Set up project

.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").
+djot-*.tar
+
+# Temporary files, for example, from tests.
+/tmp/

.rtx.toml

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+[tools]
+elixir = "1.15.7-otp-26"
+erlang = "26.1.2"
+rust = "1.73.0"

README.md

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+# Djot
+
+A fast [Djot](https://djot.net) parser and formatter for Elixir.

lib/djot.ex

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

mix.exs

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+defmodule Djot.MixProject do
+  use Mix.Project
+
+  @source_url "https://github.com/paradox460/djot"
+
+  def project do
+    [
+      app: :djot,
+      version: "2023.11.0",
+      elixir: "~> 1.15",
+      start_permanent: Mix.env() == :prod,
+      source_url: @source_url,
+      homepage_url: @source_url,
+      name: "Djot",
+      description: "A Djot parser and formatter",
+      deps: deps()
+    ]
+  end
+
+  def package do
+    [
+      maintainers: ["Jeff Sandberg"],
+      licenses: ["MIT"],
+      links: %{
+        GitHub: @source_url
+      }
+    ]
+  end
+
+  def application do
+    [
+      extra_applications: [:logger]
+    ]
+  end
+
+  defp deps do
+    [
+      {:rustler, "~> 0.30.0"}
+    ]
+  end
+end

mix.lock

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+%{
+  "jason": {:hex, :jason, "1.4.1", "af1504e35f629ddcdd6addb3513c3853991f694921b1b9368b0bd32beb9f1b63", [:mix], [{:decimal, "~> 1.0 or ~> 2.0", [hex: :decimal, repo: "hexpm", optional: true]}], "hexpm", "fbb01ecdfd565b56261302f7e1fcc27c4fb8f32d56eab74db621fc154604a7a1"},
+  "rustler": {:hex, :rustler, "0.30.0", "cefc49922132b072853fa9b0ca4dc2ffcb452f68fb73b779042b02d545e097fb", [:mix], [{:jason, "~> 1.0", [hex: :jason, repo: "hexpm", optional: false]}, {:toml, "~> 0.6", [hex: :toml, repo: "hexpm", optional: false]}], "hexpm", "9ef1abb6a7dda35c47cfc649e6a5a61663af6cf842a55814a554a84607dee389"},
+  "toml": {:hex, :toml, "0.7.0", "fbcd773caa937d0c7a02c301a1feea25612720ac3fa1ccb8bfd9d30d822911de", [:mix], [], "hexpm", "0690246a2478c1defd100b0c9b89b4ea280a22be9a7b313a8a058a2408a2fa70"},
+}

test/djot_test.exs

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

test/test_helper.exs

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+ExUnit.start()