Add basic recipe checks

.github/workflows/check-recipes.yml

@@ -0,0 +1,27 @@
+# This workflow will check that each recipe has an "Instructions" and
+# "Ingredients" Markdown section (line starting with `#`).
+name: Basic recipe checks
+
+on:
+  push:
+    branches: [ "main" ]
+  pull_request:
+    branches: [ "main" ]
+
+permissions:
+  contents: read
+
+jobs:
+  check:
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v4
+    - name: Set up Python
+      uses: actions/setup-python@v5
+      with:
+        python-version: "3.x"
+    - name: Test with pytest
+      run: |
+        python check_recipes.py

check_recipes.py

@@ -0,0 +1,22 @@
+import glob
+from pathlib import Path
+import re
+import sys
+
+ingredients_re = re.compile('^#.*ingredients',  re.IGNORECASE|re.MULTILINE)
+instructions_re = re.compile('^#.*instructions',  re.IGNORECASE|re.MULTILINE)
+
+base = Path('.')
+print(f"Checking recipes in {str(base.absolute())}:")
+
+errors = 0
+for path in base.glob('*/*.md'):
+    if not ingredients_re.search(path.read_text()):
+        print(f'::error file={str(path)},title=Ingredients missing::File is missing an ingredients section: "# Ingredients"')
+        errors += 1
+    if not instructions_re.search(path.read_text()):
+        print(f'::error file={str(path)},title=Instructions missing::File is missing an instructions section: "# Instructions"')
+        errors += 1
+print(f"{errors} errors")
+if errors:
+    sys.exit(1)