Chop

function refuel()
  if(turtle.getFuelLevel() < 10000) then
   for i = 4, 16 do
     turtle.select(i)
     if(turtle.compareTo(1)) then
       turtle.refuel()
     end
   end
  end
   turtle.select(1)
end

function dropOff()
  for i = 4, 16 do
    turtle.select(i)
    turtle.dropDown()
  end
  turtle.select(1)
end

function getSaplings()
  turtle.select(2)
  turtle.suckDown()
  dropOff()
  turtle.select(1)
end

local function goForward()
 while not turtle.forward() do
  turtle.dig()
  turtle.attack()
 end
end

function detectTree()
 turtle.select(1)
    if turtle.compare() then
        return true
    else
        return false
    end
end

function turn(dir)
    if dir == "right" then
        turtle.turnRight()
    else
        turtle.turnLeft()
    end
end

function turnForward(dir)
    turn(dir)
    forward(3)
    turn(dir)
end

function placeSapling(dir)
    turtle.select(2)
 if(turtle.getItemCount() > 1) then
      turtle.place()
 end
    turtle.select(1)
    turn(dir)
end

function chopTree(dir)
    turtle.select(1)
    turtle.dig()
    goForward()
    while turtle.compareUp() do
        turtle.digUp()
        turtle.up()
    end
    turtle.select(3)
    while not turtle.compareDown() do
  turtle.digDown()
        turtle.down()
    end
 turtle.select(1)
 while not turtle.back() do
   turtle.turnRight()
   turtle.turnRight()
   turtle.dig()
   turtle.turnLeft()
   turtle.turnLeft()
 end
    placeSapling(dir)
end

function chopOrPlace(dir)
    if(detectTree()) then
        chopTree(dir)
    else
        placeSapling(dir)
    end
end

function forward(amount)
    for i = 1, amount do
        turtle.turnLeft()
        chopOrPlace("right")

        turtle.turnRight()
        chopOrPlace("left")

        if i ~= amount then
            goForward()
        end
    end
end

function placePath()
  while true do
   forward(15)
      for i = 1, 2 do
          turnForward("right")
          forward(14)
          turnForward("left")
          forward(14)
      end
      turnForward("right")
      forward(15)
   goForward()
   turtle.turnRight()
   for i = 1, 10 do
     goForward()
   end
   turtle.turnRight()
   goForward()
   refuel()
   getSaplings()
 end
end

placePath()