4x2 Tree Farm

--checks what can be crafted and to drop it
function dropOff()
    for i = 1, 16 do
        turtle.select(i)
        if turtle.getSelectedSlot() then
            turtle.drop(64)
        end
    end
    turtle.select(1)
end
--code that breaks trees
function logCode()
    turtle.dig()
    turtle.forward()
    turtle.select(1)

    while turtle.compareUp() do
        turtle.digUp()
        turtle.up()
    end

    while turtle.detectDown() == false do
        turtle.down()
    end
end

function forward(move)
    for i = 1, move do
        turtle.forward()
    end
end

function left(turn)
    for i = 1, turn do
        turtle.turnLeft()
    end
end
function right(turn)
    for i = 1, turn do
        turtle.turnRight()
    end
end

logCode()
forward(3)
logCode()
turtle.back()
right(1)
forward(4)
left(1)
logCode()
right(2)
forward(2)
logCode()
left(1)
forward(4)
right(1)
logCode()