[Optionable] Support for [] as default for list(dict)

kibot/misc.py

@@ -554,7 +554,7 @@ def force_list(v):
     return v if v is None or isinstance(v, list) else [v]
 
 
-def typeof(v, cls):
+def typeof(v, cls, valid=None):
     if isinstance(v, bool):
         return 'boolean'
     if isinstance(v, (int, float)):
@@ -565,6 +565,8 @@ def typeof(v, cls):
         return 'dict'
     if isinstance(v, list):
         if len(v) == 0:
+            if valid is not None:
+                return next(filter(lambda x: x.startswith('list('), valid), 'list(string)')
             return 'list(string)'
         return 'list({})'.format(typeof(v[0], cls))
     return 'None'

kibot/optionable.py

@@ -234,7 +234,7 @@ def _perform_config_mapping(self):
                 v.set_default(def_val)
             cur_val = getattr(self, alias)
             # Get the type used by the user as a string
-            v_type = typeof(v, Optionable)
+            v_type = typeof(v, Optionable, valid)
             if v_type not in valid and not self.check_string_dict(v_type, valid, k, v):
                 # Not a valid type for this key
                 if v_type == 'None':