ci: cleanup

.github/scripts/extract-json.py

@@ -0,0 +1,38 @@
+#!/usr/bin/env python3
+"""Copy the first JSON object in a model answer to a file.
+
+    python3 .github/scripts/extract-json.py ANSWER_FILE OUTPUT_FILE
+
+Copilot answers in text. Even when told to return only JSON, a model can wrap
+it in a markdown fence or put a sentence before it. This skips anything around
+the first object that parses. Exits 0 when it wrote one, 1 when there is none.
+"""
+
+import json
+import sys
+
+
+def main() -> int:
+    if len(sys.argv) != 3:
+        print(__doc__, file=sys.stderr)
+        return 2
+    with open(sys.argv[1], encoding="utf-8", errors="replace") as fh:
+        text = fh.read()
+    decoder = json.JSONDecoder()
+    start = text.find("{")
+    while start != -1:
+        try:
+            value, _ = decoder.raw_decode(text, start)
+        except ValueError:
+            start = text.find("{", start + 1)
+            continue
+        if isinstance(value, dict):
+            with open(sys.argv[2], "w", encoding="utf-8") as fh:
+                json.dump(value, fh, ensure_ascii=False)
+            return 0
+        start = text.find("{", start + 1)
+    return 1
+
+
+if __name__ == "__main__":
+    sys.exit(main())