CI: Drop direct setup.py calls, use pipx where convenient

Author: effigies

.github/workflows/pythonpackage.yml

@@ -26,19 +26,20 @@ jobs:
     - uses: actions/checkout@v3
       with:
         fetch-depth: 0
-    - name: Build in confined, updated environment and interpolate version
+    - name: Build package
       run: |
-        python -m venv /tmp/buildenv
-        source /tmp/buildenv/bin/activate
-        python -m pip install -U setuptools pip wheel twine docutils
-        python setup.py sdist bdist_wheel
-        python -m twine check dist/nitransforms*
+        pipx run build
+    - name: Determine expected version
+      run: |
+        python -m venv /tmp/getversion
+        source /tmp/getversion/bin/activate
+        python -m pip install setuptools_scm
 
         # Interpolate version
         if [[ "$GITHUB_REF" == refs/tags/* ]]; then
           TAG=${GITHUB_REF##*/}
         fi
-        THISVERSION=$( python setup.py --version )
+        THISVERSION=$( python -m setuptools_scm )
         THISVERSION=${TAG:-$THISVERSION}
         echo "Expected VERSION: \"${THISVERSION}\""
         echo "THISVERSION=${THISVERSION}" >> ${GITHUB_ENV}
@@ -47,7 +48,7 @@ jobs:
       run: |
         python -m venv /tmp/install_sdist
         source /tmp/install_sdist/bin/activate
-        python -m pip install --upgrade pip wheel
+        python -m pip install --upgrade pip
         python -m pip install dist/nitransforms*.tar.gz
         INSTALLED_VERSION=$(python -c 'import nitransforms; print(nitransforms.__version__, end="")')
         echo "VERSION: \"${THISVERSION}\""
@@ -58,7 +59,7 @@ jobs:
       run: |
         python -m venv /tmp/install_wheel
         source /tmp/install_wheel/bin/activate
-        python -m pip install --upgrade pip wheel
+        python -m pip install --upgrade pip
         python -m pip install dist/nitransforms*.whl
         INSTALLED_VERSION=$(python -c 'import nitransforms; print(nitransforms.__version__, end="")')
         echo "INSTALLED: \"${INSTALLED_VERSION}\""
@@ -94,5 +95,4 @@ jobs:
       uses: actions/setup-python@v4
       with:
         python-version: 3.7
-    - run: pip install flake8
-    - run: flake8 nitransforms/
+    - run: pipx run flake8 nitransforms