feat: implement moving commands

add exceptions and handler for commands that move locations

3 files changed, 19 insertions, 1 deletions

diff --git a/bot/constants.py b/bot/constants.py
index f4b1cab0..854fbe55 100644
--- a/bot/constants.py
+++ b/bot/constants.py
@@ -23,6 +23,7 @@ __all__ = (
     "Reddit",
     "RedisConfig",
     "RedirectOutput",
+    "PYTHON_PREFIX"
     "MODERATION_ROLES",
     "STAFF_ROLES",
     "WHITELISTED_CHANNELS",
@@ -34,6 +35,8 @@ __all__ = (
 log = logging.getLogger(__name__)
 
 
+PYTHON_PREFIX = "!"
+
 @dataclasses.dataclass
 class AdventOfCodeLeaderboard:
     id: str
diff --git a/bot/exts/core/error_handler.py b/bot/exts/core/error_handler.py
index fd2123e7..676a1e70 100644
--- a/bot/exts/core/error_handler.py
+++ b/bot/exts/core/error_handler.py
@@ -12,7 +12,7 @@ from sentry_sdk import push_scope
 from bot.bot import Bot
 from bot.constants import Channels, Colours, ERROR_REPLIES, NEGATIVE_REPLIES, RedirectOutput
 from bot.utils.decorators import InChannelCheckFailure, InMonthCheckFailure
-from bot.utils.exceptions import APIError, UserNotPlayingError
+from bot.utils.exceptions import APIError, MovedCommandError, UserNotPlayingError
 
 log = logging.getLogger(__name__)
 
@@ -130,6 +130,14 @@ class CommandErrorHandler(commands.Cog):
             )
             return
 
+        if isinstance(error, MovedCommandError):
+            description = (
+                f"This command, `{ctx.prefix}{ctx.command.qualified_name}` has moved to `{error.new_command_name}`.\n"
+                f"Please use `{error.new_command_name}` instead."
+            )
+            await ctx.send(embed=self.error_embed(description, NEGATIVE_REPLIES))
+            return
+
         with push_scope() as scope:
             scope.user = {
                 "id": ctx.author.id,
diff --git a/bot/utils/exceptions.py b/bot/utils/exceptions.py
index bf0e5813..3cd96325 100644
--- a/bot/utils/exceptions.py
+++ b/bot/utils/exceptions.py
@@ -15,3 +15,10 @@ class APIError(Exception):
         self.api = api
         self.status_code = status_code
         self.error_msg = error_msg
+
+
+class MovedCommandError(Exception):
+    """Raised when a command has moved locations."""
+
+    def __init__(self, new_command_name: str):
+        self.new_command_name = new_command_name