From 995024b47bc2c79b272cc6f2d8ab411fbef9a8de Mon Sep 17 00:00:00 2001
From: Nicholas Niro <blowfist@xroutine.net>
Date: Fri, 30 Aug 2019 04:31:14 +0200
Subject: [PATCH] Teach mobs not to jump if they'd hurt their head

---
 mods/ENTITIES/mcl_mobs/api.lua | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/mods/ENTITIES/mcl_mobs/api.lua b/mods/ENTITIES/mcl_mobs/api.lua
index b7a8e22f3..c5cacd923 100644
--- a/mods/ENTITIES/mcl_mobs/api.lua
+++ b/mods/ENTITIES/mcl_mobs/api.lua
@@ -781,6 +781,19 @@ local do_jump = function(self)
 		z = pos.z + dir_z
 	})
 
+	-- this is used to detect if there's a block on top of the block in front of the mob.
+	-- If there is, there is no point in jumping as we won't manage.
+	local nodTop = node_ok({
+		x = pos.x + dir_x,
+		y = pos.y + 1.5,
+		z = pos.z + dir_z
+	})
+
+	-- we don't attempt to jump if there's a stack of blocks blocking
+	if nodTop ~= nil then
+		return false
+	end
+
 	-- thin blocks that do not need to be jumped
 	if nod.name == node_snow then
 		return false