winziprint: add error parameter for usage()

winziprint/winziprint.py

@@ -108,7 +108,7 @@ def _wrapper_convert(args: list[str], encoding: str = None, padding: bool = Fals
         gc.collect()
 
 
-def usage() -> None:
+def usage(error: bool = False) -> None:
     print(f'usage: {sys.argv[0]} [-h] [-v] [-p] [-2] [-d DIR] [-e ENCODING] [ - | INPUT [INPUT...] OUTPUT ]\n\n'
           'options:\n'
           ' -h, --help          show this help message and exit\n'
@@ -120,15 +120,16 @@ def usage() -> None:
           '\n'
           ' -                   use stdin for retrieving input and output file names (semi-colon-seperated)\n'
           ' INPUT               name of an html input file\n'
-          ' OUTPUT              name of an pdf output file', file=sys.stderr)
-    sys.exit(1)
+          ' OUTPUT              name of an pdf output file',
+          file=sys.stderr if error else sys.stdout)
+    sys.exit(1 if error else 0)
 
 
 def version() -> None:
     print(f'WinziPrint: {__version__}\n'
-          f'WeasyPrint: {weasyprint.__version__}',
-          file=sys.stderr)
-    sys.exit(1)
+          f'WeasyPrint: {weasyprint.__version__}\n'
+          f'pypdf: {pypdf.__version__}')
+    sys.exit(0)
 
 
 def _get_arg(args: list[str], n1: str, n2: str = None, flag: bool = False) -> Union[None, str, bool]:
@@ -142,7 +143,7 @@ def _get_arg(args: list[str], n1: str, n2: str = None, flag: bool = False) -> Un
             if n in args:
                 i = args.index(n)
                 if i + 1 >= len(args):
-                    usage()
+                    usage(True)
                 v = args[i + 1]
                 args.pop(i)
                 args.pop(i)
@@ -167,7 +168,7 @@ def main() -> None:
         for line in sys.stdin:
             _wrapper_convert(line.strip().split(';'), encoding=encoding, padding=double_paged, progress=progress)
     elif len(args) < 2:
-        usage()
+        usage(True)
     else:
         _wrapper_convert(args, encoding=encoding, padding=double_paged, progress=progress)