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# -*- coding: utf-8 -*-
# config.py
# Copyright (C) 2008, 2009 Michael Trier (mtrier@gmail.com) and contributors
#
# 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, Optional, Type
from git.types import TBD
# ---------------------------------------------------------------------------
is_win = (os.name == 'nt') # type: bool
is_posix = (os.name == 'posix')
is_darwin = (os.name == 'darwin')
defenc = sys.getfilesystemencoding()
def safe_decode(s: Optional[AnyStr]) -> 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,))
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,))
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
def with_metaclass(meta: Type[Any], *bases: Any) -> 'metaclass': # type: ignore ## mypy cannot understand dynamic class creation
"""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[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, {})