Simplify CI Version Script

.github/workflows/release-build.yml

@@ -49,25 +49,18 @@ jobs:
         uses: pdm-project/setup-pdm@v4
         with:
           python-version: "3.14"
+          cache: true
+
+      - name: Install dependencies
+        if: github.event_name == 'workflow_run'
+        run: pdm install
 
       - name: Get version
         id: version
         run: |
           if [ "${{ github.event_name }}" == "workflow_run" ]; then
-            # PDM SCM is the single source of truth for version numbers.
-            # It reads git tags and produces a PEP 440 version string.
-            pep440_version=$(pdm show --version)
-
-            # Convert PEP 440 → SemVer for Velopack (e.g. 0.1.0.dev47 → 0.1.0-dev.47)
-            installer_version=$(python3 -c "
-          from packaging.version import Version
-          v = Version('${pep440_version}')
-          base = f'{v.major}.{v.minor}.{v.micro}'
-          print(f'{base}-dev.{v.dev}' if v.dev is not None else base)
-          ")
-
-            echo "version=${pep440_version}" >> $GITHUB_OUTPUT
-            echo "installer-version=${installer_version}" >> $GITHUB_OUTPUT
+            # pdm run version outputs version=<pep440> and installer-version=<semver>
+            pdm run version >> $GITHUB_OUTPUT
             echo "channel=dev" >> $GITHUB_OUTPUT
             echo "tag=dev" >> $GITHUB_OUTPUT
             echo "is-dev=true" >> $GITHUB_OUTPUT

pyproject.toml

@@ -87,6 +87,7 @@ dev = { call = "tool.scripts.dev:main" }
 format = "ruff format"
 lint = { composite = ["analyze", "format", "type-check"] }
 package = { call = "tool.scripts.package:main" }
+version = { call = "tool.scripts.version:main" }
 post_install = { call = "tool.scripts.setup_dev:main" }
 test = "pytest --cov=synodic_client --verbose tests"
 type-check = "pyrefly check"

tool/scripts/version.py

@@ -0,0 +1,23 @@
+"""Print project version in PEP 440 and SemVer formats.
+
+Outputs ``version=<pep440>`` and ``installer-version=<semver>`` lines,
+one per line.  In CI these can be appended directly to ``$GITHUB_OUTPUT``.
+
+Usage examples:
+    pdm run version
+    pdm run python -m tool.scripts.version
+"""
+
+from synodic_client import __version__
+from synodic_client.updater import pep440_to_semver
+
+
+def main() -> None:
+    """Entry point for the version script."""
+    semver = pep440_to_semver(__version__)
+    print(f'version={__version__}')
+    print(f'installer-version={semver}')
+
+
+if __name__ == '__main__':
+    main()