configuration: minor improvements / fixes

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

chatmastermind/main.py

@@ -8,7 +8,7 @@ import argcomplete
 import argparse
 import pathlib
 from .utils import terminal_width, print_tag_args, print_chat_hist, display_source_code, print_tags_frequency, ChatType
-from .storage import save_answers, create_chat_hist, get_tags, get_tags_unique, read_file, read_config, write_config, dump_data
+from .storage import save_answers, create_chat_hist, get_tags, get_tags_unique, read_file, dump_data
 from .api_client import ai, openai_api_key, print_models
 from .configuration import Config
 from itertools import zip_longest
@@ -72,10 +72,10 @@ def config_cmd(args: argparse.Namespace, config: Config) -> None:
     if args.list_models:
         print_models()
     elif args.print_model:
-        print(config['openai']['model'])
+        print(config.openai.model)
     elif args.model:
-        config['openai']['model'] = args.model
-        write_config(args.config, config)
+        config.openai.model = args.model
+        config.to_file(args.config)
 
 
 def ask_cmd(args: argparse.Namespace, config: Config) -> None:
@@ -83,11 +83,11 @@ def ask_cmd(args: argparse.Namespace, config: Config) -> None:
     Handler for the 'ask' command.
     """
     if args.max_tokens:
-        config['openai']['max_tokens'] = args.max_tokens
+        config.openai.max_tokens = args.max_tokens
     if args.temperature:
-        config['openai']['temperature'] = args.temperature
+        config.openai.temperature = args.temperature
     if args.model:
-        config['openai']['model'] = args.model
+        config.openai.model = args.model
     chat, question, tags = create_question_with_hist(args, config)
     print_chat_hist(chat, False, args.only_source_code)
     otags = args.output_tags or []
@@ -225,9 +225,9 @@ def main() -> int:
     parser = create_parser()
     args = parser.parse_args()
     command = parser.parse_args()
-    config = read_config(args.config)
+    config = Config.from_file(args.config)
 
-    openai_api_key(config['openai']['api_key'])
+    openai_api_key(config.openai.api_key)
 
     command.func(command, config)