diff --git a/API.md b/API.md
index 8a54d9f..3541ee5 100644
--- a/API.md
+++ b/API.md
@@ -38,7 +38,7 @@ i3.new_tab {
 
 Updates the current formspec. `extra_formspec` adds an additional formspec string.
 
-#### `i3.delete_tab(tabname)`
+#### `i3.remove_tab(tabname)`
 
 Deletes a tab by name.
 
@@ -141,7 +141,7 @@ Recipes can be registered from a given URL containing a JSON file (HTTP support
 
 ```Lua
 i3.register_craft({
-	url = "https://raw.githubusercontent.com/minetest-mods/i3/main/test_online_recipe.json"
+	url = "https://raw.githubusercontent.com/minetest-mods/i3/main/tests/test_online_recipe.json"
 })
 ```
 
@@ -178,7 +178,7 @@ end)
 
 Removes all recipe filters and adds a new one.
 
-#### `i3.delete_recipe_filter(name)`
+#### `i3.remove_recipe_filter(name)`
 
 Removes the recipe filter with the given `name`.
 
@@ -197,12 +197,12 @@ They can be used like so: `<optional_name> +<filter name>=<value1>,<value2>,<...
 Example usages:
 
 - `+groups=cracky,crumbly`: search for groups `cracky` and `crumbly` in all items.
-- `wood +groups=flammable +types=node`: search for group `flammable` amongst items which contain
-  `wood` in their names AND have a `node` drawtype.
+- `wood +groups=flammable`: search for group `flammable` amongst items which contain
+  `wood` in their names.
 
 Notes:
 - If `optional_name` is omitted, the search filter will apply to all items, without pre-filtering.
-- The `+groups` and `+types` filters are currently implemented by default.
+- The `+groups` filter is currently implemented by default.
 
 #### `i3.add_search_filter(name, function(item, values))`
 
@@ -237,15 +237,6 @@ Returns a map of search filters, indexed by name.
 
 ### Miscellaneous
 
-#### `i3.group_stereotypes`
-
-This is the table indexing the item groups by stereotypes.
-You can add a stereotype like so:
-
-```Lua
-i3.group_stereotypes.radioactive = "mod:item"
-```
-
 #### `i3.export_url`
 
 If set, the mod will export all the cached recipes and usages in a JSON format
diff --git a/README.md b/README.md
index d1dd3be..9fdce53 100644
--- a/README.md
+++ b/README.md
@@ -18,6 +18,7 @@ This mod requires **Minetest 5.4+**
    - Inventory Sorting (alphabetical + item stack compression)
    - Item Bookmarks
    - Waypoints
+   - Item List Compression (**`moreblocks`** supported)
 
 **¹** *This mode is a Terraria-like system that shows recipes you can craft from items you ever had in your inventory.
 To enable it: `i3_progressive_mode = true` in `minetest.conf`.*
@@ -48,4 +49,4 @@ Love this mod? Donations are appreciated: https://www.paypal.me/jpg84240
 
