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###############################################################################
#
# The MIT License (MIT)
#
# Copyright (c) Tavendo GmbH
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.
#
###############################################################################
from __future__ import absolute_import, division
from six import PY3, PY2
if PY3:
unicode = str
else:
unicode = unicode
def guess_stream_needs_encoding(fileobj, default=True):
"""
Guess the type (bytes/unicode) of this stream, and return whether or not it
requires text to be encoded before written into it.
"""
# XXX: Unicode
# On Python 2, stdout is bytes. However, we can't wrap it in a
# TextIOWrapper, as it's not from IOBase, so it doesn't have .seekable.
# It does, however, have a mode, and we can cheese it base on that.
# On Python 3, stdout is a TextIOWrapper, and so we can safely write
# str to it, and it will encode it correctly for the target terminal or
# whatever.
# If it's a io.BytesIO or StringIO, then it won't have a mode, but it
# is a read/write stream, so we can get its type by reading 0 bytes and
# checking the type.
try:
# If it's a r/w stream, this will give us the type of it
t = type(fileobj.read(0))
if t is bytes:
return True
elif t is unicode:
return False
except:
pass
try:
mode = fileobj.mode
if PY2 and mode == "w":
mode = "wb"
if "b" in mode:
return True
else:
return False
except:
pass
return default
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