Add Vacuum cleaner

A power tool that picks up entities in a certain radius. Useful when
paired with the chainsaw.

technic/tools/init.lua

@@ -14,6 +14,7 @@ dofile(path.."/chainsaw.lua")
 dofile(path.."/tree_tap.lua")
 dofile(path.."/sonic_screwdriver.lua")
 dofile(path.."/prospector.lua")
+dofile(path.."/vacuum.lua")
 
 if minetest.get_modpath("screwdriver") then
 	-- compatibility alias

technic/tools/vacuum.lua

@@ -0,0 +1,56 @@
+-- Configuration
+local vacuum_max_charge        = 10000 -- 10000 - Maximum charge of the vacuum cleaner
+local vacuum_charge_per_object = 100   -- 100   - Capable of picking up 50 objects
+local vacuum_range             = 6     -- 6     - Area in which to pick up objects
+
+local S = technic.getter
+
+technic.register_power_tool("technic:vacuum", vacuum_max_charge)
+
+minetest.register_tool("technic:vacuum", {
+	description = S("Vacuum Cleaner"),
+	inventory_image = "technic_vacuum.png",
+	stack_max = 1,
+	wear_represents = "technic_RE_charge",
+	on_refill = technic.refill_RE_charge,
+	on_use = function(itemstack, user, pointed_thing)
+		local meta = minetest.deserialize(itemstack:get_metadata())
+		if not meta or not meta.charge then
+			return
+		end
+		
+		local pos = user:getpos()
+		local inv = user:get_inventory()
+		for _, object in ipairs(minetest.env:get_objects_inside_radius(pos, vacuum_range)) do
+			local luaentity = object:get_luaentity()
+			if not object:is_player() and luaentity and luaentity.name == "__builtin:item" and luaentity.itemstring ~= "" then
+				if inv and inv:room_for_item("main", ItemStack(luaentity.itemstring)) then
+					meta.charge = meta.charge - vacuum_charge_per_object
+					if meta.charge < vacuum_charge_per_object then
+						return
+					end
+					inv:add_item("main", ItemStack(luaentity.itemstring))
+					minetest.sound_play("item_drop_pickup", {
+						to_player = user:get_player_name(),
+						gain = 0.4,
+					})
+					luaentity.itemstring = ""
+					object:remove()
+				end
+			end
+		end
+		
+		technic.set_RE_wear(itemstack, meta.charge, vacuum_max_charge)
+		itemstack:set_metadata(minetest.serialize(meta))
+		return itemstack
+	end,
+})
+
+minetest.register_craft({
+	output = 'technic:vacuum',
+	recipe = {
+		{'pipeworks:tube_1',              'pipeworks:filter', 'technic:battery'},
+		{'pipeworks:tube_1',              'technic:motor',    'technic:battery'},
+		{'technic:stainless_steel_ingot', '',                 ''},
+	}
+})