Did what I should have done to begin with: changed _mcl_copper_waxed_variant to _mcl_waxed_variant so that it intuitively applies to more than just copper.

mods/ITEMS/mcl_copper/functions.lua

@@ -1,25 +1,25 @@
-local stair_oxidation = {
-	{ "stair", "cut", "exposed_cut" },
-	{ "stair", "cut_inner", "exposed_cut_inner" },
-	{ "stair", "cut_outer", "exposed_cut_outer" },
-	{ "stair", "exposed_cut", "weathered_cut" },
-	{ "stair", "exposed_cut_inner", "weathered_cut_inner" },
-	{ "stair", "exposed_cut_outer", "weathered_cut_outer" },
-	{ "stair", "weathered_cut", "oxidized_cut" },
-	{ "stair", "weathered_cut_inner", "oxidized_cut_inner" },
-	{ "stair", "weathered_cut_outer", "oxidized_cut_outer" }
+local stair_oxidization = {
+	{ "cut", "exposed_cut" },
+	{ "cut_inner", "exposed_cut_inner" },
+	{ "cut_outer", "exposed_cut_outer" },
+	{ "exposed_cut", "weathered_cut" },
+	{ "exposed_cut_inner", "weathered_cut_inner" },
+	{ "exposed_cut_outer", "weathered_cut_outer" },
+	{ "weathered_cut", "oxidized_cut" },
+	{ "weathered_cut_inner", "oxidized_cut_inner" },
+	{ "weathered_cut_outer", "oxidized_cut_outer" }
 }
 
 local slab_oxidization = {
-	{ "slab", "cut", "exposed_cut" },
-	{ "slab", "cut_top", "exposed_cut_top" },
-	{ "slab", "cut_double", "exposed_cut_double" },
-	{ "slab", "exposed_cut", "weathered_cut" },
-	{ "slab", "exposed_cut_top", "weathered_cut_top" },
-	{ "slab", "exposed_cut_double", "weathered_cut_double" },
-	{ "slab", "weathered_cut", "oxidized_cut" },
-	{ "slab", "weathered_cut_top", "oxidized_cut_double" },
-	{ "slab", "weathered_cut_double", "oxidized_cut_double" },
+	{ "cut", "exposed_cut" },
+	{ "cut_top", "exposed_cut_top" },
+	{ "cut_double", "exposed_cut_double" },
+	{ "exposed_cut", "weathered_cut" },
+	{ "exposed_cut_top", "weathered_cut_top" },
+	{ "exposed_cut_double", "weathered_cut_double" },
+	{ "weathered_cut", "oxidized_cut" },
+	{ "weathered_cut_top", "oxidized_cut_double" },
+	{ "weathered_cut_double", "oxidized_cut_double" },
 }
 
 local def
@@ -27,39 +27,82 @@ local def_variant_oxidized
 local def_variant_waxed
 local def_variant_scraped
 
--- register abm, then set up oxidized and waxed variants.
-for _, s in pairs(stair_oxidation) do
-	def = "mcl_stairs:" .. s[1] .. "_copper_" .. s[2]
-	def_variant_oxidized = "mcl_stairs:" .. s[1] .. "_copper_" .. s[3]
+-- set up oxidized and waxed variants.
+for i = 1, #stair_oxidization do
+	-- stairs
+	def = "mcl_stairs:stair_copper_" .. stair_oxidization[i][1]
+	def_variant_oxidized = "mcl_stairs:stair_copper_" .. stair_oxidization[i][2]
 	minetest.override_item(def, { _mcl_oxidized_variant = def_variant_oxidized })
 
-	def_variant_waxed = "mcl_stairs:" .. s[1] .. "_copper_" .. s[2] .. "_waxed"
-	minetest.override_item(def, { _mcl_copper_waxed_variant = def_variant_waxed })
-	def = "mcl_stairs:" .. s[1] .. "_copper_" .. s[2]
-	def_variant_oxidized = "mcl_stairs:" .. s[1] .. "_copper_" .. s[3]
+	def_variant_waxed = "mcl_stairs:stair_waxed_copper_" .. stair_oxidization[i][2]
+	minetest.override_item(def, { _mcl_waxed_variant = def_variant_waxed })
+
+	-- slabs
+	def = "mcl_stairs:slab_copper_" .. slab_oxidization[i][1]
+	def_variant_oxidized = "mcl_stairs:slab_copper_" .. slab_oxidization[i][2]
 	minetest.override_item(def, { _mcl_oxidized_variant = def_variant_oxidized })
 
