Reorganize and modernize package

.github/workflows/pythonapp.yml

@@ -1,53 +1,99 @@
-name: tests
+name: CI
 
-on: [push]
+on:
+  push:
+    branches: [master, main]
+  pull_request:
+    branches: [master, main]
 
 jobs:
-  test:
+  get-python-versions:
+    runs-on: ubuntu-latest
+    outputs:
+      python-versions: ${{ steps.get-versions.outputs.python-versions }}
+    steps:
+      - uses: actions/checkout@v4
+      - name: Extract Python versions from pyproject.toml
+        id: get-versions
+        run: |
+          # Extract Python versions from classifiers in pyproject.toml
+          # This looks for lines like "Programming Language :: Python :: 3.8"
+          python_versions=$(grep -o 'Programming Language :: Python :: 3\.[0-9]\+' pyproject.toml | grep -o '3\.[0-9]\+' | sort -V | jq -R -s -c 'split("\n")[:-1]')
+          echo "python-versions=$python_versions" >> $GITHUB_OUTPUT
+          echo "Detected Python versions: $python_versions"
 
+  lint:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - name: Set up Python
+        uses: actions/setup-python@v4
+        with:
+          python-version: '3.12'
+      - name: Install dependencies
+        run: |
+          python -m pip install --upgrade pip
+          pip install -e .[dev]
+      - name: Lint with flake8
+        run: |
+          # stop the build if there are Python syntax errors or undefined names
+          flake8 src/ tests/ --count --select=E9,F63,F7,F82 --show-source --statistics
+          # run full linting
+          flake8 src/ tests/
+
+  test:
+    needs: [get-python-versions, lint]
     runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        python-version: ${{ fromJson(needs.get-python-versions.outputs.python-versions) }}
 
     steps:
-    - uses: actions/checkout@v2
-    - name: Set up Python
-      uses: actions/setup-python@v2
-      with:
-        python-version: 3.x
-    - name: Install dependencies
-      run: |
-        python -m pip install --upgrade pip
-        pip install .
-    - name: Lint with flake8
-      run: |
-        pip install flake8
-        # stop the build if there are Python syntax errors or undefined names
-        flake8 . --count --select=E9,F63,F7,F82 --show-source --statistics
-        # exit-zero treats all errors as warnings. The GitHub editor is 127 chars wide
-        flake8 . --count --exit-zero --max-complexity=10 --max-line-length=127 --statistics
-    - name: Test with pytest    
-      run: |
-        pip install -r requirements.txt
-        pytest
-    - name: Install dependencies
-      run: |
-        python -m pip install --upgrade pip
-        pip install build
-  publish:
-    if: github.event_name == 'push' && startsWith(github.event.ref, 'refs/tags')
-    needs: test
+      - uses: actions/checkout@v4
+      - name: Set up Python ${{ matrix.python-version }}
+        uses: actions/setup-python@v4
+        with:
+          python-version: ${{ matrix.python-version }}
+      - name: Install dependencies
+        run: |
+          python -m pip install --upgrade pip
+          pip install -e .[test]
+      - name: Test with pytest
+        run: pytest
 
+  build:
+    needs: [test]
     runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - name: Set up Python
+        uses: actions/setup-python@v4
+        with:
+          python-version: '3.12'
+      - name: Install build dependencies
+        run: |
+          python -m pip install --upgrade pip
+          pip install build
+      - name: Build package
+        run: python -m build
+      - name: Upload build artifacts
+        uses: actions/upload-artifact@v3
+        with:
+          name: dist
+          path: dist/
 
+  publish:
+    if: github.event_name == 'push' && startsWith(github.event.ref, 'refs/tags')
+    needs: [build]
+    runs-on: ubuntu-latest
+    permissions:
+      id-token: write
     steps:
-    - uses: actions/checkout@v2
-    - name: Set up Python
-      uses: actions/setup-python@v2
-      with:
-        python-version: '3.x'    
-    - name: Build package for publishing
-      run: python -m build
-    - name: Publish package
-      uses: pypa/gh-action-pypi-publish@27b31702a0e7fc50959f5ad993c78deac1bdfc29
-      with:
-        user: __token__
-        password: ${{ secrets.PYPI_API_TOKEN }}
+      - name: Download build artifacts
+        uses: actions/download-artifact@v3
+        with:
+          name: dist
+          path: dist/
+      - name: Publish package to PyPI
+        uses: pypa/gh-action-pypi-publish@release/v1