Add executable generation

.github/workflows/exe.yml

@@ -0,0 +1,47 @@
+name: WeasyPrint’s exe generation
+on: [push]
+
+jobs:
+  generate:
+    name: ${{ matrix.os }}
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: ['ubuntu-20.04', 'macos-11', 'windows-2019']
+    steps:
+      - uses: actions/checkout@v3
+      - uses: actions/setup-python@v4
+        with:
+          python-version: '3.11'
+      - name: Use absolute imports
+        if: matrix.os == 'ubuntu-20.04'
+        run: |
+          sed -i 's/^from \. /from weasyprint /' weasyprint/__main__.py
+          sed -i 's/^from \./from weasyprint\./' weasyprint/__main__.py
+      - name: Use absolute imports and install Pango (MacOS)
+        if: matrix.os == 'macos-11'
+        run: |
+          sed -i '' 's/^from \. /from weasyprint /' weasyprint/__main__.py
+          sed -i '' 's/^from \./from weasyprint\./' weasyprint/__main__.py
+          rm /usr/local/bin/2to3
+          brew install pango
+      - name: Use absolute imports and install Pango (Windows)
+        if: matrix.os == 'windows-2019'
+        run: |
+          (Get-Content weasyprint/__main__.py).replace('^from \. ', 'from weasyprint ').replace('^from \.', 'from weasyprint\.') | Set-Content weasyprint/__main__.py
+          C:\msys64\usr\bin\bash -lc 'pacman -S mingw-w64-x86_64-pango --noconfirm'
+          rm C:\msys64\mingw64\bin\python.exe
+      - name: Install requirements
+        run: python -m pip install . pyinstaller
+      - name: Generate executable
+        run: python -m PyInstaller weasyprint/__main__.py -n weasyprint -F
+      - name: Test executable
+        run: dist/weasyprint --help
+      - name: Store executable
+        uses: actions/upload-artifact@v3
+        with:
+          name: weasyprint
+          path: |
+            dist/weasyprint
+            README.rst
+            LICENSE