Fix: fixed pipe data

Author: ForNeus57

src/python/app/command/io.py

@@ -8,7 +8,7 @@ def map_input(input_source: str) -> BinaryIO:
     """Maps input source to stdin or to the file path"""
 
     if input_source is None:
-        return stdin.buffer
+        return BytesIO(stdin.buffer.read())
 
     with open(input_source, mode='rb', buffering=16384) as file:
         return BytesIO(file.read())

src/python/app/command/parser.py

@@ -14,13 +14,15 @@ def get_parser() -> ArgumentParser:
 
     parser = ArgumentParser(prog='PROG',
                             description='Image CLI that performs different image operations like scaling, rotating etc')
-    parser.add_argument('input',
+    parser.add_argument('--input', '-i',
                         nargs='?',
                         default=None,
+                        dest='input',
                         help='program input')
-    parser.add_argument('output',
+    parser.add_argument('--output', '-o',
                         nargs='?',
                         default=None,
+                        dest='output',
                         help='program output')
     parser.add_argument('--output-format',
                         nargs='?',