Add api documentation (#361)

you

2017-06-05 987cc5a6a425b1f9bcd9000608dc389a45c675a1

 technic/machines/register/battery_box.lua

@@ -35,26 +35,38 @@
   }
})

-- x+2 + (z+2)*2
local dirtab = {
   [4] = 2,
   [5] = 3,
   [7] = 1,
   [8] = 0
}

local tube = {
   insert_object = function(pos, node, stack, direction)
      if direction.y == 0 then
      print(minetest.pos_to_string(direction), dirtab[direction.x+2+(direction.z+2)*2], node.param2)
      if direction.y == 1
         or (direction.y == 0 and dirtab[direction.x+2+(direction.z+2)*2] == node.param2) then
         return stack
      end
      local meta = minetest.get_meta(pos)
      local inv = meta:get_inventory()
      if direction.y > 0 then
      if direction.y == 0 then
         return inv:add_item("src", stack)
      else
         return inv:add_item("dst", stack)
      end
   end,
   can_insert = function(pos, node, stack, direction)
      if direction.y == 0 then
      print(minetest.pos_to_string(direction), dirtab[direction.x+2+(direction.z+2)*2], node.param2)
      if direction.y == 1
         or (direction.y == 0 and dirtab[direction.x+2+(direction.z+2)*2] == node.param2) then
         return false
      end
      local meta = minetest.get_meta(pos)
      local inv = meta:get_inventory()
      if direction.y > 0 then
      if direction.y == 0 then
         if meta:get_int("split_src_stacks") == 1 then
            stack = stack:peek_item(1)
         end
@@ -66,7 +78,7 @@
         return inv:room_for_item("dst", stack)
      end
   end,
   connect_sides = {left=1, right=1, back=1, top=1, bottom=1},
   connect_sides = {left=1, right=1, back=1, top=1},
}

local function add_on_off_buttons(meta, ltier, charge_percent)
@@ -219,13 +231,12 @@
      local top_tex = "technic_"..ltier.."_battery_box_top.png"..tube_entry
      local front_tex = "technic_"..ltier.."_battery_box_front.png^technic_power_meter"..i..".png"
      local side_tex = "technic_"..ltier.."_battery_box_side.png"..tube_entry
      local bottom_tex = "technic_"..ltier.."_battery_box_bottom.png"..tube_entry
      local bottom_tex = "technic_"..ltier.."_battery_box_bottom.png"..cable_entry

      if ltier == "lv" then
         top_tex = "technic_"..ltier.."_battery_box_top.png"
         front_tex = "technic_"..ltier.."_battery_box_side.png^technic_power_meter"..i..".png"
         side_tex = "technic_"..ltier.."_battery_box_side.png^technic_power_meter"..i..".png"
         bottom_tex = "technic_"..ltier.."_battery_box_bottom.png"..cable_entry
      end

      minetest.register_node("technic:"..ltier.."_battery_box"..i, {
@@ -271,6 +282,7 @@
         allow_metadata_inventory_take = technic.machine_inventory_take,
         allow_metadata_inventory_move = technic.machine_inventory_move,
         technic_run = run,
         on_rotate = screwdriver.rotate_simple,
         after_place_node = data.tube and pipeworks.after_place,
         after_dig_node = technic.machine_after_dig_node,
         on_receive_fields = function(pos, formname, fields, sender)