Hmm...  Looks like a unified diff to me...
The text leading up to this was:
--------------------------
|URL: http://dwm.suckless.org/patches/push
|pushup and pushdown provide a way to move clients inside the clients list.
|
|Index: dwm/push.c
|===================================================================
|--- /dev/null	1970-01-01 00:00:00.000000000 +0000
|+++ dwm/push.c	2014-02-09 15:24:21.652117230 +0100
--------------------------
(Creating file push.c...)
Patching file push.c using Plan A...
Empty context always matches.
Hunk #1 succeeded at 1.
done