From 96c7e0aa8be4db5b3d543363511e2ea557d76aa2 Mon Sep 17 00:00:00 2001
From: Milan2018 <pasekmilan2003@gmail.com>
Date: Sun, 16 May 2021 13:51:22 +0200
Subject: [PATCH] update

---
 unified_inventory/.luacheckrc            |   1 +
 unified_inventory/README.md              |   4 +-
 unified_inventory/api.lua                | 122 ++--
 unified_inventory/bags.lua               |  84 +--
 unified_inventory/callbacks.lua          |  38 ++
 unified_inventory/category.lua           | 149 +++++
 unified_inventory/default-categories.lua | 704 +++++++++++++++++++++++
 unified_inventory/init.lua               | 118 +++-
 unified_inventory/internal.lua           | 345 ++++++-----
 unified_inventory/mod.conf               |   4 +-
 unified_inventory/register.lua           | 261 +++++----
 unified_inventory/settingtypes.txt       |   3 +
 unified_inventory/waypoints.lua          | 127 ++--
 13 files changed, 1518 insertions(+), 442 deletions(-)
 create mode 100644 unified_inventory/category.lua
 create mode 100644 unified_inventory/default-categories.lua

diff --git a/unified_inventory/.luacheckrc b/unified_inventory/.luacheckrc
index 9fb6a7c..e6fec97 100644
--- a/unified_inventory/.luacheckrc
+++ b/unified_inventory/.luacheckrc
@@ -14,6 +14,7 @@ read_globals = {
 	"ItemStack", "datastorage",
 
 	"hb",
+	"doors",
 }
 
 files["callbacks.lua"].ignore = { "player", "draw_lite_mode" }
diff --git a/unified_inventory/README.md b/unified_inventory/README.md
index 8c917ec..d159c02 100644
--- a/unified_inventory/README.md
+++ b/unified_inventory/README.md
@@ -24,7 +24,7 @@ Unified Inventory replaces the default survival and creative inventory.
 
 ## Requirements
 
- * Minetest 5.0.0+
+ * Minetest 5.4.0+
 
 # Licenses
 
@@ -96,4 +96,4 @@ Other files from Wikimedia Commons:
 
 RealBadAngel: (CC-BY-4.0)
 
-  * Everything else.
\ No newline at end of file
+  * Everything else.
diff --git a/unified_inventory/api.lua b/unified_inventory/api.lua
index 81dd8f3..22788ae 100644
--- a/unified_inventory/api.lua
+++ b/unified_inventory/api.lua
@@ -1,5 +1,6 @@
 local S = minetest.get_translator("unified_inventory")
 local F = minetest.formspec_escape
+local ui = unified_inventory
 
 -- Create detached creative inventory after loading all mods
 minetest.after(0.01, function()
@@ -8,12 +9,12 @@ minetest.after(0.01, function()
 		if not rev_aliases[target] then rev_aliases[target] = {} end
 		table.insert(rev_aliases[target], source)
 	end
-	unified_inventory.items_list = {}
+	ui.items_list = {}
 	for name, def in pairs(minetest.registered_items) do
 		if (not def.groups.not_in_creative_inventory or
 		   def.groups.not_in_creative_inventory == 0) and
 		   def.description and def.description ~= "" then
-			table.insert(unified_inventory.items_list, name)
+			table.insert(ui.items_list, name)
 			local all_names = rev_aliases[name] or {}
 			table.insert(all_names, name)
 			for _, player_name in ipairs(all_names) do
@@ -26,30 +27,30 @@ minetest.after(0.01, function()
 						for _,chk in pairs(recipe.items) do
 							local groupchk = string.find(chk, "group:")
 							if (not groupchk and not minetest.registered_items[chk])
-							  or (groupchk and not unified_inventory.get_group_item(string.gsub(chk, "group:", "")).item)
+							  or (groupchk and not ui.get_group_item(string.gsub(chk, "group:", "")).item)
 							  or minetest.get_item_group(chk, "not_in_craft_guide") ~= 0 then
 								unknowns = true
 							end
 						end
 
 						if not unknowns then
-							unified_inventory.register_craft(recipe)
+							ui.register_craft(recipe)
 						end
 					end
 				end
 			end
 		end
 	end
-	table.sort(unified_inventory.items_list)
-	unified_inventory.items_list_size = #unified_inventory.items_list
-	print("Unified Inventory. inventory size: "..unified_inventory.items_list_size)
-	for _, name in ipairs(unified_inventory.items_list) do
+	table.sort(ui.items_list)
+	ui.items_list_size = #ui.items_list
+	print("Unified Inventory. inventory size: "..ui.items_list_size)
+	for _, name in ipairs(ui.items_list) do
 		local def = minetest.registered_items[name]
 		-- Simple drops
 		if type(def.drop) == "string" then
 			local dstack = ItemStack(def.drop)
 			if not dstack:is_empty() and dstack:get_name() ~= name then
-				unified_inventory.register_craft({
+				ui.register_craft({
 					type = "digging",
 					items = {name},
 					output = def.drop,
@@ -115,7 +116,7 @@ minetest.after(0.01, function()
 				end
 			end
 			for itemstring, count in pairs(drop_guaranteed) do
-				unified_inventory.register_craft({
+				ui.register_craft({
 					type = "digging",
 					items = {name},
 					output = itemstring .. " " .. count,
@@ -123,7 +124,7 @@ minetest.after(0.01, function()
 				})
 			end
 			for itemstring, count in pairs(drop_maybe) do
-				unified_inventory.register_craft({
+				ui.register_craft({
 					type = "digging_chance",
 					items = {name},
 					output = itemstring .. " " .. count,
@@ -132,22 +133,22 @@ minetest.after(0.01, function()
 			end
 		end
 	end
-	for _, recipes in pairs(unified_inventory.crafts_for.recipe) do
+	for _, recipes in pairs(ui.crafts_for.recipe) do
 		for _, recipe in ipairs(recipes) do
 			local ingredient_items = {}
 			for _, spec in pairs(recipe.items) do
-				local matches_spec = unified_inventory.canonical_item_spec_matcher(spec)
-				for _, name in ipairs(unified_inventory.items_list) do
+				local matches_spec = ui.canonical_item_spec_matcher(spec)
+				for _, name in ipairs(ui.items_list) do
 					if matches_spec(name) then
 						ingredient_items[name] = true
 					end
 				end
 			end
 			for name, _ in pairs(ingredient_items) do
-				if unified_inventory.crafts_for.usage[name] == nil then
-					unified_inventory.crafts_for.usage[name] = {}
+				if ui.crafts_for.usage[name] == nil then
+					ui.crafts_for.usage[name] = {}
 				end
-				table.insert(unified_inventory.crafts_for.usage[name], recipe)
+				table.insert(ui.crafts_for.usage[name], recipe)
 			end
 		end
 	end
@@ -156,9 +157,9 @@ end)
 
 -- load_home
 local function load_home()
-	local input = io.open(unified_inventory.home_filename, "r")
+	local input = io.open(ui.home_filename, "r")
 	if not input then
-		unified_inventory.home_pos = {}
+		ui.home_pos = {}
 		return
 	end
 	while true do
@@ -167,25 +168,31 @@ local function load_home()
 		local y = input:read("*n")
 		local z = input:read("*n")
 		local name = input:read("*l")
-		unified_inventory.home_pos[name:sub(2)] = {x = x, y = y, z = z}
+		ui.home_pos[name:sub(2)] = {x = x, y = y, z = z}
 	end
 	io.close(input)
 end
 load_home()
 
-function unified_inventory.set_home(player, pos)
+function ui.set_home(player, pos)
 	local player_name = player:get_player_name()
-	unified_inventory.home_pos[player_name] = vector.round(pos)
+	ui.home_pos[player_name] = vector.round(pos)
+
 	-- save the home data from the table to the file
-	local output = io.open(unified_inventory.home_filename, "w")
-	for k, v in pairs(unified_inventory.home_pos) do
+	local output = io.open(ui.home_filename, "w")
+	if not output then
+		minetest.log("warning", "[unified_inventory] Failed to save file: "
+			.. ui.home_filename)
+		return
+	end
+	for k, v in pairs(ui.home_pos) do
 		output:write(v.x.." "..v.y.." "..v.z.." "..k.."\n")
 	end
 	io.close(output)
 end
 
-function unified_inventory.go_home(player)
-	local pos = unified_inventory.home_pos[player:get_player_name()]
+function ui.go_home(player)
+	local pos = ui.home_pos[player:get_player_name()]
 	if pos then
 		player:set_pos(pos)
 		return true
@@ -194,7 +201,7 @@ function unified_inventory.go_home(player)
 end
 
 -- register_craft
-function unified_inventory.register_craft(options)
+function ui.register_craft(options)
 	if not options.output then
 		return
 	end
@@ -205,10 +212,10 @@ function unified_inventory.register_craft(options)
 	if options.type == "normal" and options.width == 0 then
 		options = { type = "shapeless", items = options.items, output = options.output, width = 0 }
 	end
-	if not unified_inventory.crafts_for.recipe[itemstack:get_name()] then
-		unified_inventory.crafts_for.recipe[itemstack:get_name()] = {}
+	if not ui.crafts_for.recipe[itemstack:get_name()] then
+		ui.crafts_for.recipe[itemstack:get_name()] = {}
 	end
-	table.insert(unified_inventory.crafts_for.recipe[itemstack:get_name()],options)
+	table.insert(ui.crafts_for.recipe[itemstack:get_name()],options)
 end
 
 
@@ -219,7 +226,7 @@ local craft_type_defaults = {
 }
 
 
-function unified_inventory.craft_type_defaults(name, options)
+function ui.craft_type_defaults(name, options)
 	if not options.description then
 		options.description = name
 	end
@@ -228,13 +235,13 @@ function unified_inventory.craft_type_defaults(name, options)
 end
 
 
-function unified_inventory.register_craft_type(name, options)
-	unified_inventory.registered_craft_types[name] =
-			unified_inventory.craft_type_defaults(name, options)
+function ui.register_craft_type(name, options)
+	ui.registered_craft_types[name] =
+			ui.craft_type_defaults(name, options)
 end
 
 
-unified_inventory.register_craft_type("normal", {
+ui.register_craft_type("normal", {
 	description = F(S("Crafting")),
 	icon = "ui_craftgrid_icon.png",
 	width = 3,
@@ -250,7 +257,7 @@ unified_inventory.register_craft_type("normal", {
 })
 
 
-unified_inventory.register_craft_type("shapeless", {
+ui.register_craft_type("shapeless", {
 	description = F(S("Mixing")),
 	icon = "ui_craftgrid_icon.png",
 	width = 3,
@@ -265,7 +272,7 @@ unified_inventory.register_craft_type("shapeless", {
 })
 
 
-unified_inventory.register_craft_type("cooking", {
+ui.register_craft_type("cooking", {
 	description = F(S("Cooking")),
 	icon = "default_furnace_front.png",
 	width = 1,
@@ -273,37 +280,60 @@ unified_inventory.register_craft_type("cooking", {
 })
 
 
-unified_inventory.register_craft_type("digging", {
+ui.register_craft_type("digging", {
 	description = F(S("Digging")),
 	icon = "default_tool_steelpick.png",
 	width = 1,
 	height = 1,
 })
 
-unified_inventory.register_craft_type("digging_chance", {
+ui.register_craft_type("digging_chance", {
 	description = "Digging (by chance)",
 	icon = "default_tool_steelpick.png^[transformFY.png",
 	width = 1,
 	height = 1,
 })
 
-function unified_inventory.register_page(name, def)
-	unified_inventory.pages[name] = def
+function ui.register_page(name, def)
+	ui.pages[name] = def
 end
 
 
-function unified_inventory.register_button(name, def)
+function ui.register_button(name, def)
 	if not def.action then
 		def.action = function(player)
-			unified_inventory.set_inventory_formspec(player, name)
+			ui.set_inventory_formspec(player, name)
 		end
 	end
 	def.name = name
-	table.insert(unified_inventory.buttons, def)
+	table.insert(ui.buttons, def)
 end
 
-
-function unified_inventory.is_creative(playername)
+function ui.is_creative(playername)
 	return minetest.check_player_privs(playername, {creative=true})
 		or minetest.settings:get_bool("creative_mode")
 end
+
+function ui.single_slot(xpos, ypos, bright)
+	return string.format("background9[%f,%f;%f,%f;ui_single_slot%s.png;false;16]",
+	xpos, ypos, ui.imgscale, ui.imgscale, (bright and "_bright" or "") )
+end
+
+function ui.make_trash_slot(xpos, ypos)
+	return
+		ui.single_slot(xpos, ypos)..
+		"image["..xpos..","..ypos..";1.25,1.25;ui_trash_slot_icon.png]"..
+		"list[detached:trash;main;"..(xpos + ui.list_img_offset)..","..(ypos + ui.list_img_offset)..";1,1;]"
+end
+
+function ui.make_inv_img_grid(xpos, ypos, width, height, bright)
+	local tiled = {}
+	local n=1
+	for y = 0, (height - 1) do
+		for x = 0, (width -1) do
+			tiled[n] = ui.single_slot(xpos + (ui.imgscale * x), ypos + (ui.imgscale * y), bright)
+			n = n + 1
+		end
+	end
+	return table.concat(tiled)
+end
diff --git a/unified_inventory/bags.lua b/unified_inventory/bags.lua
index bcaa520..14ac875 100644
--- a/unified_inventory/bags.lua
+++ b/unified_inventory/bags.lua
@@ -7,29 +7,32 @@ License: GPLv3
 
 local S = minetest.get_translator("unified_inventory")
 local F = minetest.formspec_escape
-local bags_inv_bg_prefix = "image[-0.1,1.0;10.05,"
+local ui = unified_inventory
 
-unified_inventory.register_page("bags", {
+ui.register_page("bags", {
 	get_formspec = function(player)
 		local player_name = player:get_player_name()
 		return { formspec = table.concat({
-			string.gsub(unified_inventory.standard_inv_bg, "YYY", "4.4"),
-			bags_inv_bg_prefix.."1.175;ui_bags_header.png]",
-			"label[0,0;" .. F(S("Bags")) .. "]",
-			"button[0,2.2;2,0.5;bag1;" .. F(S("Bag @1", 1)) .. "]",
-			"button[2,2.2;2,0.5;bag2;" .. F(S("Bag @1", 2)) .. "]",
-			"button[4,2.2;2,0.5;bag3;" .. F(S("Bag @1", 3)) .. "]",
-			"button[6,2.2;2,0.5;bag4;" .. F(S("Bag @1", 4)) .. "]",
+			ui.style_full.standard_inv_bg,
+			ui.single_slot(0.925, 1.5),
+			ui.single_slot(3.425, 1.5),
+			ui.single_slot(5.925, 1.5),
+			ui.single_slot(8.425, 1.5),
+			"label["..ui.style_full.form_header_x..","..ui.style_full.form_header_y..";" .. F(S("Bags")) .. "]",
+			"button[0.6125,2.75;1.875,0.75;bag1;" .. F(S("Bag @1", 1)) .. "]",
+			"button[3.1125,2.75;1.875,0.75;bag2;" .. F(S("Bag @1", 2)) .. "]",
+			"button[5.6125,2.75;1.875,0.75;bag3;" .. F(S("Bag @1", 3)) .. "]",
+			"button[8.1125,2.75;1.875,0.75;bag4;" .. F(S("Bag @1", 4)) .. "]",
 			"listcolors[#00000000;#00000000]",
-			"list[detached:" .. F(player_name) .. "_bags;bag1;0.5,1.1;1,1;]",
-			"list[detached:" .. F(player_name) .. "_bags;bag2;2.5,1.1;1,1;]",
-			"list[detached:" .. F(player_name) .. "_bags;bag3;4.5,1.1;1,1;]",
-			"list[detached:" .. F(player_name) .. "_bags;bag4;6.5,1.1;1,1;]"
+			"list[detached:" .. F(player_name) .. "_bags;bag1;1.075,1.65;1,1;]",
+			"list[detached:" .. F(player_name) .. "_bags;bag2;3.575,1.65;1,1;]",
+			"list[detached:" .. F(player_name) .. "_bags;bag3;6.075,1.65;1,1;]",
+			"list[detached:" .. F(player_name) .. "_bags;bag4;8.575,1.65;1,1;]"
 		}) }
 	end,
 })
 
