Hmm...  Looks like a unified diff to me...
The text leading up to this was:
--------------------------
|From d57c8508c9f26be40667d402a2daaa2b27ae759f Mon Sep 17 00:00:00 2001
|From: explosion-mental <explosion0mental@gmail.com>
|Date: Wed, 11 Aug 2021 21:05:44 -0500
|Subject: [PATCH] shift-tools - shifttag, moves the current selected client to
| the adjacent tag - shifttagclients, moves the current selected client to the
| adjacent tag   that has at least one client else acts as shifttag -
| shiftview, view adjacent tag - shiftviewclients, view the closes tag that has
| a client. If none acts   as shiftview - shiftboth, shifttag and shiftview.
| Basically moves the window to the   next/prev tag and follows it. -
| shiftswaptags, its a shift implementation on the swaptags function   (see  
| https://github.com/moizifty/DWM-Build/blob/65379c62640788881486401a0d8c79333751b02f/config.h#L48
|   for more details), which in short 'swaps tags' (swaps all clients with  
| the clients on the adjacent tag). A pretty useful example of this is  
| chosing a tag empty and sending all your clients to that tag. - swapfunction
| is the 'helper' function for the shiftswaptags. remember that these functions
| **shift**, which means you can go from tag 1 to 9 or 9 to 1. Also remember
| that the default argument is 1 and you   can change it.
|
|---
| config.def.h  |   9 ++++
| shift-tools.c | 135 ++++++++++++++++++++++++++++++++++++++++++++++++++
| 2 files changed, 144 insertions(+)
| create mode 100644 shift-tools.c
|
|diff --git a/config.def.h b/config.def.h
|index 1c0b587..1390d17 100644
|--- a/config.def.h
|+++ b/config.def.h
--------------------------
Patching file config.def.h using Plan A...
Hunk #1 succeeded at 58.
Hunk #2 succeeded at 74.
Hmm...  The next patch looks like a unified diff to me...
The text leading up to this was:
--------------------------
|diff --git a/shift-tools.c b/shift-tools.c
|new file mode 100644
|index 0000000..cf130c8
|--- /dev/null
|+++ b/shift-tools.c
--------------------------
(Creating file shift-tools.c...)
Patching file shift-tools.c using Plan A...
Empty context always matches.
Hunk #1 succeeded at 1.
Hmm...  Ignoring the trailing garbage.
done