Add grinding recipe for nether lump + refactor grinder recipes (#638)

Maintenance:

* Sort dependency-based entries alphabetically
* Refactor dust registration

Features:

* Add grinding recipe for nether lump and ingot + image for nether dust

technic/machines/register/grinder_recipes.lua

@@ -36,73 +36,73 @@ local recipes = {
 	{"default:ice",              "default:snowblock"},
 }
 
-if minetest.get_modpath("everness") then
-	table.insert(recipes, {"everness:coral_deep_ocean_sandstone_block",          "everness:coral_deep_ocean_sand 2"})
-	table.insert(recipes, {"everness:coral_sandstone",                           "everness:coral_sand 2"})
-	table.insert(recipes, {"everness:coral_white_sandstone",                     "everness:coral_white_sand 2"})
-	table.insert(recipes, {"everness:crystal_forest_deep_ocean_sandstone_block", "everness:crystal_forest_deep_ocean_sand 2"})
-	table.insert(recipes, {"everness:crystal_sandstone",                         "everness:crystal_sand 2"})
-	table.insert(recipes, {"everness:cursed_lands_deep_ocean_sandstone_block",   "everness:cursed_lands_deep_ocean_sand 2"})
-	table.insert(recipes, {"everness:cursed_sandstone_block",                    "everness:cursed_sand 2"})
-	table.insert(recipes, {"everness:mineral_sandstone",                         "everness:mineral_sand 2"})
+local dependent_recipes = {
+	-- Sandstones
+	everness = {
+		{"everness:coral_deep_ocean_sandstone_block",			"everness:coral_deep_ocean_sand 2"},
+		{"everness:coral_sandstone",							"everness:coral_sand 2"},
+		{"everness:coral_white_sandstone",						"everness:coral_white_sand 2"},
+		{"everness:crystal_forest_deep_ocean_sandstone_block",	"everness:crystal_forest_deep_ocean_sand 2"},
+		{"everness:crystal_sandstone",							"everness:crystal_sand 2"},
+		{"everness:cursed_lands_deep_ocean_sandstone_block",	"everness:cursed_lands_deep_ocean_sand 2"},
+		{"everness:cursed_sandstone_block",						"everness:cursed_sand 2"},
+		{"everness:mineral_sandstone",							"everness:mineral_sand 2"},
+	-- Lumps and wheat
+		{"everness:pyrite_lump",	"technic:pyrite_dust 2"},
+	},
+	farming = {
+		{"farming:seed_wheat",		"farming:flour 1"},
+	},
+	gloopores = {
+		{"gloopores:alatro_lump",	"technic:alatro_dust 2"},
+		{"gloopores:kalite_lump",	"technic:kalite_dust 2"},
+		{"gloopores:arol_lump",		"technic:arol_dust 2"},
+		{"gloopores:talinite_lump",	"technic:talinite_dust 2"},
+		{"gloopores:akalin_lump",	"technic:akalin_dust 2"},
+	},
+	homedecor = {
+		{"home_decor:brass_ingot",	"technic:brass_dust 1"},
+	},
+	moreores = {
+		{"moreores:mithril_lump",	"technic:mithril_dust 2"},
+		{"moreores:silver_lump",	"technic:silver_dust 2"},
+	},
+	nether = {
+		{"nether:nether_lump",		"technic:nether_dust 2"},
+	},
+}
+
+for dependency, materials_to_add in pairs(dependent_recipes) do
+	if minetest.get_modpath(dependency) then
+		for _, material_entry in ipairs(materials_to_add) do
+			table.insert(recipes, material_entry)
+		end
+	end
 end
 
 -- defuse the sandstone -> 4 sand recipe to avoid infinite sand bugs (also consult the inverse compressor recipe)
 minetest.clear_craft({
-	recipe = {
-		{"default:sandstone"}
-	},
+	recipe = {{"default:sandstone"}},
 })
 minetest.clear_craft({
-	recipe = {
-		{"default:desert_sandstone"}
-	},
+	recipe = {{"default:desert_sandstone"}},
 })
 minetest.clear_craft({
-	recipe = {
-		{"default:silver_sandstone"}
-	},
+	recipe = {{"default:silver_sandstone"}},
 })
 
 if minetest.get_modpath("everness") then
 	minetest.clear_craft({
-		recipe = {
-			{"everness:mineral_sandstone"}
-		},
+		recipe = {{"everness:mineral_sandstone"}},
 	})
 	-- Currently (2024-03-09), there seem to be no reverse recipes for any of the other everness sandstones.
 end
 
