Infra

.envrc

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+use flake
+export AOC_SESSION=$(cat session)

.formatter.exs

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+# Used by "mix format"
+[
+  inputs: ["{mix,.formatter}.exs", "{config,lib,test}/**/*.{ex,exs}"]
+]

.gitignore

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+# The directory Mix will write compiled artifacts to.
+/_build/
+
+# If you run "mix test --cover", coverage assets end up here.
+/cover/
+
+# The directory Mix downloads your dependencies sources to.
+/deps/
+
+# Where third-party dependencies like ExDoc output generated docs.
+/doc/
+
+# Ignore .fetch files in case you like to edit your project deps locally.
+/.fetch
+
+# If the VM crashes, it generates a dump, let's ignore it too.
+erl_crash.dump
+
+# Also ignore archive artifacts (built via "mix archive.build").
+*.ez
+
+# Ignore package tarball (built via "mix hex.build").
+aoc2023-*.tar
+
+# Temporary files, for example, from tests.
+/tmp/
+.direnv
+/.nix-mix
+/.nix-hex
+
+/inputs
+session

README.md

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+# Aoc2023
+
+**TODO: Add description**
+
+## Installation
+
+If [available in Hex](https://hex.pm/docs/publish), the package can be installed
+by adding `aoc2023` to your list of dependencies in `mix.exs`:
+
+```elixir
+def deps do
+  [
+    {:aoc2023, "~> 0.1.0"}
+  ]
+end
+```
+
+Documentation can be generated with [ExDoc](https://github.com/elixir-lang/ex_doc)
+and published on [HexDocs](https://hexdocs.pm). Once published, the docs can
+be found at <https://hexdocs.pm/aoc2023>.
+

flake.lock

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+{
+  "nodes": {
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1700794826,
+        "narHash": "sha256-RyJTnTNKhO0yqRpDISk03I/4A67/dp96YRxc86YOPgU=",
+        "path": "/nix/store/6h04ab83y72nm16hh9g3llgg0s296ynl-source",
+        "rev": "5a09cb4b393d58f9ed0d9ca1555016a8543c2ac8",
+        "type": "path"
+      },
+      "original": {
+        "id": "nixpkgs",
+        "type": "indirect"
+      }
+    },
+    "root": {
+      "inputs": {
+        "nixpkgs": "nixpkgs",
+        "systems": "systems"
+      }
+    },
+    "systems": {
+      "locked": {
+        "lastModified": 1681028828,
+        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
+        "owner": "nix-systems",
+        "repo": "default",
+        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
+        "type": "github"
+      },
+      "original": {
+        "id": "systems",
+        "type": "indirect"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

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+{
+  outputs = { self, nixpkgs, systems }: {
+    devShells = nixpkgs.lib.genAttrs (import systems) (system: {
+      default = nixpkgs.legacyPackages.${system}.beam.packages.erlang_26.callPackage ./shell.nix {};
+    });
+  };
+}

lib/aoc2023.ex

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+defmodule Aoc2023 do
+  defmacro __using__([]) do
+    quote do
+      import Aoc2023.Common
+
+      def main(input) do
+        parsed = parse(input)
+        IO.puts("Part 1: #{part1(parsed)}")
+        IO.puts("Part 2: #{part2(parsed)}")
+      end
+    end
+  end
+end

lib/common.ex

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+defmodule Aoc2023.Common do
+end

lib/day1.ex

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+defmodule Aoc2023.Day1 do
+  use Aoc2023
+
+  def parse(input) do
+    input
+  end
+
+  def part1(input) do
+    nil
+  end
+
+  def part2(input) do
+    nil
+  end
+end