 Demo video (outdated): https://www.youtube.com/watch?v=25nCAaqeacU
 
-![Preview](https://user-images.githubusercontent.com/7883281/116791813-0edf7b00-aabd-11eb-90b3-11c604af34dc.png)
+![Preview](https://user-images.githubusercontent.com/7883281/123561657-10ba7780-d7aa-11eb-8bbe-dcec348bb28c.png)
diff --git a/etc/compress.lua b/etc/compress.lua
new file mode 100644
index 0000000..a33b91f
--- /dev/null
+++ b/etc/compress.lua
@@ -0,0 +1,319 @@
+local fmt, insert = string.format, table.insert
+
+local wood_types = {
+	"acacia_wood", "aspen_wood", "junglewood", "pine_wood",
+}
+
+local material_tools = {
+	"bronze", "diamond", "mese", "stone", "wood",
+}
+
+local material_stairs = {
+	"acacia_wood", "aspen_wood", "brick", "bronzeblock", "cobble", "copperblock",
+	"desert_cobble", "desert_sandstone", "desert_sandstone_block", "desert_sandstone_brick",
+	"desert_stone", "desert_stone_block", "desert_stonebrick",
+	"glass", "goldblock", "ice", "junglewood", "mossycobble", "obsidian",
+	"obsidian_block", "obsidian_glass", "obsidianbrick", "pine_wood",
+	"sandstone", "sandstone_block", "sandstonebrick",
+	"silver_sandstone", "silver_sandstone_block", "silver_sandstone_brick",
+	"snowblock", "steelblock", "stone", "stone_block", "stonebrick",
+	"straw", "tinblock",
+}
+
+local colors = {
+	"black", "blue", "brown", "cyan", "dark_green", "dark_grey", "green",
+	"grey", "magenta", "orange", "pink", "red", "violet", "yellow",
+}
+
+local to_compress = {
+	["default:wood"] = {
+		replace = "wood",
+		by = wood_types,
+	},
+
+	["default:fence_wood"] = {
+		replace = "wood",
+		by = wood_types,
+	},
+
+	["default:fence_rail_wood"] = {
+		replace = "wood",
+		by = wood_types,
+	},
+
+	["default:mese_post_light"] = {
+		replace = "mese_post_light",
+		by = {
+			"mese_post_light_acacia",
+			"mese_post_light_aspen_wood",
+			"mese_post_light_junglewood",
+			"mese_post_light_pine_wood",
+		}
+	},
+
+	["doors:gate_wood_closed"] = {
+		replace = "wood",
+		by = wood_types,
+	},
+
+	["wool:white"] = {
+		replace = "white",
+		by = colors
+	},
+
+	["dye:white"] = {
+		replace = "white",
+		by = colors
+	},
+
+	["default:axe_steel"] = {
+		replace = "steel",
+		by = material_tools
+	},
+
+	["default:pick_steel"] = {
+		replace = "steel",
+		by = material_tools
+	},
+
+	["default:shovel_steel"] = {
+		replace = "steel",
+		by = material_tools
+	},
+
+	["default:sword_steel"] = {
+		replace = "steel",
+		by = material_tools
+	},
+
+	["farming:hoe_steel"] = {
+		replace = "steel",
+		by = {"wood", "stone"}
+	},
+
+	["stairs:slab_wood"] = {
+		replace = "wood",
+		by = material_stairs
+	},
+
+	["stairs:stair_wood"] = {
+		replace = "wood",
+		by = material_stairs
+	},
+
+	["stairs:stair_inner_wood"] = {
+		replace = "wood",
+		by = material_stairs
+	},
+
+	["stairs:stair_outer_wood"] = {
+		replace = "wood",
+		by = material_stairs
+	},
+
+	["walls:cobble"] = {
+		replace = "cobble",
+		by = {"desertcobble", "mossycobble"}
+	},
+}
+
+local circular_saw_names = {
+	{"micro", "_1"},
+	{"panel", "_1"},
+	{"micro", "_2"},
+	{"panel", "_2"},
+	{"micro", "_4"},
+	{"panel", "_4"},
+	{"micro", ""},
+	{"panel", ""},
+
+	{"micro", "_12"},
+	{"panel", "_12"},
+	{"micro", "_14"},
+	{"panel", "_14"},
+	{"micro", "_15"},
+	{"panel", "_15"},
+	{"stair", "_outer"},
+	{"stair", ""},
+
+	{"stair", "_inner"},
+	{"slab", "_1"},
+	{"slab", "_2"},
+	{"slab", "_quarter"},
+	{"slab", ""},
+	{"slab", "_three_quarter"},
+	{"slab", "_14"},
+	{"slab", "_15"},
+
+	{"slab", "_two_sides"},
+	{"slab", "_three_sides"},
+	{"slab", "_three_sides_u"},
+	{"stair", "_half"},
+	{"stair", "_alt_1"},
+	{"stair", "_alt_2"},
+	{"stair", "_alt_4"},
+	{"stair", "_alt"},
+	{"stair", "_right_half"},
+
+	{"slope", ""},
+	{"slope", "_half"},
+	{"slope", "_half_raised"},
+	{"slope", "_inner"},
+	{"slope", "_inner_half"},
+	{"slope", "_inner_half_raised"},
+	{"slope", "_inner_cut"},
+	{"slope", "_inner_cut_half"},
+
+	{"slope", "_inner_cut_half_raised"},
+	{"slope", "_outer"},
+	{"slope", "_outer_half"},
+	{"slope", "_outer_half_raised"},
+	{"slope", "_outer_cut"},
+	{"slope", "_outer_cut_half"},
+	{"slope", "_outer_cut_half_raised"},
+	{"slope", "_cut"},
+}
+
+local moreblocks_nodes = {
+	"coal_stone",
+	"wood_tile",
+	"iron_checker",
+	"circle_stone_bricks",
+	"cobble_compressed",
+	"plankstone",
+	"clean_glass",
+	"split_stone_tile",
+	"all_faces_tree",
+	"dirt_compressed",
+	"coal_checker",
+	"clean_glow_glass",
+	"tar",
+	"clean_super_glow_glass",
+	"stone_tile",
+	"cactus_brick",
+	"super_glow_glass",
+	"desert_cobble_compressed",
+	"copperpatina",
+	"coal_stone_bricks",
+	"glow_glass",
+	"cactus_checker",
+	"all_faces_pine_tree",
+	"all_faces_aspen_tree",
+	"all_faces_acacia_tree",
+	"all_faces_jungle_tree",
+	"iron_stone",
+	"grey_bricks",
+	"wood_tile_left",
+	"wood_tile_down",
+	"wood_tile_center",
+	"wood_tile_right",
+	"wood_tile_full",
+	"checker_stone_tile",
+	"iron_glass",
+	"iron_stone_bricks",
+	"wood_tile_flipped",
+	"wood_tile_offset",
+	"coal_glass",
+
+	"straw",
+
+	"stone",
+	"stone_block",
+	"cobble",
+	"mossycobble",
+	"brick",
+	"sandstone",
+	"steelblock",
+	"goldblock",
+	"copperblock",
+	"bronzeblock",
+	"diamondblock",
+	"tinblock",
+	"desert_stone",
+	"desert_stone_block",
+	"desert_cobble",
+	"meselamp",
+	"glass",
+	"tree",
+	"wood",
+	"jungletree",
+	"junglewood",
+	"pine_tree",
+	"pine_wood",
+	"acacia_tree",
+	"acacia_wood",
+	"aspen_tree",
+	"aspen_wood",
+	"obsidian",
+	"obsidian_block",
+	"obsidianbrick",
+	"obsidian_glass",
+	"stonebrick",
+	"desert_stonebrick",
+	"sandstonebrick",
+	"silver_sandstone",
+	"silver_sandstone_brick",
+	"silver_sandstone_block",
+	"desert_sandstone",
+	"desert_sandstone_brick",
+	"desert_sandstone_block",
+	"sandstone_block",
+	"coral_skeleton",
+	"ice",
+}
+
+local colors_moreblocks = table.copy(colors)
+insert(colors_moreblocks, "white")
+
+local moreblocks_mods = {
+	wool = colors_moreblocks,
+	moreblocks = moreblocks_nodes,
+}
+
+local t = {}
+
+for mod, v in pairs(moreblocks_mods) do
+for _, nodename in ipairs(v) do
+	t[nodename] = {}
+
+	for _, shape in ipairs(circular_saw_names) do
+		local to_add = true
+
+		if shape[1] == "slope" and shape[2] == "" then
+			to_add = nil
+		end
+
+		if to_add then
+			insert(t[nodename], fmt("%s_%s%s", shape[1], nodename, shape[2]))
+		end
+	end
+
+	local slope_name = fmt("slope_%s", nodename)
+
+	to_compress[fmt("%s:%s", mod, slope_name)] = {
+		replace = slope_name,
+		by = t[nodename]
+	}
+end
+end
+
+local compressed = {}
+
+for k, v in pairs(to_compress) do
+	compressed[k] = compressed[k] or {}
+
+	for _, str in ipairs(v.by) do
+		local it = k:gsub(v.replace, str)
+		insert(compressed[k], it)
+	end
+end
+
+local _compressed = {}
+
+for _, v in pairs(compressed) do
+for _, v2 in ipairs(v) do
+	_compressed[v2] = true
+end
+end
+
+return compressed, _compressed
diff --git a/etc/groups.lua b/etc/groups.lua
new file mode 100644
index 0000000..ea126e9
--- /dev/null
+++ b/etc/groups.lua
@@ -0,0 +1,62 @@
+local S = core.get_translator "i3"
+
+local group_stereotypes = {
+	dye = "dye:white",
+	wool = "wool:white",