-unified_inventory.register_button("bags", {
+ui.register_button("bags", {
 	type = "image",
 	image = "ui_bags_icon.png",
 	tooltip = S("Bags"),
@@ -44,33 +47,31 @@ local function get_player_bag_stack(player, i)
 end
 
 for bag_i = 1, 4 do
-	unified_inventory.register_page("bag" .. bag_i, {
+	ui.register_page("bag" .. bag_i, {
 		get_formspec = function(player)
 			local stack = get_player_bag_stack(player, bag_i)
 			local image = stack:get_definition().inventory_image
-			local fs = {
-				string.gsub(unified_inventory.standard_inv_bg, "YYY", "4.4"),
-				"image[7,0;1,1;" .. image .. "]",
-				"label[0,0;" .. F(S("Bag @1", bag_i)) .. "]",
-				"listcolors[#00000000;#00000000]",
-				"list[current_player;bag" .. bag_i .. "contents;0,1.1;8,3;]",
-				"listring[current_name;bag" .. bag_i .. "contents]",
-				"listring[current_player;main]",
-			}
 			local slots = stack:get_definition().groups.bagslots
-			if slots == 8 then
-					fs[#fs + 1] = bags_inv_bg_prefix.."1.175;ui_bags_inv_small.png]"
-			elseif slots == 16 then
-					fs[#fs + 1] = bags_inv_bg_prefix.."2.35;ui_bags_inv_medium.png]"
-			elseif slots == 24 then
-					fs[#fs + 1] = bags_inv_bg_prefix.."3.525;ui_bags_inv_large.png]"
-			end
+
+			local formspec = {
+				ui.style_full.standard_inv_bg,
+				ui.make_inv_img_grid(0.3, 1.5, 8, slots/8),
+				"image[9.2,0.4;1,1;" .. image .. "]",
+				"label[0.3,0.65;" .. F(S("Bag @1", bag_i)) .. "]",
+				"listcolors[#00000000;#00000000]",
+				"listring[current_player;main]",
+				string.format("list[current_player;bag%icontents;%f,%f;8,3;]",
+				    bag_i, 0.3 + ui.list_img_offset, 1.5 + ui.list_img_offset),
+				"listring[current_name;bag" .. bag_i .. "contents]",
+			}
+			local n = #formspec + 1
+
 			local player_name = player:get_player_name() -- For if statement.
-			if unified_inventory.trash_enabled
-					or unified_inventory.is_creative(player_name)
-					or minetest.get_player_privs(player_name).give then
-				fs[#fs + 1] = "image[5.91,-0.06;1.21,1.15;ui_bags_trash.png]"
-						.. "list[detached:trash;main;6,0.1;1,1;]"
+			if ui.trash_enabled
+				or ui.is_creative(player_name)
+				or minetest.get_player_privs(player_name).give then
+					formspec[n] = ui.make_trash_slot(7.8, 0.25)
+					n = n + 1
 			end
 			local inv = player:get_inventory()
 			for i = 1, 4 do
@@ -87,11 +88,12 @@ for bag_i = 1, 4 do
 					end
 					local img = def.inventory_image
 					local label = F(S("Bag @1", i)) .. "\n" .. used .. "/" .. size
-					fs[#fs + 1] = string.format("image_button[%i,0;1,1;%s;bag%i;%s]",
-							i + 1, img, i, label)
+					formspec[n] = string.format("image_button[%f,0.4;1,1;%s;bag%i;%s]",
+							(i + 1.35)*1.25, img, i, label)
+					n = n + 1
 				end
 			end
-			return { formspec = table.concat(fs) }
+			return { formspec = table.concat(formspec) }
 		end,
 	})
 end
@@ -106,7 +108,7 @@ minetest.register_on_player_receive_fields(function(player, formname, fields)
 			if not stack:get_definition().groups.bagslots then
 				return
 			end
-			unified_inventory.set_inventory_formspec(player, "bag" .. i)
+			ui.set_inventory_formspec(player, "bag" .. i)
 			return
 		end
 	end
@@ -135,7 +137,7 @@ end
 local function load_bags_metadata(player, bags_inv)
 	local player_inv = player:get_inventory()
 	local meta = player:get_meta()
-	local bags_meta = meta:get_string("unified_inventory:bags")
+	local bags_meta = meta:get("unified_inventory:bags")
 	local bags = bags_meta and minetest.deserialize(bags_meta) or {}
 	local dirty_meta = false
 	if not bags_meta then
diff --git a/unified_inventory/callbacks.lua b/unified_inventory/callbacks.lua
index bc90237..1f43e39 100644
--- a/unified_inventory/callbacks.lua
+++ b/unified_inventory/callbacks.lua
@@ -19,6 +19,8 @@ minetest.register_on_joinplayer(function(player)
 	unified_inventory.active_search_direction[player_name] = "nochange"
 	unified_inventory.apply_filter(player, "", "nochange")
 	unified_inventory.current_searchbox[player_name] = ""
+	unified_inventory.current_category[player_name] = "all"
+	unified_inventory.current_category_scroll[player_name] = 0
 	unified_inventory.alternate[player_name] = 1
 	unified_inventory.current_item[player_name] = nil
 	unified_inventory.current_craft_direction[player_name] = "recipe"
@@ -69,6 +71,41 @@ minetest.register_on_player_receive_fields(function(player, formname, fields)
 		unified_inventory.current_searchbox[player_name] = fields.searchbox
 	end
 
