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# This Source Code Form is subject to the terms of the Mozilla Public
# License, v. 2.0. If a copy of the MPL was not distributed with this
import os
import sys
import six
class NullTerminal(object):
"""Replacement for `blessed.Terminal()` that does no formatting."""
number_of_colors = 0
width = 0
height = 0
def __init__(self, stream=None, **kwargs):
self.stream = stream or sys.__stdout__
try:
self.is_a_tty = os.isatty(self.stream.fileno())
except Exception:
self.is_a_tty = False
class NullCallableString(six.text_type):
"""A dummy callable Unicode stolen from blessings"""
def __new__(cls):
new = six.text_type.__new__(cls, "")
return new
def __call__(self, *args):
if len(args) != 1 or isinstance(args[0], int):
return ""
return args[0]
def __getattr__(self, attr):
return self.NullCallableString()
def Terminal(raises=False, disable_styling=False, **kwargs):
if disable_styling:
return NullTerminal(**kwargs)
try:
import blessed
except Exception:
if raises:
raise
return NullTerminal(**kwargs)
return blessed.Terminal(**kwargs)