sampleDrill

--functions
local function building()
--phase 1
    if turtle.inspectDown()==false then
        turtle.select(6)
        turtle.placeDown()
    end
    turtle.select(1)
    turtle.placeUp()
    turtle.select(2)
    turtle.dropUp()
    redstone.setOutput("top",true)
    os.sleep(1)
    redstone.setOutput("top",false)
    turtle.forward()
    turtle.up()
    turtle.select(3)
    turtle.placeUp()

    turtle.down()
    turtle.back()
--phase 2
    os.sleep(31)

    turtle.select(1)
    turtle.digUp()
    turtle.up()
end

local function veinValidation()
--vein validation
    local s=""
    s = peripheral.call("top","getVeinUnlocalizedName")

    if s == nill then
        turtle.select(5)
        turtle.placeDown()
    else
        turtle.select(4)
        turtle.placeDown(s)
    end

    turtle.select(2)
    turtle.digUp()
    turtle.forward()
    turtle.select(3)
    turtle.digUp()
    turtle.down()

end

local function nextChunk()
    local j = 1
    while j <= 15 do
        j = j + 1
        turtle.forward()
    end
end
--execution

local i = 0
while i < 30 do

    i = i + 1

    building()
    veinValidation()

    if i%10==0 and i~=0 then
        turtle.turnLeft()
        turtle.forward()
    else
        if i%5==0 and i~=0 then
            turtle.turnRight()
            turtle.forward()
        end
    end

    nextChunk()

    if i%10==0 and i~=0 then
        turtle.turnLeft()
        turtle.forward()
    else
        if i%5==0 and i~=0 then
            turtle.turnRight()
            turtle.forward()
        end
    end

end