+
+	local clicked_category
+	for name, value in pairs(fields) do
+		local category_name = string.match(name, "^category_(.+)$")
+		if category_name then
+			clicked_category = category_name
+			break
+		end
+	end
+
+	if clicked_category
+	and clicked_category ~= unified_inventory.current_category[player_name] then
+		unified_inventory.current_category[player_name] = clicked_category
+		unified_inventory.apply_filter(player, unified_inventory.current_searchbox[player_name], "nochange")
+		unified_inventory.set_inventory_formspec(player,
+				unified_inventory.current_page[player_name])
+	end
+
+	if fields.next_category then
+		local scroll = math.min(#unified_inventory.category_list-ui_peruser.pagecols, unified_inventory.current_category_scroll[player_name] + 1)
+		if scroll ~= unified_inventory.current_category_scroll[player_name] then
+			unified_inventory.current_category_scroll[player_name] = scroll
+			unified_inventory.set_inventory_formspec(player,
+					unified_inventory.current_page[player_name])
+		end
+	end
+	if fields.prev_category then
+		local scroll = math.max(0, unified_inventory.current_category_scroll[player_name] - 1)
+		if scroll ~= unified_inventory.current_category_scroll[player_name] then
+			unified_inventory.current_category_scroll[player_name] = scroll
+			unified_inventory.set_inventory_formspec(player,
+					unified_inventory.current_page[player_name])
+		end
+	end
+
 	for i, def in pairs(unified_inventory.buttons) do
 		if fields[def.name] then
 			def.action(player)
@@ -126,6 +163,7 @@ minetest.register_on_player_receive_fields(function(player, formname, fields)
 			clicked_item = unified_inventory.demangle_for_formspec(mangled_item)
 			if string.sub(clicked_item, 1, 6) == "group:" then
 				-- Change search filter to this group
+				unified_inventory.current_category[player_name] = "all"
 				apply_new_filter(player, clicked_item, new_dir)
 				return
 			end
diff --git a/unified_inventory/category.lua b/unified_inventory/category.lua
new file mode 100644
index 0000000..72e4038
--- /dev/null
+++ b/unified_inventory/category.lua
@@ -0,0 +1,149 @@
+local S = minetest.get_translator("unified_inventory")
+
+unified_inventory.registered_categories = {}
+unified_inventory.registered_category_items = {}
+unified_inventory.category_list = {}
+
+local function char_to_sort_index(char_code)
+	if char_code <= 32 then
+		-- Command codes, no thanks
+		return 0
+	end
+	if char_code <= 64 then
+		-- Sorts numbers, and some punctuation, after letters
+		return char_code
+	end
+	if char_code >= 158 then
+		-- Out of sortable range
+		return 0
+	end
+	if char_code > 122 then
+		-- Avoids overlap with {, |, } and ~
+		return char_code - 58
+	end
+	if char_code > 96 then
+		-- Normalises lowercase with uppercase
+		return char_code - 96
+	end
+	return char_code - 64
+end
+
+local function string_to_sort_index(str)
+	local max_chars = 5
+	local power = 100
+	local index = 0
+	for i=1,math.min(#str, max_chars) do
+		index = index + (char_to_sort_index(string.byte(str, i))/(power^i))
+	end
+	return index
+end
+
+function update_category_list()
+	local category_list = {}
+	table.insert(category_list, {
+		name = "all",
+		label = S("All Items"),
+		symbol = "ui_category_all.png",
+		index = -2,
+	})
+	table.insert(category_list, {
+		name = "uncategorized",
+		label = S("Misc. Items"),
+		symbol = "ui_category_none.png",
+		index = -1,
+	})
+	for category, def in pairs(unified_inventory.registered_categories) do
+		table.insert(category_list, {
+			name = category,
+			label = def.label or category,
+			symbol = def.symbol,
+			index = def.index or                    -- sortby defined order
+					string_to_sort_index(category)  -- or do a rudimentary alphabetical sort
+		})
+	end
+	table.sort(category_list, function (a,b)
+		return a.index < b.index
+	end)
+	unified_inventory.category_list = category_list
+end
+
+local function ensure_category_exists(category_name)
+	if not unified_inventory.registered_categories[category_name] then
+		unified_inventory.registered_categories[category_name] = {
+			symbol = "default:stick",
+			label = category_name
+		}
+	end
+	if not unified_inventory.registered_category_items[category_name] then
+		unified_inventory.registered_category_items[category_name] = {}
+	end
+end
+
+function unified_inventory.register_category(category_name, config)
+	ensure_category_exists(category_name)
+	if config and config.symbol then
+		unified_inventory.set_category_symbol(category_name, config.symbol)
+	end
+	if config and config.label then
+		unified_inventory.set_category_label(category_name, config.label)
+	end
+	if config and config.index then
+		unified_inventory.set_category_index(category_name, config.index)
+	end
+	if config and config.items then
+		unified_inventory.add_category_items(category_name, config.items)
+	end
+	update_category_list()
+end
+function unified_inventory.set_category_symbol(category_name, symbol)
+	ensure_category_exists(category_name)
+	unified_inventory.registered_categories[category_name].symbol = symbol
+	update_category_list()
+end
+function unified_inventory.set_category_label(category_name, label)
+	ensure_category_exists(category_name)
+	unified_inventory.registered_categories[category_name].label = label
+	update_category_list()
+end
+function unified_inventory.set_category_index(category_name, index)
+	ensure_category_exists(category_name)
+	unified_inventory.registered_categories[category_name].index = index
+	update_category_list()
+end
+function unified_inventory.add_category_item(category_name, item)
+	ensure_category_exists(category_name)
+	unified_inventory.registered_category_items[category_name][item] = true
+end
+function unified_inventory.add_category_items(category_name, items)
+	for _,item in ipairs(items) do
+		unified_inventory.add_category_item(category_name, item)
+	end
+end
+
+function unified_inventory.remove_category_item(category_name, item)
+	unified_inventory.registered_category_items[category_name][item] = nil
+end
+function unified_inventory.remove_category(category_name)
+	unified_inventory.registered_categories[category_name] = nil
+	unified_inventory.registered_category_items[category_name] = nil
+	update_category_list()
+end
+
+function unified_inventory.find_category(item)
+	-- Returns the first category the item exists in
+	-- Best for checking if an item has any category at all
+	for category, items in pairs(unified_inventory.registered_category_items) do
+		if items[item] then return category end
+	end
+end
+function unified_inventory.find_categories(item)
+	-- Returns all the categories the item exists in
+	-- Best for listing all categories
+	local categories = {}
+	for category, items in pairs(unified_inventory.registered_category_items) do
+		if items[item] then
+			table.insert(categories, category)
+		end
+	end
+	return categories
+end
diff --git a/unified_inventory/default-categories.lua b/unified_inventory/default-categories.lua
new file mode 100644
index 0000000..57d3e88
--- /dev/null
+++ b/unified_inventory/default-categories.lua
@@ -0,0 +1,704 @@
+local S = minetest.get_translator("unified_inventory")
+
+unified_inventory.register_category('plants', {
+	symbol = "flowers:tulip",
+	label = S("Plant Life")
+})
+unified_inventory.register_category('building', {
+	symbol = "default:brick",
+	label = S("Building Materials")
+})
+unified_inventory.register_category('tools', {
+	symbol = "default:pick_diamond",
+	label = S("Tools")
+})
+unified_inventory.register_category('minerals', {
+	symbol = "default:iron_lump",
+	label = S("Minerals and Metals")
+})
+unified_inventory.register_category('environment', {
+	symbol = "default:dirt_with_grass",
+	label = S("Environment and Worldgen")
+})
+unified_inventory.register_category('lighting', {
+	symbol = "default:torch",
+	label = S("Lighting")
+})
+
+
+if unified_inventory.automatic_categorization then
+	minetest.register_on_mods_loaded(function()
+
+		-- Add biome nodes to environment category
+		for _,def in pairs(minetest.registered_biomes) do
+			local env_nodes = {
+				def.node_riverbed, def.node_top, def.node_filler, def.node_dust,
+			}
+			for i,node in pairs(env_nodes) do
+				if node then
+					unified_inventory.add_category_item('environment', node)
+				end
+			end
+		end
+
+		-- Add minable ores to minerals and everything else (pockets of stone & sand variations) to environment
+		for _,item in  pairs(minetest.registered_ores) do
+			if item.ore_type == "scatter" then
+				local drop = minetest.registered_nodes[item.ore].drop
+				if drop and drop ~= "" then
+					unified_inventory.add_category_item('minerals', item.ore)
+					unified_inventory.add_category_item('minerals', drop)
+				else
+					unified_inventory.add_category_item('environment', item.ore)
+				end
+			else
+				unified_inventory.add_category_item('environment', item.ore)
+			end
+		end
+
+		-- Add items by item definition
+		for name, def in pairs(minetest.registered_items) do
+			local group = def.groups or {}
+			if not group.not_in_creative_inventory then
+				if group.stair or
+				   group.slab or
+				   group.wall or
+				   group.fence then
+					unified_inventory.add_category_item('building', name)
+				elseif group.flora or
+					   group.flower or
+					   group.seed or
+					   group.leaves or
+					   group.sapling or
+					   group.tree then
+					unified_inventory.add_category_item('plants', name)
+				elseif def.type == 'tool' then
+					unified_inventory.add_category_item('tools', name)
+				elseif def.liquidtype == 'source' then
+					unified_inventory.add_category_item('environment', name)
+				elseif def.light_source and def.light_source > 0 then
+					unified_inventory.add_category_item('lighting', name)
+				elseif group.door or
+					   minetest.global_exists("doors") and (
+					     doors.registered_doors and doors.registered_doors[name..'_a'] or
+					     doors.registered_trapdoors and doors.registered_trapdoors[name]
+					   ) then
+					unified_inventory.add_category_item('building', name)
+				end
+			end
+		end
+	end)
+end
+
+-- [[
+unified_inventory.add_category_items('plants', {
+	"default:dry_grass_5",
+	"default:acacia_sapling",
+	"default:blueberry_bush_sapling",
+	"default:grass_2",
+	"default:pine_bush_stem",
+	"default:leaves",
+	"default:pine_needles",
+	"default:cactus",
+	"default:junglegrass",
+	"default:pine_sapling",
+	"default:sapling",
+	"default:bush_stem",
+	"default:dry_grass_2",
+	"default:fern_1",
+	"default:grass_3",
+	"default:marram_grass_1",
+	"default:pine_tree",
+	"default:dry_grass_3",
+	"default:dry_shrub",
+	"default:grass_4",
+	"default:marram_grass_2",
+	"default:jungleleaves",
+	"default:apple",
+	"default:tree",
+	"default:aspen_tree",
+	"default:bush_sapling",
+	"default:grass_5",
+	"default:blueberry_bush_leaves_with_berries",
+	"default:acacia_bush_sapling",
+	"default:grass_1",
+	"default:aspen_leaves",
+	"default:marram_grass_3",
+	"default:large_cactus_seedling",
+	"default:junglesapling",
+	"default:dry_grass_4",
+	"default:acacia_bush_stem",
+	"default:papyrus",
+	"default:pine_bush_needles",
+	"default:bush_leaves",
+	"default:fern_3",
+	"default:aspen_sapling",
+	"default:acacia_tree",
+	"default:apple_mark",
+	"default:acacia_leaves",
+	"default:jungletree",
+	"default:dry_grass_1",
+	"default:acacia_bush_leaves",
+	"default:emergent_jungle_sapling",
+	"default:fern_2",
+	"default:blueberries",
+	"default:sand_with_kelp",
+	"default:blueberry_bush_leaves",
+	"default:pine_bush_sapling",
+
+	"farming:cotton",
+	"farming:cotton_1",
+	"farming:cotton_2",
+	"farming:cotton_3",
+	"farming:cotton_4",
+	"farming:cotton_5",
+	"farming:cotton_6",
+	"farming:cotton_7",
+	"farming:cotton_8",
+	"farming:cotton_wild",
+	"farming:seed_cotton",
+	"farming:seed_wheat",
+	"farming:straw",
+	"farming:wheat",
+	"farming:wheat_1",
+	"farming:wheat_2",
+	"farming:wheat_3",
+	"farming:wheat_4",
+	"farming:wheat_5",
+	"farming:wheat_6",
+	"farming:wheat_7",
+	"farming:wheat_8",
+
+	"flowers:chrysanthemum_green",
+	"flowers:dandelion_white",
+	"flowers:dandelion_yellow",
+	"flowers:geranium",
+	"flowers:mushroom_brown",
+	"flowers:mushroom_red",
+	"flowers:rose",
+	"flowers:tulip",
+	"flowers:tulip_black",
+	"flowers:viola",
+	"flowers:waterlily",
+	"flowers:waterlily_waving",
+})
+
+unified_inventory.add_category_items('tools', {
+	"default:sword_diamond",
+	"default:axe_diamond",
+	"default:shovel_diamond",
+	"default:axe_steel",
+	"default:shovel_mese",
+	"default:sword_wood",
+	"default:pick_bronze",
+	"default:axe_stone",
+	"default:sword_stone",
+	"default:pick_stone",
+	"default:shovel_stone",
+	"default:sword_mese",
+	"default:shovel_bronze",
+	"default:sword_bronze",
+	"default:axe_bronze",
+	"default:shovel_steel",
+	"default:sword_steel",
+	"default:axe_mese",
+	"default:shovel_wood",
+	"default:pick_mese",
+	"default:axe_wood",
+	"default:pick_diamond",
+	"default:pick_wood",
+	"default:pick_steel",
+
+	"farming:hoe_bronze",
+	"farming:hoe_diamond",
+	"farming:hoe_mese",
+	"farming:hoe_steel",
+	"farming:hoe_stone",
+	"farming:hoe_wood",
+
+	"fire:flint_and_steel",
+	"map:mapping_kit",
+	"screwdriver:screwdriver",
+
+	"fireflies:bug_net",
+	"bucket:bucket_empty",
+
+	"binoculars:binoculars",
+	"default:skeleton_key",
+})
+
+unified_inventory.add_category_items('minerals', {
+	"default:stone_with_copper",
+	"default:stone_with_gold",
+	"default:stone_with_iron",
+	"default:copper_ingot",
+	"default:copper_lump",
+	"default:gold_lump",
+	"default:diamondblock",
+	"default:stone_with_diamond",
+	"default:stone_with_mese",
+	"default:steel_ingot",
+	"default:gold_ingot",
+	"default:iron_lump",
+	"default:tinblock",
+	"default:tin_lump",
+	"default:stone_with_tin",
+	"default:mese_crystal",
+	"default:diamond",
+	"default:bronze_ingot",
+	"default:mese",
+	"default:mese_crystal_fragment",
+	"default:copperblock",
+	"default:stone_with_coal",
+	"default:steelblock",
+	"default:tin_ingot",
+	"default:coalblock",
+	"default:coal_lump",
+	"default:bronzeblock",
+	"default:goldblock",
+
+	"stairs:slab_bronzeblock",
+	"stairs:slab_copperblock",
+	"stairs:slab_steelblock",
+	"stairs:slab_tinblock",
+	"stairs:stair_bronzeblock",
+	"stairs:stair_copperblock",
+	"stairs:stair_inner_bronzeblock",
+	"stairs:stair_inner_copperblock",
+	"stairs:stair_inner_steelblock",
+	"stairs:stair_inner_tinblock",
+	"stairs:stair_outer_bronzeblock",
+	"stairs:stair_outer_copperblock",
+	"stairs:stair_outer_steelblock",
+	"stairs:stair_outer_tinblock",
+	"stairs:stair_steelblock",
+	"stairs:stair_tinblock",
+})
+
+unified_inventory.add_category_items('building', {
+	"default:fence_rail_aspen_wood",
+	"default:fence_rail_acacia_wood",
+	"default:fence_junglewood",
+	"default:fence_rail_junglewood",
+	"default:fence_aspen_wood",
+	"default:fence_pine_wood",
+	"default:fence_rail_wood",
+	"default:fence_rail_pine_wood",
+	"default:fence_acacia_wood",
+	"default:junglewood",
+	"default:acacia_wood",
+	"default:aspen_wood",
+	"default:fence_wood",
+	"default:pine_wood",
+	"default:silver_sandstone",
+	"default:desert_sandstone",
+	"default:sandstone_block",
+	"default:desert_sandstone_brick",
+	"default:stone_block",
+	"default:stonebrick",
+	"default:obsidian_glass",
+	"default:desert_sandstone_block",
+	"default:silver_sandstone_brick",
+	"default:brick",
+	"default:obsidianbrick",
+	"default:sandstonebrick",
+	"default:sandstone",
+	"default:desert_stone_block",
+	"default:silver_sandstone_block",
+	"default:wood",
+	"default:obsidian_block",
+	"default:glass",
+	"default:clay_brick",
+	"default:desert_stonebrick",
+	"default:desert_cobble",
+	"default:cobble",
+	"default:mossycobble",
+
+	"doors:door_glass",
+	"doors:door_glass_a",
+	"doors:door_glass_b",
+	"doors:door_glass_c",
+	"doors:door_glass_d",
+	"doors:door_obsidian_glass",
+	"doors:door_obsidian_glass_a",
+	"doors:door_obsidian_glass_b",
+	"doors:door_obsidian_glass_c",
+	"doors:door_obsidian_glass_d",
+	"doors:door_steel",
+	"doors:door_steel_a",
+	"doors:door_steel_b",
+	"doors:door_steel_c",
+	"doors:door_steel_d",
+	"doors:door_wood",
+	"doors:door_wood_a",
+	"doors:door_wood_b",
+	"doors:door_wood_c",
+	"doors:door_wood_d",
+	"doors:gate_acacia_wood_closed",
+	"doors:gate_acacia_wood_open",
+	"doors:gate_aspen_wood_closed",
+	"doors:gate_aspen_wood_open",
+	"doors:gate_junglewood_closed",
+	"doors:gate_junglewood_open",
+	"doors:gate_pine_wood_closed",
+	"doors:gate_pine_wood_open",
+	"doors:gate_wood_closed",
+	"doors:gate_wood_open",
+	"doors:hidden",
+	"doors:trapdoor",
+	"doors:trapdoor_open",
+	"doors:trapdoor_steel",
+	"doors:trapdoor_steel_open",
+
+	"stairs:slab_bronzeblock",
+	"stairs:slab_copperblock",
+	"stairs:slab_steelblock",
+	"stairs:slab_tinblock",
+	"stairs:stair_bronzeblock",
+	"stairs:stair_copperblock",
+	"stairs:stair_inner_bronzeblock",
+	"stairs:stair_inner_copperblock",
+	"stairs:stair_inner_steelblock",
+	"stairs:stair_inner_tinblock",
+	"stairs:stair_outer_bronzeblock",
+	"stairs:stair_outer_copperblock",
+	"stairs:stair_outer_steelblock",
+	"stairs:stair_outer_tinblock",
+	"stairs:stair_steelblock",
+	"stairs:stair_tinblock",
+
+	"stairs:slab_acacia_wood",
+	"stairs:slab_aspen_wood",
+	"stairs:slab_brick",
+	"stairs:slab_cobble",
+	"stairs:slab_desert_cobble",
+	"stairs:slab_desert_sandstone",
+	"stairs:slab_desert_sandstone_block",
+	"stairs:slab_desert_sandstone_brick",
+	"stairs:slab_desert_stone",
+	"stairs:slab_desert_stone_block",
+	"stairs:slab_desert_stonebrick",
+	"stairs:slab_glass",
+	"stairs:slab_goldblock",
+	"stairs:slab_ice",
+	"stairs:slab_junglewood",
+	"stairs:slab_mossycobble",
+	"stairs:slab_obsidian",
+	"stairs:slab_obsidian_block",
+	"stairs:slab_obsidian_glass",
+	"stairs:slab_obsidianbrick",
+	"stairs:slab_pine_wood",
+	"stairs:slab_sandstone",
+	"stairs:slab_sandstone_block",
+	"stairs:slab_sandstonebrick",
+	"stairs:slab_silver_sandstone",
+	"stairs:slab_silver_sandstone_block",
+	"stairs:slab_silver_sandstone_brick",
+	"stairs:slab_snowblock",
+	"stairs:slab_stone",
+	"stairs:slab_stone_block",
+	"stairs:slab_stonebrick",
+	"stairs:slab_straw",
+	"stairs:slab_wood",
+	"stairs:stair_acacia_wood",
+	"stairs:stair_aspen_wood",
+	"stairs:stair_brick",
+	"stairs:stair_cobble",
+	"stairs:stair_desert_cobble",
+	"stairs:stair_desert_sandstone",
+	"stairs:stair_desert_sandstone_block",
+	"stairs:stair_desert_sandstone_brick",
+	"stairs:stair_desert_stone",
+	"stairs:stair_desert_stone_block",
+	"stairs:stair_desert_stonebrick",
+	"stairs:stair_glass",
+	"stairs:stair_goldblock",
+	"stairs:stair_ice",
+	"stairs:stair_inner_acacia_wood",
+	"stairs:stair_inner_aspen_wood",
+	"stairs:stair_inner_brick",
+	"stairs:stair_inner_cobble",
+	"stairs:stair_inner_desert_cobble",
+	"stairs:stair_inner_desert_sandstone",
+	"stairs:stair_inner_desert_sandstone_block",
+	"stairs:stair_inner_desert_sandstone_brick",
+	"stairs:stair_inner_desert_stone",
+	"stairs:stair_inner_desert_stone_block",
+	"stairs:stair_inner_desert_stonebrick",
+	"stairs:stair_inner_glass",
+	"stairs:stair_inner_goldblock",
+	"stairs:stair_inner_ice",
+	"stairs:stair_inner_junglewood",
+	"stairs:stair_inner_mossycobble",
+	"stairs:stair_inner_obsidian",
+	"stairs:stair_inner_obsidian_block",
+	"stairs:stair_inner_obsidian_glass",
+	"stairs:stair_inner_obsidianbrick",
+	"stairs:stair_inner_pine_wood",
+	"stairs:stair_inner_sandstone",
+	"stairs:stair_inner_sandstone_block",
+	"stairs:stair_inner_sandstonebrick",
+	"stairs:stair_inner_silver_sandstone",
+	"stairs:stair_inner_silver_sandstone_block",
+	"stairs:stair_inner_silver_sandstone_brick",
+	"stairs:stair_inner_snowblock",
+	"stairs:stair_inner_stone",
+	"stairs:stair_inner_stone_block",
+	"stairs:stair_inner_stonebrick",
+	"stairs:stair_inner_straw",
+	"stairs:stair_inner_wood",
+	"stairs:stair_junglewood",
+	"stairs:stair_mossycobble",
+	"stairs:stair_obsidian",
+	"stairs:stair_obsidian_block",
+	"stairs:stair_obsidian_glass",
+	"stairs:stair_obsidianbrick",
+	"stairs:stair_outer_acacia_wood",
+	"stairs:stair_outer_aspen_wood",
+	"stairs:stair_outer_brick",
+	"stairs:stair_outer_cobble",
+	"stairs:stair_outer_desert_cobble",
+	"stairs:stair_outer_desert_sandstone",
+	"stairs:stair_outer_desert_sandstone_block",
+	"stairs:stair_outer_desert_sandstone_brick",
+	"stairs:stair_outer_desert_stone",
+	"stairs:stair_outer_desert_stone_block",
+	"stairs:stair_outer_desert_stonebrick",
+	"stairs:stair_outer_glass",
+	"stairs:stair_outer_goldblock",
+	"stairs:stair_outer_ice",
+	"stairs:stair_outer_junglewood",
+	"stairs:stair_outer_mossycobble",
+	"stairs:stair_outer_obsidian",
+	"stairs:stair_outer_obsidian_block",
+	"stairs:stair_outer_obsidian_glass",
+	"stairs:stair_outer_obsidianbrick",
+	"stairs:stair_outer_pine_wood",
+	"stairs:stair_outer_sandstone",
+	"stairs:stair_outer_sandstone_block",
+	"stairs:stair_outer_sandstonebrick",
+	"stairs:stair_outer_silver_sandstone",
+	"stairs:stair_outer_silver_sandstone_block",
+	"stairs:stair_outer_silver_sandstone_brick",
+	"stairs:stair_outer_snowblock",
+	"stairs:stair_outer_stone",
+	"stairs:stair_outer_stone_block",
+	"stairs:stair_outer_stonebrick",
+	"stairs:stair_outer_straw",
+	"stairs:stair_outer_wood",
+	"stairs:stair_pine_wood",
+	"stairs:stair_sandstone",
+	"stairs:stair_sandstone_block",
+	"stairs:stair_sandstonebrick",
+	"stairs:stair_silver_sandstone",
+	"stairs:stair_silver_sandstone_block",
+	"stairs:stair_silver_sandstone_brick",
+	"stairs:stair_snowblock",
+	"stairs:stair_stone",
+	"stairs:stair_stone_block",
+	"stairs:stair_stonebrick",
+	"stairs:stair_straw",
+	"stairs:stair_wood",
+
+	"xpanes:bar",
+	"xpanes:bar_flat",
+	"xpanes:door_steel_bar",
+	"xpanes:door_steel_bar_a",
+	"xpanes:door_steel_bar_b",
+	"xpanes:door_steel_bar_c",
+	"xpanes:door_steel_bar_d",
+	"xpanes:obsidian_pane",
+	"xpanes:obsidian_pane_flat",
+	"xpanes:pane",
+	"xpanes:pane_flat",
+	"xpanes:trapdoor_steel_bar",
+	"xpanes:trapdoor_steel_bar_open",
+
+	"walls:cobble",
+	"walls:desertcobble",
+	"walls:mossycobble",
+})
+
+unified_inventory.add_category_items('environment', {
+	"air",
+	"default:cave_ice",
+	"default:dirt_with_rainforest_litter",
+	"default:gravel",
+	"default:dry_dirt_with_dry_grass",
+	"default:permafrost",
+	"default:desert_stone",
+	"default:ice",
+	"default:dry_dirt",
+	"default:obsidian",
+	"default:sand",
+	"default:river_water_source",
+	"default:dirt_with_snow",
+	"default:dirt_with_grass",
+	"default:water_flowing",
+	"default:dirt",
+	"default:desert_sand",
+	"default:permafrost_with_moss",
+	"default:dirt_with_coniferous_litter",
+	"default:water_source",
+	"default:dirt_with_dry_grass",
+	"default:river_water_flowing",
+	"default:stone",
+	"default:snow",
+	"default:lava_flowing",
+	"default:lava_source",
+	"default:permafrost_with_stones",
+	"default:dirt_with_grass_footsteps",
+	"default:silver_sand",
+	"default:snowblock",
+	"default:clay",
+
+	"farming:desert_sand_soil",
+	"farming:desert_sand_soil_wet",
+	"farming:dry_soil",
+	"farming:dry_soil_wet",
+	"farming:soil",
+	"farming:soil_wet",
+})
+
+unified_inventory.add_category_items('lighting', {
+	"default:mese_post_light_junglewood",
+	"default:torch_ceiling",
+	"default:meselamp",
+	"default:torch",
+	"default:mese_post_light_acacia_wood",
+	"default:mese_post_light",
+	"default:torch_wall",
+	"default:mese_post_light_pine_wood",
+	"default:mese_post_light_aspen_wood"
+})
+--]]
+
+
+--[[ UNCATEGORISED
+
+	"farming:string",
+
+	"beds:bed_bottom",
+	"beds:bed_top",
+	"beds:fancy_bed_bottom",
+	"beds:fancy_bed_top",
+	"boats:boat",
+	"bones:bones",
+
+	"bucket:bucket_lava",
+	"bucket:bucket_river_water",
+	"bucket:bucket_water",
+
+	"butterflies:butterfly_red",
+	"butterflies:butterfly_violet",
+	"butterflies:butterfly_white",
+	"butterflies:hidden_butterfly_red",
+	"butterflies:hidden_butterfly_violet",
+	"butterflies:hidden_butterfly_white",
+
+	"carts:brakerail",
+	"carts:cart",
+	"carts:powerrail",
+	"carts:rail",
+
+	"default:book",
+	"default:book_written",
+	"default:bookshelf",
+	"default:chest",
+	"default:chest_locked",
+	"default:chest_locked_open",
+	"default:chest_open",
+	"default:clay_lump",
+	"default:cloud",
+	"default:coral_brown",
+	"default:coral_cyan",
+	"default:coral_green",
+	"default:coral_orange",
+	"default:coral_pink",
+	"default:coral_skeleton",
+	"default:flint",
+	"default:furnace",
+	"default:furnace_active",
+	"default:key",
+	"default:ladder_steel",
+	"default:ladder_wood",
+	"default:obsidian_shard",
+	"default:paper",
+	"default:sign_wall_steel",
+	"default:sign_wall_wood",
+	"default:stick",
+
+	"fire:basic_flame",
+	"fire:permanent_flame",
+	"fireflies:firefly",
+	"fireflies:firefly_bottle",
+	"fireflies:hidden_firefly",
+
+	"ignore",
+	"unknown",
+
+	"tnt:boom",
+	"tnt:gunpowder",
+	"tnt:gunpowder_burning",
+	"tnt:tnt",
+	"tnt:tnt_burning",
+	"tnt:tnt_stick",
+
+	"vessels:drinking_glass",
+	"vessels:glass_bottle",
+	"vessels:glass_fragments",
+	"vessels:shelf",
+	"vessels:steel_bottle",
+
+	"dye:black",
+	"dye:blue",
+	"dye:brown",
+	"dye:cyan",
+	"dye:dark_green",
+	"dye:dark_grey",
+	"dye:green",
+	"dye:grey",
+	"dye:magenta",
+	"dye:orange",
+	"dye:pink",
+	"dye:red",
+	"dye:violet",
+	"dye:white",
+	"dye:yellow",
+
+	"wool:black",
+	"wool:blue",
+	"wool:brown",
+	"wool:cyan",
+	"wool:dark_green",
+	"wool:dark_grey",
+	"wool:green",
+	"wool:grey",
+	"wool:magenta",
+	"wool:orange",
+	"wool:pink",
+	"wool:red",
+	"wool:violet",
+	"wool:white",
+	"wool:yellow",
+
+	"unified_inventory:bag_large",
+	"unified_inventory:bag_medium",
+	"unified_inventory:bag_small",
+--]]
+
+--[[ LIST UNCATEGORIZED AFTER LOAD
+minetest.register_on_mods_loaded(function()
+	minetest.after(1, function ( )
+		local l = {}
+		for name,_ in pairs(minetest.registered_items) do
+			if not unified_inventory.find_category(name) then
+				-- minetest.log("error", minetest.serialize(minetest.registered_items[name]))
+				table.insert(l, name)
+			end
+		end
+		table.sort(l)
+		minetest.log(table.concat(l, '",'.."\n"..'"'))
+	end)
+end)
+--]]
\ No newline at end of file
diff --git a/unified_inventory/init.lua b/unified_inventory/init.lua
index 7be101c..391eb3c 100644
--- a/unified_inventory/init.lua
+++ b/unified_inventory/init.lua
@@ -10,6 +10,8 @@ unified_inventory = {
 	alternate = {},
 	current_page = {},
 	current_searchbox = {},
+	current_category = {},
+	current_category_scroll = {},
 	current_index = {},
 	current_item = {},
 	current_craft_direction = {},
@@ -33,23 +35,110 @@ unified_inventory = {
 	-- "Lite" mode
 	lite_mode = minetest.settings:get_bool("unified_inventory_lite"),
 
