configuration: minor improvements / fixes

Could not extend the subclass of 'TypedDict' the way I wanted, so I switched to 'dataclass'.

chatmastermind/storage.py

@@ -1,9 +1,8 @@
 import yaml
-import sys
 import io
 import pathlib
 from .utils import terminal_width, append_message, message_to_chat, ChatType
-from .configuration import Config, config_valid
+from .configuration import Config
 from typing import Any, Optional
 
 
@@ -24,19 +23,6 @@ def read_file(fname: pathlib.Path, tags_only: bool = False) -> dict[str, Any]:
                 "file": fname.name}
 
 
-def read_config(path: str) -> Config:
-    with open(path, 'r') as f:
-        config = yaml.load(f, Loader=yaml.FullLoader)
-    if not config_valid(config):
-        sys.exit(1)
-    return config
-
-
-def write_config(path: str, config: Config) -> None:
-    with open(path, 'w') as f:
-        yaml.dump(config, f)
-
-
 def dump_data(data: dict[str, Any]) -> str:
     with io.StringIO() as fd:
         fd.write(f'TAGS: {" ".join(data["tags"])}\n')
@@ -60,7 +46,7 @@ def save_answers(question: str,
                  ) -> None:
     wtags = otags or tags
     num, inum = 0, 0
-    next_fname = pathlib.Path(str(config['db'])) / '.next'
+    next_fname = pathlib.Path(str(config.db)) / '.next'
     try:
         with open(next_fname, 'r') as f:
             num = int(f.read())
@@ -87,8 +73,8 @@ def create_chat_hist(question: Optional[str],
                      with_file: bool = False
                      ) -> ChatType:
     chat: ChatType = []
-    append_message(chat, 'system', str(config['system']).strip())
-    for file in sorted(pathlib.Path(str(config['db'])).iterdir()):
+    append_message(chat, 'system', str(config.system).strip())
+    for file in sorted(pathlib.Path(str(config.db)).iterdir()):
         if file.suffix == '.yaml':
             with open(file, 'r') as f:
                 data = yaml.load(f, Loader=yaml.FullLoader)
@@ -114,7 +100,7 @@ def create_chat_hist(question: Optional[str],
 
 def get_tags(config: Config, prefix: Optional[str]) -> list[str]:
     result = []
-    for file in sorted(pathlib.Path(str(config['db'])).iterdir()):
+    for file in sorted(pathlib.Path(str(config.db)).iterdir()):
         if file.suffix == '.yaml':
             with open(file, 'r') as f:
                 data = yaml.load(f, Loader=yaml.FullLoader)