Hmm...  Looks like a unified diff to me...
The text leading up to this was:
--------------------------
|From f86f23588bd96803137e65a0ef7a8dcc285e4583 Mon Sep 17 00:00:00 2001
|From: v4hn <me@v4hn.de>
|Date: Thu, 4 Feb 2021 14:12:34 +0100
|Subject: [PATCH 1/2] introduce locktagsfor functionality
|
|To reduce procrastination and focus on individual tasks in workflows
|where multiple projects are open in disjoint tag sets, this patch
|enables users to lock their currently selected tags for some duration
|and force them to focus on what is currently shown on their screen.
|
|The patch retains all WM functionality that does not change tags,
|especially multi-monitor setups and layout changes.
|
|Of course the patch does not support you at all if you procrastinate
|away from your computer or just open new unrelated windows.
|Forbidding the latter would be much harder and too restrictive
|from the perspective of the patch author.
|
|To use this patch add a shortcut to your config.h.
|E.g., to lock tags for 300 seconds via MOD+F1, add
|
|+   { MODKEY,                       XK_F1,     locktagsfor,    {.ui = 300 } },
|---
| dwm.c | 38 ++++++++++++++++++++++++++++++++++++--
| 1 file changed, 36 insertions(+), 2 deletions(-)
|
|diff --git a/dwm.c b/dwm.c
|index 137a10f..3da1c1a 100644
|--- a/dwm.c
|+++ b/dwm.c
--------------------------
Patching file dwm.c using Plan A...
Hunk #1 succeeded at 27.
Hunk #2 succeeded at 179 (offset 21 lines).
Hunk #3 succeeded at 247 with fuzz 1 (offset -1 lines).
Hunk #4 succeeded at 726 (offset -67 lines).
Hunk #5 succeeded at 1109 (offset -12 lines).
Hunk #6 succeeded at 1686 (offset -82 lines).
Hunk #7 succeeded at 1828 (offset -12 lines).
Hunk #8 succeeded at 1776 with fuzz 2 (offset -83 lines).
Hunk #9 succeeded at 2151 with fuzz 2 (offset -32 lines).
Hmm...  Ignoring the trailing garbage.
done