+	-- Items automatically added to categories based on item definitions
+	automatic_categorization = (minetest.settings:get_bool("unified_inventory_automatic_categorization") ~= false),
+
 	-- Trash enabled
 	trash_enabled = (minetest.settings:get_bool("unified_inventory_trash") ~= false),
-
-	pagecols = 8,
-	pagerows = 10,
-	page_y = 0,
-	formspec_y = 1,
-	main_button_x = 0,
-	main_button_y = 9,
-	craft_result_x = 0.3,
-	craft_result_y = 0.5,
-	form_header_y = 0,
-	standard_background = "background[-0.2,-0.2;1,1;ui_form_bg.png;true]",    -- the 'true' scales to fill, overrides the 1,1
-	standard_inv =        "list[current_player;main;0,YYY;8,4;]",             -- the YYY's are placeholders which get
-	standard_inv_bg =     "image[-0.1,YYY;10.05,4.70;ui_main_inventory.png]", -- replaced later by string.gsub()
+	imgscale = 1.25,
+	list_img_offset = 0.13,
+	standard_background = "background9[0,0;1,1;ui_formbg_9_sliced.png;true;16]",
+	version = 2
 }
 
+local ui = unified_inventory
+
+-- These tables establish position and layout for the two UI styles.
+-- UI doesn't use formspec_[xy] anymore, but other mods may need them.
+
+ui.style_full = {
+	formspec_x = 1,
+	formspec_y = 1,
+	formw = 17.75,
+	formh = 12.25,
+	pagecols = 8,
+	pagerows = 9,
+	page_x = 10.75,
+	page_y = 2.30,
+	craft_x = 2.8,
+	craft_y = 1.15,
+	craftresult_x = 7.8,
+	craft_arrow_x = 6.55,
+	craft_guide_x = 3.3,
+	craft_guide_y = 1.15,
+	craft_guide_arrow_x = 7.05,
+	craft_guide_result_x = 8.3,
+	craft_guide_resultstr_x = 0.3,
+	craft_guide_resultstr_y = 0.6,
+	give_btn_x = 0.25,
+	main_button_x = 0.4,
+	main_button_y = 11.0,
+	page_buttons_x = 11.60,
+	page_buttons_y = 10.15,
+	searchwidth = 3.4,
+	form_header_x = 0.4,
+	form_header_y = 0.4,
+	btn_spc = 0.85,
+	btn_size = 0.75,
+	std_inv_x = 0.3,
+	std_inv_y = 5.75,
+}
+
+ui.style_lite = {
+	formspec_x =  0.6,
+	formspec_y =  0.6,
+	formw = 14,
+	formh = 9.75,
+	pagecols = 4,
+	pagerows = 5,
+	page_x = 10.5,
+	page_y = 2.15,
+	craft_x = 2.6,
+	craft_y = 0.75,
+	craftresult_x = 5.75,
+	craft_arrow_x = 6.35,
+	craft_guide_x = 3.1,
+	craft_guide_y = 0.75,
+	craft_guide_arrow_x = 7.05,
+	craft_guide_result_x = 8.3,
+	craft_guide_resultstr_x = 0.15,
+	craft_guide_resultstr_y = 0.35,
+	give_btn_x = 0.15,
+	main_button_x = 10.5,
+	main_button_y = 8.15,
+	page_buttons_x = 10.5,
+	page_buttons_y = 6.15,
+	searchwidth = 1.6,
+	form_header_x =  0.2,
+	form_header_y =  0.2,
+	btn_spc = 0.8,
+	btn_size = 0.7,
+	std_inv_x = 0.1,
+	std_inv_y = 4.6,
+}
+
+dofile(modpath.."/api.lua")
+
+for _, style in ipairs({ui.style_full, ui.style_lite}) do
+	style.items_per_page =  style.pagecols * style.pagerows
+	style.standard_inv = string.format("list[current_player;main;%f,%f;8,4;]",
+							style.std_inv_x + ui.list_img_offset, style.std_inv_y + ui.list_img_offset)
+
+	style.standard_inv_bg = ui.make_inv_img_grid(style.std_inv_x, style.std_inv_y, 8, 1, true)..
+							ui.make_inv_img_grid(style.std_inv_x, style.std_inv_y + ui.imgscale, 8, 3)
+
+	style.craft_grid =	table.concat({
+							ui.make_inv_img_grid(style.craft_x, style.craft_y, 3, 3),
+							ui.single_slot(style.craft_x + ui.imgscale*4, style.craft_y), -- the craft result slot
+							string.format("image[%f,%f;%f,%f;ui_crafting_arrow.png]",
+							style.craft_arrow_x, style.craft_y, ui.imgscale, ui.imgscale),
+							string.format("list[current_player;craft;%f,%f;3,3;]",
+								style.craft_x + ui.list_img_offset, style.craft_y + ui.list_img_offset),
+							string.format("list[current_player;craftpreview;%f,%f;1,1;]",
+								style.craftresult_x + ui.list_img_offset, style.craft_y + ui.list_img_offset)
+						})
+end
+
 -- Disable default creative inventory
 local creative = rawget(_G, "creative") or rawget(_G, "creative_inventory")
 if creative then
@@ -65,7 +154,8 @@ if sfinv then
 end
 
 dofile(modpath.."/group.lua")
-dofile(modpath.."/api.lua")
+dofile(modpath.."/category.lua")
+dofile(modpath.."/default-categories.lua")
 dofile(modpath.."/internal.lua")
 dofile(modpath.."/callbacks.lua")
 dofile(modpath.."/match_craft.lua")
diff --git a/unified_inventory/internal.lua b/unified_inventory/internal.lua
index 78cba2a..6113300 100644
--- a/unified_inventory/internal.lua
+++ b/unified_inventory/internal.lua
@@ -1,5 +1,6 @@
 local S = minetest.get_translator("unified_inventory")
 local F = minetest.formspec_escape
+local ui = unified_inventory
 
 -- This pair of encoding functions is used where variable text must go in
 -- button names, where the text might contain formspec metacharacters.
@@ -9,78 +10,61 @@ local F = minetest.formspec_escape
 -- This is a game engine bug, and in the anticipation that it might be
 -- fixed some day we don't want to rely on it.  So for safety we apply
 -- an encoding that avoids all formspec metacharacters.
-function unified_inventory.mangle_for_formspec(str)
+
+function ui.mangle_for_formspec(str)
 	return string.gsub(str, "([^A-Za-z0-9])", function (c) return string.format("_%d_", string.byte(c)) end)
 end
-function unified_inventory.demangle_for_formspec(str)
+function ui.demangle_for_formspec(str)
 	return string.gsub(str, "_([0-9]+)_", function (v) return string.char(v) end)
 end
 
-function unified_inventory.get_per_player_formspec(player_name)
-	local lite = unified_inventory.lite_mode and not minetest.check_player_privs(player_name, {ui_full=true})
 
