DigWorks/mods/ITEMS/mcl_banners/patterncraft.lua

-- List of patterns with crafting rules

local d = "%D" -- dye
local e = "" -- empty slot (one of them must contain the banner)
local patterns = {
	["border"] = {
		{ d, d, d },
		{ d, e, d },
		{ d, d, d },
	},
	["bricks"] = {
		type = "shapeless",
		{ "mcl_core:brick_block", d },
	},
	["circle"] = {
		{ e, e, e },
		{ e, d, e },
		{ e, e, e },
	},
	["creeper"] = {
		type = "shapeless",
		{ "mcl_heads:creeper", d },
	},
	["cross"] = {
		{ d, e, d },
		{ e, d, e },
		{ d, e, d },
	},
	["curly_border"] = {
		type = "shapless",
		{ "mcl_core:vine", d },
	},
	["diagonal_left"] = {
		{ e, e, e },
		{ d, e, e },
		{ d, d, e },
	},
	["diagonal_right"] = {
		{ e, e, e },
		{ e, e, d },
		{ e, d, d },
	},
	["diagonal_up_left"] = {
		{ e, d, d },
		{ e, e, d },
		{ e, e, e },
	},
	["diagonal_up_right"] = {
		{ d, d, e },
		{ d, e, e },
		{ e, e, e },
	},
	["flower"] = {
		type = "shapeless",
		{ "mcl_flowers:oxeye_daisy", d },
	},
	["gradient"] = {
		{ d, e, d },
		{ e, d, e },
		{ e, d, e },
	},
	["gradient_up"] = {
		{ e, d, e },
		{ e, d, e },
		{ d, e, d },
	},
	["half_horizontal_bottom"] = {
		{ e, e, e },
		{ d, d, d },
		{ d, d, d },
	},
	["half_horizontal"] = {
		{ d, d, d },
		{ d, d, d },
		{ e, e, e },
	},
	["half_vertical"] = {
		{ d, d, e },
		{ d, d, e },
		{ d, d, e },
	},
	["half_vertical_right"] = {
		{ e, d, d },
		{ e, d, d },
		{ e, d, d },
	},
	["thing"] = {
		type = "shapeless",
		{ "mcl_core:apple_gold", d },
	},
	["rhombus"] = {
		{ e, d, e },
		{ d, e, d },
		{ e, d, e },
	},
	["skull"] = {
		type = "shapeless",
		{ "mcl_heads:wither_skeleton", d },
	},
	["small_stripes"] = {
		{ d, e, d },
		{ d, e, d },
		{ e, e, e },
	},
	["square_bottom_left"] = {
		{ e, e, e },
		{ e, e, e },
		{ d, e, e },
	},
	["square_bottom_right"] = {
		{ e, e, e },
		{ e, e, e },
		{ e, e, d },
	},
	["square_top_left"] = {
		{ d, e, e },
		{ e, e, e },
		{ e, e, e },
	},
	["square_top_right"] = {
		{ e, e, d },
		{ e, e, e },
		{ e, e, e },
	},
	["straight_cross"] = {
		{ e, d, e },
		{ d, d, d },
		{ e, d, e },
	},
	["stripe_bottom"] = {
		{ e, e, e },
		{ e, e, e },
		{ d, d, d },
	},
	["stripe_center"] = {
		{ e, e, e },
		{ d, d, d },
		{ e, e, e },
	},
	["stripe_downleft"] = {
		{ e, e, d },
		{ e, d, e },
		{ d, e, e },
	},
	["stripe_downright"] = {
		{ d, e, e },
		{ e, d, e },
		{ e, e, d },
	},
	["stripe_left"] = {
		{ d, e, e },
		{ d, e, e },
		{ d, e, e },
	},
	["stripe_middle"] = {
		{ e, d, e },
		{ e, d, e },
		{ e, d, e },
	},
	["stripe_right"] = {
		{ e, e, d },
		{ e, e, d },
		{ e, e, d },
	},
	["stripe_top"] = {
		{ d, d, d },
		{ e, e, e },
		{ e, e, e },
	},
	["triangle_bottom"] = {
		{ e, e, e },
		{ e, d, e },
		{ d, e, d },
	},
	["triangles_bottom"] = {
		{ e, e, e },
		{ d, e, d },
		{ e, d, e },
	},
	["triangles_top"] = {
		{ e, d, e },
		{ d, e, d },
		{ e, e, e },
	},
	["triangle_top"] = {
		{ d, e, d },
		{ e, d, e },
		{ e, e, e },
	},
}

minetest.register_craft_predict(function(itemstack, player, old_craft_grid, craft_inv)
	if minetest.get_item_group(itemstack:get_name(), "banner") ~= 1 then
		return
	end

	local original
	local index
	for i = 1, player:get_inventory():get_size("craft") do
		if minetest.get_item_group(old_craft_grid[i]:get_name(), "banner") == 1 then
			original = old_craft_grid[i]
			index = i
		end
	end
	if not original then
		return
	end

	local imeta = itemstack:get_meta()

	imeta:set_string("description", "Emblazoned Banner")
	return itemstack
end)


minetest.register_on_craft(function(itemstack, player, old_craft_grid, craft_inv)
	if minetest.get_item_group(itemstack:get_name(), "banner") ~= 1 then
		return
	end

	local original
	local index
	for i = 1, player:get_inventory():get_size("craft") do
		local itemname = old_craft_grid[i]:get_name()
		if minetest.get_item_group(itemname, "banner") == 1 then
			original = old_craft_grid[i]
			index = i
		end
	end
	if not original then
		return
	end

	local ometa = original:get_meta()
	local layers_raw = ometa:get_string("layers")
	local layers = minetest.deserialize(layers_raw)
	if type(layers) ~= "table" then
		layers = {}
	end

	table.insert(layers, {pattern="circle", color = "unicolor_yellow"})

	local imeta = itemstack:get_meta()
	imeta:set_string("layers", minetest.serialize(layers))

	imeta:set_string("description", "Emblazoned Banner")
	return itemstack
end)

-- Register crafting recipes for all the patterns
for pattern_name, pattern in pairs(patterns) do
	if pattern.type == nil then
		for colorid, colortab in pairs(mcl_banners.colors) do
			local banner = "mcl_banners:banner_item_"..colortab[1]
			local bannered = false
			local recipe = {}
			for row_id=1, #pattern do
				local row = pattern[row_id]
				local newrow = {}
				for r=1, #row do
					if row[r] == d then
						newrow[r] = "group:dye"
					elseif row[r] == e and not bannered then
						newrow[r] = banner
						bannered = true
					else
						newrow[r] = row[r]
					end
				end
				table.insert(recipe, newrow)
			end
			minetest.register_craft({
				output = "mcl_banners:banner_item_"..colortab[1],
				recipe = recipe,
			})
		end
	elseif pattern.type == "shapeless" then
		-- TODO
	end
end