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import sys

from . import compat

"""Module to deal with filename encoding on the local system, as returned by

Watchman."""

if compat.PYTHON3:

    default_local_errors = "surrogateescape"

    def get_local_encoding():

        if sys.platform == "win32":

            # Watchman always returns UTF-8 encoded strings on Windows.

            return "utf-8"

        # On the Python 3 versions we support, sys.getfilesystemencoding never

        # returns None.

        return sys.getfilesystemencoding()

else:

    # Python 2 doesn't support surrogateescape, so use 'strict' by

    # default. Users can register a custom surrogateescape error handler and use

    # that if they so desire.

    default_local_errors = "strict"

    def get_local_encoding():

        if sys.platform == "win32":

            # Watchman always returns UTF-8 encoded strings on Windows.

            return "utf-8"

        fsencoding = sys.getfilesystemencoding()

        if fsencoding is None:

            # This is very unlikely to happen, but if it does, just use UTF-8

            fsencoding = "utf-8"

        return fsencoding

def encode_local(s):

    return s.encode(get_local_encoding(), default_local_errors)

def decode_local(bs):

    return bs.decode(get_local_encoding(), default_local_errors)