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#!/usr/bin/env python

import sys

#http://stackoverflow.com/questions/3041986/python-command-line-yes-no-input

def query_yes_no(question, default="yes"):

    """Ask a yes/no question via raw_input() and return their answer.

    "question" is a string that is presented to the user.

    "default" is the presumed answer if the user just hits <Enter>.

        It must be "yes" (the default), "no" or None (meaning

        an answer is required of the user).

    The "answer" return value is one of "yes" or "no".

    """

    valid = {"yes":True,   "y":True,  "ye":True,

             "no":False,     "n":False}

    if default == None:

        prompt = " [y/n] "

    elif default == "yes":

        prompt = " [Y/n] "

    elif default == "no":

        prompt = " [y/N] "

    else:

        raise ValueError("invalid default answer: '%s'" % default)

    while True:

        sys.stdout.write(question + prompt)

        choice = raw_input().lower()

        if default is not None and choice == '':

            return valid[default]

        elif choice in valid:

            return valid[choice]

        else:

            sys.stdout.write("Please respond with 'yes' or 'no' "\

                             "(or 'y' or 'n').\n")

def query_action(question, default="yes", action=None):

    answer = query_yes_no(question, default)

    if answer and action is not None:

        action()

def query_user(question, default=""):

    prompt = "[" + default + "]"

    sys.stdout.write(question + prompt)

    answer = raw_input()

    if answer == "":

        return default

    return answer