ci: fix sage CLI invocations for conda-forge's sage (no --preparse/--python flags)

.gitea/workflows/ci.yml

@@ -24,17 +24,31 @@ jobs:
         # parse it, and prepends the `from sage.all import *` that `sage`
         # normally injects at runtime, so Sage's globals (ZZ, var, matrix, ...)
         # resolve instead of looking like undefined names.
+        #
+        # The conda-forge `sage` CLI has no `--preparse` flag (unlike the
+        # classical sage script the image was originally written against), so
+        # this calls the same preparser Sage itself uses, directly in Python.
         run: |
-          set -e
+          python - <<'PYEOF'
-          for f in $(find . -name "*.sage" -not -path "./playground/*"); do
+          import pathlib
-            sage --preparse "$f"
+          from sage.repl.preparse import preparse_file
-            printf 'from sage.all import *  # noqa: F401,F403\n%s\n' "$(cat "${f}.py")" > "${f}.py"
+
-          done
+          for f in pathlib.Path(".").rglob("*.sage"):
+              if f.parts and f.parts[0] == "playground":
+                  continue
+              out = preparse_file(f.read_text())
+              f.with_suffix(f.suffix + ".py").write_text(
+                  "from sage.all import *  # noqa: F401,F403\n" + out
+              )
+          PYEOF
 
       - name: ruff check
         # --no-respect-gitignore: *.sage.py is gitignored (it's generated, see
         # the previous step) but that's exactly what we need to lint here.
-        run: sage --python -m ruff check --no-respect-gitignore .
+        # `python` here is the conda env's own interpreter -- it already has
+        # sage/ruff/pytest importable, `sage --python` isn't a real flag on
+        # the conda-forge sage CLI.
+        run: python -m ruff check --no-respect-gitignore .
 
   test:
     runs-on: ubuntu-latest
@@ -47,4 +61,4 @@ jobs:
         uses: actions/checkout@v4
 
       - name: Run tests
-        run: sage --python -m pytest tests/
+        run: python -m pytest tests/