Default: Create 'grass', 'dry_grass' groups, use in dirt conversion ABM

Author: paramat

mods/default/functions.lua

@@ -362,16 +362,8 @@ minetest.register_abm({
 		"default:dirt_with_grass",
 		"default:dirt_with_dry_grass",
 		"default:dirt_with_snow",
-		"default:grass_1",
-		"default:grass_2",
-		"default:grass_3",
-		"default:grass_4",
-		"default:grass_5",
-		"default:dry_grass_1",
-		"default:dry_grass_2",
-		"default:dry_grass_3",
-		"default:dry_grass_4",
-		"default:dry_grass_5",
+		"group:grass",
+		"group:dry_grass",
 		"default:snow",
 	},
 	interval = 6,
@@ -408,9 +400,9 @@ minetest.register_abm({
 		if name == "default:snow" then
 			minetest.set_node(pos, {name = "default:dirt_with_snow"})
 		-- Most likely case first.
-		elseif name:sub(1, 13) == "default:grass" then
+		elseif minetest.get_item_group(name, "grass") ~= 0 then
 			minetest.set_node(pos, {name = "default:dirt_with_grass"})
-		elseif name:sub(1, 17) == "default:dry_grass" then
+		elseif minetest.get_item_group(name, "dry_grass") ~= 0 then
 			minetest.set_node(pos, {name = "default:dirt_with_dry_grass"})
 		end
 	end

mods/default/nodes.lua

@@ -947,7 +947,7 @@ minetest.register_node("default:junglegrass", {
 	sunlight_propagates = true,
 	walkable = false,
 	buildable_to = true,
-	groups = {snappy = 3, flora = 1, attached_node = 1},
+	groups = {snappy = 3, flora = 1, attached_node = 1, grass = 1},
 	sounds = default.node_sound_leaves_defaults(),
 	selection_box = {
 		type = "fixed",
@@ -968,7 +968,7 @@ minetest.register_node("default:grass_1", {
 	sunlight_propagates = true,
 	walkable = false,
 	buildable_to = true,
-	groups = {snappy = 3, flora = 1, attached_node = 1},
+	groups = {snappy = 3, flora = 1, attached_node = 1, grass = 1},
 	sounds = default.node_sound_leaves_defaults(),
 	selection_box = {
 		type = "fixed",
@@ -998,7 +998,7 @@ for i = 2, 5 do
 		buildable_to = true,
 		drop = "default:grass_1",
 		groups = {snappy = 3, flora = 1, attached_node = 1,
-			not_in_creative_inventory = 1},
+			not_in_creative_inventory = 1, grass = 1},
 		sounds = default.node_sound_leaves_defaults(),
 		selection_box = {
 			type = "fixed",
@@ -1019,7 +1019,8 @@ minetest.register_node("default:dry_grass_1", {
 	sunlight_propagates = true,
 	walkable = false,
 	buildable_to = true,
-	groups = {snappy = 3, flammable = 3, flora = 1, attached_node = 1},
+	groups = {snappy = 3, flammable = 3, flora = 1,
+		attached_node = 1, dry_grass = 1},
 	sounds = default.node_sound_leaves_defaults(),
 	selection_box = {
 		type = "fixed",
@@ -1047,8 +1048,8 @@ for i = 2, 5 do
 		sunlight_propagates = true,
 		walkable = false,
 		buildable_to = true,
-		groups = {snappy = 3, flammable = 3, flora = 1,
-			attached_node = 1, not_in_creative_inventory=1},
+		groups = {snappy = 3, flammable = 3, flora = 1, attached_node = 1,
+			not_in_creative_inventory=1, dry_grass = 1},
 		drop = "default:dry_grass_1",
 		sounds = default.node_sound_leaves_defaults(),
 		selection_box = {