Use setuptools-scm for tag-based versioning

.github/workflows/tests.yaml

@@ -15,6 +15,8 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v7.0.0
+      with:
+        fetch-depth: 0
     - uses: astral-sh/setup-uv@v8.2.0
       with:
         python-version: "3.12"

CHANGELOG.md

@@ -14,6 +14,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Store dataset properties as netCDF-safe individual attributes while keeping read compatibility with legacy `attrs["properties"]` dict/JSON data. [\#21](https://github.com/mlwp-tools/mxalign/pull/21) @observingClouds
 - Added CI test workflow with first unit tests. [\#21](https://github.com/mlwp-tools/mxalign/pull/21) @observingClouds
 - Added CI action for package build and upload to pypi.org on releases. [\#28](https://github.com/mlwp-tools/mxalign/pull/28) @leifdenby
+- Package version is now derived from git tags via `setuptools-scm` (build backend switched from hatchling to setuptools) and exposed as `mxalign.__version__`. [\#49](https://github.com/mlwp-tools/mxalign/pull/49) @leifdenby
 
 ## [0.1.0](https://github.com/mlwp-tools/mxalign/releases/tag/v0.1.0)
 

pyproject.toml

@@ -1,6 +1,6 @@
 [project]
 name = "mxalign"
-version = "0.1.0"
+dynamic = ["version"]
 description = "Add your description here"
 readme = "README.md"
 authors = [
@@ -39,8 +39,16 @@ jobqueue = [
 ]
 
 [build-system]
-requires = ["hatchling"]
-build-backend = "hatchling.build"
+requires = ["setuptools>=69", "setuptools-scm>=8", "wheel"]
+build-backend = "setuptools.build_meta"
+
+[tool.setuptools]
+package-dir = {"" = "src"}
+
+[tool.setuptools.packages.find]
+where = ["src"]
+
+[tool.setuptools_scm]
 
 [dependency-groups]
 dev = [

src/mxalign/__init__.py

@@ -1,3 +1,5 @@
+from importlib.metadata import version
+
 from .transformations.transform import transform
 from .transformations.registry import available_transformations, register_transformation
 from .interpolations.interpolate import interpolate
@@ -10,6 +12,7 @@
 from . import interpolations
 
 __all__ = [
+    "__version__",
     "transform",
     "available_transformations",
     "register_transformation",
@@ -22,3 +25,4 @@
     "transformations",
     "interpolations",
 ]
+__version__ = version("mxalign")

tests/test_version.py

@@ -0,0 +1,11 @@
+import mxalign
+
+
+def test_version_is_set() -> None:
+    """Check that the package version is resolved from the git tag.
+
+    A fallback version of ``0.0.0`` means setuptools-scm could not find any
+    git metadata when the package was installed.
+    """
+    assert isinstance(mxalign.__version__, str)
+    assert mxalign.__version__ not in ("", "0.0.0")