-	def_variant_waxed = "mcl_stairs:" .. s[1] .. "_copper_" .. s[2] .. "_waxed"
-	minetest.override_item(def, { _mcl_copper_waxed_variant = def_variant_waxed })
+	def_variant_waxed = "mcl_stairs:slab_waxed_copper_" .. slab_oxidization[i][1]
+	minetest.override_item(def, { _mcl_waxed_variant = def_variant_waxed })
 end
 
 -- Set up scraped variants.
-for i=1, #stair_oxidation do
+for i = 1, #stair_oxidization do
+	-- does both stairs and slabs.
 	if i > 3 then
-		def = "mcl_stairs:" .. stair_oxidation[i][1] .. "_copper_" .. stair_oxidation[i][2]
-		def_variant_scraped="mcl_stairs:" .. stair_oxidation[i-3][1] .. "_copper_" .. stair_oxidation[i-3][2]
+		def = "mcl_stairs:stair_copper_" .. stair_oxidization[i][1]
+		def_variant_scraped = "mcl_stairs:stair_copper_" .. stair_oxidization[i - 3][1]
 		minetest.override_item(def, { _mcl_stripped_variant = def_variant_scraped })
-		def = "mcl_stairs:" .. slab_oxidization[i][1] .. "_copper_" .. slab_oxidization[i][2]
-		def_variant_scraped="mcl_stairs:" .. slab_oxidization[i-3][1] .. "_copper_" .. slab_oxidization[i-3][2]
+
+		def = "mcl_stairs:slab_copper_" .. slab_oxidization[i][1]
+		def_variant_scraped = "mcl_stairs:slab_copper_" .. slab_oxidization[i - 3][1]
 		minetest.override_item(def, { _mcl_stripped_variant = def_variant_scraped })
 	end
-	if i>6 then
-		def = "mcl_stairs:" .. stair_oxidation[i][1] .. "_copper_" .. stair_oxidation[i][3]
-		def_variant_scraped="mcl_stairs:" .. stair_oxidation[i][1] .. "_copper_" .. stair_oxidation[i][2]
+	if i > 6 then
+		def = "mcl_stairs:stair_copper_" .. stair_oxidization[i][2]
+		def_variant_scraped = "mcl_stairs:stair_copper_" .. stair_oxidization[i][1]
 		minetest.override_item(def, { _mcl_stripped_variant = def_variant_scraped })
-		def = "mcl_stairs:" .. slab_oxidization[i][1] .. "_copper_" .. slab_oxidization[i][3]
-		def_variant_scraped="mcl_stairs:" .. slab_oxidization[i][1] .. "_copper_" .. slab_oxidization[i][2]
+
+		def = "mcl_stairs:slab_copper_" .. slab_oxidization[i][2]
+		def_variant_scraped = "mcl_stairs:slab_copper_" .. slab_oxidization[i][1]
 		minetest.override_item(def, { _mcl_stripped_variant = def_variant_scraped })
 	end
 end
 
+-- Set up scraped variants for waxed stairs.
+local waxed_variants = {
+	{ "waxed_copper_cut", "copper_cut" },
+	{ "waxed_copper_exposed_cut", "copper_exposed_cut" },
+	{ "waxed_copper_weathered_cut", "copper_weathered_cut" },
+	{ "waxed_copper_oxidized_cut", "copper_oxidized_cut" },
+}
+
+for i = 1, #waxed_variants do
+	-- stairs
+	def = "mcl_stairs:stair_" .. waxed_variants[i][1]
+	def_variant_scraped = "mcl_stairs:stair_" .. waxed_variants[i][2]
+	minetest.override_item(def, { _mcl_stripped_variant = def_variant_scraped })
+
+	def = "mcl_stairs:stair_" .. waxed_variants[i][1] .. "_inner"
+	def_variant_scraped = "mcl_stairs:stair_" .. waxed_variants[i][2] .. "_inner"
+	minetest.override_item(def, { _mcl_stripped_variant = def_variant_scraped })
+
+	def = "mcl_stairs:stair_" .. waxed_variants[i][1] .. "_outer"
+	def_variant_scraped = "mcl_stairs:stair_" .. waxed_variants[i][2] .. "_outer"
+	minetest.override_item(def, { _mcl_stripped_variant = def_variant_scraped })
+
+	-- slab
+	def = "mcl_stairs:slab_" .. waxed_variants[i][1]
+	def_variant_scraped = "mcl_stairs:slab_" .. waxed_variants[i][2]
+	minetest.override_item(def, { _mcl_stripped_variant = def_variant_scraped })
+
+	def = "mcl_stairs:slab_" .. waxed_variants[i][1] .. "_top"
+	def_variant_scraped = "mcl_stairs:slab_" .. waxed_variants[i][2] .. "_top"
+	minetest.override_item(def, { _mcl_stripped_variant = def_variant_scraped })
+
+	def = "mcl_stairs:slab_" .. waxed_variants[i][1] .. "_double"
+	def_variant_scraped = "mcl_stairs:slab_" .. waxed_variants[i][2] .. "_double"
+	minetest.override_item(def, { _mcl_stripped_variant = def_variant_scraped })
+
+end
+

