Fix TheR1D#422: Markdown formatting for chat history

sgpt/handlers/chat_handler.py

@@ -1,6 +1,8 @@
 import json
 from pathlib import Path
 from typing import Any, Callable, Dict, Generator, List, Optional
+from rich.console import Console
+from rich.markdown import Markdown
 
 import typer
 from click import BadArgumentUsage
@@ -125,10 +127,11 @@ def list_ids(cls, value: str) -> None:
 
     @classmethod
     def show_messages(cls, chat_id: str) -> None:
-        # Prints all messages from a specified chat ID to the console.
-        for index, message in enumerate(cls.chat_session.get_messages(chat_id)):
-            color = "magenta" if index % 2 == 0 else "green"
-            typer.secho(message, fg=color)
+        # Concatenate messages from a specified chat ID and render markdown
+        history = "\n\n".join(cls.chat_session.get_messages(chat_id))
+        console = Console()
+        md = Markdown(history)
+        console.print(md)
 
     @classmethod
     @option_callback