check and convert command line parameter for windows

[gitnol]

Hi,

On windows, an error occurs in mitmproxy2swagger.py line 63 because yaml.load(f) does not like the backslash in the f string (the input parameter -o)

mitmproxy2swagger/mitmproxy2swagger/mitmproxy2swagger.py

Line 62 in fd382ed

with open(args.output, 'r') as f:

mitmproxy2swagger -i "D:\Downloads\flows" -o "D:\Downloads\flows_schema.yml" -p https://my.site.com

If you change it to a slash, there is no problem and it works like intended.
mitmproxy2swagger -i "D:/Downloads/flows" -o "D:/Downloads/flows_schema.yml" -p https://my.site.com

Therefore, my suggestion/solution is to replace '' with '/'

import os
args.output = arg.output.replace(os.sep, '/')
args.input = args.input.replace(os.sep, '/')

Traceback:

Traceback (most recent call last):
  File "C:\Users\redacted\AppData\Local\Programs\Python\Python310\lib\runpy.py", line 196, in _run_module_as_main
    return _run_code(code, main_globals, None,
  File "C:\Users\redacted\AppData\Local\Programs\Python\Python310\lib\runpy.py", line 86, in _run_code
    exec(code, run_globals)
  File "C:\Users\redacted\AppData\Local\Programs\Python\Python310\Scripts\mitmproxy2swagger.exe\__main__.py", line 7, in 
  File "C:\Users\redacted\AppData\Local\Programs\Python\Python310\lib\site-packages\mitmproxy2swagger\mitmproxy2swagger.py", line 63, in main
    swagger = yaml.load(f)
  File "C:\Users\redacted\AppData\Local\Programs\Python\Python310\lib\site-packages\ruamel\yaml\main.py", line 434, in load
    return constructor.get_single_data()
  File "C:\Users\redacted\AppData\Local\Programs\Python\Python310\lib\site-packages\ruamel\yaml\constructor.py", line 119, in get_single_data
    node = self.composer.get_single_node()
  File "C:\Users\redacted\AppData\Local\Programs\Python\Python310\lib\site-packages\ruamel\yaml\composer.py", line 76, in get_single_node
    document = self.compose_document()
  File "C:\Users\redacted\AppData\Local\Programs\Python\Python310\lib\site-packages\ruamel\yaml\composer.py", line 99, in compose_document
    node = self.compose_node(None, None)
  File "C:\Users\redacted\AppData\Local\Programs\Python\Python310\lib\site-packages\ruamel\yaml\composer.py", line 143, in compose_node
    node = self.compose_mapping_node(anchor)
  File "C:\Users\redacted\AppData\Local\Programs\Python\Python310\lib\site-packages\ruamel\yaml\composer.py", line 223, in compose_mapping_node
    item_value = self.compose_node(node, item_key)
  File "C:\Users\redacted\AppData\Local\Programs\Python\Python310\lib\site-packages\ruamel\yaml\composer.py", line 141, in compose_node
    node = self.compose_sequence_node(anchor)
  File "C:\Users\redacted\AppData\Local\Programs\Python\Python310\lib\site-packages\ruamel\yaml\composer.py", line 184, in compose_sequence_node
    while not self.parser.check_event(SequenceEndEvent):
  File "C:\Users\redacted\AppData\Local\Programs\Python\Python310\lib\site-packages\ruamel\yaml\parser.py", line 146, in check_event
    self.current_event = self.state()
  File "C:\Users\redacted\AppData\Local\Programs\Python\Python310\lib\site-packages\ruamel\yaml\parser.py", line 565, in parse_indentless_sequence_entry
    if not self.scanner.check_token(
  File "C:\Users\redacted\AppData\Local\Programs\Python\Python310\lib\site-packages\ruamel\yaml\scanner.py", line 1794, in check_token
    while self.need_more_tokens():
  File "C:\Users\redacted\AppData\Local\Programs\Python\Python310\lib\site-packages\ruamel\yaml\scanner.py", line 211, in need_more_tokens
    self.stale_possible_simple_keys()
  File "C:\Users\redacted\AppData\Local\Programs\Python\Python310\lib\site-packages\ruamel\yaml\scanner.py", line 360, in stale_possible_simple_keys
    raise ScannerError(
ruamel.yaml.scanner.ScannerError: while scanning a simple key
  in "D:\Downloads\flows_schema.yml", line 86, column 1
could not find expected ':'
  in "D:\Downloads\flows_schema.yml", line 87, column 1