first commit. snow expands.

.gitignore

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+# Compiled Lua sources
+luac.out
+
+# luarocks build files
+*.src.rock
+*.zip
+*.tar.gz
+
+# Object files
+*.o
+*.os
+*.ko
+*.obj
+*.elf
+
+# Precompiled Headers
+*.gch
+*.pch
+
+# Libraries
+*.lib
+*.a
+*.la
+*.lo
+*.def
+*.exp
+
+# Shared objects (inc. Windows DLLs)
+*.dll
+*.so
+*.so.*
+*.dylib
+
+# Executables
+*.exe
+*.out
+*.app
+*.i*86
+*.x86_64
+*.hex
+

LICENSE.md

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+  DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE 
+                    Version 2, December 2004 
+
+ Copyright (C) 2016 Izzy
+
+ Everyone is permitted to copy and distribute verbatim or modified 
+ copies of this license document, and changing it is allowed as long 
+ as the name is changed. 
+
+            DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE 
+   TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION 
+
+  0. You just DO WHAT THE FUCK YOU WANT TO.

README.md

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+Winter Is Coming
+=========
+
+Snow biomes expand and envelope the entire map. Existing resources are transformed. 
+
+
+
+Copyright 2016 Izzy
+
+WTFPL. Do what the fuck you want.
+

depends.txt

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+default

init.lua

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+
+
+local modpath = minetest.get_modpath("winter_is_coming")
+
+local modname = "winter_is_coming"
+
+
+
+minetest.register_abm({
+	nodenames = { "default:snow" },
+	interval = 1,
+	chance = 5,
+	action = function(pos, node, active_object_count, active_object_count_wider)
+		local n = minetest.find_node_near(pos, 2, {"default:dirt_with_grass"})
+		if n == nil then
+			return
+		end
+		
+		minetest.set_node(n, {name="default:dirt_with_snow"})
+		
+		n.y = n.y + 1
+		local q = minetest.get_node(n)
+		
+		if q == nil then 
+			return
+		end
+		
+		if minetest.get_item_group(q.name, "flora") > 0 then 
+			minetest.set_node(n, {name="default:dry_shrub"})
+		end
+		
+	end,
+})
+
+minetest.register_abm({
+	nodenames = { "default:dirt_with_snow" },
+	interval = 1,
+	chance = 10,
+	action = function(pos, node, active_object_count, active_object_count_wider)
+		local n = minetest.find_node_near(pos, 1, {"default:dirt_with_snow"})
+		if n ~= nil then
+			n.y = n.y + 1
+			local q = minetest.get_node(n)
+			if q ~= nil and (q.name == "air" or q.name == "default:grass") then 
+				minetest.set_node(n, {name="default:snow"})
+			end
+		end
+	end,
+})