-if minetest.get_modpath("farming") then
-	table.insert(recipes, {"farming:seed_wheat",   "farming:flour 1"})
-end
-
-if minetest.get_modpath("moreores") then
-	table.insert(recipes, {"moreores:mithril_lump",   "technic:mithril_dust 2"})
-	table.insert(recipes, {"moreores:silver_lump",    "technic:silver_dust 2"})
-end
-
-if minetest.get_modpath("gloopores") or minetest.get_modpath("glooptest") then
-	table.insert(recipes, {"gloopores:alatro_lump",   "technic:alatro_dust 2"})
-	table.insert(recipes, {"gloopores:kalite_lump",   "technic:kalite_dust 2"})
-	table.insert(recipes, {"gloopores:arol_lump",     "technic:arol_dust 2"})
-	table.insert(recipes, {"gloopores:talinite_lump", "technic:talinite_dust 2"})
-	table.insert(recipes, {"gloopores:akalin_lump",   "technic:akalin_dust 2"})
-end
-
-if minetest.get_modpath("homedecor") then
-	table.insert(recipes, {"home_decor:brass_ingot", "technic:brass_dust 1"})
-end
-
-if minetest.get_modpath("everness") then
-	table.insert(recipes, {"everness:pyrite_lump",  "technic:pyrite_dust 2"})
-end
-
-for _, data in pairs(recipes) do
+for _, data in ipairs(recipes) do
 	technic.register_grinder_recipe({input = {data[1]}, output = data[2]})
 end
 
--- dusts
+-- Dusts
 local function register_dust(name, ingot)
 	local lname = string.lower(name)
 	lname = string.gsub(lname, ' ', '_')
@@ -120,36 +120,57 @@ local function register_dust(name, ingot)
 	end
 end
 
--- Sorted alphibeticaly
-register_dust("Brass",           "basic_materials:brass_ingot")
-register_dust("Bronze",          "default:bronze_ingot")
-register_dust("Carbon Steel",    "technic:carbon_steel_ingot")
-register_dust("Cast Iron",       "technic:cast_iron_ingot")
-register_dust("Chernobylite",    "technic:chernobylite_block")
-register_dust("Chromium",        "technic:chromium_ingot")
-register_dust("Coal",            nil)
-register_dust("Copper",          "default:copper_ingot")
-register_dust("Lead",            "technic:lead_ingot")
-register_dust("Gold",            "default:gold_ingot")
-register_dust("Mithril",         "moreores:mithril_ingot")
-register_dust("Silver",          "moreores:silver_ingot")
-register_dust("Stainless Steel", "technic:stainless_steel_ingot")
-register_dust("Stone",           "default:stone")
-register_dust("Sulfur",          nil)
-register_dust("Tin",             "default:tin_ingot")
-register_dust("Wrought Iron",    "technic:wrought_iron_ingot")
-register_dust("Zinc",            "technic:zinc_ingot")
-if minetest.get_modpath("gloopores") or minetest.get_modpath("glooptest") then
-	register_dust("Akalin",          "glooptest:akalin_ingot")
-	register_dust("Alatro",          "glooptest:alatro_ingot")
-	register_dust("Arol",            "glooptest:arol_ingot")
-	register_dust("Kalite",          nil)
-	register_dust("Talinite",        "glooptest:talinite_ingot")
-end
-if minetest.get_modpath("everness") then
-	register_dust("Pyrite",          "everness:pyrite_ingot")
+-- Sorted alphabetically
+local dusts = {
+	{"Brass",           "basic_materials:brass_ingot"},
+	{"Bronze",          "default:bronze_ingot"},
+	{"Carbon Steel",    "technic:carbon_steel_ingot"},
+	{"Cast Iron",       "technic:cast_iron_ingot"},
+	{"Chernobylite",    "technic:chernobylite_block"},
+	{"Chromium",        "technic:chromium_ingot"},
+	{"Coal",            nil},
+	{"Copper",          "default:copper_ingot"},
+	{"Lead",            "technic:lead_ingot"},
+	{"Gold",            "default:gold_ingot"},
+	{"Mithril",         "moreores:mithril_ingot"},
+	{"Silver",          "moreores:silver_ingot"},
+	{"Stainless Steel", "technic:stainless_steel_ingot"},
+	{"Stone",           "default:stone"},
+	{"Sulfur",          nil},
+	{"Tin",             "default:tin_ingot"},
+	{"Wrought Iron",    "technic:wrought_iron_ingot"},
+	{"Zinc",            "technic:zinc_ingot"},
+}
+
+local dependent_dusts = {
+	everness = {
+		{"Pyrite",          "everness:pyrite_ingot"},
+	},
+	gloopores = {
+		{"Akalin",          "glooptest:akalin_ingot"},
+		{"Alatro",          "glooptest:alatro_ingot"},
+		{"Arol",            "glooptest:arol_ingot"},
+		{"Kalite",          nil},
+		{"Talinite",        "glooptest:talinite_ingot"},
+	},
+	nether = {
+		{"Nether",          "nether:nether_ingot"},
+	},
+}
+
+for dependency, dusts_to_add in pairs(dependent_dusts) do
+	if minetest.get_modpath(dependency) then
+		for _, dust_entry in pairs(dusts_to_add) do
+			table.insert(dusts, dust_entry)
+		end
+	end
 end
 
+for _, data in ipairs(dusts) do
+	register_dust(data[1], data[2])
+end
+
+-- Uranium
 for p = 0, 35 do
 	local nici = (p ~= 0 and p ~= 7 and p ~= 35) and 1 or nil
 	local psuffix = p == 7 and "" or p
@@ -185,6 +206,7 @@ for pa = 0, 34 do
 	end
 end
 
+-- Fuels
 minetest.register_craft({
 	type = "fuel",
 	recipe = "technic:coal_dust",