!squash more validator

Author: tony

src/vcspull/validator.py

@@ -1,3 +1,4 @@
+import pathlib
 import typing as t
 
 from vcspull.types import RawConfigDict
@@ -7,4 +8,25 @@
 
 
 def is_valid_config(config: t.Dict[str, t.Any]) -> "TypeGuard[RawConfigDict]":
+    if not isinstance(config, dict):
+        return False
+
+    for k, v in config.items():
+        if k is None or v is None:
+            return False
+
+        if not isinstance(k, str) and not isinstance(k, pathlib.Path):
+            return False
+
+        if not isinstance(v, dict):
+            return False
+
+        for repo_name, repo in v.items():
+            if not isinstance(repo, (str, dict, pathlib.Path)):
+                return False
+
+            if isinstance(repo, dict):
+                if "url" not in repo and "repo" not in repo:
+                    return False
+
     return True