-	local ui = {}
-	ui.pagecols = unified_inventory.pagecols
-	ui.pagerows = unified_inventory.pagerows
-	ui.page_y = unified_inventory.page_y
-	ui.formspec_y = unified_inventory.formspec_y
-	ui.main_button_x = unified_inventory.main_button_x
-	ui.main_button_y = unified_inventory.main_button_y
-	ui.craft_result_x = unified_inventory.craft_result_x
-	ui.craft_result_y = unified_inventory.craft_result_y
-	ui.form_header_y = unified_inventory.form_header_y
+function ui.get_per_player_formspec(player_name)
+	local draw_lite_mode = ui.lite_mode and not minetest.check_player_privs(player_name, {ui_full=true})
 
-	if lite then
-		ui.pagecols = 4
-		ui.pagerows = 6
-		ui.page_y = 0.25
-		ui.formspec_y = 0.47
-		ui.main_button_x = 8.2
-		ui.main_button_y = 6.5
-		ui.craft_result_x = 2.8
-		ui.craft_result_y = 3.4
-		ui.form_header_y = -0.1
-	end
-
-	ui.items_per_page = ui.pagecols * ui.pagerows
-	return ui, lite
+	return table.copy(draw_lite_mode and ui.style_lite or ui.style_full), draw_lite_mode
 end
 
-function unified_inventory.get_formspec(player, page)
+local function formspec_button(ui_peruser, name, image, offset, pos, scale, label)
+	local element = 'image_button'
+	if minetest.registered_items[image] then
+		element = 'item_image_button'
+	end
+	local spc = (1-scale)*ui_peruser.btn_size/2
+	local size = ui_peruser.btn_size*scale
+	return string.format("%s[%f,%f;%f,%f;%s;%s;]", element,
+		(offset.x or offset[1]) + ( ui_peruser.btn_spc * (pos.x or pos[1]) ) + spc,
+		(offset.y or offset[2]) + ( ui_peruser.btn_spc * (pos.y or pos[2]) ) + spc,
+		size, size, image, name) ..
+		string.format("tooltip[%s;%s]", name, F(label or name))
+end
+
+function ui.get_formspec(player, page)
 
 	if not player then
 		return ""
 	end
 
 	local player_name = player:get_player_name()
-	local ui_peruser,draw_lite_mode = unified_inventory.get_per_player_formspec(player_name)
+	local ui_peruser,draw_lite_mode = ui.get_per_player_formspec(player_name)
 
-	unified_inventory.current_page[player_name] = page
-	local pagedef = unified_inventory.pages[page]
+	ui.current_page[player_name] = page
+	local pagedef = ui.pages[page]
 
 	if not pagedef then
 		return "" -- Invalid page name
 	end
-
+	
 	local formspec = {
-		"size[14,10]",
+		"formspec_version[4]",
+		"size["..ui_peruser.formw..","..ui_peruser.formh.."]",
 		pagedef.formspec_prepend and "" or "no_prepend[]",
-		unified_inventory.standard_background -- Background
+		ui.standard_background
 	}
-	local n = 4
 
-	if draw_lite_mode then
-		formspec[1] = "size[11,7.7]"
-		formspec[3] = unified_inventory.standard_background
-	end
+	local n = 5
 
-	if unified_inventory.is_creative(player_name)
-	and page == "craft" then
-		formspec[n] = "background[0,"..(ui_peruser.formspec_y + 2)..";1,1;ui_single_slot.png]"
-		n = n+1
-	end
-
-	local perplayer_formspec = unified_inventory.get_per_player_formspec(player_name)
+	local perplayer_formspec = ui.get_per_player_formspec(player_name)
 	local fsdata = pagedef.get_formspec(player, perplayer_formspec)
 
 	formspec[n] = fsdata.formspec
@@ -93,7 +77,7 @@ function unified_inventory.get_formspec(player, page)
 
 	local filtered_inv_buttons = {}
 
-	for i, def in pairs(unified_inventory.buttons) do
+	for i, def in pairs(ui.buttons) do
 		if not (draw_lite_mode and def.hide_lite) then
 			table.insert(filtered_inv_buttons, def)
 		end
@@ -108,21 +92,20 @@ function unified_inventory.get_formspec(player, page)
 
 		if def.type == "image" then
 			if (def.condition == nil or def.condition(player) == true) then
-				formspec[n] = "image_button["
-				formspec[n+1] = ( ui_peruser.main_button_x + 0.65 * (i - 1) - button_col * 0.65 * 4)
-				formspec[n+2] = ","..(ui_peruser.main_button_y + button_row * 0.7)..";0.8,0.8;"
-				formspec[n+3] = F(def.image)..";"
-				formspec[n+4] = F(def.name)..";]"
-				formspec[n+5] = "tooltip["..F(def.name)
-				formspec[n+6] = ";"..(def.tooltip or "").."]"
-				n = n+7
+				formspec[n] = string.format("image_button[%f,%f;%f,%f;%s;%s;]",
+					ui_peruser.main_button_x + ui_peruser.btn_spc * (i - 1) - button_col * ui_peruser.btn_spc * 4,
+					ui_peruser.main_button_y + button_row * ui_peruser.btn_spc,
+					ui_peruser.btn_size,ui_peruser.btn_size,
+					F(def.image),
+					F(def.name))
+				formspec[n+1] = "tooltip["..F(def.name)..";"..(def.tooltip or "").."]"
+				n = n+2
 			else
-				formspec[n] = "image["
-				formspec[n+1] = ( ui_peruser.main_button_x + 0.65 * (i - 1) - button_col * 0.65 * 4)
-				formspec[n+2] = ","..(ui_peruser.main_button_y + button_row * 0.7)..";0.8,0.8;"
-				formspec[n+3] = F(def.image).."^[colorize:#808080:alpha]"
-				n = n+4
-
+				formspec[n] = string.format("image[%f,%f;%f,%f;%s^[colorize:#808080:alpha]",
+				ui_peruser.main_button_x + ui_peruser.btn_spc * (i - 1) - button_col * ui_peruser.btn_spc * 4,
+				ui_peruser.main_button_y + button_row * ui_peruser.btn_spc,
+				ui_peruser.btn_size,ui_peruser.btn_size,def.image)
+				n = n+1
 			end
 		end
 	end
@@ -130,7 +113,7 @@ function unified_inventory.get_formspec(player, page)
 	if fsdata.draw_inventory ~= false then
 		-- Player inventory
 		formspec[n] = "listcolors[#00000000;#00000000]"
-		formspec[n+1] = string.gsub(unified_inventory.standard_inv, "YYY", ui_peruser.formspec_y + 3.5)
+		formspec[n+1] = ui_peruser.standard_inv
 		n = n+2
 	end
 
@@ -138,71 +121,94 @@ function unified_inventory.get_formspec(player, page)
 		return table.concat(formspec, "")
 	end
 
-	-- Controls to flip items pages
-	local start_x = 9.2
+	-- Category filters
 
-	if not draw_lite_mode then
-		formspec[n] =
-			"image_button[" .. (start_x + 0.6 * 0)
-				.. ",9;.8,.8;ui_skip_backward_icon.png;start_list;]"
-			.. "tooltip[start_list;" .. F(S("First page")) .. "]"
+	local categories_pos = { ui_peruser.page_x, ui_peruser.page_y-ui_peruser.btn_spc-0.5 }
+	local categories_scroll_pos = { ui_peruser.page_x, ui_peruser.form_header_y-(draw_lite_mode and 0 or 0.2) }
 
-			.. "image_button[" .. (start_x + 0.6 * 1)
-				.. ",9;.8,.8;ui_doubleleft_icon.png;rewind3;]"
-			.. "tooltip[rewind3;" .. F(S("Back three pages")) .. "]"
-			.. "image_button[" .. (start_x + 0.6 * 2)
-				.. ",9;.8,.8;ui_left_icon.png;rewind1;]"
-			.. "tooltip[rewind1;" .. F(S("Back one page")) .. "]"
+	formspec[n] = string.format("background9[%f,%f;%f,%f;%s;false;3]",
+		ui_peruser.page_x-0.1, categories_scroll_pos[2],
+		(ui_peruser.btn_spc * ui_peruser.pagecols) + 0.13, 1.4+(draw_lite_mode and 0 or 0.2),
+		"ui_smallbg_9_sliced.png")
+	n = n + 1
 
-			.. "image_button[" .. (start_x + 0.6 * 3)
-				.. ",9;.8,.8;ui_right_icon.png;forward1;]"
-			.. "tooltip[forward1;" .. F(S("Forward one page")) .. "]"
-			.. "image_button[" .. (start_x + 0.6 * 4)
-				.. ",9;.8,.8;ui_doubleright_icon.png;forward3;]"
-			.. "tooltip[forward3;" .. F(S("Forward three pages")) .. "]"
+	formspec[n] = string.format("label[%f,%f;%s]", ui_peruser.page_x, ui_peruser.form_header_y+(draw_lite_mode and 0.3 or 0.2), "Category:")
+	n = n + 1
 
-			.. "image_button[" .. (start_x + 0.6 * 5)
-				.. ",9;.8,.8;ui_skip_forward_icon.png;end_list;]"
-			.. "tooltip[end_list;" .. F(S("Last page")) .. "]"
-	else
-		formspec[n] =
-			"image_button[" .. (8.2 + 0.65 * 0)
-				.. ",5.8;.8,.8;ui_skip_backward_icon.png;start_list;]"
-			.. "tooltip[start_list;" .. F(S("First page")) .. "]"
-			.. "image_button[" .. (8.2 + 0.65 * 1)
-				.. ",5.8;.8,.8;ui_left_icon.png;rewind1;]"
-			.. "tooltip[rewind1;" .. F(S("Back one page")) .. "]"
-			.. "image_button[" .. (8.2 + 0.65 * 2)
-				.. ",5.8;.8,.8;ui_right_icon.png;forward1;]"
-			.. "tooltip[forward1;" .. F(S("Forward one page")) .. "]"
-			.. "image_button[" .. (8.2 + 0.65 * 3)
-				.. ",5.8;.8,.8;ui_skip_forward_icon.png;end_list;]"
-			.. "tooltip[end_list;" .. F(S("Last page")) .. "]"
+	local scroll_offset = 0
+	local category_count = #unified_inventory.category_list
+	if category_count > ui_peruser.pagecols then
+		scroll_offset = unified_inventory.current_category_scroll[player_name]
+	end
+
+	for index, category in ipairs(unified_inventory.category_list) do
+		local column = index - scroll_offset
+		if column > 0 and column <= ui_peruser.pagecols then
+			local scale = 0.8
+			if unified_inventory.current_category[player_name] == category.name then
+				scale = 1
+			end
+			formspec[n] = formspec_button(ui_peruser, "category_"..category.name, category.symbol, categories_pos, {column-1, 0}, scale, category.label)
+			n = n + 1
+		end
+	end
+	if category_count > ui_peruser.pagecols and scroll_offset > 0 then
+		-- prev
+		formspec[n] = formspec_button(ui_peruser, "prev_category", "ui_left_icon.png", categories_scroll_pos, {ui_peruser.pagecols - 2, 0}, 0.8, S("Scroll categories left"))
+		n = n + 1
+	end
+	if category_count > ui_peruser.pagecols and category_count - scroll_offset > ui_peruser.pagecols then
+		-- next
+		formspec[n] = formspec_button(ui_peruser, "next_category", "ui_right_icon.png", categories_scroll_pos, {ui_peruser.pagecols - 1, 0}, 0.8, S("Scroll categories right"))
+		n = n + 1
 	end
-	n = n+1
 
 	-- Search box
 	formspec[n] = "field_close_on_enter[searchbox;false]"
-	n = n+1
 
-	if not draw_lite_mode then
-		formspec[n] = "field[9.5,8.325;3,1;searchbox;;"
-			.. F(unified_inventory.current_searchbox[player_name]) .. "]"
-		formspec[n+1] = "image_button[12.2,8.1;.8,.8;ui_search_icon.png;searchbutton;]"
-			.. "tooltip[searchbutton;" ..F(S("Search")) .. "]"
-		formspec[n+2] = "image_button[12.9,8.1;.8,.8;ui_reset_icon.png;searchresetbutton;]"
-			.. "tooltip[searchbutton;" ..F(S("Search")) .. "]"
-			.. "tooltip[searchresetbutton;" ..F(S("Reset search and display everything")) .. "]"
-	else
-		formspec[n] = "field[8.5,5.225;2.2,1;searchbox;;"
-			.. F(unified_inventory.current_searchbox[player_name]) .. "]"
-		formspec[n+1] = "image_button[10.3,5;.8,.8;ui_search_icon.png;searchbutton;]"
-			.. "tooltip[searchbutton;" ..F(S("Search")) .. "]"
-		formspec[n+2] = "image_button[11,5;.8,.8;ui_reset_icon.png;searchresetbutton;]"
-			.. "tooltip[searchbutton;" ..F(S("Search")) .. "]"
-			.. "tooltip[searchresetbutton;" ..F(S("Reset search and display everything")) .. "]"
+	formspec[n+1] = string.format("field[%f,%f;%f,%f;searchbox;;%s]",
+		ui_peruser.page_buttons_x, ui_peruser.page_buttons_y,
+		ui_peruser.searchwidth - 0.1, ui_peruser.btn_size,
+		F(ui.current_searchbox[player_name]))
+	formspec[n+2] = string.format("image_button[%f,%f;%f,%f;ui_search_icon.png;searchbutton;]",
+		ui_peruser.page_buttons_x + ui_peruser.searchwidth, ui_peruser.page_buttons_y,
+		ui_peruser.btn_size,ui_peruser.btn_size)
+	formspec[n+3] = "tooltip[searchbutton;" ..F(S("Search")) .. "]"
+	formspec[n+4] = string.format("image_button[%f,%f;%f,%f;ui_reset_icon.png;searchresetbutton;]",
+		ui_peruser.page_buttons_x + ui_peruser.searchwidth + ui_peruser.btn_spc,
+		ui_peruser.page_buttons_y,
+		ui_peruser.btn_size, ui_peruser.btn_size)
+	formspec[n+5] = "tooltip[searchresetbutton;"..F(S("Reset search and display everything")).."]"
+
+	n = n + 6
+
+	-- Controls to flip items pages
+
+	local btnlist = {
+		{ "ui_skip_backward_icon.png", "start_list", S("First page") },
+		{ "ui_doubleleft_icon.png",    "rewind3",    S("Back three pages") },
+		{ "ui_left_icon.png",          "rewind1",    S("Back one page") },
+		{ "ui_right_icon.png",         "forward1",   S("Forward one page") },
+		{ "ui_doubleright_icon.png",   "forward3",   S("Forward three pages") },
+		{ "ui_skip_forward_icon.png",  "end_list",   S("Last page") },
+	}
+
+	if draw_lite_mode then
+		btnlist[5] = nil
+		btnlist[2] = nil
+	end
+
+	local bn = 0
+	for _, b in pairs(btnlist) do
+		formspec[n] =  string.format("image_button[%f,%f;%f,%f;%s;%s;]",
+			ui_peruser.page_buttons_x + ui_peruser.btn_spc*bn,
+			ui_peruser.page_buttons_y + ui_peruser.btn_spc,
+			ui_peruser.btn_size, ui_peruser.btn_size,
+			b[1],b[2])
+		formspec[n+1] = "tooltip["..b[2]..";"..F(b[3]).."]"
+		bn = bn + 1
+		n = n + 2
 	end
-	n = n+3
 
 	local no_matches = S("No matching items")
 	if draw_lite_mode then
@@ -210,23 +216,23 @@ function unified_inventory.get_formspec(player, page)
 	end
 
