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.

Cleaned up commented out code.

mods/CORE/mcl_oxidization/API.md

@@ -0,0 +1,44 @@
+# Mineclone Oxidization API
+This document explains the API of this mod.
+
+### `register_oxidation_abm(node_name)`
+Registers the ABM for the oxidization of nodes. It expects that the variable
+`_mcl_oxidized_variant` be set with the node name of the oxidized version. 
+
+#### Parameters:
+`node_name`: the name of the node to check, and to oxidize. 
+
+#### Usage:
+To use this API, add `_mcl_oxidized_variant = my_oxidized_node_name,` to the node 
+definition of the desired node, and then call 
+`register_oxidation_abm(my_oxidizable_node_abm, my_oxidizable_node)` in your code.
+This abm will swap out the nodes with the more oxidized version of the node, one 
+stage at a time.
+
+#### Example of Usage:
+From mcl_copper:
+```lua 
+local block_oxidation = {
+    { "", "_exposed" },
+    { "_cut", "_exposed_cut" },
+    { "_exposed", "_weathered" },
+    { "_exposed_cut", "_weathered_cut" },
+    { "_weathered", "_oxidized" },
+    { "_weathered_cut", "_oxidized_cut" }
+}
+
+for _, b in pairs(block_oxidation) do
+    register_oxidation_abm("mcl_copper:block" .. b[1], "mcl_copper:block" .. b[2])
+end
+```
+
+### Oxidization Removal
+Make sure that the Oxidized Node has this in its definition:
+
+`_mcl_stripped_variant = my_less_oxidized_node,`
+
+And axes in mineclone will scrape the oxidization level down, usually by one stage.
+An example of usage: `_mcl_stripped_variant = "mcl_copper:block",`
+
+Implementation of other tools for scraping does not yet exist, but may in the future.
+

mods/CORE/mcl_oxidization/init.lua

@@ -0,0 +1,20 @@
+---
+--- Generated by EmmyLua(https://github.com/EmmyLua)
+--- Created by michieal.
+--- DateTime: 2/15/23 1:11 AM
+---
+
+function register_oxidation_abm(node_name)
+	minetest.register_abm({
+		label = node_name .. "_oxidization_abm",
+		nodenames = { node_name },
+		interval = 500,
+		chance = 3,
+		action = function(pos, node)
+			local def = minetest.registered_nodes[node_name]
+			if def and def._mcl_oxidized_variant then
+				minetest.swap_node(pos, { name = oxidized_variant, param2 = node.param2 })
+			end
+		end,
+	})
+end

mods/CORE/mcl_oxidization/mod.conf

@@ -0,0 +1,4 @@
+title = Oxidization API for Mineclone 2
+name = mcl_oxidization
+author = Michieal, NO11
+description = Turns NO11's oxidization function into an API.

mods/ITEMS/mcl_copper/functions.lua

@@ -1,39 +1,3 @@
---local deepslate_mod = minetest.get_modpath("mcl_deepslate")
-
-local function register_oxidation_abm(abm_name, node_name, oxidized_variant)
-	minetest.register_abm({
-		label = abm_name,
-		nodenames = { node_name },
-		interval = 500,
-		chance = 3,
-		action = function(pos, node)
-			minetest.swap_node(pos, { name = oxidized_variant, param2 = node.param2 })
-		end,
-	})
-end
-
---[[
-local stairs = {
-	{"stair", "exposed", "_inner", "cut_inner"},
-	{"stair", "weathered", "_inner", "exposed_cut_inner"},
-	{"stair", "exposed", "_outer", "cut_outer"},
-	{"stair", "weathered", "_outer", "exposed_cut_outer"},
-	{"stair", "oxidized", "_outer", "weathered_cut_outer"},
-	{"stair", "oxidized", "_inner", "weathered_cut_inner"},
-	{"slab", "exposed", "","cut"},
-	{"slab", "oxidized", "","weathered_cut"},
-	{"slab", "weathered", "","exposed_cut"},
-	{"slab", "exposed", "_top","cut_top"},
-	{"slab", "oxidized", "_top", "weathered_cut_top"},
-	{"slab", "weathered", "_top","exposed_cut_top"},
-	{"slab", "exposed", "_double","cut_double"},
-	{"slab", "oxidized", "_double","weathered_cut_double"},
-	{"slab", "weathered", "_double","exposed_cut_double"},
-	{"stair", "exposed", "","cut"},
-	{"stair", "oxidized", "", "weathered_cut"},
-	{"stair", "weathered", "", "exposed_cut"},
-}]]
-
 local block_oxidation = {
 	{ "", "_exposed" },
 	{ "_cut", "_exposed_cut" },
@@ -43,33 +7,117 @@ local block_oxidation = {
 	{ "_weathered_cut", "_oxidized_cut" }
 }
 
-local stair_oxidation = {
-	{ "slab", "cut", "exposed_cut" },
-	{ "slab", "exposed_cut", "weathered_cut" },
-	{ "slab", "weathered_cut", "oxidized_cut" },
-	{ "slab", "cut_top", "exposed_cut_top" },
-	{ "slab", "exposed_cut_top", "weathered_cut_top" },
-	{ "slab", "weathered_cut_top", "oxidized_cut_double" },
-	{ "slab", "cut_double", "exposed_cut_double" },
-	{ "slab", "exposed_cut_double", "weathered_cut_double" },
-	{ "slab", "weathered_cut_double", "oxidized_cut_double" },
-	{ "stair", "cut", "exposed_cut" },
-	{ "stair", "exposed_cut", "weathered_cut" },
-	{ "stair", "weathered_cut", "oxidized_cut" },
-	{ "stair", "cut_inner", "exposed_cut_inner" },
-	{ "stair", "exposed_cut_inner", "weathered_cut_inner" },
-	{ "stair", "weathered_cut_inner", "oxidized_cut_inner" },
-	{ "stair", "cut_outer", "exposed_cut_outer" },
-	{ "stair", "exposed_cut_outer", "weathered_cut_outer" },
-	{ "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 = {
+	{ "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" },
 }
 
 for _, b in pairs(block_oxidation) do
-	register_oxidation_abm("Copper oxidation", "mcl_copper:block" .. b[1], "mcl_copper:block" .. b[2])
+	register_oxidation_abm("mcl_copper:block" .. b[1])
 end
 
