import subprocess


def exec_command(cmd, env=None, stdin=None):
    """Execute CLI command

    :param cmd: Program and arguments
    :type cmd: [str]
    :param env: Environment variables
    :type env: dict
    :param stdin: File to use for stdin
    :type stdin: file
    :returns: A tuple with the returncode, stdout and stderr
    :rtype: (int, bytes, bytes)
    """

    process = subprocess.Popen(
        cmd,
        stdin=stdin,
        stdout=subprocess.PIPE,
        stderr=subprocess.PIPE,
        env=env)

    # This is needed to get rid of '\r' from Windows's lines endings.
    stdout, stderr = [std_stream.replace(b'\r', b'')
                      for std_stream in process.communicate()]

    return (process.returncode, stdout, stderr)


def command_info(doc):
    """Get description from doc text
    :param doc: command help text
    :type doc: str
    :returns: one line description of command
    :rtype: str
    """

    return doc.split('\n')[1].strip(".").lstrip()