diceroller.py: Implemented argument parsing

diceroller.py

@@ -8,9 +8,10 @@
 import random
 import sys
 import re
+import argparse
+
 
 # Implements a "dice" - that is, a series of dice plus modifiers
-# fixme: implement rerolls (currently they do nothing!)
 class Dice():
     def __init__(self, num, sides, mod, drop_low=0, drop_high=0, reroll=0, reroll_times=0):
         self.num = num
@@ -23,7 +24,7 @@ class Dice():
         self.times_rolled = 0
         
     # Rolls the dice, prints the result
-    def roll(self, verbose=True): # fixme: default verbose to False and add -v flag
+    def roll(self, verbose=False):
         results = []
         rerolled = []
 
@@ -61,9 +62,10 @@ class Dice():
         # Get the results
         total = sum(results) + self.mod
 
+        # fixme - verbose mode could use slightly better formatting re: drop_info and reroll_info...
         if verbose:
-            drop_info = None
-            reroll_info = None
+            drop_info = ''
+            reroll_info = ''
 
             if dropped:
                 drop_info = '[dropped {}]'.format(','.join(['{}'.format(x) for x in dropped]))
@@ -143,13 +145,44 @@ def parse_input(args):
     return dice_list
 
 
+def parse_args():
+    parser = argparse.ArgumentParser(description='Roll dice based on descriptions passed in on the command line', formatter_class=argparse.RawTextHelpFormatter)
+    parser.add_argument('--repeat', '-r', metavar='N', type=int, default=1, help='repeat the given rolls N times')
+    parser.add_argument('--verbose', '-v', action='store_true', help='print detailed information about each roll')
+    parser.add_argument('dice', nargs=argparse.REMAINDER, help="""
+Dice are input in the following form:
+
+XdY[modifiers]
+
+This will roll X Y-sided dice and apply the specified modifiers.
+
+Modifiers can be any of the following (where N and M are integers):
+
+(+|-)N   Add or subtract N from the total
+lN       Drop the lowest-rolling N dice from the total
+hN       Drop the highest-rolling N dice from the total
+rN[xM]   Any dice that roll <= N will be rerolled.
+         If the optional 'xM' option is specified, dice will be rerolled a maximum of M times.
+         Otherwise each die will be rerolled until the result is > N
+
+Examples:
+
+1d20+5      roll 1 twenty-sided die, and add 5 to the result
+6d6l1h1     roll 6 six-sided dice, and drop both the highest and the lowest roll
+4d6l1r2x1   roll 4 six-sided dice. Any dice rolling a 1 or 2 will be rerolled once.
+            If the result is still 1 or 2 it is kept. The lowest die is dropped from the result
+""")
+    return parser.parse_args()
+    
+
+
 def main():
-    # fixme: command line arguments! get some argparse over here
-
-    dice_list = parse_input(sys.argv)
+    settings = parse_args()
+    dice_list = parse_input(settings.dice)
 
+    for i in range(settings.repeat):
         for dice in dice_list:
-        dice.roll()
+            dice.roll(verbose=settings.verbose)
 
 
 if __name__ == '__main__':