mining_program

function isfull()
    for i=1,16,1 do
        if turtle.getItemSpace(i) > 0 then
            return false
        end
    end
    return true
end

function dig_blocs()
    if turtle.detect() == true then
        turtle.dig()
    end
    turtle.up()
    if turtle.detect() == true then
        turtle.dig()
    end
    turtle.up()
    if turtle.detect() == true then
        turtle.dig()
    end
    turtle.down()
    turtle.down()
end

function get_back(home)
    local position = vector.new(gps.locate(5))
    turtle.turnLeft()
    turtle.turnLeft()
    while position.y ~= home.y do
        turtle.down()
    end
    position.y = home.y
    if not x then
        print("Lost")
        return 0
    end
    while position ~= home do
        if turtle.getFuelLevel() < 3 then
            reload_fuel(2)
        end
        turtle.forward()
    end
end

function check_level(fuel_slot)
    turtle.select(fuel_slot)
    return turtle.getItemCount()
end

function reload_fuel(fuel_slot)
    local previous_slot = turtle.getSelectedSlot()
    turtle.select(fuel_slot)
    turtle.refuel(1)
    turtle.select(previous_slot)
end

function main()
    local upordown = false
    local home = gps.locate()
    local args = { ... }
    if table.getn(args) < 1 then
        print("Depth of mining is required as arg. 1")
        return 1
    end
    local depth = tonumber(args[1])
    for i=1,depth,1 do
        if turtle.getFuelLevel() < 3 then
            reload_fuel(2)
        end
        dig_blocs()
        turtle.forward()
        upordown = not upordown
        if check_level(2) < 5 then
            get_back(home)
        end
    end
    get_back(home)
end

main()