#!/usr/bin/env python3

import os

import string_utils


def is_running_as_root() -> bool:
    return os.geteuid() == 0


def is_are(n: int) -> str:
    if n == 1:
        return "is"
    return "are"


def pluralize(n: int) -> str:
    if n == 1:
        return ""
    return "s"


def thify(n: int) -> str:
    digit = str(n)
    assert string_utils.is_integer_number(digit)
    digit = digit[-1:]
    if digit == "1":
        return "st"
    elif digit == "2":
        return "nd"
    elif digit == "3":
        return "rd"
    else:
        return "th"