minetest_game/mods/dye/init.lua

-- Other mods can use these for looping through available colors

dye = {}
dye.basecolors = {"white", "grey", "black", "red", "yellow", "green", "cyan", "blue", "magenta"}
dye.excolors = {"white", "lightgrey", "grey", "darkgrey", "black", "red", "orange", "yellow",
	"lime", "green", "aqua", "cyan", "sky_blue", "blue", "violet", "magenta", "red_violet"}

-- Make dye names and descriptions available globally

dye.dyes = {
	{"white",      "White"},
	{"grey",       "Grey"},
	{"dark_grey",  "Dark grey"},
	{"black",      "Black"},
	{"violet",     "Violet"},
	{"blue",       "Blue"},
	{"cyan",       "Cyan"},
	{"dark_green", "Dark green"},
	{"green",      "Green"},
	{"yellow",     "Yellow"},
	{"brown",      "Brown"},
	{"orange",     "Orange"},
	{"red",        "Red"},
	{"magenta",    "Magenta"},
	{"pink",       "Pink"},
}

-- This collection of colors is partly a historic thing, partly something else

local dyes = {
	{"white",      "White dye",      {dye=1, basecolor_white=1,   excolor_white=1,      unicolor_white=1}},
	{"grey",       "Grey dye",       {dye=1, basecolor_grey=1,    excolor_grey=1,       unicolor_grey=1}},
	{"dark_grey",  "Dark grey dye",  {dye=1, basecolor_grey=1,    excolor_darkgrey=1,   unicolor_darkgrey=1}},
	{"black",      "Black dye",      {dye=1, basecolor_black=1,   excolor_black=1,      unicolor_black=1}},
	{"violet",     "Violet dye",     {dye=1, basecolor_magenta=1, excolor_violet=1,     unicolor_violet=1}},
	{"blue",       "Blue dye",       {dye=1, basecolor_blue=1,    excolor_blue=1,       unicolor_blue=1}},
	{"cyan",       "Cyan dye",       {dye=1, basecolor_cyan=1,    excolor_cyan=1,       unicolor_cyan=1}},
	{"dark_green", "Dark green dye", {dye=1, basecolor_green=1,   excolor_green=1,      unicolor_dark_green=1}},
	{"green",      "Green dye",      {dye=1, basecolor_green=1,   excolor_green=1,      unicolor_green=1}},
	{"yellow",     "Yellow dye",     {dye=1, basecolor_yellow=1,  excolor_yellow=1,     unicolor_yellow=1}},
	{"brown",      "Brown dye",      {dye=1, basecolor_brown=1,   excolor_orange=1,     unicolor_dark_orange=1}},
	{"orange",     "Orange dye",     {dye=1, basecolor_orange=1,  excolor_orange=1,     unicolor_orange=1}},
	{"red",        "Red dye",        {dye=1, basecolor_red=1,     excolor_red=1,        unicolor_red=1}},
	{"magenta",    "Magenta dye",    {dye=1, basecolor_magenta=1, excolor_red_violet=1, unicolor_red_violet=1}},
	{"pink",       "Pink dye",       {dye=1, basecolor_red=1,     excolor_red=1,        unicolor_light_red=1}},
}

-- Define items

for _, row in ipairs(dyes) do
	local name = row[1]
	local description = row[2]
	local groups = row[3]
	local item_name = "dye:" .. name
	local item_image = "dye_" .. name .. ".png"
	minetest.register_craftitem(item_name, {
		inventory_image = item_image,
		description = description,
		groups = groups
	})
	minetest.register_craft({
		type = "shapeless",
		output = item_name .. " 4",
		recipe = {"group:flower,color_" .. name},
	})
end

-- Manually add coal->black dye

minetest.register_craft({
	type = "shapeless",
	output = "dye:black 4",
	recipe = {"group:coal"},
})

-- Mix recipes
-- Just mix everything to everything somehow sanely

local mixbases = {"pink", "magenta", "red", "orange", "brown", "yellow", "green", "dark_green", "cyan", "blue", "violet", "black", "dark_grey", "grey", "white"}

local mixes = {
	--             pink,     magenta,  red,      orange,      brown,       yellow,      green,       dark_green,  cyan,   blue,    violet,  black,      dark_grey,  grey,  white
	white      = {"pink",   "pink",   "pink",   "orange",    "orange",    "yellow",    "green",     "green",     "grey", "cyan",  "violet","grey",     "grey",     "grey","white"},
	grey       = {"pink",   "pink",   "pink",   "orange",    "orange",    "yellow",    "green",     "green",     "grey", "cyan",  "violet","dark_grey","grey",     "grey"},
	dark_grey  = {"brown",  "brown",  "brown",  "brown",     "brown",     "brown",     "dark_green","dark_green","blue", "blue",  "violet","black",    "dark_grey"},
	black      = {"black",  "black",  "black",  "black",     "black",     "black",     "black",     "black",     "black","black", "black", "black"},
	violet     = {"magenta","magenta","magenta","red",       "brown",     "red",       "cyan",      "brown",     "blue", "violet","violet"},
	blue       = {"violet", "violet", "magenta","brown",     "brown",     "dark_green","cyan",      "cyan",      "cyan", "blue"},
	cyan       = {"brown",  "blue",   "brown",  "dark_green","dark_grey", "green",     "cyan",      "dark_green","cyan"},
	dark_green = {"brown",  "brown",  "brown",  "brown",     "brown",     "green",     "green",     "dark_green"},
	green      = {"yellow", "brown",  "yellow", "yellow",    "dark_green","green",     "green"},
	yellow     = {"orange", "red",    "orange", "yellow",    "orange",    "yellow"},
	brown      = {"brown",  "brown",  "brown",  "orange",    "brown"},
	orange     = {"orange", "red",    "orange", "orange"},
	red        = {"pink",   "magenta","red"},
	magenta    = {"magenta","magenta"},
	pink       = {"pink"},
}

for one, results in pairs(mixes) do
	for i, result in ipairs(results) do
		local another = mixbases[i]
		minetest.register_craft({
			type = "shapeless",
			output = 'dye:' .. result .. ' 2',
			recipe = {'dye:' .. one, 'dye:' .. another},
		})
	end
end