From 468d4503da91d9f6b86e4386dd89fdf3c5d7d7ac Mon Sep 17 00:00:00 2001
From: AndrejIT <AndrejIT@rambler.ru>
Date: Sun, 21 Dec 2014 19:06:10 +0200
Subject: [PATCH] City boundary do not let lava thorough.

---
 init.lua | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/init.lua b/init.lua
index d7b9bfb..dfe8468 100644
--- a/init.lua
+++ b/init.lua
@@ -47,6 +47,18 @@ function city_block:in_city(pos)
     return false
 end
 
+function city_block:city_boundaries(pos)
+    for i, EachBlock in ipairs(self.blocks) do
+        if (pos.x == (EachBlock.pos.x - 21) or pos.x == (EachBlock.pos.x + 21)) and pos.z > (EachBlock.pos.z - 22) and pos.z < (EachBlock.pos.z + 22 ) then
+            return true
+        end
+        if (pos.z == (EachBlock.pos.z - 21) or pos.z == (EachBlock.pos.z + 21)) and pos.x > (EachBlock.pos.x - 22) and pos.x < (EachBlock.pos.x + 22 ) then
+            return true
+        end
+    end
+    return false
+end
+
 city_block:load()
 
 minetest.register_node("city_block:cityblock", {
@@ -129,3 +141,15 @@ minetest.register_on_dieplayer(
 		end
 	end
 )
+
+--do not let lava flow across boundary of city block
+minetest.register_abm({
+	nodenames = {"default:lava_flowing"},
+	interval = 5,
+	chance = 1,
+	action = function(pos, node, active_object_count, active_object_count_wider)
+        if pos.y>14 and city_block:city_boundaries(pos) then
+            minetest.set_node(pos, {name="default:stone"})
+        end
+	end,
+})
\ No newline at end of file