+	wood = "default:wood",
+	tree = "default:tree",
+	sand = "default:sand",
+	glass = "default:glass",
+	stick = "default:stick",
+	stone = "default:stone",
+	leaves = "default:leaves",
+	coal = "default:coal_lump",
+	vessel = "vessels:glass_bottle",
+	flower = "flowers:dandelion_yellow",
+	water_bucket = "bucket:bucket_water",
+	mesecon_conductor_craftable = "mesecons:wire_00000000_off",
+}
+
+local group_names = {
+	dye = S"Any dye",
+	coal = S"Any coal",
+	sand = S"Any sand",
+	tree = S"Any tree",
+	wool = S"Any wool",
+	glass = S"Any glass",
+	stick = S"Any stick",
+	stone = S"Any stone",
+	carpet = S"Any carpet",
+	flower = S"Any flower",
+	leaves = S"Any leaves",
+	vessel = S"Any vessel",
+	wood = S"Any wood planks",
+	mushroom = S"Any mushroom",
+
+	["color_red,flower"] = S"Any red flower",
+	["color_blue,flower"] = S"Any blue flower",
+	["color_black,flower"] = S"Any black flower",
+	["color_white,flower"] = S"Any white flower",
+	["color_green,flower"] = S"Any green flower",
+	["color_orange,flower"] = S"Any orange flower",
+	["color_yellow,flower"] = S"Any yellow flower",
+	["color_violet,flower"] = S"Any violet flower",
+
+	["color_red,dye"] = S"Any red dye",
+	["color_blue,dye"] = S"Any blue dye",
+	["color_grey,dye"] = S"Any grey dye",
+	["color_pink,dye"] = S"Any pink dye",
+	["color_cyan,dye"] = S"Any cyan dye",
+	["color_black,dye"] = S"Any black dye",
+	["color_white,dye"] = S"Any white dye",
+	["color_brown,dye"] = S"Any brown dye",
+	["color_green,dye"] = S"Any green dye",
+	["color_orange,dye"] = S"Any orange dye",
+	["color_yellow,dye"] = S"Any yellow dye",
+	["color_violet,dye"] = S"Any violet dye",
+	["color_magenta,dye"] = S"Any magenta dye",
+	["color_dark_grey,dye"] = S"Any dark grey dye",
+	["color_dark_green,dye"] = S"Any dark green dye",
+}
+
+return group_stereotypes, group_names
diff --git a/etc/model_aliases.lua b/etc/model_aliases.lua
new file mode 100644
index 0000000..30083e6
--- /dev/null
+++ b/etc/model_aliases.lua
@@ -0,0 +1,13 @@
+local model_alias = {
+	["boats:boat"] = {name = "boats:boat", drawtype = "entity"},
+	["carts:cart"] = {name = "carts:cart", drawtype = "entity", frames = "0,0"},
+	["default:chest"] = {name = "default:chest_open"},
+	["default:chest_locked"] = {name = "default:chest_locked_open"},
+	["doors:door_wood"] = {name = "doors:door_wood_a"},
+	["doors:door_glass"] = {name = "doors:door_glass_a"},
+	["doors:door_obsidian_glass"] = {name = "doors:door_obsidian_glass_a"},
+	["doors:door_steel"] = {name = "doors:door_steel_a"},
+	["xpanes:door_steel_bar"] = {name = "xpanes:door_steel_bar_a"},
+}
+
+return model_alias
diff --git a/etc/styles.lua b/etc/styles.lua
new file mode 100644
index 0000000..da91599
--- /dev/null
+++ b/etc/styles.lua
@@ -0,0 +1,116 @@
+local fmt = string.format
+
+local PNG = {
+	bg = "i3_bg.png",
+	bg_full = "i3_bg_full.png",
+	bar = "i3_bar.png",
+	hotbar = "i3_hotbar.png",
+	search = "i3_search.png",
+	heart = "i3_heart.png",
+	heart_half = "i3_heart_half.png",
+	heart_grey = "i3_heart_grey.png",
+	prev = "i3_next.png^\\[transformFX",
+	next = "i3_next.png",
+	arrow = "i3_arrow.png",
+	trash = "i3_trash.png",
+	sort_az = "i3_sort_az.png",
+	sort_za = "i3_sort_za.png",
+	compress = "i3_compress.png",
+	fire = "i3_fire.png",
+	fire_anim = "i3_fire_anim.png",
+	book = "i3_book.png",
+	sign = "i3_sign.png",
+	cancel = "i3_cancel.png",
+	export = "i3_export.png",
+	slot = "i3_slot.png",
+	tab = "i3_tab.png",
+	tab_small = "i3_tab_small.png",
+	tab_top = "i3_tab.png^\\[transformFY",
+	furnace_anim = "i3_furnace_anim.png",
+	bag = "i3_bag.png",
+	armor = "i3_armor.png",
+	awards = "i3_award.png",
+	skins = "i3_skin.png",
+	waypoints = "i3_waypoint.png",
+	teleport = "i3_teleport.png",
+	add = "i3_add.png",
+	refresh = "i3_refresh.png",
+	visible = "i3_visible.png^\\[brighten",
+	nonvisible = "i3_non_visible.png",
+	exit = "i3_exit.png",
+
+	cancel_hover = "i3_cancel.png^\\[brighten",
+	search_hover = "i3_search.png^\\[brighten",
+	export_hover = "i3_export.png^\\[brighten",
+	trash_hover = "i3_trash.png^\\[brighten^\\[colorize:#f00:100",
+	compress_hover = "i3_compress.png^\\[brighten",
+	sort_az_hover = "i3_sort_az.png^\\[brighten",
+	sort_za_hover = "i3_sort_za.png^\\[brighten",
+	prev_hover = "i3_next_hover.png^\\[transformFX",
+	next_hover = "i3_next_hover.png",
+	tab_hover = "i3_tab_hover.png",
+	tab_small_hover = "i3_tab_small_hover.png",
+	tab_hover_top = "i3_tab_hover.png^\\[transformFY",
+	bag_hover = "i3_bag_hover.png",
+	armor_hover = "i3_armor_hover.png",
+	awards_hover = "i3_award_hover.png",
+	skins_hover = "i3_skin_hover.png",
+	waypoints_hover = "i3_waypoint_hover.png",
+	teleport_hover = "i3_teleport.png^\\[brighten",
+	add_hover = "i3_add.png^\\[brighten",
+	refresh_hover = "i3_refresh.png^\\[brighten",
+	exit_hover = "i3_exit.png^\\[brighten",
+}
+
+local styles = fmt([[
+	style_type[field;border=false;bgcolor=transparent]
+	style_type[label,field;font_size=16]
+	style_type[button;border=false;content_offset=0]
+	style_type[image_button,item_image_button;border=false;sound=i3_click]
+	style_type[item_image_button;bgimg_hovered=%s]
+
+	style[pagenum,no_item,no_rcp;font=bold;font_size=18]
+	style[exit;fgimg=%s;fgimg_hovered=%s;content_offset=0]
+	style[cancel;fgimg=%s;fgimg_hovered=%s;content_offset=0]
+	style[search;fgimg=%s;fgimg_hovered=%s;content_offset=0]
+	style[prev_page;fgimg=%s;fgimg_hovered=%s]
+	style[next_page;fgimg=%s;fgimg_hovered=%s]
+	style[prev_recipe;fgimg=%s;fgimg_hovered=%s]
+	style[next_recipe;fgimg=%s;fgimg_hovered=%s]
+	style[prev_usage;fgimg=%s;fgimg_hovered=%s]
+	style[next_usage;fgimg=%s;fgimg_hovered=%s]
+	style[waypoint_add;fgimg=%s;fgimg_hovered=%s;content_offset=0]
+	style[btn_bag,btn_armor,btn_skins;font=bold;font_size=18;content_offset=0;sound=i3_click]
+	style[craft_rcp,craft_usg;noclip=true;font_size=16;sound=i3_craft;
+	      bgimg=i3_btn9.png;bgimg_hovered=i3_btn9_hovered.png;
+	      bgimg_pressed=i3_btn9_pressed.png;bgimg_middle=4,6]
+]],
+PNG.slot,
+PNG.exit,     PNG.exit_hover,
+PNG.cancel,   PNG.cancel_hover,
+PNG.search,   PNG.search_hover,
+PNG.prev,     PNG.prev_hover,
+PNG.next,     PNG.next_hover,
+PNG.prev,     PNG.prev_hover,
+PNG.next,     PNG.next_hover,
+PNG.prev,     PNG.prev_hover,
+PNG.next,     PNG.next_hover,
+PNG.add,      PNG.add_hover)
+
+local fs_elements = {
+	label = "label[%f,%f;%s]",
+	box = "box[%f,%f;%f,%f;%s]",
+	image = "image[%f,%f;%f,%f;%s]",
+	tooltip = "tooltip[%f,%f;%f,%f;%s]",
+	button = "button[%f,%f;%f,%f;%s;%s]",
+	item_image = "item_image[%f,%f;%f,%f;%s]",
+	hypertext = "hypertext[%f,%f;%f,%f;%s;%s]",
+	bg9 = "background9[%f,%f;%f,%f;%s;false;%u]",
+	scrollbar = "scrollbar[%f,%f;%f,%f;%s;%s;%u]",
+	model = "model[%f,%f;%f,%f;%s;%s;%s;%s;%s;%s;%s]",
+	image_button = "image_button[%f,%f;%f,%f;%s;%s;%s]",
+	animated_image = "animated_image[%f,%f;%f,%f;;%s;%u;%u]",
+	item_image_button = "item_image_button[%f,%f;%f,%f;%s;%s;%s]",
+}
+
+return PNG, styles, fs_elements
diff --git a/init.lua b/init.lua
index 0e6af50..088248e 100644
--- a/init.lua
+++ b/init.lua
@@ -1,12 +1,12 @@
 i3 = {}
 