mods/ITEMS/mcl_copper/init.lua

@@ -2,7 +2,7 @@ local path = minetest.get_modpath("mcl_copper")
 
 mcl_copper = {} -- initialize global variable.
 
-dofile(path .. "/functions.lua")
 dofile(path .. "/nodes.lua")
 dofile(path .. "/items.lua")
 dofile(path .. "/crafting.lua")
+dofile(path .. "/functions.lua")

mods/ITEMS/mcl_copper/mod.conf

@@ -1,4 +1,4 @@
 name = mcl_copper
 author = NO11
-depends = mcl_core, mcl_sounds, mcl_stairs, mcl_util
+depends = mcl_core, mcl_sounds, mcl_stairs, mcl_util, mcl_oxidation
 description = Adds Copper Ore, blocks and items.

mods/ITEMS/mcl_copper/nodes.lua

@@ -35,7 +35,7 @@ minetest.register_node("mcl_copper:block", {
 	_mcl_blast_resistance = 6,
 	_mcl_hardness = 3,
 	_mcl_oxidized_variant = "mcl_copper:block_exposed",
-	_mcl_copper_waxed_variant = "mcl_copper:waxed_block",
+	_mcl_waxed_variant = "mcl_copper:waxed_block",
 })
 
 minetest.register_node("mcl_copper:waxed_block", {
@@ -60,7 +60,7 @@ minetest.register_node("mcl_copper:block_exposed", {
 	_mcl_blast_resistance = 6,
 	_mcl_hardness = 5,
 	_mcl_oxidized_variant = "mcl_copper:block_weathered",
-	_mcl_copper_waxed_variant = "mcl_copper:waxed_block_exposed",
+	_mcl_waxed_variant = "mcl_copper:waxed_block_exposed",
 	_mcl_stripped_variant = "mcl_copper:block",
 })
 
@@ -86,7 +86,7 @@ minetest.register_node("mcl_copper:block_weathered", {
 	_mcl_blast_resistance = 6,
 	_mcl_hardness = 5,
 	_mcl_oxidized_variant = "mcl_copper:block_oxidized",
-	_mcl_copper_waxed_variant = "mcl_copper:waxed_block_weathered",
+	_mcl_waxed_variant = "mcl_copper:waxed_block_weathered",
 	_mcl_stripped_variant = "mcl_copper:block_exposed",
 })
 
@@ -107,11 +107,11 @@ minetest.register_node("mcl_copper:block_oxidized", {
 	_doc_items_longdesc = S("Oxidized copper is a decorative block."),
 	tiles = {"mcl_copper_oxidized.png"},
 	is_ground_content = false,
-	groups = {pickaxey = 2, building_block = 1, oxidizable = 1},
+	groups = {pickaxey = 2, building_block = 1},
 	sounds = mcl_sounds.node_sound_metal_defaults(),
 	_mcl_blast_resistance = 6,
 	_mcl_hardness = 5,
-	_mcl_copper_waxed_variant = "mcl_copper:waxed_block_oxidized",
+	_mcl_waxed_variant = "mcl_copper:waxed_block_oxidized",
 	_mcl_stripped_variant = "mcl_copper:block_weathered",
 })
 
