coupe.lua

slotSapling = 1
slotCharbon = 2
slotBois = 3
slotCoffre = 5
slotWaipoint = 4

function isBlockType(type)
 turtle.select(type)
 return turtle.compare()
end

function isBlockBelow(type)
 turtle.select(type)
 return turtle.compareDown()
end

while true do
 turtle.forward()
 if not isBlockBelow(slotWaipoint) then
  turtle.back()
  break
 end
end