 	-- Items list
-	if #unified_inventory.filtered_items_list[player_name] == 0 then
-		formspec[n] = "label[8.2,"..ui_peruser.form_header_y..";" .. F(no_matches) .. "]"
+	if #ui.filtered_items_list[player_name] == 0 then
+		formspec[n] = "label["..ui_peruser.page_x..","..(ui_peruser.page_y+0.15)..";" .. F(no_matches) .. "]"
 	else
-		local dir = unified_inventory.active_search_direction[player_name]
-		local list_index = unified_inventory.current_index[player_name]
+		local dir = ui.active_search_direction[player_name]
+		local list_index = ui.current_index[player_name]
 		local page2 = math.floor(list_index / (ui_peruser.items_per_page) + 1)
 		local pagemax = math.floor(
-			(#unified_inventory.filtered_items_list[player_name] - 1)
+			(#ui.filtered_items_list[player_name] - 1)
 				/ (ui_peruser.items_per_page) + 1)
 		for y = 0, ui_peruser.pagerows - 1 do
 			for x = 0, ui_peruser.pagecols - 1 do
-				local name = unified_inventory.filtered_items_list[player_name][list_index]
+				local name = ui.filtered_items_list[player_name][list_index]
 				local item = minetest.registered_items[name]
 				if item then
 					-- Clicked on current item: Flip crafting direction
-					if name == unified_inventory.current_item[player_name] then
-						local cdir = unified_inventory.current_craft_direction[player_name]
+					if name == ui.current_item[player_name] then
+						local cdir = ui.current_craft_direction[player_name]
 						if cdir == "recipe" then
 							dir = "usage"
 						elseif cdir == "usage" then
@@ -234,13 +240,15 @@ function unified_inventory.get_formspec(player, page)
 						end
 					else
 					-- Default: use active search direction by default
-						dir = unified_inventory.active_search_direction[player_name]
+						dir = ui.active_search_direction[player_name]
 					end
 
 					local button_name = "item_button_" .. dir .. "_"
-						.. unified_inventory.mangle_for_formspec(name)
-					formspec[n] = ("item_image_button[%f,%f;.81,.81;%s;%s;]"):format(
-						8.2 + x * 0.7, ui_peruser.formspec_y + ui_peruser.page_y + y * 0.7,
+						.. ui.mangle_for_formspec(name)
+					formspec[n] = ("item_image_button[%f,%f;%f,%f;%s;%s;]"):format(
+						ui_peruser.page_x + x * ui_peruser.btn_spc,
+						ui_peruser.page_y + y * ui_peruser.btn_spc,
+						ui_peruser.btn_size, ui_peruser.btn_size,
 						name, button_name
 					)
 					formspec[n + 1] = ("tooltip[%s;%s \\[%s\\]]"):format(
@@ -252,26 +260,36 @@ function unified_inventory.get_formspec(player, page)
 				end
 			end
 		end
-		formspec[n] = "label[8.2,"..ui_peruser.form_header_y..";"..F(S("Page")) .. ": "
-			.. S("@1 of @2",page2,pagemax).."]"
+		formspec[n] = string.format("label[%f,%f;%s: %s]",
+			ui_peruser.page_buttons_x + ui_peruser.btn_spc * (draw_lite_mode and 1 or 2),
+			ui_peruser.page_buttons_y + 0.1 + ui_peruser.btn_spc * 2,
+			F(S("Page")), S("@1 of @2",page2,pagemax))
 	end
 	n= n+1
 
-	if unified_inventory.activefilter[player_name] ~= "" then
-		formspec[n] = "label[8.2,"..(ui_peruser.form_header_y + 0.4)..";" .. F(S("Filter")) .. ":]"
-		formspec[n+1] = "label[9.1,"..(ui_peruser.form_header_y + 0.4)..";"..F(unified_inventory.activefilter[player_name]).."]"
+	if ui.activefilter[player_name] ~= "" then
+		formspec[n] = string.format("label[%f,%f;%s: %s]",
+			ui_peruser.page_x, ui_peruser.page_y - 0.25,
+			F(S("Filter")), F(ui.activefilter[player_name]))
 	end
 	return table.concat(formspec, "")
 end
 
-function unified_inventory.set_inventory_formspec(player, page)
+function ui.set_inventory_formspec(player, page)
 	if player then
-		player:set_inventory_formspec(unified_inventory.get_formspec(player, page))
+		player:set_inventory_formspec(ui.get_formspec(player, page))
 	end
 end
 
+local function valid_def(def)
+	return (not def.groups.not_in_creative_inventory
+			or def.groups.not_in_creative_inventory == 0)
+		and def.description
+		and def.description ~= ""
+end
+
 --apply filter to the inventory list (create filtered copy of full one)
-function unified_inventory.apply_filter(player, filter, search_dir)
+function ui.apply_filter(player, filter, search_dir)
 	if not player then
 		return false
 	end
@@ -300,26 +318,43 @@ function unified_inventory.apply_filter(player, filter, search_dir)
 				or llocaldesc and string.find(llocaldesc, lfilter, 1, true)
 		end
 	end
-	unified_inventory.filtered_items_list[player_name]={}
-	for name, def in pairs(minetest.registered_items) do
-		if (not def.groups.not_in_creative_inventory
-			or def.groups.not_in_creative_inventory == 0)
-		and def.description
-		and def.description ~= ""
-		and ffilter(name, def) then
-			table.insert(unified_inventory.filtered_items_list[player_name], name)
+	ui.filtered_items_list[player_name]={}
+	local category = ui.current_category[player_name] or 'all'
+	if category == 'all' then
+		for name, def in pairs(minetest.registered_items) do
+			if valid_def(def)
+			and ffilter(name, def) then
+				table.insert(ui.filtered_items_list[player_name], name)
+			end
+		end
+	elseif category == 'uncategorized' then
+		for name, def in pairs(minetest.registered_items) do
+			if (not ui.find_category(name))
+			and valid_def(def)
+			and ffilter(name, def) then
+				table.insert(ui.filtered_items_list[player_name], name)
+			end
+		end
+	else
+		for name,exists in pairs(ui.registered_category_items[category]) do
+			local def = minetest.registered_items[name]
+			if exists and def
+			and valid_def(def)
+			and ffilter(name, def) then
+				table.insert(ui.filtered_items_list[player_name], name)
+			end
 		end
 	end
-	table.sort(unified_inventory.filtered_items_list[player_name])
-	unified_inventory.filtered_items_list_size[player_name] = #unified_inventory.filtered_items_list[player_name]
-	unified_inventory.current_index[player_name] = 1
-	unified_inventory.activefilter[player_name] = filter
-	unified_inventory.active_search_direction[player_name] = search_dir
-	unified_inventory.set_inventory_formspec(player,
-	unified_inventory.current_page[player_name])
+	table.sort(ui.filtered_items_list[player_name])
+	ui.filtered_items_list_size[player_name] = #ui.filtered_items_list[player_name]
+	ui.current_index[player_name] = 1
+	ui.activefilter[player_name] = filter
+	ui.active_search_direction[player_name] = search_dir
+	ui.set_inventory_formspec(player,
+	ui.current_page[player_name])
 end
 
-function unified_inventory.items_in_group(groups)
+function ui.items_in_group(groups)
 	local items = {}
 	for name, item in pairs(minetest.registered_items) do
 		for _, group in pairs(groups:split(',')) do
@@ -331,7 +366,7 @@ function unified_inventory.items_in_group(groups)
 	return items
 end
 
-function unified_inventory.sort_inventory(inv)
+function ui.sort_inventory(inv)
 	local inlist = inv:get_list("main")
 	local typecnt = {}
 	local typekeys = {}
diff --git a/unified_inventory/mod.conf b/unified_inventory/mod.conf
index 6894dd2..89be528 100644
--- a/unified_inventory/mod.conf
+++ b/unified_inventory/mod.conf
@@ -5,6 +5,4 @@ description = """
 Unified Inventory replaces the default survival and creative inventory.
 It adds a nicer interface and a number of features, such as a crafting guide.
 """
-release = 6744
-title = Unified Inventory
-author = RealBadAngel
+min_minetest_version = 5.4.0
diff --git a/unified_inventory/register.lua b/unified_inventory/register.lua
index cfc1d7d..3cb5f59 100644
--- a/unified_inventory/register.lua
+++ b/unified_inventory/register.lua
@@ -1,6 +1,7 @@
 local S = minetest.get_translator("unified_inventory")
 local NS = function(s) return s end
 local F = minetest.formspec_escape
+local ui = unified_inventory
 
 minetest.register_privilege("creative", {
 	description = S("Can use the creative inventory"),
@@ -12,10 +13,9 @@ minetest.register_privilege("ui_full", {
 	give_to_singleplayer = false,
 })
 
-
 local trash = minetest.create_detached_inventory("trash", {
 	--allow_put = function(inv, listname, index, stack, player)
-	--	if unified_inventory.is_creative(player:get_player_name()) then
+	--	if ui.is_creative(player:get_player_name()) then
 	--		return stack:get_count()
 	--	else
 	--		return 0
@@ -29,19 +29,19 @@ local trash = minetest.create_detached_inventory("trash", {
 })
 trash:set_size("main", 1)
 
-unified_inventory.register_button("craft", {
+ui.register_button("craft", {
 	type = "image",
 	image = "ui_craft_icon.png",
 	tooltip = S("Crafting Grid")
 })
 
-unified_inventory.register_button("craftguide", {
+ui.register_button("craftguide", {
 	type = "image",
 	image = "ui_craftguide_icon.png",
 	tooltip = S("Crafting Guide")
 })
 
-unified_inventory.register_button("home_gui_set", {
+ui.register_button("home_gui_set", {
 	type = "image",
 	image = "ui_sethome_icon.png",
 	tooltip = S("Set home position"),
@@ -49,8 +49,8 @@ unified_inventory.register_button("home_gui_set", {
 	action = function(player)
 		local player_name = player:get_player_name()
 		if minetest.check_player_privs(player_name, {home=true}) then
-			unified_inventory.set_home(player, player:get_pos())
-			local home = unified_inventory.home_pos[player_name]
+			ui.set_home(player, player:get_pos())
+			local home = ui.home_pos[player_name]
 			if home ~= nil then
 				minetest.sound_play("dingdong",
 						{to_player=player_name, gain = 1.0})
@@ -60,7 +60,7 @@ unified_inventory.register_button("home_gui_set", {
 		else
 			minetest.chat_send_player(player_name,
 				S("You don't have the \"home\" privilege!"))
-			unified_inventory.set_inventory_formspec(player, unified_inventory.current_page[player_name])
+			ui.set_inventory_formspec(player, ui.current_page[player_name])
 		end
 	end,
 	condition = function(player)
@@ -68,7 +68,7 @@ unified_inventory.register_button("home_gui_set", {
 	end,
 })
 
-unified_inventory.register_button("home_gui_go", {
+ui.register_button("home_gui_go", {
 	type = "image",
 	image = "ui_gohome_icon.png",
 	tooltip = S("Go home"),
@@ -76,13 +76,13 @@ unified_inventory.register_button("home_gui_go", {
 	action = function(player)
 		local player_name = player:get_player_name()
 		if minetest.check_player_privs(player_name, {home=true}) then
-			if unified_inventory.go_home(player) then
+			if ui.go_home(player) then
 				minetest.sound_play("teleport", {to_player = player_name})
 			end
 		else
 			minetest.chat_send_player(player_name,
 				S("You don't have the \"home\" privilege!"))
-			unified_inventory.set_inventory_formspec(player, unified_inventory.current_page[player_name])
+			ui.set_inventory_formspec(player, ui.current_page[player_name])
 		end
 	end,
 	condition = function(player)
@@ -90,7 +90,7 @@ unified_inventory.register_button("home_gui_go", {
 	end,
 })
 
-unified_inventory.register_button("misc_set_day", {
+ui.register_button("misc_set_day", {
 	type = "image",
 	image = "ui_sun_icon.png",
 	tooltip = S("Set time to day"),
@@ -106,7 +106,7 @@ unified_inventory.register_button("misc_set_day", {
 		else
 			minetest.chat_send_player(player_name,
 				S("You don't have the settime privilege!"))
-			unified_inventory.set_inventory_formspec(player, unified_inventory.current_page[player_name])
+			ui.set_inventory_formspec(player, ui.current_page[player_name])
 		end
 	end,
 	condition = function(player)
@@ -114,7 +114,7 @@ unified_inventory.register_button("misc_set_day", {
 	end,
 })
 
-unified_inventory.register_button("misc_set_night", {
+ui.register_button("misc_set_night", {
 	type = "image",
 	image = "ui_moon_icon.png",
 	tooltip = S("Set time to night"),
@@ -130,7 +130,7 @@ unified_inventory.register_button("misc_set_night", {
 		else
 			minetest.chat_send_player(player_name,
 					S("You don't have the settime privilege!"))
-			unified_inventory.set_inventory_formspec(player, unified_inventory.current_page[player_name])
+			ui.set_inventory_formspec(player, ui.current_page[player_name])
 		end
 	end,
 	condition = function(player)
@@ -138,19 +138,19 @@ unified_inventory.register_button("misc_set_night", {
 	end,
 })
 
-unified_inventory.register_button("clear_inv", {
+ui.register_button("clear_inv", {
 	type = "image",
 	image = "ui_trash_icon.png",
 	tooltip = S("Clear inventory"),
 	action = function(player)
 		local player_name = player:get_player_name()
-		if not unified_inventory.is_creative(player_name) then
+		if not ui.is_creative(player_name) then
 			minetest.chat_send_player(player_name,
 					S("This button has been disabled outside"
 					.." of creative mode to prevent"
 					.." accidental inventory trashing."
 					.."\nUse the trash slot instead."))
-			unified_inventory.set_inventory_formspec(player, unified_inventory.current_page[player_name])
+			ui.set_inventory_formspec(player, ui.current_page[player_name])
 			return
 		end
 		player:get_inventory():set_list("main", {})
@@ -159,35 +159,42 @@ unified_inventory.register_button("clear_inv", {
 				{to_player=player_name, gain = 1.0})
 	end,
 	condition = function(player)
-		return unified_inventory.is_creative(player:get_player_name())
+		return ui.is_creative(player:get_player_name())
 	end,
 })
 
-unified_inventory.register_page("craft", {
+ui.register_page("craft", {
 	get_formspec = function(player, perplayer_formspec)
 
