Fix style errors reported by linters

Author: pastor-robert

pdfly/booklet.py

@@ -20,7 +20,7 @@
 import sys
 import traceback
 from pathlib import Path
-from typing import Generator, Tuple
+from typing import Generator, Optional, Tuple
 
 from pypdf import (
     PageObject,
@@ -33,8 +33,8 @@
 def main(
     filename: Path,
     output: Path,
-    inside_cover_file: Path,
-    centerfold_file: Path,
+    inside_cover_file: Optional[Path],
+    centerfold_file: Optional[Path],
 ) -> None:
     try:
         # Set up the streams

pdfly/cli.py

@@ -98,6 +98,7 @@ def cat(
 ) -> None:
     pdfly.cat.main(filename, fn_pgrgs, output, verbose)
 
+
 @entry_point.command(name="booklet", help=pdfly.booklet.__doc__)  # type: ignore[misc]
 def booklet(
     filename: Annotated[
@@ -114,27 +115,29 @@ def booklet(
             dir_okay=False,
             exists=False,
             resolve_path=False,
-        )
+        ),
     ],
     blank_page: Annotated[
         Optional[Path],
         typer.Option(
-            "-b", "--blank-page-file",
+            "-b",
+            "--blank-page-file",
             help="page added if input is odd number of pages",
             dir_okay=False,
             exists=True,
             resolve_path=True,
         ),
     ] = None,
     centerfold: Annotated[
-        Path,
+        Optional[Path],
         typer.Option(
-            "-c", "--centerfold-file",
+            "-c",
+            "--centerfold-file",
             help="double-page added if input is missing >= 2 pages",
             dir_okay=False,
             exists=True,
             resolve_path=True,
-        )
+        ),
     ] = None,
 ) -> None:
     pdfly.booklet.main(filename, output, blank_page, centerfold)