using python for some conditional stuff instead of bash

.forgejo/workflows/autotagger.yaml

@@ -27,18 +27,14 @@ jobs:
         id: check_commit_message
         run: |
           COMMIT_MESSAGE=$(echo "${{ steps.extract_commit_message.outputs.message }}")
-          PATTERN="^(?:V|v)ersion\ bump(?:ed)?\ to\ ([0-9]+\.[0-9]+\.[0-9]+(?:-[a-zA-Z0-9]+)?).*"
-          if echo "$COMMIT_MESSAGE" | grep -E "$PATTERN"; then
-            echo "Found version bump in commit message."
-            echo "::set-output name=version::${BASH_REMATCH[1]}"
+          OUTPUT=$(python .forgejo/scripts/message.py "$COMMIT_MESSAGE")
+          if [ $OUTPUT == "Usage: python message.py <commit_message>"]; then
+            echo "Called without commit message!"
+            exit 1
+          else if [ $OUTPUT == "None"]; then
+            echo "::set-output name=latest_tag::$(git describe --tags --abbrev=0)"
           else
-            echo "No version bump found in commit message."
-            LATEST_TAG=$(git describe --tags --abbrev=0 2>/dev/null || echo "")
-            if [ -n "$LATEST_TAG" ]; then
-              echo "::set-output name=latest_tag::$LATEST_TAG"
-            else
-              echo "No tags found."
-            fi
+            echo "::set-output name=version::$OUTPUT"
           fi
 
       - name: Create tag

.forgejo/workflows/scripts/message.py

@@ -0,0 +1,20 @@
+import re
+import sys
+from typing import Optional
+
+pattern = r"^(?:V|v)ersion\ bump(?:ed)?\ to\ ([0-9]+\.[0-9]+\.[0-9]+(?:-[a-zA-Z0-9]+)?).*"
+
+def get_commit_message(string) -> Optional[str]:
+    m = re.match(pattern, string)
+    if m:
+        return m.group(1)
+    else:
+        return None
+
+if __name__ == "__main__":
+    if len(sys.argv) >= 2:
+        commit_message = sys.argv[1]
+        result = get_commit_message(commit_message)
+        print(result)
+    else:
+        print("Usage: python message.py <commit_message>")