dig

arg = { ... }
userLength=arg[1]
userWidth=arg[2]
userHight=arg[3]

if arg[1]==nil or arg[2]==nil or arg[3]==nil then
    term.clear()
    term.setCursorPos(1,1)
    print("starts digging in the bottom, left, closest corner. Fuel will need to be in the first slot.")
    term.setCursorPos(1,5)
    print("dig <length> <width> <higth>")
    return
end

if (arg[3]%3)~=0 then
    print("plz select a height divided by 3")
    return
end

neededFuel = (userWidth*userLength+(userWidth-1)+(userLength-1)-1)*userHight/3+(userHight-2)*2
divHigh = (userHight/3)-1

function move()
    mined=1
    while mined > 0 do
        if turtle.forward() == false then
            turtle.attack()
            turtle.dig()
            mined = mined + 1
        end
        mined = mined - 1
    end
end

function turning()
    if boleonTurn==true then
        turtle.turnLeft()
        move()
        turtle.turnLeft()
    else
        turtle.turnRight()
        move()
        turtle.turnRight()
    end
    turtle.digUp()
    turtle.digDown()
    if boleonTurn==true then
        boleonTurn=false
    else
    boleonTurn=true
    end
end

function dig()
    for i=2,userLength do
        move()
        turtle.digUp()
        turtle.digDown()
    end
end

function backToStart()
    if 0==userWidth%2 then
        turtle.turnRight()
        for i=2,userWidth do
            move()
        end
        turtle.turnRight()
    else
        turtle.turnLeft()
        turtle.turnLeft()
        for i=2,userLength do
            move()
        end
        turtle.turnRight()
        for i=2,userWidth do
            move()
        end
        turtle.turnRight()
    end
end

function newLayer(thisManyUp)
    for i=1,thisManyUp do
        mined=1
        while mined > 0 do
            if turtle.up() == false then
                turtle.attackUp()
                turtle.digUp()
                mined = mined + 1
            end
            mined = mined - 1
        end
    end
    boleonTurn=false
end

function layer()
    for i=2,userWidth do
        dig()
        turning()
    end
    dig()
end

function turtleDown()
    for i=3,userHight do
        turtle.down()
    end
    return
end

function fuel()
    while neededFuel>=turtle.getFuelLevel() do
        turtle.select(1)
        turtle.refuel(1)
    end
end

fuel()
newLayer(1)
layer()
while divHigh >= 1 do
    backToStart()
    newLayer(3)
    layer()
    divHigh=divHigh-1
end
backToStart()
turtleDown()