Add handling for '.' when splitting paths

pathlib.Path(".").parts returns an empty tuple. This is unexpected, and
caused a tuple unpacking statement to fail. The solution is to catch the
ValueError from tuple unpacking and manually construct the return
values.

2 files changed, 13 insertions, 1 deletions

diff --git a/natsort/utils.py b/natsort/utils.py
index c9448b4..8d56b06 100644
--- a/natsort/utils.py
+++ b/natsort/utils.py
@@ -887,7 +887,11 @@ def path_splitter(
         s = PurePath(s)
 
     # Split the path into parts.
-    *path_parts, base = s.parts
+    try:
+        *path_parts, base = s.parts
+    except ValueError:
+        path_parts = []
+        base = str(s)
 
     # Now, split off the file extensions until we reach a decimal number at
     # the beginning of the suffix or there are no more extensions.
diff --git a/tests/test_utils.py b/tests/test_utils.py
index 38df303..bb229b9 100644
--- a/tests/test_utils.py
+++ b/tests/test_utils.py
@@ -141,6 +141,14 @@ def test_path_splitter_splits_path_string_by_sep_example() -> None:
     assert tuple(utils.path_splitter(pathlib.Path(given))) == tuple(expected)
 
 
+@pytest.mark.parametrize("given", [".", "./", "./././", ".\\"])
+def test_path_splitter_handles_dot_properly(given: str) -> None:
+    # https://github.com/SethMMorton/natsort/issues/142
+    expected = (os.path.normpath(given),)
+    assert tuple(utils.path_splitter(given)) == expected
+    assert tuple(utils.path_splitter(pathlib.Path(given))) == expected
+
+
 @given(lists(sampled_from(string.ascii_letters), min_size=2).filter(all))
 def test_path_splitter_splits_path_string_by_sep(x: List[str]) -> None:
     z = str(pathlib.Path(*x))