stripmine.lua

local depth = 20
local placeTorch = 5
local switch = false

function digForward()
    while turtle.detect() == true
    do
        turtle.dig()
    end
end

function digDepth()
    for i = 1, depth
    do
        dig2by1()
    end
end

function dig2by1()
    turtle.up()
    placeTorchPlease()
    digForward()
    turtle.forward()
    turtle.digDown()
    turtle.down()
end

function placeTorchPlease()
    if placeTorch == 5
    then
        turtle.placeDown()
        placeTorch = 1
    else
        placeTorch = placeTorch + 1
    end
end

function moveNextStrip()
    turtle.turnRight()
    turtle.forward()
    turtle.forward()
    turtle.forward()
    turtle.turnLeft()
    turtle.turnLeft()
end

function dig1by5()
    for i = 1, 5
    do
        digForward()
        if i == 5
        then
            print("dont move forward")
        else
            turtle.forward()
        end
    end
    for i = 1, 4
    do
        turtle.back()
    end
end

function mineStrip()
    turtle.turnLeft()
    dig1by5()
    turtle.turnLeft()
    turtle.turnLeft()
    dig1by5()
end

function mineStrips()
    for i = 1, 7
    do
        mineStrip()
        moveNextStrip()
    end
end

--START MAIN PROCEDURE

digDepth()
turtle.up()
dig1by5()
mineStrips()
turtle.forward()

--END MAIN PROCEDURE