move MSYS2 to GHA

.appveyor.yml

@@ -17,11 +17,6 @@ environment:
   - PYTHON: C:/Python38-x64
   - PYTHON: C:/Python35
   - PYTHON: C:/Python35-x64
-  - PYTHON: C:/msys64/mingw32
-    EXECUTABLE: bin/python3
-    PIP_DIR: bin
-    TEST_OPTIONS: --processes=0
-    DEPLOY: NO
   - PYTHON: C:/vp/pypy3
     EXECUTABLE: bin/pypy.exe
     VENV: YES
@@ -41,33 +36,17 @@ install:
         c:\pillow\winbuild\appveyor_install_pypy3.cmd
       }
 - ps: |
-      if ($env:PYTHON -eq "c:/msys64/mingw32")
-      {
-        c:\msys64\usr\bin\bash -l -c c:\\pillow\\winbuild\\appveyor_install_msys2_deps.sh
-      }
-      else
-      {
         c:\python37\python.exe c:\pillow\winbuild\build_dep.py
         c:\pillow\winbuild\build_deps.cmd
         $host.SetShouldExit(0)
-      }
 - curl -fsSL -o gs952.exe https://github.com/ArtifexSoftware/ghostpdl-downloads/releases/download/gs952/gs952w32.exe
 - gs952.exe /S
 - path %path%;C:\Program Files (x86)\gs\gs9.52\bin
 
 build_script:
 - ps: |
-      if ($env:PYTHON -eq "c:/msys64/mingw32")
-      {
-        c:\msys64\usr\bin\bash -l -c c:\\pillow\\winbuild\\appveyor_build_msys2.sh
-        Write-Host "through install"
-        $host.SetShouldExit(0)
-      }
-      else
-      {
         & $env:PYTHON/$env:EXECUTABLE c:\pillow\winbuild\build.py
         $host.SetShouldExit(0)
-      }
 - cd c:\pillow
 - '%PYTHON%\%EXECUTABLE% selftest.py --installed'
 

.github/workflows/test-windows.yml

@@ -385,3 +385,55 @@ jobs:
       with:
         name: ${{ steps.wheel.outputs.dist }}
         path: dist
+
+  msys:
+    runs-on: windows-2019
+
+    strategy:
+      fail-fast: false
+      matrix:
+        mingw: ["MINGW32", "MINGW64"]
+        include:
+          - mingw: "MINGW32"
+            package: "mingw-w64-i686"
+          - mingw: "MINGW64"
+            package: "mingw-w64-x86_64"
+
+    defaults:
+      run:
+        shell: bash.exe --login "{0}"
+    env:
+      MSYSTEM: ${{ matrix.mingw }}
+      CHERE_INVOKING: 1
+
+    timeout-minutes: 30
+    name: MSYS2 ${{ matrix.mingw }}
+
+    steps:
+      - uses: actions/checkout@v2
+
+      - name: Set up MSYS
+        run: echo ::add-path::C:\msys64\usr\bin\
+        shell: pwsh
+
+      - name: Install MinGW packages
+        run: |
+          pacman -S --noconfirm \
+              ${{ matrix.package }}-python3-pip \
+              ${{ matrix.package }}-python3-setuptools \
+              ${{ matrix.package }}-python3-pytest \
+              ${{ matrix.package }}-python3-pytest-cov \
+              ${{ matrix.package }}-python3-olefile \
+              ${{ matrix.package }}-libjpeg-turbo \
+              ${{ matrix.package }}-libimagequant
+          python3 -m pip install -U pip codecov
+
+      - name: Build Pillow
+        run: |
+          python3 setup.py install
+
+      - name: Test Pillow
+        run: |
+          python3 selftest.py --installed
+          python3 -m pytest -vx --cov PIL --cov Tests --cov-report term --cov-report xml Tests
+          codecov --file coverage.xml --name MSYS2 ${{ matrix.mingw }}