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# Copyright Jonathan Hartley 2013. BSD 3-Clause license, see LICENSE file.
from contextlib import contextmanager
from io import StringIO
import sys
import os


class StreamTTY(StringIO):
    def isatty(self):
        return True

class StreamNonTTY(StringIO):
    def isatty(self):
        return False

@contextmanager
def osname(name):
    orig = os.name
    os.name = name
    yield
    os.name = orig

@contextmanager
def replace_by(stream):
    orig_stdout = sys.stdout
    orig_stderr = sys.stderr
    sys.stdout = stream
    sys.stderr = stream
    yield
    sys.stdout = orig_stdout
    sys.stderr = orig_stderr

@contextmanager
def replace_original_by(stream):
    orig_stdout = sys.__stdout__
    orig_stderr = sys.__stderr__
    sys.__stdout__ = stream
    sys.__stderr__ = stream
    yield
    sys.__stdout__ = orig_stdout
    sys.__stderr__ = orig_stderr

@contextmanager
def pycharm():
    os.environ["PYCHARM_HOSTED"] = "1"
    non_tty = StreamNonTTY()
    with replace_by(non_tty), replace_original_by(non_tty):
        yield
    del os.environ["PYCHARM_HOSTED"]

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