1 files changed, 109 insertions, 0 deletions
diff --git a/bot/seasons/evergreen/error_handler.py b/bot/seasons/evergreen/error_handler.py
new file mode 100644
index 00000000..6de35e60
--- /dev/null
+++ b/bot/seasons/evergreen/error_handler.py
@@ -0,0 +1,109 @@
+import logging
+import math
+import sys
+import traceback
+
+from discord.ext import commands
+
+log = logging.getLogger(__name__)
+
+
+class CommandErrorHandler:
+    """A error handler for the PythonDiscord server!"""
+
+    def __init__(self, bot):
+        self.bot = bot
+
+    async def on_command_error(self, ctx, error):
+        """Activates when a command opens an error"""
+
+        if hasattr(ctx.command, 'on_error'):
+            return logging.debug(
+                "A command error occured but "
+                "the command had it's own error handler"
+            )
+        error = getattr(error, 'original', error)
+        if isinstance(error, commands.CommandNotFound):
+            return logging.debug(
+                f"{ctx.author} called '{ctx.message.content}' "
+                "but no command was found"
+            )
+        if isinstance(error, commands.UserInputError):
+            logging.debug(
+                f"{ctx.author} called the command '{ctx.command}' "
+                "but entered invalid input!"
+            )
+            return await ctx.send(
+                ":no_entry: The command you specified failed to run."
+                "This is because the arguments you provided were invalid."
+            )
+        if isinstance(error, commands.CommandOnCooldown):
+            logging.debug(
+                f"{ctx.author} called the command '{ctx.command}' "
+                "but they were on cooldown!"
+            )
+            return await ctx.send(
+                "This command is on cooldown,"
+                f" please retry in {math.ceil(error.retry_after)}s."
+            )
+        if isinstance(error, commands.DisabledCommand):
+            logging.debug(
+                f"{ctx.author} called the command '{ctx.command}' "
+                "but the command was disabled!"
+            )
+            return await ctx.send(
+                ":no_entry: This command has been disabled."
+            )
+        if isinstance(error, commands.NoPrivateMessage):
+            logging.debug(
+                f"{ctx.author} called the command '{ctx.command}' "
+                "in a private message however the command was guild only!"
+            )
+            return await ctx.author.send(
+                ":no_entry: This command can only be used inside a server."
+            )
+        if isinstance(error, commands.BadArgument):
+            if ctx.command.qualified_name == 'tag list':
+                logging.debug(
+                    f"{ctx.author} called the command '{ctx.command}' "
+                    "but entered an invalid user!"
+                )
+                return await ctx.send(
+                    "I could not find that member. Please try again."
+                )
+            else:
+                logging.debug(
+                    f"{ctx.author} called the command '{ctx.command}' "
+                    "but entered a bad argument!"
+                )
+                return await ctx.send(
+                    "The argument you provided was invalid."
+                )
+        if isinstance(error, commands.CheckFailure):
+            logging.debug(
+                f"{ctx.author} called the command '{ctx.command}' "
+                "but the checks failed!"
+            )
+            return await ctx.send(
+                ":no_entry: You are not authorized to use this command."
+            )
+        print(
+            f"Ignoring exception in command {ctx.command}:",
+            file=sys.stderr
+        )
+        logging.warning(
+            f"{ctx.author} called the command '{ctx.command}' "
+            "however the command failed to run with the error:"
+            f"-------------\n{error}"
+        )
+        traceback.print_exception(
+            type(error),
+            error,
+            error.__traceback__,
+            file=sys.stderr
+        )
+
+
+def setup(bot):
+    bot.add_cog(CommandErrorHandler(bot))
+    log.debug("CommandErrorHandler cog loaded")