@@ -137,7 +137,7 @@ minetest.register_node("mcl_copper:block_cut", {
 	_mcl_blast_resistance = 6,
 	_mcl_hardness = 5,
 	_mcl_oxidized_variant = "mcl_copper:block_cut_exposed",
-	_mcl_copper_waxed_variant = "mcl_copper:waxed_block_cut",
+	_mcl_waxed_variant = "mcl_copper:waxed_block_cut",
 })
 
 minetest.register_node("mcl_copper:waxed_block_cut", {
@@ -161,7 +161,7 @@ minetest.register_node("mcl_copper:block_exposed_cut", {
 	sounds = mcl_sounds.node_sound_metal_defaults(),
 	_mcl_blast_resistance = 6,
 	_mcl_hardness = 5,
-	_mcl_copper_waxed_variant = "mcl_copper:waxed_block_exposed_cut",
+	_mcl_waxed_variant = "mcl_copper:waxed_block_exposed_cut",
 	_mcl_oxidized_variant = "mcl_copper:block_cut_weathered",
 	_mcl_stripped_variant = "mcl_copper:block_cut",
 })
@@ -189,7 +189,7 @@ minetest.register_node("mcl_copper:block_weathered_cut", {
 	_mcl_hardness = 5,
 	_mcl_stripped_variant = "mcl_copper:block_exposed_cut",
 	_mcl_oxidized_variant = "mcl_copper:block_cut_oxidized",
-	_mcl_copper_waxed_variant = "mcl_copper:waxed_block_weathered_cut",
+	_mcl_waxed_variant = "mcl_copper:waxed_block_weathered_cut",
 })
 
 minetest.register_node("mcl_copper:waxed_block_weathered_cut", {
@@ -209,12 +209,12 @@ minetest.register_node("mcl_copper:block_oxidized_cut", {
 	_doc_items_longdesc = S("Oxidized cut copper is a decorative block."),
 	tiles = {"mcl_copper_oxidized_cut.png"},
 	is_ground_content = false,
-	groups = {pickaxey = 2, building_block = 1, oxidizable = 1},
+	groups = {pickaxey = 2, building_block = 1},
 	sounds = mcl_sounds.node_sound_metal_defaults(),
 	_mcl_blast_resistance = 6,
 	_mcl_hardness = 5,
 	_mcl_stripped_variant = "mcl_copper:block_weathered_cut",
-	_mcl_copper_waxed_variant = "mcl_copper:waxed_block_oxidized_cut",
+	_mcl_waxed_variant = "mcl_copper:waxed_block_oxidized_cut",
 })
 
 minetest.register_node("mcl_copper:waxed_block_oxidized_cut", {
@@ -272,7 +272,7 @@ mcl_stairs.register_slab("waxed_copper_weathered_cut", "mcl_copper:waxed_block_w
 	S("Waxed Double Slab of Weathered Cut Copper"))
 
 mcl_stairs.register_slab("copper_oxidized_cut", "mcl_copper:block_oxidized_cut",
-	{pickaxey = 2, oxidizable = 1},
+	{pickaxey = 2},
 	{"mcl_copper_oxidized_cut.png", "mcl_copper_oxidized_cut.png", "mcl_copper_oxidized_cut.png"},
 	S("Slab of Oxidized Cut Copper"),
 	nil, nil, nil,
@@ -328,7 +328,7 @@ mcl_stairs.register_stair("waxed_copper_weathered_cut", "mcl_copper:waxed_block_
 	"woodlike")
 
 mcl_stairs.register_stair("copper_oxidized_cut", "mcl_copper:block_oxidized_cut",
-	{pickaxey = 2, oxidizable = 1},
+	{pickaxey = 2},
 	{"mcl_copper_oxidized_cut.png", "mcl_copper_oxidized_cut.png", "mcl_copper_oxidized_cut.png", "mcl_copper_oxidized_cut.png", "mcl_copper_oxidized_cut.png", "mcl_copper_oxidized_cut.png"},
 	S("Stairs of Oxidized Cut Copper"),
 	nil, 6, nil,

mods/ITEMS/mcl_honey/init.lua

@@ -16,7 +16,9 @@ function mcl_honey.wax_block(pos, node, player, itemstack)
 
 	local def = minetest.registered_nodes[node.name]
 
-	if not def or not def._mcl_copper_waxed_variant then
+	if def and def._mcl_waxed_variant then
+		node.name = def._mcl_waxed_variant
+	else
 		return
 	end