from __future__ import absolute_import, print_function


import sys
import os
import datetime


class FloatTimesInStat(object):
    """Context manager to ensure that stat returns float values.

    For 3.7 <= Mercurial < 4.6: Mercurial calls :func:`os.stat_float_times`
    for `stat` and friends to return :class:`int` values.

    Temporarily fix this.

    """

    __slots__ = ("_do_reset",)

    def __init__(self):
        self._do_reset = False

    def __enter__(self):
        if not os.stat_float_times():
            os.stat_float_times(True)
            self._do_reset = True
        return self

    def __exit__(self, *args):
        if self._do_reset:
            os.stat_float_times(False)


def to_isoformat(t):
    """Return the POSIX timestamp `t` formatted in full ISO format.

    `t` is expected to be in the UTC timezone.

    """
    dt = datetime.datetime.utcfromtimestamp(t)
    if dt.utcoffset() is None:
        return dt.isoformat() + "Z"
    else:
        return dt.isoformat()


def main():
    with FloatTimesInStat():
        for f in sys.argv[1:]:
            st = os.lstat(f)
            print(to_isoformat(st.st_mtime))


if __name__ == "__main__":
    main()