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# -*- coding: utf-8 -*-

# config.py

# This module is part of GitPython and is released under

# the BSD License: http://www.opensource.org/licenses/bsd-license.php

"""utilities to help provide compatibility with python 3"""

# flake8: noqa

import locale

import os

import sys

from gitdb.utils.encoding import (

force_bytes, # @UnusedImport

force_text # @UnusedImport

)

# typing --------------------------------------------------------------------

from typing import (

Any,

AnyStr,

Dict,

IO,

Optional,

Tuple,

Type,

Union,

overload,

)

from git.types import TBD

# ---------------------------------------------------------------------------

is_win: bool = (os.name == 'nt')

is_posix = (os.name == 'posix')

is_darwin = (os.name == 'darwin')

defenc = sys.getfilesystemencoding()

@overload

def safe_decode(s: None) -> None: ...

@overload

def safe_decode(s: AnyStr) -> str: ...

def safe_decode(s: Union[AnyStr, None]) -> Optional[str]:

"""Safely decodes a binary string to unicode"""

if isinstance(s, str):

return s

elif isinstance(s, bytes):

return s.decode(defenc, 'surrogateescape')

elif s is None:

return None

else:

raise TypeError('Expected bytes or text, but got %r' % (s,))

@overload

def safe_encode(s: None) -> None: ...

@overload

def safe_encode(s: AnyStr) -> bytes: ...

def safe_encode(s: Optional[AnyStr]) -> Optional[bytes]:

"""Safely encodes a binary string to unicode"""

if isinstance(s, str):

return s.encode(defenc)

elif isinstance(s, bytes):

return s

elif s is None:

return None

else:

raise TypeError('Expected bytes or text, but got %r' % (s,))

@overload

def win_encode(s: None) -> None: ...

@overload

def win_encode(s: AnyStr) -> bytes: ...

def win_encode(s: Optional[AnyStr]) -> Optional[bytes]:

"""Encode unicodes for process arguments on Windows."""

if isinstance(s, str):

return s.encode(locale.getpreferredencoding(False))

elif isinstance(s, bytes):

return s

elif s is not None:

raise TypeError('Expected bytes or text, but got %r' % (s,))

return None

# type: ignore ## mypy cannot understand dynamic class creation

def with_metaclass(meta: Type[Any], *bases: Any) -> TBD:

"""copied from https://github.com/Byron/bcore/blob/master/src/python/butility/future.py#L15"""

class metaclass(meta): # type: ignore

__call__ = type.__call__

__init__ = type.__init__ # type: ignore

def __new__(cls, name: str, nbases: Optional[Tuple[int, ...]], d: Dict[str, Any]) -> TBD:

if nbases is None:

return type.__new__(cls, name, (), d)

return meta(name, bases, d)

return metaclass(meta.__name__ + 'Helper', None, {}) # type: ignore

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