start vendoring versioneer again, non-vendored led to issues

.github/CONTRIBUTING.md

@@ -133,7 +133,6 @@ The same is true for the following lines in `./pyprep/__init__.py`:
 from ._version import get_versions
 
 __version__ = get_versions()["version"]
-del get_versions
 ```
 
 To update the `versioneer` software, follow the instructions on their documentation page.

.pre-commit-config.yaml

@@ -20,7 +20,11 @@ repos:
     rev: "23.10.1"
     hooks:
     -   id: black
-        exclude: pyprep/_version.py
+        exclude: |
+            (?x)^(
+                pyprep/_version.py|
+                versioneer.py
+            )$
 -   repo: https://github.com/pycqa/flake8
     rev: "6.1.0"
     hooks:

MANIFEST.in

@@ -4,6 +4,7 @@ include LICENSE
 include requirements-dev.txt
 include pyprep/_version.py
 include CITATION.cff
+include versioneer.py
 
 graft docs
 graft examples

pyproject.toml

@@ -4,10 +4,7 @@ extend-exclude = '''
 # in the root of the project.
 (
   matprep_artifacts
+  versioneer.py
   pyprep/_version.py
 )
 '''
-
-[build-system]
-requires = ["setuptools", "versioneer[toml]"]
-build-backend = "setuptools.build_meta"

setup.cfg

@@ -74,6 +74,7 @@ skip_glob =
   examples/*
   matprep_artifacts/*
   pyprep/_version.py
+  versioneer.py
 
 [coverage:run]
 omit =

setup.py

@@ -2,9 +2,10 @@
 
 import sys
 
-import versioneer
 from setuptools import setup
 
+import versioneer
+
 # Give setuptools a hint to complain if it's too old a version
 # 30.3.0 allows us to put most metadata in setup.cfg
 # 38.3.0 contains most setup.cfg bugfixes