Fix battery holder not accepting technic batteries (#115)

Author: pyrollo

nodes/node_battery_holder.lua

@@ -67,28 +67,11 @@ local def = {
 	-- Allow all items with energy storage to be placed in the inventory
 	allow_metadata_inventory_put = function(pos, listname, _, stack, player)
 		if listname == "batteries" then
-			if not minetest.global_exists("technic") then
-				return 0
-			end
-
-			local node_name = stack:get_name()
-
-			-- Allow all items with energy storage from technic mod
-			if technic.power_tools[node_name] ~= nil then
-				local meta = stack:get_metadata()
-				local md = minetest.deserialize(meta)
-				-- And specifically if they hold any charge
-				-- Disregard empty batteries, the player should know better
-				if md and md.charge > 0 then
-					if digtron.check_protected_and_record(pos, player) then
-						return 0
-					end
-					return stack:get_count()
-				else
+			if minetest.global_exists("technic") and technic.get_charge(stack) > 0 then
+				if digtron.check_protected_and_record(pos, player) then
 					return 0
 				end
-			else
-				return 0
+				return stack:get_count()
 			end
 		end
 		return 0
@@ -116,12 +99,9 @@ local def = {
 			return inv:add_item("batteries", stack)
 		end,
 		can_insert = function(pos, _, stack)
-			local meta = stack:get_metadata()
-			local md = minetest.deserialize(meta)
-			-- And specifically if they hold any charge
 			-- Disregard empty batteries, the player should know better
-			if md and md.charge > 0 then
-				meta = minetest.get_meta(pos)
+			if minetest.global_exists("technic") and technic.get_charge(stack) > 0 then
+				local meta = minetest.get_meta(pos)
 				local inv = meta:get_inventory()
 				return inv:room_for_item("batteries", stack)
 			end

util.lua

@@ -262,17 +262,14 @@ digtron.tap_batteries = function(battery_positions, target, test)
 		end
 
 		for _, itemstack in pairs(invlist) do
-			local meta = minetest.deserialize(itemstack:get_metadata())
-			if (meta ~= nil) then
-				local power_available = math.floor(meta.charge / digtron.config.power_ratio)
+			if minetest.global_exists("technic") then
+				local power_available = math.floor(technic.get_charge(itemstack) / digtron.config.power_ratio)
 				if power_available ~= 0 then
 					local actual_burned = power_available -- we just take all we have from the battery, since they aren't stackable
 					-- don't bother recording the items if we're just testing, nothing is actually being removed.
 					if test ~= true then
 						-- since we are taking everything, the wear and charge can both be set to 0
-						itemstack:set_wear(0)
-						meta.charge = 0
-						itemstack:set_metadata(minetest.serialize(meta))
+						technic.set_charge(itemstack, 0)
 					end
 					current_burned = current_burned + actual_burned
 				end