Cross-platform Tox version mangling

.github/workflows/python-tox.yml

@@ -52,20 +52,13 @@ jobs:
           cache: pip
           cache-dependency-path: |
             requirements-oldest.txt
-      - name: Determine Python version for Tox
-        run: |
-          V=${{ matrix.python }}
-          if [[ "$V" = pypy-2* ]]; then
-            V=pypy
-          elif [[ "$V" = pypy-3* ]]; then
-            V=pypy3
-          elif [[ "$V" = ~* ]]; then
-            V=py$(NORM_V=${V:1:4};echo ${NORM_V//./})
-          else
-            V=py${V//./}
-          fi
-          echo TOX_PYTHON=$V >>$GITHUB_ENV
+      - if: ${{ matrix.os == 'windows-latest' }}
+        name: Determine environment name for Tox (PowerShell)
+        run: python toxver.py >> $env:GITHUB_ENV
+      - if: ${{ matrix.os == 'ubuntu-latest' }}
+        name: Determine environment name for Tox (Bash)
+        run: python toxver.py >> $GITHUB_ENV
       - run: pip install tox
-      - run: tox -e ${{ env.TOX_PYTHON }}-${{ matrix.deps }}
+      - run: tox
       - if: ${{ always() }}
         run: python debug-info.py

toxver.py

@@ -0,0 +1,36 @@
+#!/usr/bin/env python
+from __future__ import absolute_import
+from __future__ import division
+from __future__ import print_function
+from __future__ import unicode_literals
+
+import sys
+
+
+def main(argv):
+    if len(argv) != 3:
+        print("usage: toxver.py [python-version] [deps]", file=sys.stderr)
+        return 1
+
+    deps = argv[2]
+
+    if argv[1].startswith("pypy-2"):
+        print("TOXENV=pypy-" + deps)
+        return 0
+
+    if argv[1].startswith("pypy-3"):
+        print("TOXENV=pypy3-" + deps)
+        return 0
+
+    if argv[1].startswith("~"):
+        ver = argv[1][1:5]
+    else:
+        ver = argv[1]
+
+    ver = ver.replace(".", "")
+    print("TOXENV=py" + ver + "-" + deps)
+    return 0
+
+
+if __name__ == "__main__":
+    sys.exit(main(sys.argv))