spark: add JSON path finder utility

wizard-work/spark/json_path_finder.py

@@ -0,0 +1,47 @@
+#!/usr/bin/env python3
+"""JSON path finder - extracts values at given JSON paths from files."""
+import sys
+import json
+from pathlib import Path
+
+def get_nested_value(data, path):
+    """Get value at dotted path like 'users.0.name'."""
+    keys = path.split('.')
+    result = data
+    for key in keys:
+        if key.isdigit():
+            key = int(key)
+        if isinstance(result, dict):
+            result = result.get(key)
+        elif isinstance(result, list) and isinstance(key, int):
+            result = result[key] if key < len(result) else None
+        else:
+            return None
+        if result is None:
+            return None
+    return result
+
+def main():
+    if len(sys.argv) != 3:
+        print("Usage: json_path_finder.py <json_file> <path>", file=sys.stderr)
+        sys.exit(1)
+    
+    json_file = Path(sys.argv[1])
+    path = sys.argv[2]
+    
+    try:
+        data = json.loads(json_file.read_text())
+        value = get_nested_value(data, path)
+        if value is None:
+            print(f"Path '{path}' not found")
+            sys.exit(1)
+        print(json.dumps(value, indent=2))
+    except json.JSONDecodeError as e:
+        print(f"Invalid JSON: {e}", file=sys.stderr)
+        sys.exit(1)
+    except FileNotFoundError:
+        print(f"File not found: {json_file}", file=sys.stderr)
+        sys.exit(1)
+
+if __name__ == "__main__":
+    main()