1 files changed, 70 insertions, 0 deletions
diff --git a/scripts/roll-die b/scripts/roll-die
new file mode 100755
index 0000000..8135b0b
--- /dev/null
+++ b/scripts/roll-die
@@ -0,0 +1,70 @@
+#!/usr/bin/env python3
+
+import random
+import sys
+from pathlib import Path
+import re
+
+
+def roll_die(num_dice: int, dice_type: int, modifier: int) -> [int]:
+    rolls = []
+    for i in range(num_dice):
+        rolls.append(random.randint(1, dice_type) + modifier)
+
+    return rolls
+
+
+def parse_dice_notation(dice_notation) -> (int, int, int):
+    # Define the regular expression pattern
+    pattern = re.compile(r'(\d+)d(\d+)([+-]\d+)?')
+
+    # Search the pattern in the dice notation string
+    match = pattern.match(dice_notation)
+
+    if not match:
+        raise ValueError(f"Invalid dice notation: {dice_notation}")
+
+    # Extract the groups from the match
+    groups = match.groups()
+
+    # Convert the groups to integers and handle the optional modifier
+    num_dice = int(groups[0])
+    dice_type = int(groups[1])
+    modifier = int(groups[2]) if groups[2] else 0
+
+    return num_dice, dice_type, modifier
+
+
+def summary(rolls: [int]) -> None:
+    print(rolls)
+    print(f'Min: {min(rolls)}')
+    print(f'Max: {max(rolls)}')
+    if len(rolls) > 1:
+        print(f'Total: {sum(rolls)}')
+        print(f'Avg: {sum(rolls)/len(rolls):.2f}')
+
+
+def main():
+    if len(sys.argv) != 2:
+        path = Path(sys.argv[0]).parts[-1]
+        print(f"Usage: {path} xdy[(+|y)z]")
+        print("Rolls x number of y sided die, optionally using a modifier z")
+        print()
+        print("Examples:")
+        print("\t2d4+2 Rolls two four sided die adding 2 to each roll")
+        print("\t1d20-1 Rolls a single twenty and subtracts 1 from the roll")
+        sys.exit(1)
+
+    dice_notation = sys.argv[1]
+
+    try:
+        num_die, die_type, modifier = parse_dice_notation(dice_notation)
+    except ValueError as e:
+        print(e)
+
+    rolls = roll_die(num_die, die_type, modifier)
+    summary(rolls)
+
+
+if __name__ == "__main__":
+    main()