Simple workbench by MirceaKitsune

mods/workbench/README.md

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+minetest_mods_workbench
+=======================
+
+Workbench mod for Minetest

mods/workbench/depends.txt

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+default 

mods/workbench/init.lua

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+-- Workbench mod by MirceaKitsune
+
+-- Inventory crafting grid size. Use nil to leave the default formspec untouched, recommended if other mods change the inventory window.
+local INVENTORY_CRAFT = 2
+
+--
+-- Internal workbench functions:
+--
+
+local function move_items(s_inv, s_listname, d_inv, d_listname)
+	local s_size = s_inv:get_size(s_listname)
+	for i = 1, s_size do
+		local stack = s_inv:get_stack(s_listname, i)
+		if stack and not stack:is_empty() then
+			d_inv:add_item(d_listname, stack)
+		end
+	end
+	s_inv:set_list(s_listname, {})
+end
+
+local inventory_persistence = {}
+
+local function inventory_set_size(player, size)
+	size = math.min(6, math.max(1, size))
+	local inv = player:get_inventory()
+	if inv:get_size("craft") ~= size*size then
+		move_items(inv, "craft", inv, "main")
+		inv:set_size("craft", size*size)
+		inv:set_width("craft", size)
+	end
+end
+
+local function inventory_set_formspec(player, size)
+	size = math.min(6, math.max(1, size))
+	local inv = player:get_inventory()
+	local msize_x = math.min(inv:get_size("main"), 8)
+	local msize_y = math.min(math.ceil(inv:get_size("main") / 8), 4)
+	local fsize_x = math.max(msize_x, size + 2)
+	local fsize_y = msize_y + size + 1.25
+
+	local formspec = "size["..fsize_x..","..fsize_y.."]"
+	..default.gui_bg
+	..default.gui_bg_img
+	..default.gui_slots
+	.."list[current_player;main;"..(fsize_x-msize_x)..","..(fsize_y-msize_y)..";"..msize_x..",1;]"
+	.."list[current_player;main;"..(fsize_x-msize_x)..","..(fsize_y-msize_y+1.25)..";"..msize_x..","..(msize_y - 1)..";"..msize_x.."]"
+	.."list[current_player;craft;"..(fsize_x-size-2)..",0;"..size..","..size..";]"
+	.."list[current_player;craftpreview;"..(fsize_x-1)..","..(size/2-0.5)..";1,1;]"
+	for i = 0, msize_x - 1, 1 do
+		formspec = formspec.."image["..(fsize_x-msize_x + i)..","..(fsize_y-msize_y)..";1,1;gui_hb_bg.png]"
+	end
+	player:set_inventory_formspec(formspec)
+end
+
+local function inventory_set(player, size)
+	local name = player:get_player_name()
+	local inv = player:get_inventory()
+
+	-- When size is a number, we want to presist inventory settings and activate the workbench settings
+	-- When size is nil, we want to re-activate the persisted inventory settings
+	if not size then
+		inv:set_size("craft", inventory_persistence[name].craft_size)
+		inv:set_width("craft", inventory_persistence[name].craft_width)
+		player:set_inventory_formspec(inventory_persistence[name].formspec)
+		inventory_persistence[name] = nil
+	else
+		inventory_persistence[name] = {}
+		inventory_persistence[name].craft_size = inv:get_size("craft")
+		inventory_persistence[name].craft_width = inv:get_width("craft")
+		inventory_persistence[name].formspec = player:get_inventory_formspec()
+
+		inventory_set_size(player, size)
+		inventory_set_formspec(player, size)
+	end
+end
+
+minetest.register_on_joinplayer(function(player)
+	if minetest.setting_getbool("creative_mode") then
+		inventory_set_size(player, 3)
+	elseif INVENTORY_CRAFT then
+		minetest.after(0, function()
+			inventory_set_size(player, INVENTORY_CRAFT)
+			inventory_set_formspec(player, INVENTORY_CRAFT)
+		end)
+	end
+end)
+
+minetest.register_on_player_receive_fields(function(player, formname, fields)
+	if formname == "workbench:workbench" and fields.quit then
+		inventory_set(player, _)
+	end
+end)
+
+--
+-- Item definitions:
+--
+
+minetest.register_node("workbench:3x3", {
+	description = "WorkBench",
+	tiles = {"workbench_3x3_top.png", "workbench_3x3_bottom.png", "workbench_3x3_side.png",
+		"workbench_3x3_side.png", "workbench_3x3_side.png", "workbench_3x3_front.png"},
+	paramtype2 = "facedir",
+	groups = {choppy=2,oddly_breakable_by_hand=2},
+	legacy_facedir_simple = true,
+	sounds = default.node_sound_wood_defaults(),
+	on_construct = function(pos)
+		local meta = minetest.get_meta(pos)
+		meta:set_string("infotext", "Workbench")
+	end,
+	on_rightclick = function(pos, node, clicker)
+		inventory_set(clicker, 3)
+		minetest.show_formspec(clicker:get_player_name(), "workbench:workbench", clicker:get_inventory_formspec())
+	end,
+})
+
+minetest.register_craft({
+	output = 'workbench:3x3',
+	recipe = {
+		{'group:wood', 'group:wood', ''},
+		{'group:wood', 'group:wood', ''},
+		{'', '', ''},
+	}
+})