SugarCactii.lua

-- Check if we are in the correct starting location
function checkForStart()
    turtle.select(16)
    return turtle.compareUp() and
        turtle.compareDown()
end

function refuelIfNeeded()
    turtle.select(1)
    while turtle.getFuelLevel() < 100 do
        turtle.suckUp(1)
        turtle.refuel(1)
    end
end

function forward(n)
    local i = 0
    while i < n do
        if turtle.detect() then
            turtle.dig()
        end
        turtle.forward()
        if turtle.detectDown() then
            turtle.digDown()
        end
        i = i+1
    end
end

function dump(i,j)
    while i <= j do
        if turtle.getItemCount(i) > 0 then
            turtle.select(i)
            turtle.dropDown()
        end
        i = i+1
    end
    turtle.select(1)
end

function lap()
    if not checkForStart() then
        print "Wrong position"
        return
    end
    refuelIfNeeded()
    turtle.forward()
    turtle.turnLeft()
    forward(32)
    turtle.turnLeft()
    forward(2)
    turtle.turnLeft()
    forward(32)
    turtle.turnLeft()
    turtle.forward()
    dump(1,15)
end

while 1+1 == 2 do
    lap()
    sleep(300)
end