replace use of pydantic_settings w/ dataclass

rplugin/python3/mrpy/clickup.py

@@ -1,8 +1,9 @@
+from dataclasses import dataclass, field
 from json import loads
-from typing import Any
+from os import environ
+from typing import Any, Callable
 
 from pydantic import AliasPath, BaseModel, Field, field_validator
-from pydantic_settings import BaseSettings
 
 from urllib.request import Request, urlopen
 
@@ -105,10 +106,15 @@ class ClickupTask(BaseModel):
         return ret
 
 
-class ClickupSession(BaseSettings):
-    auth_key: str = Field(alias="CLICKUP_AUTH", default=...)
-    workspace_id: str = Field(alias="CLICKUP_WORKSPACE_ID", default=...)
-    user_id: str = Field(alias="CLICKUP_USER_ID", default=...)
+def get_env_var(var_name: str) -> Callable[[], str]:
+    return lambda var=var_name: environ[var]
+
+
+@dataclass
+class ClickupSession:
+    auth_key: str = field(default_factory=get_env_var("CLICKUP_AUTH"))
+    workspace_id: str = field(default_factory=get_env_var("CLICKUP_WORKSPACE_ID"))
+    user_id: str = field(default_factory=get_env_var("CLICKUP_USER_ID"))
     base_url: str = "https://api.clickup.com/api/v2"
 
     def _get(self, endpoint: str, **query_params: Any) -> dict[str, Any]: