ComputerCraft MobOff

range = 17

function guaranteed_forward()
    while true do
        if (turtle.forward() == true) then
            return
        end
    end
end

function guaranteed_place(direction)
    if(direction == 0) then
        while (turtle.compare() == false ) do
            turtle.place()
        end
    end
    if(direction == 1) then
        while (turtle.compareDown() == false ) do
            turtle.placeDown()
        end
    end
    return
end

off = false

while true do
    os.pullEvent("redstone")
    if(redstone.getInput("back")) then
        guaranteed_forward();
        for i = 1, range, 1 do
            guaranteed_forward();
            turtle.turnLeft();
            turtle.turnLeft();
            guaranteed_place(0);
            if(i ~= range and (i-1) % 2 == 0) then
                guaranteed_place(1);
            end
            turtle.turnLeft();
            turtle.turnLeft();
        end
    end
    if(redstone.getInput("front")) then
        turtle.turnLeft();
        turtle.turnLeft();
        turtle.dig();
        guaranteed_forward();
        for i = 1, range - 1, 1 do
            turtle.dig();
            turtle.digDown();
            guaranteed_forward();
        end
        guaranteed_forward();
        turtle.turnLeft();
        turtle.turnLeft();
    end
end