item_drop/init.lua

local load_time_start = minetest.get_us_time()
pickup_radius = tonumber(minetest.settings:get("item_pickup_radius"))

if minetest.settings:get_bool("item_drop.enable_item_pickup") ~= false or
minetest.settings:get_bool("enable_item_pickup") ~= false then
	local pickup_gain = tonumber(
		minetest.settings:get("item_drop.pickup_sound_gain")) or
		tonumber(minetest.settings:get("item_pickup_gain")) or 0.2
	local pickup_radius = tonumber(
		minetest.settings:get("item_drop.pickup_radius")) or 0.75
	local magnet_radius = tonumber(
		minetest.settings:get("item_drop.magnet_radius")) or -1
	local magnet_time = tonumber(
		minetest.settings:get("item_drop.magnet_time")) or 5.0
	local pickup_age = tonumber(
		minetest.settings:get("item_drop.pickup_age")) or 0.5
	local key_triggered = minetest.settings:get_bool(
		"item_drop.enable_pickup_key") or
		minetest.settings:get_bool("enable_item_pickup_key") ~= false
	local key_invert = minetest.settings:get_bool(
		"item_drop.pickup_keyinvert") or false
	local keytype
	if key_triggered then
		keytype = minetest.settings:get("item_drop.pickup_keytype") or
		minetest.settings:get("item_pickup_keytype") or "Use"
		-- disable pickup age if picking is explicitly enabled by the player
		if not key_invert then
			pickup_age = math.min(pickup_age, 0)
		end
	end

	local magnet_mode = magnet_radius > pickup_radius
	local zero_velocity_mode = pickup_age == -1
	if magnet_mode
	and zero_velocity_mode then
		error"zero velocity mode can't be used together with magnet mode"
	end

	-- adds the item to the inventory and removes the object
	local function collect_item(ent, pos, player)
		minetest.sound_play("item_drop_pickup", {
			pos = pos,
			gain = pickup_gain,
		})
		ent:on_punch(player)
	end

	-- opt_get_ent gets the object's luaentity if it can be collected
	local opt_get_ent
	if zero_velocity_mode then
		function opt_get_ent(object)
			if object:is_player()
			or not vector.equals(object:getvelocity(), {x=0, y=0, z=0}) then
				return
			end
			local ent = object:get_luaentity()
			if not ent
			or ent.name ~= "__builtin:item"
			or ent.itemstring == "" then
				return
			end
			return ent
		end
	else
		function opt_get_ent(object)
			if object:is_player() then
				return
			end
			local ent = object:get_luaentity()
			if not ent
			or ent.name ~= "__builtin:item"
			or (ent.dropped_by and ent.age < pickup_age)
			or ent.itemstring == "" then
				return
			end
			return ent
		end
	end

	local afterflight
	if magnet_mode then
		-- take item or reset velocity after flying a second
		function afterflight(object, inv, player)
			-- TODO: test what happens if player left the game
			local ent = opt_get_ent(object)
			if not ent then
				return
			end
			local item = ItemStack(ent.itemstring)
			if inv
			and inv:room_for_item("main", item) then
				collect_item(ent, object:get_pos(), player)
			else
				object:setvelocity({x=0,y=0,z=0})
				ent.physical_state = true
				ent.object:set_properties({
					physical = true
				})
			end
		end
	end

	-- set keytype to the key name if possible
	if keytype == "Use" then
		keytype = "aux1"
	elseif keytype == "Sneak" then
		keytype = "sneak"
	elseif keytype == "LeftAndRight" then -- LeftAndRight combination
		keytype = 0
	elseif keytype == "SneakAndRMB" then -- SneakAndRMB combination
		keytype = 1
	end


	-- tests if the player has the keys pressed to enable item picking
	local function has_keys_pressed(player)
		if not key_triggered then
			return true
		end

		local control = player:get_player_control()
		local keys_pressed
		if keytype == 0 then -- LeftAndRight combination
			keys_pressed = control.left and control.right
		elseif keytype == 1 then -- SneakAndRMB combination
			keys_pressed = control.sneak and control.RMB
		else
			keys_pressed = control[keytype]
		end

		return keys_pressed ~= key_invert
	end

	-- called for each player to possibly collect an item, returns true if so
	local function pickupfunc(player)
		if not has_keys_pressed(player)
		or not minetest.get_player_privs(player:get_player_name()).interact
		or player:get_hp() <= 0 then
			return
		end

		local pos = player:getpos()
		pos.y = pos.y+0.5
		local inv

		local objectlist = minetest.get_objects_inside_radius(pos,
			magnet_mode and magnet_radius or pickup_radius)
		for i = 1,#objectlist do
			local object = objectlist[i]
			local ent = opt_get_ent(object)
			if ent then
				if not inv then
					inv = player:get_inventory()
					if not inv then
						minetest.log("error", "[item_drop] Couldn't " ..
							"get inventory")
						return
					end
				end
				local item = ItemStack(ent.itemstring)
				if inv:room_for_item("main", item) then
					local flying_item
					local pos2
					if magnet_mode then
						pos2 = object:getpos()
						flying_item = vector.distance(pos, pos2) > pickup_radius
					end
					if not flying_item then
						-- collect one item at a time to avoid the loud pop
						collect_item(ent, pos, player)
						return true
					end
					local vel = vector.multiply(
						vector.subtract(pos, pos2), 3)
					vel.y = vel.y + 0.6
					object:setvelocity(vel)
					if ent.physical_state then
						ent.physical_state = false
						ent.object:set_properties({
							physical = false
						})

						minetest.after(magnet_time, afterflight,
							object, inv, player)
					end
				end
			end
		end
	end

	local function pickup_step()
		local got_item
		local players = minetest.get_connected_players()
		for i = 1,#players do
			got_item = got_item or pickupfunc(players[i])
		end
		-- lower step if takeable item(s) were found
		local time
		if got_item then
			time = 0.02
		else
			time = 0.2
		end
		minetest.after(time, pickup_step)
	end
	minetest.after(3.0, pickup_step)
end

if minetest.settings:get_bool("item_drop.enable_item_drop") ~= false or
minetest.settings:get_bool("enable_item_drop") ~= false
and not minetest.settings:get_bool("creative_mode") then
	function minetest.handle_node_drops(pos, drops)
		for i = 1,#drops do
			local item = drops[i]
			local count, name
			if type(item) == "string" then
				count = 1
				name = item
			else
				count = item:get_count()
				name = item:get_name()
			end

			for _ = 1,count do
				local obj = minetest.add_item(pos, name)
				if not obj then
					error("Couldn't spawn item")
				end

				local vel = obj:getvelocity()
				local x = math.random(-5, 4)
				if x >= 0 then
					x = x+1
				end
				vel.x = 1 / x
				local z = math.random(-5, 4)
				if z >= 0 then
					z = z+1
				end
				vel.z = 1 / z
				obj:setvelocity(vel)
			end
		end
	end
end


local time = (minetest.get_us_time() - load_time_start) / 1000000
local msg = "[item_drop] loaded after ca. " .. time .. " seconds."
if time > 0.01 then
	print(msg)
else
	minetest.log("info", msg)
end