Fix Path.get_relative

src/ktools/pathlib.py

@@ -3,7 +3,7 @@ from __future__ import annotations
 from logging import getLogger
 from os import chown
 from os import name as os_name
-from os import umask
+from os import pardir, umask
 from pathlib import Path as PathBase
 from pathlib import PosixPath as PosixPathBase
 from pathlib import WindowsPath as WindowsPathBase
@@ -90,13 +90,14 @@ class Path(PathBase):
         """
         if not self.is_absolute() or not to.is_absolute():
             raise ValueError(f'{self!r} or {to!r} is not absolute.')
-        items_from = self.parts
-        items_to = to.parts
+        parts_from = self.parts
+        parts_to = to.parts
         # Remove identical path prefix parts
-        while items_from[0] == items_to[0]:
-            items_from = items_from[1:]
-            items_to = items_to[1:]
-        return Path(*('..' for x in range(1, len(items_from))), *items_to)
+        while parts_from and parts_to and parts_from[0] == parts_to[0]:
+            parts_from = parts_from[1:]
+            parts_to = parts_to[1:]
+        parents = len(parts_from) - 1
+        return Path(*(pardir,) * parents, *parts_to)
 
     def remove_up_to(self, parent: Path):
         'Remove the paths in `self` until the passed `parent`.'