chore: scaffold project

2021/.formatter.exs

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

2021/.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").
+advent_of_code-*.tar
+
+
+# Temporary files for e.g. tests
+/tmp

2021/.tool-versions

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+erlang 24.1.4
+elixir 1.12.3-otp-24

2021/README.md

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+# Advent of Code 2021
+
+<details>
+  <summary>Setup</summary>
+
+  Using [asdf]:
+
+  ```sh
+  asdf plugin add erlang
+  asdf plugin add elixir
+  asdf install
+  ```
+</details>
+
+|  S  |  M  |  T  |  W  |  T  |  F  |  S  |
+| :-: | :-: | :-: | :-: | :-: | :-: | :-: |
+|     |     |     |  1  |  2  |  3  |  4  |
+|  5  |  6  |  7  |  8  |  9  | 10  | 11  |
+| 12  | 13  | 14  | 15  | 16  | 17  | 18  |
+| 19  | 20  | 21  | 22  | 23  | 24  | 25  |
+
+[asdf]: https://asdf-vm.com/#/

2021/lib/advent_of_code.ex

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+defmodule AdventOfCode do
+  @moduledoc """
+  Documentation for `AdventOfCode`.
+  """
+
+  @doc """
+  Hello world.
+
+  ## Examples
+
+      iex> AdventOfCode.hello()
+      :world
+
+  """
+  def hello do
+    :world
+  end
+end

2021/lib/mix/advent_of_code.ex

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+defmodule Mix.AdventOfCode do
+  @moduledoc """
+  Helpers for `AdventOfCode` mix tasks.
+  """
+end

2021/lib/mix/tasks/advent_of_code.gen.solution.exs

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+defmodule Mix.Tasks.AdventOfCode.Gen.Solution do
+  use Mix.Task
+  import Mix.Generator
+
+  @shortdoc "Generate a new solution module"
+
+  @moduledoc """
+  #{@shortdoc}.
+
+  Includes new solution module, test, and empty problem input.
+
+  ## Examples
+
+      # Generate solution modules, tests, and empty input for Day 2
+      $ mix advent_of_code.gen.solution 2
+  """
+
+  @impl Mix.Task
+  def run(_args) do
+  end
+end

2021/lib/mix/tasks/advent_of_code.solve.exs

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+defmodule Mix.Tasks.AdventOfCode.Solve do
+  use Mix.Task
+
+  @shortdoc "Runs solution code with problem input"
+
+  @moduledoc """
+  #{@shortdoc}.
+
+  ## Examples
+
+      # Run Day 2, Part 1 solution program
+      $ mix advent_of_code.solve 2.1
+  """
+
+  @impl Mix.Task
+  def run(_args) do
+  end
+end

2021/mix.exs

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+defmodule AdventOfCode.MixProject do
+  use Mix.Project
+
+  def project do
+    [
+      app: :advent_of_code,
+      version: "0.1.0",
+      elixir: "~> 1.11",
+      start_permanent: Mix.env() == :prod,
+      deps: deps()
+    ]
+  end
+
+  # Run "mix help compile.app" to learn about applications.
+  def application do
+    [
+      extra_applications: [:logger]
+    ]
+  end
+
+  # Run "mix help deps" to learn about dependencies.
+  defp deps do
+    [
+      # {:dep_from_hexpm, "~> 0.3.0"},
+      # {:dep_from_git, git: "https://github.com/elixir-lang/my_dep.git", tag: "0.1.0"}
+    ]
+  end
+end

2021/test/advent_of_code_test.exs

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+defmodule AdventOfCodeTest do
+  use ExUnit.Case
+  doctest AdventOfCode
+
+  test "greets the world" do
+    assert AdventOfCode.hello() == :world
+  end
+end

2021/test/test_helper.exs

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+ExUnit.start()