emitting.py 文件源码

def _page(output, pager_command=None):
    """Conditionally pipes the supplied output through a pager.

    :param output:
    :type output: object
    :param pager_command:
    :type pager_command: str
    """

    output = six.text_type(output)

    if not sys.stdout.isatty() or util.is_windows_platform():
        print(output)
        sys.stdout.flush()
        return

    num_lines = output.count('\n')
    exceeds_tty_height = pager.getheight() - 1 < num_lines

    if pager_command is None:
        pager_command = 'less -R'

    try:
        paginate = config.get_config_val("core.pagination")
    except:
        paginate = True
    if exceeds_tty_height and paginate and \
            spawn.find_executable(pager_command.split(' ')[0]) is not None:
        pydoc.pipepager(output, cmd=pager_command)
    else:
        print(output)