use git tag to get version

Author: smacke

.gitignore

@@ -22,4 +22,3 @@ nbsafety/resources/nbextension/index.js.map
 coverage.xml
 htmlcov/**
 .hypothesis
-.version

pyproject.toml

@@ -2,9 +2,13 @@
 requires = [
     "setuptools >= 48",
     "wheel >= 0.30.0",
+    "setuptools-git-versioning",
 ]
 build-backend = 'setuptools.build_meta'
 
+[tool.setuptools-git-versioning]
+enabled = true
+
 [tool.black]
 line-length = 88
 target-version = ['py39']

scripts/bump-version.py

@@ -12,12 +12,10 @@ def main(*_):
     components[-1] += 1
     version = ".".join(str(c) for c in components)
     subprocess.check_output(["git", "tag", version])
-    with open(".version", "w") as f:
-        f.write(version)
     return 0
 
 
 if __name__ == "__main__":
-    parser = argparse.ArgumentParser(description="Bump version, create git tag, and write file.")
+    parser = argparse.ArgumentParser(description="Bump version and create git tag.")
     args = parser.parse_args()
     sys.exit(main(args))

setup.cfg

@@ -12,7 +12,6 @@ parentdir_prefix = pyccolo-
 
 [metadata]
 name = pyccolo
-version = file: .version
 history = file: docs/HISTORY.rst
 description = Declarative instrumentation for Python
 long_description = file: README.md