+local modpath = core.get_modpath "i3"
 local storage = core.get_mod_storage()
 local slz, dslz = core.serialize, core.deserialize
 local pdata = dslz(storage:get_string "pdata") or {}
 
 -- Caches
 local init_items    = {}
-local searches      = {}
 local recipes_cache = {}
 local usages_cache  = {}
 local fuel_cache    = {}
@@ -15,7 +15,13 @@ local toolrepair
 
 local tabs = {}
 
+local model_aliases = loadfile(modpath .. "/etc/model_aliases.lua")()
+local PNG, styles, fs_elements = loadfile(modpath .. "/etc/styles.lua")()
+local compress_groups, compressed = loadfile(modpath .. "/etc/compress.lua")()
+local group_stereotypes, group_names = loadfile(modpath .. "/etc/groups.lua")()
+
 local progressive_mode = core.settings:get_bool "i3_progressive_mode" and not(core.is_creative_enabled())
+local item_compression = core.settings:get_bool "i3_item_compression"
 local damage_enabled = core.settings:get_bool "enable_damage"
 
 local __3darmor, __skinsdb, __awards
@@ -25,6 +31,9 @@ local __unified_inventory, old_unified_inventory_fn
 local http = core.request_http_api()
 local singleplayer = core.is_singleplayer()
 
+local after = core.after
+local clr = core.colorize
+
 local reg_items = core.registered_items
 local reg_nodes = core.registered_nodes
 local reg_craftitems = core.registered_craftitems
@@ -32,29 +41,9 @@ local reg_tools = core.registered_tools
 local reg_entities = core.registered_entities
 local reg_aliases = core.registered_aliases
 
-local log = core.log
-local after = core.after
-local clr = core.colorize
-local parse_json = core.parse_json
-local write_json = core.write_json
-
-local get_inv = core.get_inventory
-local chat_send = core.chat_send_player
-local show_formspec = core.show_formspec
-local pos_to_string = core.pos_to_string
 local check_privs = core.check_player_privs
-local globalstep = core.register_globalstep
-local on_shutdown = core.register_on_shutdown
-local get_players = core.get_connected_players
-local get_craft_result = core.get_craft_result
-local translate = minetest.get_translated_string
-local on_joinplayer = core.register_on_joinplayer
-local get_all_recipes = core.get_all_craft_recipes
-local on_leaveplayer = core.register_on_leaveplayer
-local on_mods_loaded = core.register_on_mods_loaded
-local get_player_info = core.get_player_information
+local translate = core.get_translated_string
 local create_inventory = core.create_detached_inventory
-local on_receive_fields = core.register_on_player_receive_fields
 
 local ESC = core.formspec_escape
 local S = core.get_translator "i3"
@@ -109,117 +98,6 @@ local SUBCAT = {
 	"waypoints",
 }
 
-local PNG = {
-	bg = "i3_bg.png",
-	bg_full = "i3_bg_full.png",
-	bar = "i3_bar.png",
-	hotbar = "i3_hotbar.png",
-	search = "i3_search.png",
-	heart = "i3_heart.png",
-	heart_half = "i3_heart_half.png",
-	heart_grey = "i3_heart_grey.png",
-	prev = "i3_next.png^\\[transformFX",
-	next = "i3_next.png",
-	arrow = "i3_arrow.png",
-	trash = "i3_trash.png",
-	sort_az = "i3_sort_az.png",
-	sort_za = "i3_sort_za.png",
-	compress = "i3_compress.png",
-	fire = "i3_fire.png",
-	fire_anim = "i3_fire_anim.png",
-	book = "i3_book.png",
-	sign = "i3_sign.png",
-	cancel = "i3_cancel.png",
-	export = "i3_export.png",
-	slot = "i3_slot.png",
-	tab = "i3_tab.png",
-	tab_top = "i3_tab.png^\\[transformFY",
-	furnace_anim = "i3_furnace_anim.png",
-	bag = "i3_bag.png",
-	armor = "i3_armor.png",
-	awards = "i3_award.png",
-	skins = "i3_skin.png",
-	waypoints = "i3_waypoint.png",
-	teleport = "i3_teleport.png",
-	add = "i3_add.png",
-	refresh = "i3_refresh.png",
-	visible = "i3_visible.png^\\[brighten",
-	nonvisible = "i3_non_visible.png",
-	exit = "i3_exit.png",
-
-	cancel_hover = "i3_cancel.png^\\[brighten",
-	search_hover = "i3_search.png^\\[brighten",
-	export_hover = "i3_export.png^\\[brighten",
-	trash_hover = "i3_trash.png^\\[brighten^\\[colorize:#f00:100",
-	compress_hover = "i3_compress.png^\\[brighten",
-	sort_az_hover = "i3_sort_az.png^\\[brighten",
-	sort_za_hover = "i3_sort_za.png^\\[brighten",
-	prev_hover = "i3_next_hover.png^\\[transformFX",
-	next_hover = "i3_next_hover.png",
-	tab_hover = "i3_tab_hover.png",
-	tab_hover_top = "i3_tab_hover.png^\\[transformFY",
-	bag_hover = "i3_bag_hover.png",
-	armor_hover = "i3_armor_hover.png",
-	awards_hover = "i3_award_hover.png",
-	skins_hover = "i3_skin_hover.png",
-	waypoints_hover = "i3_waypoint_hover.png",
-	teleport_hover = "i3_teleport.png^\\[brighten",
-	add_hover = "i3_add.png^\\[brighten",
-	refresh_hover = "i3_refresh.png^\\[brighten",
-	exit_hover = "i3_exit.png^\\[brighten",
-}
-
-local fs_elements = {
-	label = "label[%f,%f;%s]",
-	box = "box[%f,%f;%f,%f;%s]",
-	image = "image[%f,%f;%f,%f;%s]",
-	tooltip = "tooltip[%f,%f;%f,%f;%s]",
-	button = "button[%f,%f;%f,%f;%s;%s]",
-	item_image = "item_image[%f,%f;%f,%f;%s]",
-	hypertext = "hypertext[%f,%f;%f,%f;%s;%s]",
-	bg9 = "background9[%f,%f;%f,%f;%s;false;%u]",
-	scrollbar = "scrollbar[%f,%f;%f,%f;%s;%s;%u]",
-	model = "model[%f,%f;%f,%f;%s;%s;%s;%s;%s;%s;%s]",
-	image_button = "image_button[%f,%f;%f,%f;%s;%s;%s]",
-	animated_image = "animated_image[%f,%f;%f,%f;;%s;%u;%u]",
-	item_image_button = "item_image_button[%f,%f;%f,%f;%s;%s;%s]",
-}
-
-local styles = sprintf([[
-	style_type[field;border=false;bgcolor=transparent]
-	style_type[label,field;font_size=16]
-	style_type[button;border=false;content_offset=0]
-	style_type[image_button,item_image_button;border=false;sound=i3_click]
-	style_type[item_image_button;bgimg_hovered=%s]
-
-	style[pagenum,no_item,no_rcp;font=bold;font_size=18]
-	style[exit;fgimg=%s;fgimg_hovered=%s;content_offset=0]
-	style[cancel;fgimg=%s;fgimg_hovered=%s;content_offset=0]
-	style[search;fgimg=%s;fgimg_hovered=%s;content_offset=0]
-	style[prev_page;fgimg=%s;fgimg_hovered=%s]
-	style[next_page;fgimg=%s;fgimg_hovered=%s]
-	style[prev_recipe;fgimg=%s;fgimg_hovered=%s]
-	style[next_recipe;fgimg=%s;fgimg_hovered=%s]
-	style[prev_usage;fgimg=%s;fgimg_hovered=%s]
-	style[next_usage;fgimg=%s;fgimg_hovered=%s]
-	style[waypoint_add;fgimg=%s;fgimg_hovered=%s;content_offset=0]
-	style[btn_bag,btn_armor,btn_skins;font=bold;font_size=18;content_offset=0;sound=i3_click]
-	style[craft_rcp,craft_usg;noclip=true;font_size=16;sound=i3_craft;
-	      bgimg=i3_btn9.png;bgimg_hovered=i3_btn9_hovered.png;
-	      bgimg_pressed=i3_btn9_pressed.png;bgimg_middle=4,6]
-]],
-PNG.slot,
-PNG.exit,     PNG.exit_hover,
-PNG.cancel,   PNG.cancel_hover,
-PNG.search,   PNG.search_hover,
-PNG.prev,     PNG.prev_hover,
-PNG.next,     PNG.next_hover,
-PNG.prev,     PNG.prev_hover,
-PNG.next,     PNG.next_hover,
-PNG.prev,     PNG.prev_hover,
-PNG.next,     PNG.next_hover,
-PNG.add,      PNG.add_hover)
-
 local function get_lang_code(info)
 	return info and info.lang_code
 end
@@ -233,92 +111,25 @@ local function outdated(name)
 		PNG.book,
 		"Your Minetest client is outdated.\nGet the latest version on minetest.net to use i3")
 