lib/mix_tasks.ex

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+defmodule Mix.Tasks.Aoc do
+  use Mix.Task
+
+  defp module(1), do: Aoc2023.Day1
+  # [MODULE INSERTION POINT]  
+
+  defp base_dir(), do: System.get_env("AOC_BASE")
+
+  defp tests(day) do
+    File.ls!(tests_dir(day)) |> Enum.filter(&(not String.contains?(&1, ".")))
+  end
+
+  defp read(path) do
+    f = File.open!(path, [:utf8])
+    contents = IO.read(f, :eof)
+    :ok = File.close(f)
+    contents
+  end
+
+  defp test(day, test) do
+    f = "#{tests_dir(day)}#{test}"
+
+    {
+      test,
+      read(f),
+      if File.exists?(f <> ".1") do
+        read(f <> ".1")
+      else
+        nil
+      end,
+      if File.exists?(f <> ".2") do
+        read(f <> ".2")
+      else
+        nil
+      end
+    }
+  end
+
+  defp tests_dir(day), do: "#{base_dir()}/tests/day#{day}/"
+
+  defp create_file(path, contents) do
+    File.mkdir_p!(Path.dirname(path))
+    f = File.open!(path, [:exclusive, :utf8])
+    IO.write(f, contents)
+    :ok = File.close(f)
+  end
+
+  def run(params) do
+    {opts, params} = params |> OptionParser.parse!(strict: [day: :integer])
+    day = opts |> Keyword.get(:day, Date.utc_today().day)
+    run(day, params)
+  end
+
+  defp run(day, ["new"]) do
+    create_file("#{base_dir()}/lib/day#{day}.ex", """
+    defmodule Aoc2023.Day#{day} do
+    	use Aoc2023
+    	def parse(input) do
+    		input
+    	end
+    	def part1(input) do
+    		input
+    	end
+    	def part2(input) do
+    		input
+    	end
+    end
+    """)
+
+    this_file = "#{base_dir()}/lib/mix_tasks.ex"
+
+    contents =
+      read(this_file)
+      |> String.replace(
+        "\n  # [MODULE INSERTION POINT]",
+        "\n  defp module(#{day}), do: Aoc2023.Day#{day}\n  # [MODULE INSERTION POINT]"
+      )
+
+    f = File.open!(this_file, [:write, :utf8])
+    IO.write(f, contents)
+    :ok = File.close(f)
+  end
+
+  defp run(day, ["test", "new"]) do
+    last = tests(day) |> Enum.map(&String.to_integer(&1)) |> Enum.max(empty_fallback: fn -> 1 end)
+    create_file("#{tests_dir(day)}#{last + 1}", IO.read(:stdio, :eof))
+  end
+
+  defp run(day, ["test", "expected", test, part]) do
+    create_file("#{tests_dir(day)}#{test}.#{part}", IO.read(:stdio, :eof))
+  end
+
+  defp run(day, ["test"]) do
+    mod = module(day)
+    tests = tests(day)
+
+    tests
+    |> Enum.map(&test(day, &1))
+    |> Enum.map(fn {test, input, p1e, p2e} ->
+      parsed = mod.parse(input)
+      p1 = mod.part1(parsed)
+
+      if p1e do
+        if to_string(p1) != p1e do
+          IO.puts("Failed at #{test}.1: expected #{p1e}, got:")
+          dbg(p1)
+        end
+      else
+        IO.puts("Test #{test}.1")
+        dbg(p1)
+      end
+
+      p2 = mod.part2(parsed)
+
+      if p2e do
+        if to_string(p2) != p2e do
+          IO.puts("Failed at #{test}.2: expected #{p2e}, got:")
+          dbg(p2)
+        end
+      else
+        IO.puts("Test #{test}.2")
+        dbg(p2)
+      end
+    end)
+  end
+
+  defp run(day, ["run"]) do
+    run(day, ["fetch"])
+    run_file(day, "#{base_dir()}/inputs/day#{day}")
+  end
+
+  defp run(day, ["run", "-"]) do
+    run_file(day)
+  end
+
+  defp run(day, ["fetch"]) do
+    file = "#{base_dir()}/inputs/day#{day}"
+
+    if not File.exists?(file) do
+      HTTPoison.start()
+
+      resp =
+        HTTPoison.get!("https://adventofcode.com/2023/day/#{day}/input",
+          "user-agent": "aoc-ex by ben@soroos.net",
+          cookie: "session=#{System.get_env("AOC_SESSION")}"
+        )
+
+      create_file(file, resp.body)
+    end
+  end
+
+  defp run_file(day, file \\ nil) do
+    module(day).main(if file, do: read(file), else: IO.read(:stdio, :eof))
+  end
+end

mix.exs

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+defmodule Aoc2023.MixProject do
+  use Mix.Project
+
+  def project do
+    [
+      app: :aoc2023,
+      version: "0.1.0",
+      elixir: "~> 1.15",
+      start_permanent: Mix.env() == :prod,
+      deps: deps()
+    ]
+  end
+
+  def application do
+    [
+      extra_applications: [:logger]
+    ]
+  end
+
+  defp deps do
+    [
+      {:httpoison, "~> 2.0"}
+    ]
+  end
+end

