"""Handling of syslog-ing...
"""

from os import environ
from subprocess import Popen, PIPE, STDOUT

from io_utils import safe_decode
from utils import warn


def syslog(message, tag="style_checker", priority="local0.warn"):
    """Add the given entry to the syslog file.

    PARAMETERS
        message: The message to file.
        tag: Mark every line in the log with the specified tag.
        priority: Enter the message with the specified priority.
    """
    logger_exe = "logger"
    if "GIT_HOOKS_LOGGER" in environ:
        logger_exe = environ["GIT_HOOKS_LOGGER"]

    p = Popen(
        [logger_exe, "-t", tag, "-p", priority, message], stdout=PIPE, stderr=STDOUT
    )
    out, _ = p.communicate()
    out = safe_decode(out)
    if p.returncode != 0:
        info = [
            "Failed to file the following syslog entry:",
            "  - message: %s" % message,
            "  - tag: %s" % tag,
            "  - priority: %s" % priority,
            "",
            "logger returned with error code %d:" % p.returncode,
        ] + out.splitlines()
        warn(*info)

    elif out.rstrip():
        print(out.rstrip())