use setuptools_scm for version numbering

.github/workflows/release.yml

@@ -1,6 +1,9 @@
 name: Publish to PyPI and create release on GitHub
 
-on: push
+on:
+  push:
+    tags:
+      - 'v*'
 
 jobs:
   build:
@@ -12,6 +15,8 @@ jobs:
 
     steps:
     - uses: actions/checkout@v7
+      with:
+        fetch-depth: 0  # setuptools_scm needs full history/tags to derive the version
     - name: Install uv
       uses: astral-sh/setup-uv@v3
     - name: Build a binary wheel and a source tarball
@@ -25,7 +30,6 @@ jobs:
   publish-to-pypi:
     name: >-
       Publish Python 🐍 distribution 📦 to PyPI
-    if: startsWith(github.ref, 'refs/tags/')  # only publish to PyPI on tag pushes
     needs:
     - build
     runs-on: ubuntu-latest

.github/workflows/tests.yml

@@ -62,6 +62,8 @@ jobs:
 
     steps:
       - uses: actions/checkout@v7
+        with:
+          fetch-depth: 0  # setuptools_scm needs full history/tags to derive the version
 
       - name: Install uv
         uses: astral-sh/setup-uv@v3

.gitignore

@@ -61,3 +61,6 @@ target/
 
 # ignore generated file that gets manually copied into README
 cli.md
+
+# generated by setuptools_scm
+src/bcdata/_version.py

pyproject.toml

@@ -1,5 +1,5 @@
 [build-system]
-requires = ["setuptools"]
+requires = ["setuptools>=64", "setuptools_scm>=8"]
 build-backend = "setuptools.build_meta"
 
 [project]
@@ -47,8 +47,8 @@ bcdata = "bcdata.cli:cli"
 Homepage = "https://github.com/smnorris/bcdata"
 Issues = "https://github.com/smnorris/bcdata"
 
-[tool.setuptools.dynamic]
-version = {attr = "bcdata.__version__"}
+[tool.setuptools_scm]
+write_to = "src/bcdata/_version.py"
 
 [tool.ruff]
 line-length = 100

src/bcdata/__init__.py

@@ -1,5 +1,6 @@
 import requests
 
+from ._version import __version__ as __version__
 from .bc2pg import bc2pg as bc2pg
 from .bcdc import get_table_definition as get_table_definition
 from .bcdc import get_table_name as get_table_name
@@ -20,5 +21,3 @@
 else:
     raise ConnectionError(f"Failed to download primary key database at {PRIMARY_KEY_DB_URL}")
     primary_keys = {}
-
-__version__ = "0.17.1"