[0-9]{2}-[0-9]{2}$')
+DATE_PATTERN = _re.compile(r'([0-9]{4}-[0-9]{2}-[0-9]{2})-$')
 
 rootdir = _Path(__file__).parent
 
@@ -159,7 +159,7 @@ class context:
                     is_session = DATE_PATTERN.search(child.name)
                     if not is_session:
                         continue
-                    date = is_session.group(0)
+                    date = is_session.group(1)
                     if self.__validate__('date', date):
                         cxt         = sub.context.copy()
                         cxt['date'] = date