-	show_formspec(name, "i3", fs)
+	core.show_formspec(name, "i3", fs)
 end
 
 local old_is_creative_enabled = core.is_creative_enabled
 
 function core.is_creative_enabled(name)
+	if name == "" then
+		return old_is_creative_enabled(name)
+	end
+
 	return check_privs(name, {creative = true}) or old_is_creative_enabled(name)
 end
 
-i3.group_stereotypes = {
-	dye = "dye:white",
-	wool = "wool:white",
-	wood = "default:wood",
-	tree = "default:tree",
-	sand = "default:sand",
-	glass = "default:glass",
-	stick = "default:stick",
-	stone = "default:stone",
-	leaves = "default:leaves",
-	coal = "default:coal_lump",
-	vessel = "vessels:glass_bottle",
-	flower = "flowers:dandelion_yellow",
-	water_bucket = "bucket:bucket_water",
-	mesecon_conductor_craftable = "mesecons:wire_00000000_off",
-}
-
-local group_names = {
-	dye = S"Any dye",
-	coal = S"Any coal",
-	sand = S"Any sand",
-	tree = S"Any tree",
-	wool = S"Any wool",
-	glass = S"Any glass",
-	stick = S"Any stick",
-	stone = S"Any stone",
-	carpet = S"Any carpet",
-	flower = S"Any flower",
-	leaves = S"Any leaves",
-	vessel = S"Any vessel",
-	wood = S"Any wood planks",
-	mushroom = S"Any mushroom",
-
-	["color_red,flower"] = S"Any red flower",
-	["color_blue,flower"] = S"Any blue flower",
-	["color_black,flower"] = S"Any black flower",
-	["color_white,flower"] = S"Any white flower",
-	["color_green,flower"] = S"Any green flower",
-	["color_orange,flower"] = S"Any orange flower",
-	["color_yellow,flower"] = S"Any yellow flower",
-	["color_violet,flower"] = S"Any violet flower",
-
-	["color_red,dye"] = S"Any red dye",
-	["color_blue,dye"] = S"Any blue dye",
-	["color_grey,dye"] = S"Any grey dye",
-	["color_pink,dye"] = S"Any pink dye",
-	["color_cyan,dye"] = S"Any cyan dye",
-	["color_black,dye"] = S"Any black dye",
-	["color_white,dye"] = S"Any white dye",
-	["color_brown,dye"] = S"Any brown dye",
-	["color_green,dye"] = S"Any green dye",
-	["color_orange,dye"] = S"Any orange dye",
-	["color_yellow,dye"] = S"Any yellow dye",
-	["color_violet,dye"] = S"Any violet dye",
-	["color_magenta,dye"] = S"Any magenta dye",
-	["color_dark_grey,dye"] = S"Any dark grey dye",
-	["color_dark_green,dye"] = S"Any dark green dye",
-}
-
-i3.model_alias = {
-	["boats:boat"] = {name = "boats:boat", drawtype = "entity"},
-	["carts:cart"] = {name = "carts:cart", drawtype = "entity", frames = "0,0"},
-	["default:chest"] = {name = "default:chest_open"},
-	["default:chest_locked"] = {name = "default:chest_locked_open"},
-	["doors:door_wood"] = {name = "doors:door_wood_a"},
-	["doors:door_glass"] = {name = "doors:door_glass_a"},
-	["doors:door_obsidian_glass"] = {name = "doors:door_obsidian_glass_a"},
-	["doors:door_steel"] = {name = "doors:door_steel_a"},
-	["xpanes:door_steel_bar"] = {name = "xpanes:door_steel_bar_a"},
-}
-
 local function err(str)
-	return log("error", str)
+	return core.log("error", str)
 end
 
 local function msg(name, str)
-	return chat_send(name, sprintf("[i3] %s", str))
+	return core.chat_send_player(name, sprintf("[i3] %s", str))
 end
 
 local function is_num(x)
@@ -354,7 +165,7 @@ local function fmt(elem, ...)
 end
 
 local function clean_name(item)
-	if sub(item, 1, 1) == ":" or sub(item, 1, 1) == " " then
+	if sub(item, 1, 1) == ":" or sub(item, 1, 1) == " " or sub(item, 1, 1) == "_" then
 		item = sub(item, 2)
 	end
 
@@ -500,7 +311,7 @@ function i3.register_craft(def)
 
 		http.fetch({url = def.url}, function(result)
 			if result.succeeded then
-				local t = parse_json(result.data)
+				local t = core.parse_json(result.data)
 				if is_table(t) then
 					return i3.register_craft(t)
 				end
@@ -615,7 +426,7 @@ function i3.set_recipe_filter(name, f)
 	recipe_filters = {[name] = f}
 end
 
-function i3.delete_recipe_filter(name)
+function i3.remove_recipe_filter(name)
 	recipe_filters[name] = nil
 end
 
@@ -651,6 +462,14 @@ function i3.get_search_filters()
 	return search_filters
 end
 
+local function compression_active(data)
+	return item_compression and not next(recipe_filters) and data.filter == ""
+end
+
+local function compressible(item, data)
+	return compression_active(data) and compress_groups[item]
+end
+
 local function weird_desc(str)
 	return not true_str(str) or find(str, "\n") or not find(str, "%u")
 end
@@ -734,7 +553,7 @@ local function get_filtered_items(player, data)
 end
 
 local function get_burntime(item)
-	return get_craft_result{method = "fuel", items = {item}}.time
+	return core.get_craft_result{method = "fuel", items = {item}}.time
 end
 
 local function cache_fuel(item)
@@ -754,19 +573,22 @@ local function show_item(def)
 		def.description and def.description ~= ""
 end
 
+local function reset_compression(data)
+	data.alt_items = nil
+	data.expand = ""
+end
+
 local function search(data)
+	reset_compression(data)
+
 	local filter = data.filter
-
-	if searches[filter] then
-		data.items = searches[filter]
-		return
-	end
-
 	local opt = "^(.-)%+([%w_]+)=([%w_,]+)"
 	local search_filter = next(search_filters) and match(filter, opt)
 	local filters = {}
 
 	if search_filter then
+		search_filter = search_filter:trim()
+
 		for filter_name, values in gmatch(filter, sub(opt, 6)) do
 			if search_filters[filter_name] then
 				values = split(values, ",")
@@ -800,7 +622,18 @@ local function search(data)
 				end
 			end
 		else
-			to_add = find(search_in, filter, 1, true)
+			local ok = true
+
+			for keyword in gmatch(filter, "%S+") do
+				if not find(search_in, keyword, 1, true) then
+					ok = nil
+					break
+				end
+			end
+
+			if ok then
+				to_add = true
+			end
 		end
 
 		if to_add then
@@ -809,16 +642,36 @@ local function search(data)
 		end
 	end
 
-	if not next(recipe_filters) then
-		-- Cache the results only if searched 2 times
-		if searches[filter] == nil then
-			searches[filter] = false
-		else
-			searches[filter] = filtered_list
+	data.items = filtered_list
+end
+
+local function sort_by_category(data)
+	reset_compression(data)
+	local items = data.items_raw
+
+	if data.filter ~= "" then
+		search(data)
+		items = data.items
+	end
+
+	local new = {}
+
+	for i = 1, #items do
+		local item = items[i]
+		local to_add = true
+
+		if data.current_itab == 2 then
+			to_add = reg_nodes[item]
+		elseif data.current_itab == 3 then
+			to_add = reg_craftitems[item] or reg_tools[item]
+		end
+
+		if to_add then
+			new[#new + 1] = item
 		end
 	end
 
