treeFarm

local up = 0
local right_movement = 0
local last = "left"

function getTree()
    turtle.dig()
    turtle.forward()

    while turtle.detectUp() do
        turtle.digUp()
        turtle.up()
        up = up + 1
    end
    repeat
        turtle.down()
        up = up - 1
    until up == 0
    turtle.digDown()
    turtle.select(1)
    turtle.placeDown()
end

function back(amount)
    local _back = 0
    repeat
        turtle.back()
        _back = _back + 1
    until _back == amount
end
function forward(amount)
    local _forward = 0
    repeat
        turtle.forward()
        _forward = _forward + 1
    until _forward == amount
end

function start()
    turtle.turnLeft()
    turtle.forward()
    for q=4,16 do
        turtle.select(q)
        turtle.dropDown()
    end
    back(2)
    turtle.select(1)
    turtle.suckDown(25)

    back(3)

    turtle.select(2)
    turtle.suckDown(25)

    back(3)

    turtle.select(3)
    turtle.suckDown(25)

    forward(7)
    turtle.turnRight()
end

function walk()
    local forward = 0
    repeat
        if turtle.forward() == false then
            getTree()
        else
            forward = forward + 1
        end
    until forward == 21
end

function moveRight()
    turtle.turnRight()
    forward(3)
    turtle.turnRight()
    right_movement = right_movement + 1
    last = "right"
end
function moveLeft()
    turtle.turnLeft()
    forward(3)
    turtle.turnLeft()
    right_movement = right_movement + 1
    last = "left"

end

start()
turtle.up()
repeat
    walk()
    if last == "left" then
        moveRight()
    elseif last == "right" then
        moveLeft()
    end
until right_movement == 5