goto

local tArgs = { ... }
x1 = tonumber(tArgs[1])
y1 = tonumber(tArgs[2])
z1 = tonumber(tArgs[3])
fxyz = tArgs[4]
print("target: "..x1..", "..y1..", "..z1)
---- functions ----

function locate()
 x, y, z = gps.locate()
end

function locate1()
 locate()
 x2=tonumber(x)
 y2=tonumber(y)
 z2=tonumber(z)
 e=0
 while turtle.detect() do
  turtle.turnRight()
  e=e+1
  if e > 3 then
   print("all sides blocked")
   return
  end
 end
 while not turtle.forward() do
  sleep(1)
 end
 locate()
 if z < z2 then
  f="north"
 elseif x > x2 then
  f="east"
 elseif z > z2 then
  f="south"
 elseif x < x2 then
  f="west"
 end
end


function facing(f1)
 -- locate1()
 print("facing actually to: "..f)
 print("turning facing to "..f1)
 if f1 == "north" then
  if f == "north" then
  elseif f == "east" then
   turtle.turnRight()
   turtle.turnRight()
   turtle.turnRight()
  elseif f == "south" then
   turtle.turnRight()
   turtle.turnRight()
  elseif f == "west" then
   turtle.turnRight()
  end
  f="north"
 end
 if f1 == "east" then
  if f == "north" then
   turtle.turnRight()
  elseif f == "east" then
  elseif f == "south" then
   turtle.turnRight()
   turtle.turnRight()
   turtle.turnRight()
  elseif f == "west" then
   turtle.turnRight()
   turtle.turnRight()
  end
  f="east"
 end
 if f1 == "south" then
  if f == "north" then
   turtle.turnRight()
   turtle.turnRight()
  elseif f == "east" then
   turtle.turnRight()
  elseif f == "south" then
  elseif f == "west" then
   turtle.turnRight()
   turtle.turnRight()
   turtle.turnRight()
  end
  f="south"
 end
 if f1 == "west" then
  if f == "north" then
   turtle.turnRight()
   turtle.turnRight()
   turtle.turnRight()
  elseif f == "east" then
   turtle.turnRight()
   turtle.turnRight()
  elseif f == "south" then
   turtle.turnRight()
  elseif f == "west" then
  end
  f="west"
 end
end

---------------------------

x=false
y=false
z=false
locate()
if x then
 print("position: "..x..", "..y..", "..z)
 x2=tonumber(x)
 y2=tonumber(y)
 z2=tonumber(z)
 e=0
 while turtle.detect() do
  turtle.turnRight()
  e=e+1
  if e > 3 then
   print("all sides blocked. couldn't determine")
   return
  end
 end
 while not turtle.forward() do
  sleep(1)
 end
 locate()
 if z < z2 then
  f="north"
 elseif x > x2 then
  f="east"
 elseif z > z2 then
  f="south"
 elseif x < x2 then
  f="west"
 end
 while y < 100 do
  while not turtle.up() do
   sleep(1)
  end
  y=y+1
 end
 locate()
 if x1 < x then
  f1="west"
  facing(f1)
  while x > x1 do
   while not turtle.forward() do
    sleep(0.5)
   end
   x=x-1
  end
 elseif x1 > x then
  f1="east"
  facing(f1)
  while x < x1 do
   while not turtle.forward() do
    sleep(0.5)
   end
   x=x+1
  end
 end
 if z1 > z then
  f1="south"
  facing(f1)
  while z < z1 do
   while not turtle.forward() do
    sleep(0.5)
   end
   z=z+1
  end
 elseif z1 < z then
  f1="north"
  facing(f1)
  while z > z1 do
   while not turtle.forward() do
    sleep(0.5)
   end
   z=z-1
  end
 end
 locate()
 print("position: "..x..", "..y..", "..z)
 while y > y1 do
  while not turtle.down() do
   sleep(0.5)
  end
  y=y-1
 end
 if not fxyz then
 else
  facing(fxyz)
 end
else
 print("location not found")
end