feat(config): Config loading and merging

config/merger.py

@@ -1,3 +1,4 @@
+from typing import cast
 from config.dtype import ArchMgrConfig
 
 
@@ -5,5 +6,30 @@ def merge_configs(config: ArchMgrConfig, new_config: ArchMgrConfig) -> ArchMgrCo
     if len(new_config) == 0 or len(config) == 0:
         return config
 
-    # Merge configs
-    return config
+    def combine(a: dict, b: dict):
+        combined = {}
+        for key in b:
+            val = b[key]
+            try:
+                a[key]
+                if isinstance(val, dict):
+                    combined[key] = combine(val, a[key])
+                elif isinstance(val, list):
+                    combined[key] = val
+                    for v in a[key]:
+                        combined[key].append(v)
+                else:
+                    combined[key] = val
+            except KeyError:
+                combined[key] = val
+
+        for key in a:
+            try:
+                b[key]
+            except KeyError:
+                combined[key] = a[key]
+
+        return combined
+
+    # Merge configs (using nasty casts)
+    return cast(ArchMgrConfig, combine(cast(dict, config), cast(dict, new_config)))