limit the upgrade slot to one item per slot, as more are ignored anyway

Tim

2015-02-05 6ef34388329902bdf08922a21169232c79b9c2a4

 technic/machines/register/common.lua

@@ -101,12 +101,11 @@
   if node.param2 == 0 then pos1.x = pos1.x + 1  x_velocity =  1 end

   local output_tube_connected = false
   local meta1 = minetest.get_meta(pos1) 
   if meta1:get_int("tubelike") == 1 then
   local node1 = minetest.get_node(pos1) 
   if minetest.get_item_group(node1.name, "tubedevice") > 0 then
      output_tube_connected = true
   end
   tube_time = meta:get_int("tube_time")
   tube_time = tube_time + tube_upgrade
   local tube_time = meta:get_int("tube_time") + tube_upgrade
   if tube_time >= 2 then
      tube_time = 0
      if output_tube_connected then
@@ -122,33 +121,40 @@
   local inv = meta:get_inventory()
   if not inv:is_empty("src") or not inv:is_empty("dst") or
      not inv:is_empty("upgrade1") or not inv:is_empty("upgrade2") then
      minetest.chat_send_player(player:get_player_name(),
         S("Machine cannot be removed because it is not empty"))
      if player then
         minetest.chat_send_player(player:get_player_name(),
            S("Machine cannot be removed because it is not empty"))
      end
      return false
   else
      return true
   end
end

local function inv_change(pos, player, count)
local function inv_change(pos, player, count, from_list, to_list)
   if minetest.is_protected(pos, player:get_player_name()) then
      minetest.chat_send_player(player:get_player_name(),
         S("Inventory move disallowed due to protection"))
      return 0
   end
   if to_list == "upgrade1" or to_list == "upgrade2" then
      -- only place a single item into it, if it's empty
      local empty = minetest.get_meta(pos):get_inventory():is_empty(to_list)
      return empty and 1 or 0
   end
   return count
end

function technic.machine_inventory_put(pos, listname, index, stack, player)
   return inv_change(pos, player, stack:get_count())
   return inv_change(pos, player, stack:get_count(), nil, listname)
end

function technic.machine_inventory_take(pos, listname, index, stack, player)
   return inv_change(pos, player, stack:get_count())
   return inv_change(pos, player, stack:get_count(), listname, nil)
end

function technic.machine_inventory_move(pos, from_list, from_index,
      to_list, to_index, count, player)
   return inv_change(pos, player, count)
   return inv_change(pos, player, count, from_list, to_list)
end