-	data.items = filtered_list
+	data.items = new
 end
 
 local function get_item_usages(item, recipe, added)
@@ -923,7 +776,7 @@ local function cache_drops(name, drop)
 end
 
 local function cache_recipes(item)
-	local recipes = get_all_recipes(item)
+	local recipes = core.get_all_craft_recipes(item)
 
 	if replacements[item] then
 		local _recipes = {}
@@ -978,15 +831,16 @@ end
 local function groups_to_items(groups, get_all)
 	if not get_all and #groups == 1 then
 		local group = groups[1]
-		local stereotype = i3.group_stereotypes[group]
+		local stereotype = group_stereotypes[group]
 		local def = reg_items[stereotype]
 
-		if def and show_item(def) then
+		if show_item(def) then
 			return stereotype
 		end
 	end
 
 	local names = {}
+
 	for name, def in pairs(reg_items) do
 		if show_item(def) and item_has_groups(def.groups, groups) then
 			if get_all then
@@ -1241,36 +1095,84 @@ local function select_item(player, name, data, _f)
 		end
 	end
 
-	if not item then
-		return
-	elseif sub(item, 1, 1) == "_" then
-		item = sub(item, 2)
-	elseif sub(item, 1, 6) == "group|" then
-		item = match(item, "([%w:_]+)$")
+	if not item then return end
+
+	if compressible(item, data) then
+		local idx
+
+		for i = 1, #data.items do
+			local it = data.items[i]
+			if it == item then
+				idx = i
+				break
+			end
+		end
+
+		if data.expand ~= "" then
+			data.alt_items = nil
+
+			if item == data.expand then
+				data.expand = nil
+				return
+			end
+		end
+
+		if idx and item ~= data.expand then
+			data.alt_items = copy(data.items)
+			data.expand = item
+
+			if compress_groups[item] then
+				local items = copy(compress_groups[item])
+				insert(items, fmt("_%s", item))
+
+				sort(items, function(a, b)
+					if a:sub(1, 1) == "_" then
+						a = a:sub(2)
+					end
+
+					return a < b
+				end)
+
+				local i = 1
+
+				for _, v in ipairs(items) do
+					if show_item(reg_items[clean_name(v)]) then
+						insert(data.alt_items, idx + i, v)
+						i = i + 1
+					end
+				end
+			end
+		end
+	else
+		if sub(item, 1, 1) == "_" then
+			item = sub(item, 2)
+		elseif sub(item, 1, 6) == "group|" then
+			item = match(item, "([%w:_]+)$")
+		end
+
+		item = reg_aliases[item] or item
+		if not reg_items[item] then return end
+
+		if core.is_creative_enabled(name) then
+			local stack = ItemStack(item)
+			local stackmax = stack:get_stack_max()
+			stack = fmt("%s %s", item, stackmax)
+			return get_stack(player, stack, clr("#ff0", fmt("%u x %s", stackmax, get_desc(item))))
+		end
+
+		if item == data.query_item then return end
+		local recipes, usages = get_recipes(player, item)
+
+		data.query_item = item
+		data.recipes    = recipes
+		data.usages     = usages
+		data.rnum       = 1
+		data.unum       = 1
+		data.scrbar_rcp = 1
+		data.scrbar_usg = 1
+		data.export_rcp = nil
+		data.export_usg = nil
 	end
-
-	item = reg_aliases[item] or item
-	if not reg_items[item] then return end
-
-	if core.is_creative_enabled(name) then
-		local stack = ItemStack(item)
-		local stackmax = stack:get_stack_max()
-		stack = fmt("%s %s", item, stackmax)
-		return get_stack(player, stack, clr("#ff0", fmt("%u x %s", stackmax, get_desc(item))))
-	end
-
-	if item == data.query_item then return end
-	local recipes, usages = get_recipes(player, item)
-
-	data.query_item = item
-	data.recipes    = recipes
-	data.usages     = usages
-	data.rnum       = 1
-	data.unum       = 1
-	data.scrbar_rcp = 1
-	data.scrbar_usg = 1
-	data.export_rcp = nil
-	data.export_usg = nil
 end
 
 local function repairable(tool)
@@ -1421,7 +1323,11 @@ local function get_output_fs(fs, data, rcp, is_recipe, shapeless, right, btn_siz
 			fs(fmt("list[detached:i3_output_%s;main;%f,%f;1,1;]", rcp_usg, X + 0.11, Y))
 			fs("button",  X + 0.11, Y, ITEM_BTN_SIZE, ITEM_BTN_SIZE, _name, "")
 
-			local inv = get_inv {type = "detached", name = fmt("i3_output_%s", rcp_usg)}
+			local inv = core.get_inventory {
+				type = "detached",
+				name = fmt("i3_output_%s", rcp_usg)
+			}
+
 			inv:set_stack("main", 1, item)
 			pos = {x = X + 0.11, y = Y}
 		else
@@ -1708,7 +1614,7 @@ local function get_header(fs, data)
 	fs("style_type[label;font=normal;font_size=16]")
 
 	local def = reg_items[data.query_item]
-	local model_alias = i3.model_alias[data.query_item]
+	local model_alias = model_aliases[data.query_item]
 
 	if def.drawtype == "mesh" or model_alias then
 		get_model_fs(fs, data, def, model_alias)
@@ -1788,9 +1694,22 @@ local function get_rcp_extra(player, fs, data, panel, is_recipe, is_usage)
 	fs("container_end[]")
 end
 
-local function get_items_fs(fs, data, extend)
-	local rows = 8
-	local lines = extend and 12 or 9
+local function get_items_fs(fs, data, full_height)
+	if compression_active(data) then
+		local new = {}
+
+		for i = 1, #data.items do
+			local item = data.items[i]
+			if not compressed[item] then
+				new[#new + 1] = item
+			end
+		end
+
+		data.items = new
+	end
+
+	local items = data.alt_items or data.items
+	local rows, lines = 8, 12
 	local ipp = rows * lines
 	local size = 0.85
 
@@ -1799,17 +1718,17 @@ local function get_items_fs(fs, data, extend)
 	   fmt("field[%f,0.2;2.95,0.6;filter;;%s]", data.inv_width + 0.35, ESC(data.filter)),
 	   "field_close_on_enter[filter;false]")
 
-	fs("image_button", data.inv_width + 3.35, 0.35, 0.3, 0.3, "", "cancel", "")
+	fs("image_button", data.inv_width + 3.35, 0.35, 0.3,  0.3,  "", "cancel", "")
 	fs("image_button", data.inv_width + 3.85, 0.32, 0.35, 0.35, "", "search", "")
-	fs("image_button", data.inv_width + 5.27, 0.3, 0.35, 0.35, "", "prev_page", "")
-	fs("image_button", data.inv_width + 7.45, 0.3, 0.35, 0.35, "", "next_page", "")
+	fs("image_button", data.inv_width + 5.27, 0.3,  0.35, 0.35, "", "prev_page", "")
+	fs("image_button", data.inv_width + 7.45, 0.3,  0.35, 0.35, "", "next_page", "")
 
-	data.pagemax = max(1, ceil(#data.items / ipp))
+	data.pagemax = max(1, ceil(#items / ipp))
 
 	fs("button", data.inv_width + 5.6, 0.14, 1.88, 0.7, "pagenum",
 		fmt("%s / %u", clr("#ff0", data.pagenum), data.pagemax))
 
