feat: basic commands + prototype of roll parser

dice.py

@@ -0,0 +1,34 @@
+from random import randint
+
+from pyparsing import Combine, OpAssoc, Word, infix_notation, nums, one_of
+
+SEPARATOR = "|"
+
+
+class Dice:
+    def __init__(self, tokens):
+        split_tokens = tokens[0].split(SEPARATOR)
+        self.dice, self.faces = split_tokens[0], split_tokens[2]
+
+
+def roll_parse(roll):
+    integer = Word(nums)
+    dice = Combine(integer + "d" + integer, join_string="|")
+    dice.set_parse_action(Dice)
+
+    expr = infix_notation(
+        dice | integer,
+        [
+            ("-", 1, OpAssoc.RIGHT),
+            (one_of("* /"), 2, OpAssoc.LEFT),
+            (one_of("+ -"), 2, OpAssoc.LEFT),
+        ],
+    )
+
+    return expr.parse_string(roll, parse_all=True)
+
+
+async def roll(bot, mtch, room, message):
+    await bot.api.send_text_message(
+        room.room_id, str(roll_parse(" ".join(mtch.args())))
+    )