From f287c5a690a78a886b29363634b0cdc2499dafb4 Mon Sep 17 00:00:00 2001
From: Sebastiaan Zeeff <33516116+SebastiaanZ@users.noreply.github.com>
Date: Fri, 13 Sep 2019 21:37:16 +0200
Subject: Fix one-off error in the !clean command

https://github.com/python-discord/bot/issues/413

The message indexing phase of the `!clean` did not account for the
presence of the invocation message, resulting in a one-off error in the
amount of messages being indexed. Fixed it by adding one to the amount
of messages we index from the message history.

Closes #413
---
 bot/cogs/clean.py | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/bot/cogs/clean.py b/bot/cogs/clean.py
index e7b6bac85..1f3e1caa9 100644
--- a/bot/cogs/clean.py
+++ b/bot/cogs/clean.py
@@ -133,7 +133,8 @@ class Clean:
         self.cleaning = True
         invocation_deleted = False
 
-        async for message in ctx.channel.history(limit=amount):
+        # To account for the invocation message, we index `amount + 1` messages.
+        async for message in ctx.channel.history(limit=amount + 1):
 
             # If at any point the cancel command is invoked, we should stop.
             if not self.cleaning:
-- 
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