-	if #data.items == 0 then
+	if #items == 0 then
 		local lbl = ES"No item to show"
 
 		if next(recipe_filters) and #init_items > 0 and data.filter == "" then
@@ -1817,21 +1736,49 @@ local function get_items_fs(fs, data, extend)
 		end
 
 		fs("button", data.inv_width + 0.1, 3, 8, 1, "no_item", lbl)
+	else
+		local first_item = (data.pagenum - 1) * ipp
+
+		for i = first_item, first_item + ipp - 1 do
+			local item = items[i + 1]
+			if not item then break end
+
+			local _compressed = item:sub(1, 1) == "_"
+			local name = _compressed and item:sub(2) or item
+
+			local X = i % rows
+			      X = X - (X * 0.045) + data.inv_width + 0.28
+
+			local Y = round((i % ipp - X) / rows + 1, 0)
+			      Y = Y - (Y * 0.085) + 0.95
+
+			fs[#fs + 1] = fmt("item_image_button", X, Y, size, size, name, item, "")
+
+			if compressible(item, data) then
+				local expand = data.expand == name
+
+				fs(fmt("tooltip[%s;%s]", item, expand and ES"Click to hide" or ES"Click to expand"))
+				fs("style_type[label;font=bold;font_size=20]")
+				fs("label", X + 0.65, Y + 0.7, expand and "-" or "+")
+				fs("style_type[label;font=normal;font_size=16]")
+			end
+		end
 	end
 
-	local first_item = (data.pagenum - 1) * ipp
+	local _tabs = {"All", "Nodes", "Items"}
+	local tab_len, tab_hgh = 1.8, 0.5
 
-	for i = first_item, first_item + ipp - 1 do
-		local item = data.items[i + 1]
-		if not item then break end
+	for i, title in ipairs(_tabs) do
+		local selected = i == data.current_itab
 
-		local X = i % rows
-		X = X - (X * 0.045) + data.inv_width + 0.28
+		fs(fmt([[style_type[image_button;fgimg=%s;fgimg_hovered=%s;noclip=true;
+			font_size=16;textcolor=%s;content_offset=0;sound=i3_tab] ]],
+		selected and PNG.tab_small_hover or PNG.tab_small,
+		PNG.tab_small_hover, selected and "#fff" or "#ddd"))
 
-		local Y = round((i % ipp - X) / rows + 1, 0)
-		Y = Y - (Y * (extend and 0.085 or 0.035)) + 0.95
-
-		fs[#fs + 1] = fmt("item_image_button", X, Y, size, size, item, item, "")
+		fs("style_type[image_button:hovered;textcolor=#fff]")
+		fs("image_button", (data.inv_width - 0.65) + (i * (tab_len + 0.1)),
+			full_height, tab_len, tab_hgh, "", fmt("itab_%u", i), title)
 	end
 end
 
@@ -1854,21 +1801,15 @@ end
 local function get_panels(player, data, fs, full_height)
 	local _title   = {name = "title", height = 1.4}
 	local _favs    = {name = "favs",  height = 2.23}
-	local _items   = {name = "items", height = 9.69}
+	local _items   = {name = "items", height = full_height}
 	local _recipes = {name = "recipes", rcp = data.recipes, height = 4.045}
 	local _usages  = {name = "usages",  rcp = data.usages,  height = 4.045}
-	local panels, extend
+	local panels
 
 	if data.query_item then
 		panels = {_title, _recipes, _usages, _favs}
 	else
-		panels = {_items, _favs}
-
-		if #data.favs == 0 then
-			extend = true
-			remove(panels, 2)
-			_items.height = full_height
-		end
+		panels = {_items}
 	end
 
 	for idx = 1, #panels do
@@ -1888,7 +1829,7 @@ local function get_panels(player, data, fs, full_height)
 		if is_recipe or is_usage then
 			get_rcp_extra(player, fs, data, panel, is_recipe, is_usage)
 		elseif panel.name == "items" then
-			get_items_fs(fs, data, extend)
+			get_items_fs(fs, data, full_height)
 		elseif panel.name == "title" then
 			get_header(fs, data)
 		elseif panel.name == "favs" then
@@ -2008,7 +1949,7 @@ local function get_waypoint_fs(fs, data, player, yextra, ctn_len)
 
 		fs("tooltip", 0, y, ctn_len - 2.5, 0.65,
 			fmt("Name: %s\nPosition:%s", clr("#ff0", v.name),
-				pos_to_string(v.pos, 0):sub(2,-2):gsub("(%-*%d+)", clr("#ff0", " %1"))))
+				core.pos_to_string(v.pos, 0):sub(2,-2):gsub("(%-*%d+)", clr("#ff0", " %1"))))
 
 		local del = fmt("waypoint_%u_delete", i)
 		fs(fmt("style[%s;fgimg=%s;fgimg_hovered=%s;content_offset=0]", del, PNG.trash, PNG.trash_hover))
@@ -2287,9 +2228,9 @@ function i3.get_tabs()
 	return tabs
 end
 
-function i3.delete_tab(tabname)
+function i3.remove_tab(tabname)
 	if not true_str(tabname) then
-		return err "i3.delete_tab: tab name missing"
+		return err "i3.remove_tab: tab name missing"
 	end
 
 	for i, def in ipairs(tabs) do
@@ -2356,15 +2297,18 @@ local function init_data(player, info)
 	data.favs          = {}
 	data.export_counts = {}
 	data.current_tab   = 1
+	data.current_itab  = 1
 	data.subcat        = 1
 	data.scrbar_inv    = 0
 	data.lang_code     = get_lang_code(info)
+	data.fs_version    = info.formspec_version
 
 	after(0, set_fs, player)
 end
 
 local function reset_data(data)
 	data.filter      = ""
+	data.expand      = ""
 	data.pagenum     = 1
 	data.rnum        = 1
 	data.unum        = 1
@@ -2375,7 +2319,12 @@ local function reset_data(data)
 	data.usages      = nil
 	data.export_rcp  = nil
 	data.export_usg  = nil
+	data.alt_items   = nil
 	data.items       = data.items_raw
+
+	if data.current_itab > 1 then
+		sort_by_category(data)
+	end
 end
 
 local function rcp_fields(player, data, fields)
@@ -2402,6 +2351,10 @@ local function rcp_fields(player, data, fields)
 
 		search(data)
 
+		if data.current_itab > 1 then
+			sort_by_category(data)
+		end
+
 	elseif fields.prev_page or fields.next_page then
 		if data.pagemax == 1 then return end
 		data.pagenum = data.pagenum - (fields.prev_page and 1 or -1)
@@ -2515,9 +2468,9 @@ local function get_inventory_fs(player, data, fs)
 		local textures = concat(t, ","):gsub("!", ",")
 
 		--fs("style[player_model;bgcolor=black]")
-		fs("model", 0.2, 0.2, armor_skin and 4 or 3.4, armor_skin and ctn_hgt or 6.1,
+		fs("model", 0.2, 0.2, armor_skin and 4 or 3.4, ctn_hgt,
 			"player_model", props.mesh, textures, "0,-150", "false", "false",
-			fmt("%u,%u", anim.x, anim.y))
+			fmt("%u,%u%s", anim.x, anim.y, data.fs_version >= 5 and ";30" or ""))
 	else
 		local size = 2.5
 		fs("image", 0.7, 0.2, size, size * props.visual_size.y, props.textures[1])
@@ -2565,9 +2518,7 @@ local function get_inventory_fs(player, data, fs)
 	(max_val * 4) / 12, max_val, 9.8, ctn_hgt, data.scrbar_inv))
 
 	fs(fmt("scroll_container[3.9,0.2;%f,%f;scrbar_inv;vertical]", ctn_len, ctn_hgt))
-
-	get_ctn_content(fs, data, player, yoffset, ctn_len, award_list, awards_unlocked, award_list_nb)
-
+		get_ctn_content(fs, data, player, yoffset, ctn_len, award_list, awards_unlocked, award_list_nb)
 	fs("scroll_container_end[]")
 
 	local btn = {
@@ -2812,18 +2763,6 @@ i3.add_search_filter("groups", function(item, groups)
 	return has_groups
 end)
 
