why does the order matter?

manga_translator/__main__.py

@@ -4,6 +4,7 @@
 from argparse import Namespace
 
 from manga_translator import Config
+from manga_translator.args import parser, reparse
 from .manga_translator import (
     set_main_logger, load_dictionary, apply_dictionary,
 )
@@ -85,7 +86,9 @@ async def dispatch(args: Namespace):
     args = None
     init_logging()
     try:
-        args = parser.parse_args()
+        args, unknown = parser.parse_known_args()
+        parser.add_argument_group()
+        args = Namespace(**{**vars(args), **vars(reparse(unknown))})
         set_log_level(level=logging.DEBUG if args.verbose else logging.INFO)
         logger = get_logger(args.mode)
         set_main_logger(logger)

manga_translator/args.py

@@ -76,22 +76,37 @@ def _format_action_invocation(self, action: argparse.Action) -> str:
         else:
             return super()._format_action_invocation(action)
 
+def general_parser(g_parser):
+    g_parser.add_argument('-v', '--verbose', action='store_true',
+                        help='Print debug info and save intermediate images in result folder')
+    g_parser.add_argument('--attempts', default=0, type=int,
+                        help='Retry attempts on encountered error. -1 means infinite times.')
+    g_parser.add_argument('--ignore-errors', action='store_true', help='Skip image on encountered error.')
+    g_parser.add_argument('--model-dir', default=None, type=dir_path,
+                        help='Model directory (by default ./models in project root)')
+    g = g_parser.add_mutually_exclusive_group()
+    g.add_argument('--use-gpu', action='store_true', help='Turn on/off gpu (auto switch between mps and cuda)')
+    g.add_argument('--use-gpu-limited', action='store_true', help='Turn on/off gpu (excluding offline translator)')
+    g_parser.add_argument('--font-path', default='', type=file_path, help='Path to font file')
+    g_parser.add_argument('--pre-dict', default=None, type=file_path, help='Path to the pre-translation dictionary file')
+    g_parser.add_argument('--post-dict', default=None, type=file_path,
+                        help='Path to the post-translation dictionary file')
+    g_parser.add_argument('--kernel-size', default=3, type=int,
+                        help='Set the convolution kernel size of the text erasure area to completely clean up text residues')
+
+
+
+def reparse(arr: list):
+    p = argparse.ArgumentParser(prog='manga_translator',
+                                     description='Seamlessly translate mangas into a chosen language',
+                                     formatter_class=HelpFormatter)
+    general_parser(p)
+    return p.parse_args(arr)
 
 parser = argparse.ArgumentParser(prog='manga_translator', description='Seamlessly translate mangas into a chosen language', formatter_class=HelpFormatter)
+general_parser(parser)
 subparsers = parser.add_subparsers(dest='mode', required=True, help='Mode of operation')
 
-parser.add_argument('-v', '--verbose', action='store_true', help='Print debug info and save intermediate images in result folder')
-parser.add_argument('--attempts', default=0, type=int, help='Retry attempts on encountered error. -1 means infinite times.')
-parser.add_argument('--ignore-errors', action='store_true', help='Skip image on encountered error.')
-parser.add_argument('--model-dir', default=None, type=dir_path, help='Model directory (by default ./models in project root)')
-g = parser.add_mutually_exclusive_group()
-g.add_argument('--use-gpu', action='store_true', help='Turn on/off gpu (auto switch between mps and cuda)')
-g.add_argument('--use-gpu-limited', action='store_true', help='Turn on/off gpu (excluding offline translator)')
-parser.add_argument('--font-path', default='', type=file_path, help='Path to font file')
-parser.add_argument('--pre-dict', default=None, type=file_path, help='Path to the pre-translation dictionary file')
-parser.add_argument('--post-dict', default=None, type=file_path, help='Path to the post-translation dictionary file')
-parser.add_argument('--kernel-size', default=3, type=int, help='Set the convolution kernel size of the text erasure area to completely clean up text residues')
-
 # Batch mode
 parser_batch = subparsers.add_parser('local', help='Run in batch translation mode')
 parser_batch.add_argument('-i', '--input', required=True, type=path, nargs='+', help='Path to an image folder')