Enhance argument parser

tahweel/cli.py

@@ -33,7 +33,7 @@ def prepare_package_dirs() -> None:
 
 
 def process_file(args: TahweelArgumentParser, processor: GoogleDriveOcrProcessor, file_manager: PdfFileManager) -> None:
-  if args.skip_output_check and file_manager.already_processed(args.tahweel_type, args.file_or_dir_path):
+  if not args.skip_output_check and file_manager.already_processed(args.tahweel_type, args.file_or_dir_path):
     return
 
   file_manager.to_images()

tahweel/tahweel_argument_parser.py

@@ -17,12 +17,17 @@ class TahweelArgumentParser(Tap):
   """Use this flag in development only to skip the output check."""
 
   tahweel_type: TahweelType = TahweelType.FILE
-  """Don't use this argument, it will be auto-set based on file_or_dir_path."""
+  """Don't use this argument, it will be auto-set based on `file_or_dir_path`."""
 
   def configure(self):
-    self.add_argument('file_or_dir_path', type=Path, help='Path to the file or directory to be processed')
-
-    self.add_argument('--version', action='version', version=importlib.metadata.version('tahweel'))
+    self.add_argument('file_or_dir_path', type=Path, help='Path to the file or directory to be processed.')
+
+    self.add_argument(
+      '--version',
+      action='version',
+      version=importlib.metadata.version('tahweel'),
+      help="show program's version number and exit",
+    )
 
   def process_args(self):
     self.tahweel_type = TahweelType.FILE if self.file_or_dir_path.is_file() else TahweelType.DIR