-i3.add_search_filter("types", function(item, drawtypes)
-	local t = {}
-
-	for i, dt in ipairs(drawtypes) do
-		t[i] = (dt == "node" and reg_nodes[item] and 1) or
-		       (dt == "item" and reg_craftitems[item] and 1) or
-		       (dt == "tool" and reg_tools[item] and 1) or nil
-	end
-
-	return #t > 0
-end)
-
 --[[	As `core.get_craft_recipe` and `core.get_all_craft_recipes` do not
 	return the fuel, replacements and toolrepair recipes, we have to
 	override `core.register_craft` and do some reverse engineering.
@@ -2943,14 +2882,14 @@ local function get_init_items()
 			usages  = usages_cache,
 		}
 
-		http.fetch_async{
+		http.fetch_async {
 			url = i3.export_url,
-			post_data = write_json(post_data),
+			post_data = core.write_json(post_data),
 		}
 	end
 end
 
-on_mods_loaded(function()
+core.register_on_mods_loaded(function()
 	get_init_items()
 
 	__sfinv = rawget(_G, "sfinv")
@@ -2974,7 +2913,7 @@ local function init_backpack(player)
 	local data = pdata[name]
 	local inv = player:get_inventory()
 
-	inv:set_size("main", INV_SIZE)
+	inv:set_size("main", data.bag_size and BAG_SIZES[data.bag_size] or INV_SIZE)
 
 	data.bag = create_inventory(fmt("%s_backpack", name), {
 		allow_put = function(_inv, listname, _, stack)
@@ -3015,7 +2954,6 @@ local function init_backpack(player)
 
 	if data.bag_size then
 		data.bag:set_stack("main", 1, fmt("i3:bag_%s", data.bag_size))
-		inv:set_size("main", BAG_SIZES[data.bag_size])
 	end
 end
 
@@ -3040,11 +2978,11 @@ local function init_waypoints(player)
 	end
 end
 
-on_joinplayer(function(player)
+core.register_on_joinplayer(function(player)
 	local name = player:get_player_name()
-	local info = get_player_info(name)
+	local info = core.get_player_information and core.get_player_information(name)
 
-	if get_formspec_version(info) < MIN_FORMSPEC_VERSION then
+	if not info or get_formspec_version(info) < MIN_FORMSPEC_VERSION then
 		if __sfinv then
 			sfinv.set_player_inventory_formspec = old_sfinv_fn
 			sfinv.enabled = true
@@ -3058,6 +2996,8 @@ on_joinplayer(function(player)
 			end
 		end
 
+		pdata[name] = nil
+
 		return outdated(name)
 	end
 
@@ -3111,12 +3051,12 @@ local function save_data(player_name)
 	storage:set_string("pdata", slz(_pdata))
 end
 
-on_leaveplayer(function(player)
+core.register_on_leaveplayer(function(player)
 	local name = player:get_player_name()
 	save_data(name)
 end)
 
-on_shutdown(save_data)
+core.register_on_shutdown(save_data)
 
 local function routine()
 	save_data()
@@ -3125,7 +3065,7 @@ end
 
 after(SAVE_INTERVAL, routine)
 
-on_receive_fields(function(player, formname, fields)
+core.register_on_player_receive_fields(function(player, formname, fields)
 	if formname ~= "" then
 		return false
 	end
@@ -3139,6 +3079,10 @@ on_receive_fields(function(player, formname, fields)
 			local tabname = sub(f, 5)
 			set_tab(player, tabname)
 			break
+		elseif sub(f, 1, 5) == "itab_" then
+			data.pagenum = 1
+			data.current_itab = tonum(f:sub(-1))
+			sort_by_category(data)
 		end
 	end
 
@@ -3170,6 +3114,7 @@ if progressive_mode then
 
 		if is_group(item) then
 			local groups = extract_groups(item)
+
 			for i = 1, inv_items_size do
 				local def = reg_items[inv_items[i]]
 
@@ -3236,6 +3181,7 @@ if progressive_mode then
 
 		for i = 1, #stacks do
 			local stack = stacks[i]
+
 			if not stack:is_empty() then
 				local name = stack:get_name()
 				if reg_items[name] then
@@ -3326,7 +3272,8 @@ if progressive_mode then
 	-- Workaround. Need an engine call to detect when the contents of
 	-- the player inventory changed, instead.
 	local function poll_new_items()
-		local players = get_players()
+		local players = core.get_connected_players()
+
 		for i = 1, #players do
 			local player = players[i]
 			local name = player:get_player_name()
@@ -3346,6 +3293,8 @@ if progressive_mode then
 				end
 
 				data.items_raw = items
+				data.current_itab = 1
+
 				search(data)
 				set_fs(player)
 			end
@@ -3356,8 +3305,9 @@ if progressive_mode then
 
 	poll_new_items()
 
-	globalstep(function()
-		local players = get_players()
+	core.register_globalstep(function()
+		local players = core.get_connected_players()
+
 		for i = 1, #players do
 			local player = players[i]
 			local name = player:get_player_name()
@@ -3371,7 +3321,7 @@ if progressive_mode then
 
 	i3.add_recipe_filter("Default progressive filter", progressive_filter)
 
-	on_joinplayer(function(player)
+	core.register_on_joinplayer(function(player)
 		local name = player:get_player_name()
 		local data = pdata[name]
 
@@ -3417,5 +3367,5 @@ for size, rcp in pairs(bag_recipes) do
 	core.register_craft {type = "fuel", recipe = bagname, burntime = 3}
 end
 
---dofile(core.get_modpath("i3") .. "/test_tabs.lua")
---dofile(core.get_modpath("i3") .. "/test_custom_recipes.lua")
+--dofile(modpath .. "/tests/test_tabs.lua")
+--dofile(modpath .. "/tests/test_custom_recipes.lua")
diff --git a/settingtypes.txt b/settingtypes.txt
index a97f54a..42bc83e 100644
--- a/settingtypes.txt
+++ b/settingtypes.txt
@@ -1,2 +1,5 @@
 # The progressive mode shows recipes you can craft from items you ever had in your inventory.
 i3_progressive_mode    (Learn crafting recipes progressively)    bool false
+
+# Regroup the items of the same type in the item list.
+i3_item_compression    (Regroup items of the same type)    bool true
diff --git a/test_custom_recipes.lua b/tests/test_custom_recipes.lua
similarity index 100%
rename from test_custom_recipes.lua
rename to tests/test_custom_recipes.lua
diff --git a/test_online_recipe.json b/tests/test_online_recipe.json
similarity index 100%
rename from test_online_recipe.json
rename to tests/test_online_recipe.json
diff --git a/test_tabs.lua b/tests/test_tabs.lua
similarity index 100%
rename from test_tabs.lua
rename to tests/test_tabs.lua
diff --git a/textures/i3_tab_small.png b/textures/i3_tab_small.png
new file mode 100644
index 0000000..2a2fc0b
Binary files /dev/null and b/textures/i3_tab_small.png differ
diff --git a/textures/i3_tab_small_hover.png b/textures/i3_tab_small_hover.png
new file mode 100644
index 0000000..102c027
Binary files /dev/null and b/textures/i3_tab_small_hover.png differ