give better output to discord of dice rolls, handle errors

hitomi/dice.py

@@ -1,10 +1,11 @@
 """Commands for dice rolling type behavior."""
 import logging
+import re
 
 from discord.ext import commands
 
 from hitomi import bot
-from hitomi.backends import dr_botzo
+from hitomi.backends import dr_botzo, DrBotzoError
 
 logger = logging.getLogger(__name__)
 
@@ -13,15 +14,23 @@ class Dice(commands.Cog):
     """Commands for rolling dice and whatnot."""
 
     @commands.command()
-    async def roll(self, ctx, dice):
+    async def roll(self, ctx, *, dice):
         """Roll a provided dice string.
 
         Format: T#K/NdS+M; T = times, K = keep, N = number, S = sides, M = modifier
         """
+        await ctx.trigger_typing()
         logger.info("rolling dice: %s", dice)
-        result = dr_botzo.post('/dice/rpc/roll/', json={'dice': dice})
-        logger.debug(result)
-        await ctx.send(result.json())
+        try:
+            response = dr_botzo.post('/dice/rpc/roll/', json={'dice': dice})
+            response.raise_for_status()
+            logger.debug("result of rolling dice: HTTP %s, %s", response.status_code, response.text)
+            output = re.sub(r'(\d+)(.*?\s+)(\(.*?\))', r'**\1**\2\3', response.json()['result'])
+            output = '\n'.join(output.split('; '))
+            await ctx.send(output)
+        except DrBotzoError as drex:
+            logger.exception("received an error from dr.botzo attempting to roll %s: %s", dice, drex)
+            await ctx.send(f"*{drex.detail}*")
 
 
 bot.add_cog(Dice(bot))