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LICENSE.md

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+License of source code
+----------------------
+
+The MIT License (MIT)
+Copyright (C) 2021 StarNinjas
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of this
+software and associated documentation files (the "Software"), to deal in the Software
+without restriction, including without limitation the rights to use, copy, modify, merge,
+publish, distribute, sublicense, and/or sell copies of the Software, and to permit
+persons to whom the Software is furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all copies or
+substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
+INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
+PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE
+FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
+OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+DEALINGS IN THE SOFTWARE.
+
+For more details:
+https://opensource.org/licenses/MIT
+
+
+Licenses of media (textures)
+----------------------------
+
+Attribution-ShareAlike 3.0 Unported (CC BY-SA 3.0)
+Copyright (C) 2021 StarNinjas
+
+You are free to:
+Share — copy and redistribute the material in any medium or format.
+Adapt — remix, transform, and build upon the material for any purpose, even commercially.
+The licensor cannot revoke these freedoms as long as you follow the license terms.
+
+Under the following terms:
+
+Attribution — You must give appropriate credit, provide a link to the license, and
+indicate if changes were made. You may do so in any reasonable manner, but not in any way
+that suggests the licensor endorses you or your use.
+
+ShareAlike — If you remix, transform, or build upon the material, you must distribute
+your contributions under the same license as the original.
+
+No additional restrictions — You may not apply legal terms or technological measures that
+legally restrict others from doing anything the license permits.
+
+Notices:
+
+You do not have to comply with the license for elements of the material in the public
+domain or where your use is permitted by an applicable exception or limitation.
+No warranties are given. The license may not give you all of the permissions necessary
+for your intended use. For example, other rights such as publicity, privacy, or moral
+rights may limit how you use the material.
+
+For more details:
+http://creativecommons.org/licenses/by-sa/3.0/

README.md

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+Version 1.0
+
+In real life, both copper and bronze will slowly "oxidize" when exposed to oxygen.
+This process is sped up by other substances, among them is water.
+So, with this mod, when copper or bronze touches water it will slowly turn into "Oxidized Block".
+You can also craft "Oxidized Block" by mixing copper or bronze block with a water bucket.

depends.txt

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+default
+stairs?
+bucket?

init.lua

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+
+--
+-- Oxidized Blocks
+--
+
+minetest.register_node("xcopper:oxidizedblock", {
+	description = ("Oxidized Block"),
+	tiles = {"xcopper_oxidized_block.png"},
+	is_ground_content = false,
+	groups = {cracky = 1, level = 2},
+	sounds = default.node_sound_metal_defaults(),
+})
+
+-- Stairs
+
+if minetest.get_modpath("stairs") then
+
+stairs.register_stair(
+	"oxidized",
+	"xcopper:oxidizedblock",
+	{cracky = 1, level = 2},
+	{"xcopper_oxidized_block.png"},
+	"Oxidized Stair",
+	default.node_sound_metal_defaults(),
+	false
+)
+
+stairs.register_slab(
+	"oxidized",
+	"xcopper:oxidizedblock",
+	{cracky = 1, level = 2},
+	{"xcopper_oxidized_block.png"},
+	"Oxidized Slab",
+	default.node_sound_metal_defaults(),
+	false
+)
+
+stairs.register_stair_inner(
+	"oxidized",
+	"xcopper:oxidizedblock",
+	{cracky = 1, level = 2},
+	{"xcopper_oxidized_block.png"},
+	"Oxidized Inner Stair",
+	default.node_sound_metal_defaults(),
+	false
+)
+
+stairs.register_stair_outer(
+	"oxidized",
+	"xcopper:oxidizedblock",
+	{cracky = 1, level = 2},
+	{"xcopper_oxidized_block.png"},
+	"Oxidized Outer Stair",
+	default.node_sound_metal_defaults(),
+	false
+)
+end
+
+-- Make Copper and Bronze have the group "oxidizes"
+
+minetest.override_item("default:bronzeblock", {
+	description = ("Bronze Block"),
+	tiles = {"default_bronze_block.png"},
+	is_ground_content = false,
+	groups = {cracky = 1, level = 2, oxidizes=3},
+	sounds = default.node_sound_metal_defaults(),
+})
+
+minetest.override_item("default:copperblock", {
+	description = ("Copper Block"),
+	tiles = {"default_copper_block.png"},
+	is_ground_content = false,
+	groups = {cracky = 1, level = 2, oxidizes=3},
+	sounds = default.node_sound_metal_defaults(),
+})
+
+--
+-- Oxidation ABM
+--
+
+local oxide_correspondences = {
+	["default:copperblock"] = "xcopper:oxidizedblock",
+	["default:bronzeblock"] = "xcopper:oxidizedblock",
+	["stairs:stair_copperblock"] = "stairs:stair_oxidized",
+	["stairs:slab_copperblock"] = "stairs:slab_oxidized",
+	["stairs:stair_inner_copperblock"] = "stairs:stair_inner_oxidized",
+	["stairs:stair_outer_copperblock"] = "stairs:stair_outer_oxidized",
+	["stairs:stair_bronzeblock"] = "stairs:stair_oxidized",
+	["stairs:slab_bronzelock"] = "stairs:slab_oxidized",
+	["stairs:stair_inner_bronzeblock"] = "stairs:stair_inner_oxidized",
+	["stairs:stair_outer_bronzeblock"] = "stairs:stair_outer_oxidized",
+}
+
+minetest.register_abm({
+	label = "Oxidation",
+	nodenames = {"group:oxidizes"},
+	neighbors = {"group:water"},
+	interval = 20,
+	chance = 150,
+	catch_up = false,
+	action = function(pos, node)
+		node.name = oxide_correspondences[node.name]
+		if node.name then
+			minetest.set_node(pos, node)
+		end
+	end
+})
+
+-- You can craft Oxidized Block too
+
+if minetest.get_modpath("bucket") then
+
+minetest.register_craft({
+	type = "shapeless",
+	output = "default:oxidizedblock",
+	recipe = {
+		"group:oxidizes","bucket:bucket_water"
+	},
+	replacements = { {"bucket:bucket_water", "bucket:bucket_empty"} }
+})
+
+end