all = {
    "wool:white", "wool:grey", "wool:black", "wool:red", "wool:yellow",
    "wool:green", "wool:cyan", "wool:blue", "wool:magenta", "wool:orange",
    "wool:violet", "wool:brown", "wool:pink", "wool:dark_grey", "wool:dark_green"}

rainbow = {
   "wool:yellow", "wool:orange", "wool:red", "wool:magenta", "wool:cyan", "wool:blue"}

candy = {
   "wool:blue", "wool:white"}


schirm = {
   "wool:yellow", "wool:white", "wool:grey"}
local structdef = {
   axiom = "",
   materials = all--{ "wool:white", "wool:red", "wool:orange"}
}

local schirmli = function()
   tmp = ""--Y-15AR"
   for j=1,8 do
   for i=1,15 do
      tmp=tmp.."0M[Z111ARGGGGGGGGGGGGGG]X3AR"
   end
   for i=1,15 do
      tmp=tmp.."1M[Z111ARGGGGGGGGGGGGGG]X3AR"
   end
   end
   return tmp
end

local stiel = function()
   tmp = "2MZ10ARX75ARGGGGGGGGGGGGGGGGGGGGGGGGGGGGG[GGG]"
   return tmp
end

local candycane = function ()
   tmp = "Z21ARX44AR"
   seg = "0M[Z90ARGG]1M[Z-90ARGG]"

   for i = 1, 1200 do
      tmp=tmp.."[X"..tostring((i%90)*4).."AR"..seg.."]"
      if i%20==0 then
     if i>700 then
        tmp = tmp.."Z8ARG"
     else
        tmp = tmp.."G"
     end
      end
   end
   return tmp
end

turtletool = {
   inventory_image = "default_stick.png",
   on_use = function(itemstack, user, pointed_thing)
      if pointed_thing.type == "node" then
     local pos = pointed_thing.above
     minetest.env:spawn_turtle(pos, structdef)
     --print(structdef.axiom)
      end
   end
}

minetest.register_tool("turtle:go", turtletool)