Bug fix for method .relative_to of etils.epath.Path

PiperOrigin-RevId: 738320692

Author: ClementSicard

etils/epath/gpath.py

@@ -258,6 +258,11 @@ def open(  # pytype: disable=signature-mismatch  # overriding-parameter-count-ch
     gfile = typing.cast(typing.IO[Union[str, bytes]], gfile)
     return gfile
 
+  def relative_to(self: _P, other: PathLike) -> _P:
+    """Returns the current path relative to `other`."""
+    other_path = self._new(other)
+    return super().relative_to(other_path)
+
   def rename(self: _P, target: PathLike) -> _P:
     """Rename file or directory to the given target."""
     # Note: Issue if WindowsPath and target is gs://. Rather than using `_new`,

etils/epath/gpath_test.py

@@ -455,3 +455,11 @@ def test_public_access():
   # Test a public bucket
   p = epath.Path('gs://tfds-data/datasets')
   assert p.exists()
+
+
+def test_relative_to():
+  path = epath.Path('gs://bucket/dir/subdir')
+  assert path.relative_to(path) == epath.Path('.')
+  assert path.relative_to('gs://bucket/dir') == epath.Path('subdir')
+  with pytest.raises(ValueError, match='not in the subpath'):
+    path.relative_to('gs://bucket/other-dir')