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import fcntl
import os
import struct
import sys
import termios
from collections import namedtuple
terminal_size = namedtuple('terminal_size', ['columns', 'lines'])
py2 = sys.version_info[0] == 2
def get_terminal_size(fallback=(80, 24)):
"""Based on Python 3 os.get_terminal_size()"""
# columns, lines are the working values
try:
columns = int(os.environ['COLUMNS'])
except (KeyError, ValueError):
columns = 0
try:
lines = int(os.environ['LINES'])
except (KeyError, ValueError):
lines = 0
# only query if necessary
if columns <= 0 or lines <= 0:
try:
winsize = fcntl.ioctl(sys.__stdout__.fileno(),
termios.TIOCGWINSZ, '\000' * 8)
size = terminal_size(*struct.unpack('hhhh', winsize)[1::-1])
except (NameError, OSError):
size = terminal_size(*fallback)
if columns <= 0:
columns = size.columns
if lines <= 0:
lines = size.lines
return terminal_size(*size)
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