Vendorize Version (#461)

In the future this will be replaced by our own, typed version comparator.

Author: tony

CHANGES

@@ -18,6 +18,14 @@ $ pip install --user --upgrade --pre libtmux
 
 - Remove unused `sphinx-click` development dependency
 
+## libtmux 0.16.1 (2022-12-12)
+
+### Fixes
+
+- Remove reliance on `packaging.version.Version` (#461)
+
+  This is too critical of a package to pin a dependency as it may interfere with other packages the user relies on. In addition, libtmux doesn't need strict compatibility with `packaging`.
+
 ## libtmux 0.16.0 (2022-12-10)
 
 ### Breaking changes

src/libtmux/_compat.py

@@ -37,7 +37,7 @@ def str_from_console(s: t.Union[str, bytes]) -> str:
 import re
 from typing import Iterator, List, Tuple
 
-from packaging.version import Version
+from libtmux._vendor.version import Version
 
 ###
 ### Legacy support for LooseVersion / LegacyVersion, e.g. 2.4-openbsd

src/libtmux/_vendor/__init__.py

@@ -0,0 +1,62 @@
+# via https://github.com/pypa/packaging/blob/22.0/packaging/_structures.py
+# This file is dual licensed under the terms of the Apache License, Version
+# 2.0, and the BSD License. See the LICENSE file in the root of this repository
+# for complete details.
+
+
+class InfinityType:
+    def __repr__(self) -> str:
+        return "Infinity"
+
+    def __hash__(self) -> int:
+        return hash(repr(self))
+
+    def __lt__(self, other: object) -> bool:
+        return False
+
+    def __le__(self, other: object) -> bool:
+        return False
+
+    def __eq__(self, other: object) -> bool:
+        return isinstance(other, self.__class__)
+
+    def __gt__(self, other: object) -> bool:
+        return True
+
+    def __ge__(self, other: object) -> bool:
+        return True
+
+    def __neg__(self: object) -> "NegativeInfinityType":
+        return NegativeInfinity
+
+
+Infinity = InfinityType()
+
+
+class NegativeInfinityType:
+    def __repr__(self) -> str:
+        return "-Infinity"
+
+    def __hash__(self) -> int:
+        return hash(repr(self))
+
+    def __lt__(self, other: object) -> bool:
+        return True
+
+    def __le__(self, other: object) -> bool:
+        return True
+
+    def __eq__(self, other: object) -> bool:
+        return isinstance(other, self.__class__)
+
+    def __gt__(self, other: object) -> bool:
+        return False
+
+    def __ge__(self, other: object) -> bool:
+        return False
+
+    def __neg__(self: object) -> InfinityType:
+        return Infinity
+
+
+NegativeInfinity = NegativeInfinityType()