That works!

I’m still interested if there’s any way to do a file upload into a livebook. Maybe that’s a smart cell or something I could develop?

I am also using Livebook, and you can find my 2022 notebook here: advent-of-code/advent_of_code_2022.livemd at main · bmitc/advent-of-code · GitHub

Warning: Solutions are there for days 1 and 2.

In particular, I am using a Utilities module to provide the data input file reading:

defmodule Utilities do
  @moduledoc """
  Provides utility functions to be used across days
  """

  @doc """
  Reads the given day's data file of "day_<zero padded day number>_input.txt" as
  a stream
  """
  @spec readDataStream(integer()) :: Stream.t()
  def readDataStream(day) do
    day_as_string =
      day
      |> Integer.to_string()
      |> String.pad_leading(2, "0")

    Path.join(__DIR__, "../data/day_#{day_as_string}_input.txt")
    |> Path.expand()
    |> File.stream!()
    |> Stream.map(&String.trim/1)
  end
end

I download all of the input files and name them as day_<number>_input.txt. For example, day_01_input.txt. I put them in a data folder up a level from the notebook because the intention is to potentially support several languages but keep the input files in a single location for a given year.

I also have tests setup to help in refactoring after I have solved a puzzle.

ExUnit.start(autorun: false)

defmodule AdventOfCode.Tests do
  use ExUnit.Case, async: true

  test "Day 1" do
    assert Day1.part_one() == # redacted
    assert Day1.part_two() == # redacted
  end

  test "Day 2" do
    assert Day2.PartOne.solution() == # redacted
    assert Day2.PartTwo.solution() == # redacted
  end
end

ExUnit.run()

I’m using kino_aoc. A very handy tool imo.