decide and roll phenny commands

## Import and setup lines

import random
from operator import add, sub
import re

DICE_REGEX = re.compile('^(\d+)?\s*d\s*(\d+)(?:\s*(\+|-)\s*(\d+))?$')

## Function decleration

def decide(phenny, input):
    """.decide - Deciding function."""
    msg = input.groups()[1]
    if msg is None:
        msg = ''      # Hack
    if '|' in msg:
        msg = [i.strip() for i in msg.split('|')]
        if not all(msg):
            ret = "I'm sorry {}, but some of those options don't exist."
            ret = ret.format(input.nick)
        else:
            ret = '{}: {}'.format(input.nick, random.choice(msg))
    else:
        ret  = "I'm sorry {}, but you haven't given me anything "
        ret += "to choose from there."
        ret  = ret.format(input.nick)
    phenny.say(ret)

decide.commands = ['decide', 'choose']
decide.priority = "low"
decide.example = ".decide option 1 | option 2"

def roll(phenny, input):
    msg = input.groups()[1]
    if not msg: # Then there was no message.
        ret = "{}: {}".format(input.nick, random.randrange(1,7))
        phenny.say(ret)
        return
    # Otherwise, deal with a dnd roll.
    msg = msg.strip()
    match = DICE_REGEX.match(msg)
    if match:
        dice_no, sides, op, mod = match.groups()     # Un-group the match
        sides = int(sides)
        dice_no = 1 if dice_no is None else int(dice_no)   # Set optional params
        mod = 0 if mod is None else int(mod)               # to default.
        op = add if op == '+' else sub

        if dice_no > 20:  # You cannot be serious.
            phenny.say("There are way too many dice there for me to "
                      "keep track of.  What do you think I am, a robot?")
            return

        roll_list = []
        for i in range(dice_no):
            roll_list.append(random.randint(1,sides))

        total = op(sum(roll_list), mod)
        ret = "{}: You rolled {}".format(input.nick, total)
        if 1 < dice_no < 10:
            ret += " made from {}".format(str(roll_list))
        phenny.say(ret)
        return

    else:
        phenny.say("That doesn't appear to be a dnd roll.  Try just .roll")

roll.commands = ['roll']
roll.priority = 'low'
roll.example = '.roll or .roll 3d6 [or .roll d6 + 3 etc]'