Improve type support a bit more (#333)

Also fix default voice for util.py

Signed-off-by: rany <rany2@riseup.net>

src/edge_tts/util.py

@@ -3,14 +3,16 @@
 import argparse
 import asyncio
 import sys
-from typing import Any, Optional, TextIO
+from typing import Optional, TextIO
 
 from tabulate import tabulate
 
 from . import Communicate, SubMaker, list_voices
+from .constants import DEFAULT_VOICE
+from .data_classes import UtilArgs
 
 
-async def _print_voices(*, proxy: str) -> None:
+async def _print_voices(*, proxy: Optional[str]) -> None:
     """Print all available voices."""
     voices = await list_voices(proxy=proxy)
     voices = sorted(voices, key=lambda voice: voice["ShortName"])
@@ -27,7 +29,7 @@ async def _print_voices(*, proxy: str) -> None:
     print(tabulate(table, headers))
 
 
-async def _run_tts(args: Any) -> None:
+async def _run_tts(args: UtilArgs) -> None:
     """Run TTS after parsing arguments from command line."""
 
     try:
@@ -84,15 +86,17 @@ async def _run_tts(args: Any) -> None:
 
 async def amain() -> None:
     """Async main function"""
-    parser = argparse.ArgumentParser(description="Microsoft Edge TTS")
+    parser = argparse.ArgumentParser(
+        description="Text-to-speech using Microsoft Edge's online TTS service."
+    )
     group = parser.add_mutually_exclusive_group(required=True)
     group.add_argument("-t", "--text", help="what TTS will say")
     group.add_argument("-f", "--file", help="same as --text but read from file")
     parser.add_argument(
         "-v",
         "--voice",
-        help="voice for TTS. Default: en-US-AriaNeural",
-        default="en-US-AriaNeural",
+        help=f"voice for TTS. Default: {DEFAULT_VOICE}",
+        default=DEFAULT_VOICE,
     )
     group.add_argument(
         "-l",
@@ -111,7 +115,7 @@ async def amain() -> None:
         help="send subtitle output to provided file instead of stderr",
     )
     parser.add_argument("--proxy", help="use a proxy for TTS and voice list.")
-    args = parser.parse_args()
+    args = parser.parse_args(namespace=UtilArgs())
 
     if args.list_voices:
         await _print_voices(proxy=args.proxy)