refactor: switch to packaging instead of pkg_resources

Closes #139

Author: msiemens

.github/workflows/ci-workflow.yml

@@ -35,6 +35,7 @@ jobs:
         git config --global user.name "Example User"
     - name: Run test suite
       run: |
+        uv run pip install .
         uv run pytest -v --cov=PyGitUp
       shell: bash
     - name: Verify dist package format

PyGitUp/gitup.py

@@ -23,13 +23,15 @@
 
 # 3rd party libs
 try:
-    # noinspection PyUnresolvedReferences
-    import pkg_resources as pkg
+    from importlib import metadata
 except ImportError:  # pragma: no cover
+    metadata = None
     NO_DISTRIBUTE = True
 else:  # pragma: no cover
     NO_DISTRIBUTE = False
 
+from packaging.version import InvalidVersion, Version
+
 import colorama
 from git import Repo, GitCmdObjectDB
 from termcolor import colored
@@ -59,7 +61,7 @@
 
 def get_git_dir():
     toplevel_dir = execute(['git', 'rev-parse', '--show-toplevel'])
-    if ON_WINDOWS and toplevel_dir[0] == '/':
+    if ON_WINDOWS and toplevel_dir and toplevel_dir[0] == '/':
         toplevel_dir = execute(['cygpath', '-m', toplevel_dir])
 
     if toplevel_dir is not None \
@@ -417,9 +419,22 @@ def version_info(self):
         """ Tell, what version we're running at and if it's up to date. """
 
         # Retrive and show local version info
-        package = pkg.get_distribution('git-up')
-        local_version_str = package.version
-        local_version = package.parsed_version
+        try:
+            local_version_str = metadata.version('git-up')
+        except (AttributeError, metadata.PackageNotFoundError):
+            print(
+                colored(
+                    "Please install 'git-up' via pip in order to get version information.",
+                    'yellow',
+                )
+            )
+            return
+
+        try:
+            local_version = Version(local_version_str)
+        except InvalidVersion:
+            print('GitUp version is: ' + colored('v' + local_version_str, 'green'))
+            return
 
         print('GitUp version is: ' + colored('v' + local_version_str, 'green'))
 
@@ -437,7 +452,10 @@ def version_info(self):
         except (HTTPError, URLError, ValueError):
             recent = True  # To not disturb the user with HTTP/parsing errors
         else:
-            recent = local_version >= pkg.parse_version(online_version)
+            try:
+                recent = local_version >= Version(online_version)
+            except InvalidVersion:
+                recent = True
 
         if not recent:
             # noinspection PyUnboundLocalVariable

PyGitUp/tests/test_version.py

@@ -11,7 +11,7 @@
 def test_version():
     """ Run 'git up': Check version """
     try:
-        import pkg_resources as pkg
+        from importlib import metadata
     except ImportError:
         pytest.skip('pip not installed')
 
@@ -25,7 +25,6 @@ def test_version():
         GitUp(sparse=True).version_info()
     stdout = stdout.getvalue()
 
-    package = pkg.get_distribution('git-up')
-    local_version_str = package.version
+    local_version_str = metadata.version('git-up')
 
     assert local_version_str in stdout

pyproject.toml

@@ -25,6 +25,7 @@ classifiers = [
 dependencies = [
     "GitPython~=3.1",
     "colorama~=0.4",
+    "packaging~=25.0",
     "termcolor~=3.2",
 ]