Minetest autodoor ABM

minetest .register_abm {
  label  = 'automatic doors',
  nodenames  = { 'paradroid_mt:autodoor_closed',
                 'paradroid_mt:autodoor_cracked',
                 'paradroid_mt:autodoor_ajar',
                 'paradroid_mt:autodoor_open' }, -- group:door  ??

  interval  = 0.25,
  chance  = 1,

  action  = function(pos, node, active_object_count, active_object_count_wider)
    local name  = node .name
    local vacant  = true

    if active_object_count_wider > 0 then
      print('wider ' ..active_object_count_wider) -- reports back every mouse on level
      local entities  = minetest .get_objects_inside_radius(pos, 1)
      --print('found ' ..#entities ..' entities at ' ..dump(pos))

      for entity = 1,  #entities do
        vacant  = false
        if name == 'paradroid_mt:autodoor_ajar' then
          minetest .set_node( pos,  {name = 'paradroid_mt:autodoor_open' })
        elseif name == 'paradroid_mt:autodoor_cracked' then
          minetest .set_node( pos,  {name = 'paradroid_mt:autodoor_ajar' })
        elseif name == 'paradroid_mt:autodoor_closed' then
          minetest .set_node( pos,  {name = 'paradroid_mt:autodoor_cracked' })
        end -- if name

      end -- entities

    elseif vacant then

      if name == 'paradroid_mt:autodoor_cracked' then
        minetest .set_node( pos,  {name = 'paradroid_mt:autodoor_closed' })
      elseif name == 'paradroid_mt:autodoor_ajar' then
        minetest .set_node( pos,  {name = 'paradroid_mt:autodoor_cracked' })
      elseif name == 'paradroid_mt:autodoor_open' then
        minetest .set_node( pos,  {name = 'paradroid_mt:autodoor_ajar' })
      end -- if name

    end -- if active_object_count_wider()

  end -- action
}