local function visualize(table, prep)
  local ret = ""
  if prep == nil then
    prep = "-"
  end
  for i, k in pairs(table) do
    if type(k) == "table" then
      ret = ret .. prep .. i .. "\n" .. visualize(k, prep .. prep)
    else
      ret = ret .. prep .. i .. " " .. tostring(k) .. "\n"
    end
  end
  return ret
end

function sparktech.debug(thing)
   if type(thing) == "table" then
      minetest.debug(visualize(thing))
   else
      minetest.debug(thing)
   end
end