feat(bot): ✨ Make ban durations stack.

payphone/bot.py

@@ -1,6 +1,6 @@
 from typing import Literal
 
-from datetime import datetime, timezone
+from datetime import datetime, timezone, timedelta
 
 import discord
 from discord import abc
@@ -147,7 +147,7 @@ class Payphone(commands.AutoShardedBot):
     async def ban(
         self,
         user: discord.User | discord.Member | models.User | int,
-        until: datetime | None,
+        duration: timedelta | None,
         reason: str,
         moderator: discord.User | discord.Member | models.User | int | None = None,
     ) -> models.Ban:
@@ -155,7 +155,7 @@ class Payphone(commands.AutoShardedBot):
 
         Args:
             user (discord.User | discord.Member | models.User | int): The user to ban or their ID.
-            until (datetime | None): The expiry date, or None if it does not expire.
+            duration (timedelta | None): The expiry date, or None if it does not expire.
             reason (str): The reason of the ban.
             moderator (discord.User | discord.Member | models.User | int | None, optional): The
               moderator who performed the action.
@@ -173,6 +173,23 @@ class Payphone(commands.AutoShardedBot):
             else moderator
         )
 
+        until = datetime.now(timezone.utc) + duration if duration is not None else None
+
+        if duration is not None:
+            last_ban = (
+                await models.Ban.filter(user_id=user_id)
+                .order_by("-created_at")
+                .limit(1)
+                .first()
+            )
+
+            if last_ban is not None:
+                until = (
+                    duration + last_ban.expires_at
+                    if last_ban.expires_at is not None
+                    else None
+                )
+
         row = await models.Ban.create(
             user_id=user_id,
             reason=reason,