mix.lock

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+%{
+  "certifi": {:hex, :certifi, "2.12.0", "2d1cca2ec95f59643862af91f001478c9863c2ac9cb6e2f89780bfd8de987329", [:rebar3], [], "hexpm", "ee68d85df22e554040cdb4be100f33873ac6051387baf6a8f6ce82272340ff1c"},
+  "hackney": {:hex, :hackney, "1.20.1", "8d97aec62ddddd757d128bfd1df6c5861093419f8f7a4223823537bad5d064e2", [:rebar3], [{:certifi, "~> 2.12.0", [hex: :certifi, repo: "hexpm", optional: false]}, {:idna, "~> 6.1.0", [hex: :idna, repo: "hexpm", optional: false]}, {:metrics, "~> 1.0.0", [hex: :metrics, repo: "hexpm", optional: false]}, {:mimerl, "~> 1.1", [hex: :mimerl, repo: "hexpm", optional: false]}, {:parse_trans, "3.4.1", [hex: :parse_trans, repo: "hexpm", optional: false]}, {:ssl_verify_fun, "~> 1.1.0", [hex: :ssl_verify_fun, repo: "hexpm", optional: false]}, {:unicode_util_compat, "~> 0.7.0", [hex: :unicode_util_compat, repo: "hexpm", optional: false]}], "hexpm", "fe9094e5f1a2a2c0a7d10918fee36bfec0ec2a979994cff8cfe8058cd9af38e3"},
+  "httpoison": {:hex, :httpoison, "2.2.1", "87b7ed6d95db0389f7df02779644171d7319d319178f6680438167d7b69b1f3d", [:mix], [{:hackney, "~> 1.17", [hex: :hackney, repo: "hexpm", optional: false]}], "hexpm", "51364e6d2f429d80e14fe4b5f8e39719cacd03eb3f9a9286e61e216feac2d2df"},
+  "idna": {:hex, :idna, "6.1.1", "8a63070e9f7d0c62eb9d9fcb360a7de382448200fbbd1b106cc96d3d8099df8d", [:rebar3], [{:unicode_util_compat, "~> 0.7.0", [hex: :unicode_util_compat, repo: "hexpm", optional: false]}], "hexpm", "92376eb7894412ed19ac475e4a86f7b413c1b9fbb5bd16dccd57934157944cea"},
+  "metrics": {:hex, :metrics, "1.0.1", "25f094dea2cda98213cecc3aeff09e940299d950904393b2a29d191c346a8486", [:rebar3], [], "hexpm", "69b09adddc4f74a40716ae54d140f93beb0fb8978d8636eaded0c31b6f099f16"},
+  "mimerl": {:hex, :mimerl, "1.2.0", "67e2d3f571088d5cfd3e550c383094b47159f3eee8ffa08e64106cdf5e981be3", [:rebar3], [], "hexpm", "f278585650aa581986264638ebf698f8bb19df297f66ad91b18910dfc6e19323"},
+  "parse_trans": {:hex, :parse_trans, "3.4.1", "6e6aa8167cb44cc8f39441d05193be6e6f4e7c2946cb2759f015f8c56b76e5ff", [:rebar3], [], "hexpm", "620a406ce75dada827b82e453c19cf06776be266f5a67cff34e1ef2cbb60e49a"},
+  "ssl_verify_fun": {:hex, :ssl_verify_fun, "1.1.7", "354c321cf377240c7b8716899e182ce4890c5938111a1296add3ec74cf1715df", [:make, :mix, :rebar3], [], "hexpm", "fe4c190e8f37401d30167c8c405eda19469f34577987c76dde613e838bbc67f8"},
+  "unicode_util_compat": {:hex, :unicode_util_compat, "0.7.0", "bc84380c9ab48177092f43ac89e4dfa2c6d62b40b8bd132b1059ecc7232f9a78", [:rebar3], [], "hexpm", "25eee6d67df61960cf6a794239566599b09e17e668d3700247bc498638152521"},
+}

shell.nix

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+{
+  lib,
+  pkgs,
+  mkShell,
+  elixir,
+  elixir-ls,
+  inotify-tools,
+}:
+mkShell {
+  packages =
+    [elixir elixir-ls]
+    ++ lib.lists.optional (pkgs.system == "x86_64-linux") inotify-tools
+    ++ lib.lists.optionals (pkgs.system == "aarch64-darwin") (with pkgs.darwin.apple_sdk.frameworks; [
+      CoreFoundation
+      CoreServices
+    ]);
+  shellHook = ''
+    mkdir -p .nix-mix
+    mkdir -p .nix-hex
+    export MIX_HOME=$PWD/.nix-mix
+    export HEX_HOME=$PWD/.nix-hex
+    export AOC_BASE=$PWD
+  '';
+}