-for _, s in pairs(stair_oxidation) do
-	register_oxidation_abm("Copper oxidation", "mcl_stairs:" .. s[1] .. "_copper_" .. s[2], "mcl_stairs:" .. s[1] .. "_copper_" .. s[3])
-	-- TODO: Make stairs and slabs be waxable / scrapable. Place the Node overrides here, just like they are on the copper nodes, and it will work properly. May need to update mcl_honey to call the waxing function for stairs and slabs.
+local def
+local def_variant_oxidized
+local def_variant_waxed
+local def_variant_scraped
+
+-- register abm, then set up oxidized and waxed variants.
+for i = 1, #stair_oxidization do
+	register_oxidation_abm("mcl_stairs:stair_copper_" .. stair_oxidization[i][1])
+	register_oxidation_abm("mcl_stairs:slab_copper_" .. slab_oxidization[i][1])
+
+	-- 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: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: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_oxidization do
+	-- does both stairs and slabs.
+	if i > 3 then
+		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_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_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_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/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_oxidization
 description = Adds Copper Ore, blocks and items.

mods/ITEMS/mcl_copper/nodes.lua

@@ -34,7 +34,8 @@ minetest.register_node("mcl_copper:block", {
 	sounds = mcl_sounds.node_sound_metal_defaults(),
 	_mcl_blast_resistance = 6,
 	_mcl_hardness = 3,
-	_mcl_copper_waxed_variant = "mcl_copper:waxed_block",
+	_mcl_oxidized_variant = "mcl_copper:block_exposed",
+	_mcl_waxed_variant = "mcl_copper:waxed_block",
 })
 
 minetest.register_node("mcl_copper:waxed_block", {
@@ -58,7 +59,8 @@ minetest.register_node("mcl_copper:block_exposed", {
 	sounds = mcl_sounds.node_sound_metal_defaults(),
 	_mcl_blast_resistance = 6,
 	_mcl_hardness = 5,
-	_mcl_copper_waxed_variant = "mcl_copper:waxed_block_exposed",
+	_mcl_oxidized_variant = "mcl_copper:block_weathered",
+	_mcl_waxed_variant = "mcl_copper:waxed_block_exposed",
 	_mcl_stripped_variant = "mcl_copper:block",
 })
 
@@ -83,7 +85,8 @@ minetest.register_node("mcl_copper:block_weathered", {
 	sounds = mcl_sounds.node_sound_metal_defaults(),
 	_mcl_blast_resistance = 6,
 	_mcl_hardness = 5,
-	_mcl_copper_waxed_variant = "mcl_copper:waxed_block_weathered",
+	_mcl_oxidized_variant = "mcl_copper:block_oxidized",
+	_mcl_waxed_variant = "mcl_copper:waxed_block_weathered",
 	_mcl_stripped_variant = "mcl_copper:block_exposed",
 })
 
@@ -108,7 +111,7 @@ minetest.register_node("mcl_copper:block_oxidized", {
 	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",
 })
 
@@ -133,7 +136,8 @@ minetest.register_node("mcl_copper:block_cut", {
 	sounds = mcl_sounds.node_sound_metal_defaults(),
 	_mcl_blast_resistance = 6,
 	_mcl_hardness = 5,
-	_mcl_copper_waxed_variant = "mcl_copper:waxed_block_cut",
+	_mcl_oxidized_variant = "mcl_copper:block_cut_exposed",
+	_mcl_waxed_variant = "mcl_copper:waxed_block_cut",
 })
 
 minetest.register_node("mcl_copper:waxed_block_cut", {
@@ -157,7 +161,8 @@ 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",
 })
 
@@ -183,7 +188,8 @@ minetest.register_node("mcl_copper:block_weathered_cut", {
 	_mcl_blast_resistance = 6,
 	_mcl_hardness = 5,
 	_mcl_stripped_variant = "mcl_copper:block_exposed_cut",
-	_mcl_copper_waxed_variant = "mcl_copper:waxed_block_weathered_cut",
+	_mcl_oxidized_variant = "mcl_copper:block_cut_oxidized",
+	_mcl_waxed_variant = "mcl_copper:waxed_block_weathered_cut",
 })
 
 minetest.register_node("mcl_copper:waxed_block_weathered_cut", {
@@ -208,7 +214,7 @@ minetest.register_node("mcl_copper:block_oxidized_cut", {
 	_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", {

mods/ITEMS/mcl_honey/init.lua

@@ -16,8 +16,8 @@ function mcl_honey.wax_block(pos, node, player, itemstack)
 
 	local def = minetest.registered_nodes[node.name]
 
-	if def and def._mcl_copper_waxed_variant then
-		node.name = def._mcl_copper_waxed_variant
+	if def and def._mcl_waxed_variant then
+		node.name = def._mcl_waxed_variant
 	end
 
 	minetest.set_node(pos, node)