-		local formspecy = perplayer_formspec.formspec_y
-		local formheadery =  perplayer_formspec.form_header_y
+		local formheaderx = perplayer_formspec.form_header_x
+		local formheadery = perplayer_formspec.form_header_y
+		local craftx = perplayer_formspec.craft_x
+		local crafty = perplayer_formspec.craft_y
 
 		local player_name = player:get_player_name()
-		local formspec = "background[2,"..formspecy..";6,3;ui_crafting_form.png]"
-		formspec = formspec..string.gsub(unified_inventory.standard_inv_bg, "YYY", (formspecy + 3.4))
-		formspec = formspec.."label[0,"..formheadery..";" ..F(S("Crafting")).."]"
-		formspec = formspec.."listcolors[#00000000;#00000000]"
-		formspec = formspec.."list[current_player;craftpreview;6,"..formspecy..";1,1;]"
-		formspec = formspec.."list[current_player;craft;2,"..formspecy..";3,3;]"
-		if unified_inventory.trash_enabled or unified_inventory.is_creative(player_name) or minetest.get_player_privs(player_name).give then
-			formspec = formspec.."label[7,"..(formspecy + 1.5)..";" .. F(S("Trash:")) .. "]"
-			formspec = formspec.."background[7,"..(formspecy + 2)..";1,1;ui_single_slot.png]"
-			formspec = formspec.."list[detached:trash;main;7,"..(formspecy + 2)..";1,1;]"
+		local formspec = {
+			perplayer_formspec.standard_inv_bg,
+			perplayer_formspec.craft_grid,
+			"label["..formheaderx..","..formheadery..";" ..F(S("Crafting")).."]",
+			"listcolors[#00000000;#00000000]",
+			"listring[current_name;craft]",
+			"listring[current_player;main]"
+		}
+		local n=#formspec+1
+
+		if ui.trash_enabled or ui.is_creative(player_name) or minetest.get_player_privs(player_name).give then
+			formspec[n] = string.format("label[%f,%f;%s]", craftx + 6.45, crafty + 2.4, F(S("Trash:")))
+			formspec[n+1] = ui.make_trash_slot(craftx + 6.25, crafty + 2.5)
+			n=n + 2
 		end
-		formspec = formspec.."listring[current_name;craft]"
-		formspec = formspec.."listring[current_player;main]"
-		if unified_inventory.is_creative(player_name) then
-			formspec = formspec.."label[0,"..(formspecy + 1.5)..";" .. F(S("Refill:")) .. "]"
-			formspec = formspec.."list[detached:"..F(player_name).."refill;main;0,"..(formspecy +2)..";1,1;]"
+
+		if ui.is_creative(player_name) then
+			formspec[n] = ui.single_slot(craftx - 2.5, crafty + 2.5)
+			formspec[n+1] = string.format("label[%f,%f;%s]", craftx - 2.3, crafty + 2.4,F(S("Refill:")))
+			formspec[n+2] = string.format("list[detached:%srefill;main;%f,%f;1,1;]",
+				F(player_name), craftx - 2.5 + ui.list_img_offset, crafty + 2.5 + ui.list_img_offset)
 		end
-		return {formspec=formspec}
+		return {formspec=table.concat(formspec)}
 	end,
 })
 
@@ -206,18 +213,18 @@ local function stack_image_button(x, y, w, h, buttonname_prefix, item)
 	local selectitem = name
 	if name:sub(1, 6) == "group:" then
 		local group_name = name:sub(7)
-		local group_item = unified_inventory.get_group_item(group_name)
+		local group_item = ui.get_group_item(group_name)
 		show_is_group = not group_item.sole
 		displayitem = group_item.item or "unknown"
 		selectitem = group_item.sole and displayitem or name
 	end
 	local label = show_is_group and "G" or ""
-	local buttonname = F(buttonname_prefix..unified_inventory.mangle_for_formspec(selectitem))
+	local buttonname = F(buttonname_prefix..ui.mangle_for_formspec(selectitem))
 	local button = string.format("item_image_button[%f,%f;%f,%f;%s;%s;%s]",
 			x, y, w, h,
 			F(displayitem), buttonname, label)
 	if show_is_group then
-		local groupstring, andcount = unified_inventory.extract_groupnames(name)
+		local groupstring, andcount = ui.extract_groupnames(name)
 		local grouptip
 		if andcount == 1 then
 			grouptip = S("Any item belonging to the @1 group", groupstring)
@@ -257,26 +264,33 @@ local other_dir = {
 	usage = "recipe",
 }
 
-unified_inventory.register_page("craftguide", {
+ui.register_page("craftguide", {
 	get_formspec = function(player, perplayer_formspec)
 
-		local formspecy =    perplayer_formspec.formspec_y
-		local formheadery =  perplayer_formspec.form_header_y
-		local craftresultx = perplayer_formspec.craft_result_x
-		local craftresulty = perplayer_formspec.craft_result_y
+		local craftguidex =       perplayer_formspec.craft_guide_x
+		local craftguidey =       perplayer_formspec.craft_guide_y
+		local craftguidearrowx =  perplayer_formspec.craft_guide_arrow_x
+		local craftguideresultx = perplayer_formspec.craft_guide_result_x
+		local formheaderx =       perplayer_formspec.form_header_x
+		local formheadery =       perplayer_formspec.form_header_y
+		local give_x =            perplayer_formspec.give_btn_x
 
 		local player_name = player:get_player_name()
 		local player_privs = minetest.get_player_privs(player_name)
-		local fs = {
-			string.gsub(unified_inventory.standard_inv_bg, "YYY", (formspecy + 3.4)),
-			"label[0,"..formheadery..";" .. F(S("Crafting Guide")) .. "]",
+
+		local formspec = {
+			perplayer_formspec.standard_inv_bg,
+			"label["..formheaderx..","..formheadery..";" .. F(S("Crafting Guide")) .. "]",
 			"listcolors[#00000000;#00000000]"
 		}
-		local item_name = unified_inventory.current_item[player_name]
+
+		local item_name = ui.current_item[player_name]
 		if not item_name then
-			return { formspec = table.concat(fs) }
+			return { formspec = table.concat(formspec) }
 		end
 
+		local n = 4
+
 		local item_name_shown
 		if minetest.registered_items[item_name]
 				and minetest.registered_items[item_name].description then
@@ -286,51 +300,60 @@ unified_inventory.register_page("craftguide", {
 			item_name_shown = item_name
 		end
 
-		local dir = unified_inventory.current_craft_direction[player_name]
+		local dir = ui.current_craft_direction[player_name]
 		local rdir = dir == "recipe" and "usage" or "recipe"
 
-		local crafts = unified_inventory.crafts_for[dir][item_name]
-		local alternate = unified_inventory.alternate[player_name]
+		local crafts = ui.crafts_for[dir][item_name]
+		local alternate = ui.alternate[player_name]
 		local alternates, craft
 		if crafts and #crafts > 0 then
 			alternates = #crafts
 			craft = crafts[alternate]
 		end
-		local has_give = player_privs.give or unified_inventory.is_creative(player_name)
+		local has_give = player_privs.give or ui.is_creative(player_name)
 
-		fs[#fs + 1] = "background[0.5,"..(formspecy + 0.2)..";8,3;ui_craftguide_form.png]"
-		fs[#fs + 1] = string.format("textarea[%f,%f;10,1;;%s: %s;]",
-				craftresultx, craftresulty, F(role_text[dir]), item_name_shown)
-		fs[#fs + 1] = stack_image_button(0, formspecy, 1.1, 1.1,
-				"item_button_" .. rdir .. "_", ItemStack(item_name))
+		formspec[n] = string.format("image[%f,%f;%f,%f;ui_crafting_arrow.png]",
+	                            craftguidearrowx, craftguidey, ui.imgscale, ui.imgscale)
+
+		formspec[n+1] = string.format("textarea[%f,%f;10,1;;%s: %s;]",
+				perplayer_formspec.craft_guide_resultstr_x, perplayer_formspec.craft_guide_resultstr_y,
+				F(role_text[dir]), item_name_shown)
+		n = n + 2
+
+		local giveme_form = table.concat({
+			"label[".. (give_x+0.1)..",".. (craftguidey + 2.7) .. ";" .. F(S("Give me:")) .. "]",
+			"button["..(give_x)..","..     (craftguidey + 2.9) .. ";0.75,0.5;craftguide_giveme_1;1]",
+			"button["..(give_x+0.8)..",".. (craftguidey + 2.9) .. ";0.75,0.5;craftguide_giveme_10;10]",
+			"button["..(give_x+1.6)..",".. (craftguidey + 2.9) .. ";0.75,0.5;craftguide_giveme_99;99]"
+		})
 
 		if not craft then
 			-- No craft recipes available for this item.
-			fs[#fs + 1] = "label[5.5,"..(formspecy + 2.35)..";"
-					.. F(no_recipe_text[dir]) .. "]"
-			local no_pos = dir == "recipe" and 4.5 or 6.5
-			local item_pos = dir == "recipe" and 6.5 or 4.5
-			fs[#fs + 1] = "image["..no_pos..","..formspecy..";1.1,1.1;ui_no.png]"
-			fs[#fs + 1] = stack_image_button(item_pos, formspecy, 1.1, 1.1,
+			formspec[n] = string.format("label[%f,%f;%s]", craftguidex+2.5, craftguidey+1.5, F(no_recipe_text[dir]))
+			local no_pos = dir == "recipe" and (craftguidex+2.5) or craftguideresultx
+			local item_pos = dir == "recipe" and craftguideresultx or (craftguidex+2.5)
+			formspec[n+1] = "image["..no_pos..","..craftguidey..";1.2,1.2;ui_no.png]"
+			formspec[n+2] = stack_image_button(item_pos, craftguidey, 1.2, 1.2,
 				"item_button_" .. other_dir[dir] .. "_", ItemStack(item_name))
 			if has_give then
-				fs[#fs + 1] = "label[0," .. (formspecy + 2.10) .. ";" .. F(S("Give me:")) .. "]"
-						.. "button[0,  " .. (formspecy + 2.7) .. ";0.6,0.5;craftguide_giveme_1;1]"
-						.. "button[0.6," .. (formspecy + 2.7) .. ";0.7,0.5;craftguide_giveme_10;10]"
-						.. "button[1.3," .. (formspecy + 2.7) .. ";0.8,0.5;craftguide_giveme_99;99]"
+				formspec[n+3] = giveme_form
 			end
-			return { formspec = table.concat(fs) }
+			return { formspec = table.concat(formspec) }
+		else
+			formspec[n] = stack_image_button(craftguideresultx, craftguidey, 1.2, 1.2,
+					"item_button_" .. rdir .. "_", ItemStack(craft.output))
+			n = n + 1
 		end
 
-		local craft_type = unified_inventory.registered_craft_types[craft.type] or
-				unified_inventory.craft_type_defaults(craft.type, {})
+		local craft_type = ui.registered_craft_types[craft.type] or
+				ui.craft_type_defaults(craft.type, {})
 		if craft_type.icon then
-			fs[#fs + 1] = string.format("image[%f,%f;%f,%f;%s]",
-					5.7, (formspecy + 0.05), 0.5, 0.5, craft_type.icon)
+			formspec[n] = string.format("image[%f,%f;%f,%f;%s]",
+					craftguidearrowx+0.35, craftguidey, 0.5, 0.5, craft_type.icon)
+			n = n + 1
 		end
-		fs[#fs + 1] = "label[5.5,"..(formspecy + 1)..";" .. F(craft_type.description).."]"
-		fs[#fs + 1] = stack_image_button(6.5, formspecy, 1.1, 1.1,
-				"item_button_usage_", ItemStack(craft.output))
+		formspec[n] = string.format("label[%f,%f;%s]", craftguidearrowx + 0.15, craftguidey + 1.4, F(craft_type.description))
+		n = n + 1
 
 		local display_size = craft_type.dynamic_display_size
 				and craft_type.dynamic_display_size(craft)
@@ -341,11 +364,12 @@ unified_inventory.register_page("craftguide", {
 
 		-- This keeps recipes aligned to the right,
 		-- so that they're close to the arrow.
-		local xoffset = 5.5
+		local xoffset = craftguidex+3.75
+		local bspc = 1.25
 		-- Offset factor for crafting grids with side length > 4
 		local of = (3/math.max(3, math.max(display_size.width, display_size.height)))
 		local od = 0
-		-- Minimum grid size at which size optimazation measures kick in
+		-- Minimum grid size at which size optimization measures kick in
 		local mini_craft_size = 6
 		if display_size.width >= mini_craft_size then
 			od = math.max(1, display_size.width - 2)
@@ -354,12 +378,12 @@ unified_inventory.register_page("craftguide", {
 		-- Size modifier factor
 		local sf = math.min(1, of * (1.05 + 0.05*od))
 		-- Button size
-		local bsize_h = 1.1 * sf
-		local bsize_w = bsize_h
-		if display_size.width >= mini_craft_size then
-			bsize_w = 1.175 * sf
+		local bsize = 1.2 * sf
+
+		if display_size.width >= mini_craft_size then  -- it's not a normal 3x3 grid
+			bsize = 0.8 * sf
 		end
-		if (bsize_h > 0.35 and display_size.width) then
+		if (bsize > 0.35 and display_size.width) then
 		for y = 1, display_size.height do
 		for x = 1, display_size.width do
 			local item
@@ -369,48 +393,53 @@ unified_inventory.register_page("craftguide", {
 			-- Flipped x, used to build formspec buttons from right to left
 			local fx = display_size.width - (x-1)
 			-- x offset, y offset
-			local xof = (fx-1) * of + of
-			local yof = (y-1) * of + 1
+			local xof = ((fx-1) * of + of) * bspc
+			local yof = ((y-1) * of + 1) * bspc
 			if item then
-				fs[#fs + 1] = stack_image_button(
-						xoffset - xof, formspecy - 1 + yof, bsize_w, bsize_h,
+				formspec[n] = stack_image_button(
+						xoffset - xof, craftguidey - 1.25 + yof, bsize, bsize,
 						"item_button_recipe_",
 						ItemStack(item))
 			else
 				-- Fake buttons just to make grid
-				fs[#fs + 1] = string.format("image_button[%f,%f;%f,%f;ui_blank_image.png;;]",
-						xoffset - xof, formspecy - 1 + yof, bsize_w, bsize_h)
+				formspec[n] = string.format("image_button[%f,%f;%f,%f;ui_blank_image.png;;]",
+						xoffset - xof, craftguidey - 1.25 + yof, bsize, bsize)
 			end
+			n = n + 1
 		end
 		end
 		else
 			-- Error
-			fs[#fs + 1] = string.format("label[2,%f;%s]",
-				formspecy, F(S("This recipe is too@nlarge to be displayed.")))
+			formspec[n] = string.format("label[2,%f;%s]",
+				craftguidey, F(S("This recipe is too@nlarge to be displayed.")))
+			n = n + 1
 		end
 
