chopper

local function checkFuel()
  if turtle.getFuelLevel() < 1 then
    turtle.select(1)
    turtle.refuel(1)
  end
end
--
local function Saplings()
  print "Make sure Saplings are in Slot 16"
  sleep(1)
  Saplings = tonumber(turtle.getItemCount(16))
  if Saplings > 3 then
    print "Something is in Slot 16.\nLet's hope that are saplings ;)"
  else
    print "Need at least 4 saplings in Slot 16"
      while Saplings < 4 do
        Saplings = tonumber(turtle.getItemCount(16))
        sleep(0)
      end
  end
end
--
local function Ask()
  term.clear()
  term.setCursorPos(1,1)
  sleep(1)
  print "Enable Bonemeal? [y/n]"
  bm = read()
end
--
local function CheckInput()
  if bm == "y" or bm == "yes" or bm == "n" or bm == "no" then
    print("Input '" .. bm .. "'accepted")
  else
    error("Invalid Input! Ending program...",0)
  end
end
--
local function ConvertInput()
  if bm == "y" or bm == "yes" then
    bm = true
    toDrop = 14
  elseif bm == "n" or bm == "no" then
    bm = false
    toDrop = 15
  end
bm1 = tostring(bm)
print("bm = " .. bm1)
print("Drop =" .. toDrop)
end
--
local function Start()
  turtle.dig()
  checkFuel()
  turtle.forward()
end
--
local function FellUp()
up = 0
  while turtle.detectUp() do
    turtle.digUp()
    turtle.dig()
    checkFuel()
    turtle.up()
    up = up + 1
  end
end
--
local function Move()
  turtle.dig()
  checkFuel()
  turtle.turnRight()
  turtle.dig()
  turtle.forward()
  turtle.turnLeft()
end
--
local function FellDown()
  while up > 0 do
    turtle.dig()
    turtle.digDown()
    checkFuel()
    turtle.down()
    up = up - 1
  end
end
--
local function Plant() --That's a mess. Sorry :)
  turtle.dig()
  checkFuel()
  turtle.up()
  turtle.select(16)
  turtle.placeDown()
  checkFuel()
  turtle.forward()
  turtle.select(16)
  turtle.placeDown()
  turtle.turnLeft()
  checkFuel()
  turtle.forward()
  turtle.select(16)
  turtle.placeDown()
  turtle.turnLeft()
  checkFuel()
  turtle.forward()
  turtle.select(16)
  turtle.placeDown()
  checkFuel()
  turtle.forward()
  checkFuel()
  turtle.turnRight()
  turtle.down()
  turtle.turnRight()
end
--
local function GetDrop()
print(toDrop)
  if not toDrop == 14 and not toDrop == 15 then
    DropInvalid = 1
    while DropInvalid == 1 do
    print "Something went wrong. Unable to drop."
    print "Drop everything? [y/n]"
    DropAll = read()
      if DropAll == y or DropAll == yes then
        for i = 1,16 do
          turtle.select(i)
          turtle.drop()
        end
        DropInvalid = 0
      elseif DropAll == n or DropAll == no then
        print "Returning to start.\nPlease empty the inventory."
        turtle.turnRight()
        DropInvaild = 0
      else
        print "Invalid Input! Reloading"
        term.clear()
        term.setCursorPos(1,1)
        sleep(1)
        DropInvalid = 1 --Still 1
      end
    end
  end
end
--
local function Drop()
  for i = 2,toDrop do
    turtle.select(i)
    turtle.dropDown()
  end
end
--
local function MovetoChest()
  move = 10
  checkFuel()
  while move > 0 do
    checkFuel()
    turtle.forward()
    move = move - 1
  end
end
--
local function CheckRes()
  if bm == true then
  bmCount = turtle.getItemCount(15)
  end
  SaplingCount = turtle.getItemCount(16)
  print(bmCount)
  print(SaplingCount)
end
--
local function Decide()
  if bmCount < 2 and bm == true then
    NeedBonemeal = 1
  else
    NeedBonemeal = 0
  end
  if SaplingCount < 4 then
    NeedSaplings = 1
  else
    NeedSaplings = 0
  end
end
--Begin
Saplings()
Ask()
CheckInput()
ConvertInput()
Start()
FellUp()
Move()
FellDown()
Plant()
print(Drop)
GetDrop()
Drop()
CheckRes()
Decide()
  if Needbm == 1 or NeedSaplings == 1 then
    MovetoChest()
    GetRes = 1
  else
    turtle.turnRight()
    GetRes = 0
  end
print(Needbm)
print(NeedSaplings)
print(GetRes)