mine.lua

function digF()
    while(turtle.detect())
    do
        turtle.dig()
    end
    turtle.forward()
end

function corr(length)
    for i=1,length do
        digF()
        turtle.digDown()
        turtle.digUp()
    end
end

function strip(length, width)
    for i=1, width do
        corr(length)
        turtle.turnLeft()
        digF()
        turtle.digUp()
        turtle.digDown()
        turtle.turnLeft()
        corr(length)
        turtle.turnRight()
        digF()
        turtle.digUp()
        turtle.digDown()
        turtle.turnRight()
    end
end

function staircase(depth)
    for i=1,depth do
        turtle.digDown()
        turtle.down()
        for j=1,3 do
            digF()
        end
        turtle.turnLeft()
        digF()
        turtle.turnLeft()
        for j=1,3 do
            digF()
        end
        turtle.turnLeft()
        turtle.forward()
        turtle.turnLeft()
        turtle.forward()
    end
end

--staircase(3)

strip(10, 10)