add util method to merge dictionaries recursively with priority

scripts/utils.py

@@ -1,4 +1,6 @@
 from datetime import datetime
+from typing import Dict
+import warnings
 
 from config import MAX_LEN
 
@@ -21,3 +23,17 @@ def generate_short_title(title):
 
 def get_week(d=datetime.today()):
     return (int(d.strftime("%W")) + 52 - 5) % 52
+
+
+def merge_dictionaries(main: Dict, fallback: Dict):
+    merged = main
+    for key in fallback.keys():
+        if key not in main.keys():
+            merged[key] = fallback[key]
+        elif type(fallback[key]) == dict:
+            if not type(merged[key]) == dict:
+                warnings.warn(
+                    f"Main dictionary has invalid format. Replacing entry with key {key} with fallback value.")
+                merged[key] = fallback[key]
+            merged[key] = merge_dictionaries(merged[key], fallback[key])
+    return merged