 		if craft_type.uses_crafting_grid and display_size.width <= 3 then
-			fs[#fs + 1] = "label[0," .. (formspecy + 0.9) .. ";" .. F(S("To craft grid:")) .. "]"
-					.. "button[0,  " .. (formspecy + 1.5) .. ";0.6,0.5;craftguide_craft_1;1]"
-					.. "button[0.6," .. (formspecy + 1.5) .. ";0.7,0.5;craftguide_craft_10;10]"
-					.. "button[1.3," .. (formspecy + 1.5) .. ";0.8,0.5;craftguide_craft_max;" .. F(S("All")) .. "]"
+			formspec[n]   = "label["..(give_x+0.1)..","..    (craftguidey + 1.7) .. ";" .. F(S("To craft grid:")) .. "]"
+			formspec[n+1] = "button["..  (give_x)..","..     (craftguidey + 1.9) .. ";0.75,0.5;craftguide_craft_1;1]"
+			formspec[n+2] = "button["..  (give_x+0.8)..",".. (craftguidey + 1.9) .. ";0.75,0.5;craftguide_craft_10;10]"
+			formspec[n+3] = "button["..  (give_x+1.6)..",".. (craftguidey + 1.9) .. ";0.75,0.5;craftguide_craft_max;" .. F(S("All")) .. "]"
+			n = n + 4
 		end
+
 		if has_give then
-			fs[#fs + 1] = "label[0," .. (formspecy + 2.1) .. ";" .. F(S("Give me:")) .. "]"
-					.. "button[0,  " .. (formspecy + 2.7) .. ";0.6,0.5;craftguide_giveme_1;1]"
-					.. "button[0.6," .. (formspecy + 2.7) .. ";0.7,0.5;craftguide_giveme_10;10]"
-					.. "button[1.3," .. (formspecy + 2.7) .. ";0.8,0.5;craftguide_giveme_99;99]"
+			formspec[n] = giveme_form
+			n = n + 1
 		end
 
 		if alternates and alternates > 1 then
-			fs[#fs + 1] = "label[5.5," .. (formspecy + 1.6) .. ";"
-					.. F(S(recipe_text[dir], alternate, alternates)) .. "]"
-					.. "image_button[5.5," .. (formspecy + 2) .. ";1,1;ui_left_icon.png;alternate_prev;]"
-					.. "image_button[6.5," .. (formspecy + 2) .. ";1,1;ui_right_icon.png;alternate;]"
-					.. "tooltip[alternate_prev;" .. F(prev_alt_text[dir]) .. "]"
-					.. "tooltip[alternate;" .. F(next_alt_text[dir]) .. "]"
+			formspec[n] = string.format("label[%f,%f;%s]",
+						craftguidex+4, craftguidey + 2.3, F(S(recipe_text[dir], alternate, alternates)))
+			formspec[n+1] = string.format("image_button[%f,%f;1.1,1.1;ui_left_icon.png;alternate_prev;]",
+						craftguidearrowx+0.2, craftguidey + 2.6)
+			formspec[n+2] = string.format("image_button[%f,%f;1.1,1.1;ui_right_icon.png;alternate;]",
+						craftguidearrowx+1.35, craftguidey + 2.6)
+			formspec[n+3] = "tooltip[alternate_prev;" .. F(prev_alt_text[dir]) .. "]"
+			formspec[n+4] = "tooltip[alternate;" .. F(next_alt_text[dir]) .. "]"
 		end
-		return { formspec = table.concat(fs) }
+
+		return { formspec = table.concat(formspec) }
 	end,
 })
 
@@ -418,7 +447,7 @@ local function craftguide_giveme(player, formname, fields)
 	local player_name = player:get_player_name()
 	local player_privs = minetest.get_player_privs(player_name)
 	if not player_privs.give and
-			not unified_inventory.is_creative(player_name) then
+			not ui.is_creative(player_name) then
 		minetest.log("action", "[unified_inventory] Denied give action to player " ..
 			player_name)
 		return
@@ -433,7 +462,7 @@ local function craftguide_giveme(player, formname, fields)
 	amount = tonumber(amount) or 0
 	if amount == 0 then return end
 
-	local output = unified_inventory.current_item[player_name]
+	local output = ui.current_item[player_name]
 	if (not output) or (output == "") then return end
 
 	local player_inv = player:get_inventory()
@@ -454,21 +483,21 @@ local function craftguide_craft(player, formname, fields)
 
 	local player_name = player:get_player_name()
 
-	local output = unified_inventory.current_item[player_name] or ""
+	local output = ui.current_item[player_name] or ""
 	if output == "" then return end
 
-	local crafts = unified_inventory.crafts_for[
-		unified_inventory.current_craft_direction[player_name]][output] or {}
+	local crafts = ui.crafts_for[
+		ui.current_craft_direction[player_name]][output] or {}
 	if #crafts == 0 then return end
 
-	local alternate = unified_inventory.alternate[player_name]
+	local alternate = ui.alternate[player_name]
 
 	local craft = crafts[alternate]
 	if craft.width > 3 then return end
 
-	unified_inventory.craftguide_match_craft(player, "main", "craft", craft, amount)
+	ui.craftguide_match_craft(player, "main", "craft", craft, amount)
 
-	unified_inventory.set_inventory_formspec(player, "craft")
+	ui.set_inventory_formspec(player, "craft")
 end
 
 minetest.register_on_player_receive_fields(function(player, formname, fields)
diff --git a/unified_inventory/settingtypes.txt b/unified_inventory/settingtypes.txt
index 910989f..27768ac 100644
--- a/unified_inventory/settingtypes.txt
+++ b/unified_inventory/settingtypes.txt
@@ -9,3 +9,6 @@ unified_inventory_bags (Enable bags) bool true
 #If enabled, the trash slot can be used by those without both creative
 #and the give privilege.
 unified_inventory_trash (Enable trash) bool true
+
+
+unified_inventory_automatic_categorization (Items automatically added to categories) bool true
\ No newline at end of file
diff --git a/unified_inventory/waypoints.lua b/unified_inventory/waypoints.lua
index 97712b7..2a8ead4 100644
--- a/unified_inventory/waypoints.lua
+++ b/unified_inventory/waypoints.lua
@@ -1,5 +1,6 @@
 local S = minetest.get_translator("unified_inventory")
 local F = minetest.formspec_escape
+local ui = unified_inventory
 
 local hud_colors = {
 	{"#FFFFFF", 0xFFFFFF, S("White")},
@@ -14,28 +15,38 @@ local hud_colors_max = #hud_colors
 -- Stores temporary player data (persists until player leaves)
 local waypoints_temp = {}
 
-unified_inventory.register_page("waypoints", {
+ui.register_page("waypoints", {
 	get_formspec = function(player)
 		local player_name = player:get_player_name()
+		local wp_info_x = ui.style_full.form_header_x + 1.25
+		local wp_info_y = ui.style_full.form_header_y + 0.5
+		local wp_bottom_row = ui.style_full.std_inv_y - 1
+		local wp_buttons_rj = ui.style_full.std_inv_x + 10.1 - ui.style_full.btn_spc
+		local wp_edit_w = ui.style_full.btn_spc * 4 - 0.1
 
 		-- build a "fake" temp entry if the server took too long
 		-- during sign-on and returned an empty entry
 		if not waypoints_temp[player_name] then waypoints_temp[player_name] = {hud = 1} end
 
 		local waypoints = datastorage.get(player_name, "waypoints")
-		local formspec = string.gsub(unified_inventory.standard_inv_bg, "YYY", "4.4") ..
-			"image[0,0;1,1;ui_waypoints_icon.png]" ..
-			"label[1,0;" .. F(S("Waypoints")) .. "]"
+		local formspec = { ui.style_full.standard_inv_bg,
+			string.format("label[%f,%f;%s]",
+				ui.style_full.form_header_x, ui.style_full.form_header_y,
+				F(S("Waypoints"))),
+			"image["..wp_info_x..","..wp_info_y..";1,1;ui_waypoints_icon.png]"
+		}
+		local n=4
 
 		-- Tabs buttons:
-		for i = 1, 5, 1 do
-			formspec = formspec ..
-				"image_button[0.0," .. 0.2 + i * 0.7 .. ";.8,.8;" ..
-				(i == waypoints.selected and "ui_blue_icon_background.png^" or "") ..
-				"ui_" .. i .. "_icon.png;" ..
-				"select_waypoint" .. i .. ";]" ..
-				"tooltip[select_waypoint" .. i .. ";"
-					.. S("Select Waypoint #@1", i).."]"
+		for i = 1, 5 do
+			local sw="select_waypoint"..i
+			formspec[n] = string.format("image_button[%f,%f;%f,%f;%sui_%i_icon.png;%s;]",
+				ui.style_full.main_button_x, wp_bottom_row - (5-i) * ui.style_full.btn_spc,
+				ui.style_full.btn_size, ui.style_full.btn_size,
+				(i == waypoints.selected) and "ui_blue_icon_background.png^" or "",
+				i, sw)
+			formspec[n+1] = "tooltip["..sw..";"..S("Select Waypoint #@1", i).."]"
+			n = n + 2
 		end
 
 		local i = waypoints.selected or 1
@@ -44,72 +55,58 @@ unified_inventory.register_page("waypoints", {
 		local default_name = S("Waypoint @1", i)
 
 		-- Main buttons:
-		formspec = formspec ..
-			"image_button[4.5,3.7;.8,.8;"..
-			"ui_waypoint_set_icon.png;"..
-			"set_waypoint"..i..";]"..
-			"tooltip[set_waypoint" .. i .. ";"
-				.. F(S("Set waypoint to current location")).."]"
+		local btnlist = {
+			{ "ui_waypoint_set_icon.png", "set_waypoint", S("Set waypoint to current location") },
+			{ waypoint.active and "ui_on_icon.png" or "ui_off_icon.png", "toggle_waypoint", S("Make waypoint @1", waypoint.active and "invisible" or "visible") },
+			{ waypoint.display_pos and "ui_green_icon_background.png^ui_xyz_icon.png" or "ui_red_icon_background.png^ui_xyz_icon.png^(ui_no.png^[transformR90)", "toggle_display_pos", S("@1 display of waypoint coordinates", waypoint.display_pos and "Disable" or "Enable") },
+			{ "ui_circular_arrows_icon.png", "toggle_color", S("Change color of waypoint display") },
+			{ "ui_pencil_icon.png", "rename_waypoint", S("Edit waypoint name") }
+		}
 
-		formspec = formspec ..
-			"image_button[5.2,3.7;.8,.8;"..
-			(waypoint.active and "ui_on_icon.png" or "ui_off_icon.png")..";"..
-			"toggle_waypoint"..i..";]"..
-			"tooltip[toggle_waypoint" .. i .. ";"
-				.. F(S("Make waypoint @1",
-					waypoint.active and S("invisible") or S("visible"))).."]"
-
-		formspec = formspec ..
-			"image_button[5.9,3.7;.8,.8;"..
-			(waypoint.display_pos and "ui_green_icon_background.png" or "ui_red_icon_background.png").."^ui_xyz_icon.png;"..
-			"toggle_display_pos" .. i .. ";]"..
-			"tooltip[toggle_display_pos" .. i .. ";"
-				.. F(S("@1 display of waypoint coordinates",
-					waypoint.display_pos and S("Disable") or S("Enable"))) .."]"
-
-		formspec = formspec ..
-			"image_button[6.6,3.7;.8,.8;"..
-			"ui_circular_arrows_icon.png;"..
-			"toggle_color"..i..";]"..
-			"tooltip[toggle_color" .. i .. ";"
-				.. F(S("Change color of waypoint display")).."]"
-
-		formspec = formspec ..
-			"image_button[7.3,3.7;.8,.8;"..
-			"ui_pencil_icon.png;"..
-			"rename_waypoint"..i..";]"..
-			"tooltip[rename_waypoint" .. i .. ";"
-				.. F(S("Edit waypoint name")).."]"
+		local x = 4
+		for _, b in pairs(btnlist) do
+			formspec[n] = string.format("image_button[%f,%f;%f,%f;%s;%s%i;]",
+				wp_buttons_rj - ui.style_full.btn_spc * x, wp_bottom_row,
+				ui.style_full.btn_size, ui.style_full.btn_size,
+				b[1], b[2], i)
+			formspec[n+1] = "tooltip["..b[2]..i..";"..F(b[3]).."]"
+			x = x - 1
+			n = n + 2
+		end
 
 		-- Waypoint's info:
+		formspec[n] = "label["..wp_info_x..","..(wp_info_y+1.1)..";"
 		if waypoint.active then
-			formspec = formspec .. 	"label[1,0.8;"..F(S("Waypoint active")).."]"
+			formspec[n+1] = F(S("Waypoint active")).."]"
 		else
-			formspec = formspec .. 	"label[1,0.8;"..F(S("Waypoint inactive")).."]"
+			formspec[n+1] = F(S("Waypoint inactive")).."]"
 		end
+		n = n + 2
 
 		if temp.edit then
-			formspec = formspec ..
-				"field[1.3,3.2;6,.8;rename_box" .. i .. ";;"
-				..(waypoint.name or default_name).."]" ..
-				"image_button[7.3,2.9;.8,.8;"..
-				"ui_ok_icon.png;"..
-				"confirm_rename"..i.. ";]"..
-				"tooltip[confirm_rename" .. i .. ";"
-					.. F(S("Finish editing")).."]"
+			formspec[n] = string.format("field[%f,%f;%f,%f;rename_box%i;;%s]",
+				wp_buttons_rj - wp_edit_w - 0.1, wp_bottom_row - ui.style_full.btn_spc,
+				wp_edit_w, ui.style_full.btn_size, i, (waypoint.name or default_name))
+			formspec[n+1] = string.format("image_button[%f,%f;%f,%f;ui_ok_icon.png;confirm_rename%i;]",
+				wp_buttons_rj, wp_bottom_row - ui.style_full.btn_spc,
+				ui.style_full.btn_size, ui.style_full.btn_size, i)
+			formspec[n+2] = "tooltip[confirm_rename"..i..";"..F(S("Finish editing")).."]"
+			n = n + 3
 		end
 
-		formspec = formspec .. "label[1,1.3;"..F(S("World position"))..": " ..
-			minetest.pos_to_string(waypoint.world_pos or vector.new()) .. "]" ..
-			"label[1,1.8;"..F(S("Name"))..": ".. (waypoint.name or default_name) .. "]" ..
-			"label[1,2.3;"..F(S("HUD text color"))..": " ..
-			hud_colors[waypoint.color or 1][3] .. "]"
+		formspec[n] = string.format("label[%f,%f;%s: %s]",
+			wp_info_x, wp_info_y+1.6, F(S("World position")),
+			minetest.pos_to_string(waypoint.world_pos or vector.new()))
+		formspec[n+1] = string.format("label[%f,%f;%s: %s]",
+			wp_info_x, wp_info_y+2.10, F(S("Name")), (waypoint.name or default_name))
+		formspec[n+2] = string.format("label[%f,%f;%s: %s]",
+			wp_info_x, wp_info_y+2.60, F(S("HUD text color")), hud_colors[waypoint.color or 1][3])
 
-		return {formspec=formspec}
+		return {formspec=table.concat(formspec)}
 	end,
 })
 
-unified_inventory.register_button("waypoints", {
+ui.register_button("waypoints", {
 	type = "image",
 	image = "ui_waypoints_icon.png",
 	tooltip = S("Waypoints"),
@@ -224,7 +221,7 @@ minetest.register_on_player_receive_fields(function(player, formname, fields)
 			update_hud(player, waypoints, temp, i)
 		end
 		if update_formspec then
-			unified_inventory.set_inventory_formspec(player, "waypoints")
+			ui.set_inventory_formspec(player, "waypoints")
 		end
 		if hit then return end
 	end