vt100.py 文件源码

def _get_size(fileno):
    # Thanks to fabric (fabfile.org), and
    # http://sqizit.bartletts.id.au/2011/02/14/pseudo-terminals-in-python/
    """
    Get the size of this pseudo terminal.

    :param fileno: stdout.fileno()
    :returns: A (rows, cols) tuple.
    """
    # Inline imports, because these modules are not available on Windows.
    # (This file is used by ConEmuOutput, which is used on Windows.)
    import fcntl
    import termios

    # Buffer for the C call
    buf = array.array(b'h' if six.PY2 else u'h', [0, 0, 0, 0])

    # Do TIOCGWINSZ (Get)
    # Note: We should not pass 'True' as a fourth parameter to 'ioctl'. (True
    #       is the default.) This causes segmentation faults on some systems.
    #       See: https://github.com/jonathanslenders/python-prompt-toolkit/pull/364
    fcntl.ioctl(fileno, termios.TIOCGWINSZ, buf)

    # Return rows, cols
    return buf[0], buf[1]