Wool mod with autocolor

init.lua

-- This uses a trick: you can first define the recipes using all of the base
-- colors, and then some recipes using more specific colors for a few non-base
-- colors available. When crafting, the last recipes will be checked first.

local dyes = {
	{"white",      "White",      "basecolor_white"},
	{"grey",       "Grey",       "basecolor_grey"},
	{"black",      "Black",      "basecolor_black"},
	{"red",        "Red",        "basecolor_red"},
	{"yellow",     "Yellow",     "basecolor_yellow"},
	{"green",      "Green",      "basecolor_green"},
	{"cyan",       "Cyan",       "basecolor_cyan"},
	{"blue",       "Blue",       "basecolor_blue"},
	{"magenta",    "Magenta",    "basecolor_magenta"},
	{"orange",     "Orange",     "excolor_orange"},
	{"violet",     "Violet",     "excolor_violet"},
	{"brown",      "Brown",      "unicolor_dark_orange"},
	{"pink",       "Pink",       "unicolor_light_red"},
	{"dark_grey",  "Dark Grey",  "unicolor_darkgrey"},
	{"dark_green", "Dark Green", "unicolor_dark_green"},
}

minetest.register_node("wool:block", {
	description = "Wool",
	tiles = {"wool_block.png"},
	paramtype2 = "color",
	palette = "wool_palette.png",
	is_ground_content = false,
	groups = {snappy = 2, choppy = 2, oddly_breakable_by_hand = 3,
			flammable = 3, wool = 1},
	sounds = default.node_sound_defaults(),
})


minetest.register_craft({
	output = "wool:block",
	type = "shapeless",
	recipe = {
		"wool:block",
		"group:dye",
	},
})

minetest.register_on_craft(function(itemstack, player, old_craft_grid, craft_inv)
	if itemstack:get_name() ~= "wool:block" then
		return
	end

	local index = false
	local dye
	-- find dye color
	for i = 1, player:get_inventory():get_size("craft") do
		if old_craft_grid[i]:get_name():find("dye:") then
			index = i
			dye = old_craft_grid[i]:get_name():gsub("dye:", "")
		end
	end
	if not index then
		return
	end

	local cindex = false
	for k, v in ipairs(dyes) do
		if dye == v[1] then
			cindex = k
		end
	end
	if not cindex then
		return
	end

	-- replace output with dyed itemstack
	local meta = itemstack:get_meta()
	meta:set_int("palette_index", cindex - 1)
	-- do not add description, it would disappear when placing the node
	-- meta:set_string("description", dyes[cindex][2] .. " wool")

	return itemstack
end)



-- legacy

-- Backwards compatibility with jordach's 16-color wool mod
minetest.register_alias("wool:dark_blue", "wool:blue")
minetest.register_alias("wool:gold", "wool:yellow")