Grass block: Change grass color depending on biome

mods/ITEMS/mcl_core/functions.lua

@@ -639,6 +639,23 @@ end
 
 local grass_spread_randomizer = PseudoRandom(minetest.get_mapgen_setting("seed"))
 
+-- Return appropriate grass block node for pos. Dry grass for dry/hot biomes, normal grass otherwise.
+function mcl_core.get_grass_block_type(pos)
+	local biome_data = minetest.get_biome_data(pos)
+	local dry = false
+	if biome_data then
+		local biome = biome_data.biome
+		local biome_name = minetest.get_biome_name(biome)
+		local biome_type = minetest.registered_biomes[biome_name]._mcl_biome_type
+		dry = biome_type == "hot"
+	end
+	if dry then
+		return {name="mcl_core:dirt_with_dry_grass"}
+	else
+		return {name="mcl_core:dirt_with_grass"}
+	end
+end
+
 ------------------------------
 -- Spread grass blocks and mycelium on neighbor dirt
 ------------------------------
@@ -681,6 +698,9 @@ minetest.register_abm({
 		if light_self >= 4 and light_source >= 9 then
 			-- All checks passed! Let's spread the grass/mycelium!
 			local n2 = minetest.get_node(p2)
+			if minetest.get_item_group(n2.name, "grass_block") ~= 0 then
+				n2 = mcl_core.get_grass_block_type(pos)
+			end
 			minetest.set_node(pos, {name=n2.name})
 
 			-- If this was mycelium, uproot plant above

mods/ITEMS/mcl_core/nodes_base.lua

@@ -321,18 +321,9 @@ minetest.register_node("mcl_core:dirt_with_grass", {
 		footstep = {name="default_grass_footstep", gain=0.4},
 	}),
 	on_construct = function(pos)
-		local dim = mcl_worlds.pos_to_dimension(pos)
-		local dry
-		if dim == "nether" then
-			dry = true
-		else
-			local found_node = minetest.find_node_near(pos, 1, {"mcl_core:dirt_with_dry_grass", "mcl_core:dirt_with_dry_grass_snow"})
-			if found_node then
-				dry = true
-			end
-		end
-		if dry then
-			minetest.set_node(pos, {name="mcl_core:dirt_with_dry_grass"})
+		local new_node = mcl_core.get_grass_block_type(pos)
+		if new_node.name ~= "mcl_core:dirt_with_grass" then
+			minetest.set_node(pos, new_node)
 		end
 		return mcl_core.on_snowable_construct(pos)
 	end,