Hmm...  Looks like a unified diff to me...
The text leading up to this was:
--------------------------
|From 5728e3bc46ef38cfcc0f2cbf04626a28ecc57379 Mon Sep 17 00:00:00 2001
|From: Lars Niesen <lars.niesen@gmx.de>
|Date: Thu, 9 Dec 2021 13:40:17 +0100
|Subject: [PATCH] rulerefresher
|
|---
| dwm.c | 50 ++++++++++++++++++++++++++++++++++++++++++++++++++
| 1 file changed, 50 insertions(+)
|
|diff --git a/dwm.c b/dwm.c
|index 4465af1..5f8ba9c 100644
|--- a/dwm.c
|+++ b/dwm.c
--------------------------
Patching file dwm.c using Plan A...
Hunk #1 succeeded at 223.
Hunk #2 succeeded at 1238.
Hunk #3 succeeded at 1994.
Hmm...  Ignoring the trailing garbage.
done