quarry.lua

function cPrint(str)
    term.clear()
    term.setCursorPos(1,1)
    print(str)
end

cPrint('starting up quarry!')
os.sleep(1)
cPrint('')

os.loadAPI('nav.lua')
nav.calibrate()

function goBack(functionCalled)
    initx, inity, initz = nav.pos.x, nav.pos.y, nav.pos.z
    if nav.pos.z ~= 0 then
        nav.up(math.abs(nav.pos.z))
    end
    while not nav.pos.dir == 2 do
        nav.turnRight()
    end
    if nav.pos.y ~= 0 then
        nav.forward(math.abs(nav.pos.y))
    end
    if nav.pos.x ~= 0 then
        if nav.pos.x < 0 then
            while nav.pos.dir ~= 1 do
                nav.turnRight()
            end
            nav.forward(math.abs(nav.pos.x))
        else
            while nav.pos.dir ~= 3 do
                nav.turnRight()
            end
            nav.forward(math.abs(nav.pos.x)
        end
    end
    functionCalled()

end

function refuel()
    if turtle.getFuelLevel() < 200 then
        if not turtle.refuel() then
            goBack(grabFuel)
        end
    end
end

function forward(x)
    for i = 1, x do
        nav.forward(1)
        if checkFuel() == then
        end
        if checkInv == then
        end
    end