commit 25b3dc3063930af2a2fdbc1d94292d0b8929964c
Author: Zach Daniel <zach@zachdaniel.dev>
Date:   Fri Jul 21 20:27:52 2023 -0400

    init

diff --git a/.formatter.exs b/.formatter.exs
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index 0000000..3392b8e
--- /dev/null
+++ b/.formatter.exs
@@ -0,0 +1,5 @@
+# Used by "mix format"
+[
+  import_deps: [:ash],
+  inputs: ["{mix,.formatter}.exs", "{config,lib,test}/**/*.{ex,exs}"]
+]
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..a2a9d24
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,26 @@
+# 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").
+ash_double_entry-*.tar
+
+# Temporary files, for example, from tests.
+/tmp/
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..29ee2e2
--- /dev/null
+++ b/README.md
@@ -0,0 +1,21 @@
+# AshDoubleEntry
+
+**TODO: Add description**
+
+## Installation
+
+If [available in Hex](https://hex.pm/docs/publish), the package can be installed
+by adding `ash_double_entry` to your list of dependencies in `mix.exs`:
+
+```elixir
+def deps do
+  [
+    {:ash_double_entry, "~> 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/ash_double_entry>.
+
diff --git a/lib/account/account.ex b/lib/account/account.ex
new file mode 100644
index 0000000..952e6cc
--- /dev/null
+++ b/lib/account/account.ex
@@ -0,0 +1,15 @@
+defmodule AshDoubleEntry.Account do
+  @account %Spark.Dsl.Section{
+    name: :account
+  }
+
+  @sections [@account]
+
+  @transformers [
+    AshDoubleEntry.Account.Transformers.AddStructure
+  ]
+
+  use Spark.Dsl.Extension,
+    sections: @sections,
+    transformers: @transformers
+end
diff --git a/lib/account/transformers/add_structure.ex b/lib/account/transformers/add_structure.ex
new file mode 100644
index 0000000..9d85822
--- /dev/null
+++ b/lib/account/transformers/add_structure.ex
@@ -0,0 +1,17 @@
+defmodule AshDoubleEntry.Account.Transformers.AddStructure do
+  use Spark.Dsl.Transformer
+
+  def transform(dsl) do
+    dsl
+    |> Ash.Resource.Builder.add_attribute(:balance, :decimal,
+      allow_nil?: false,
+      default: Decimal.new(0),
+      writable?: false
+    )
+    |> Ash.Resource.Builder.add_attribute(
+      :currency,
+      :string,
+      allow_nil?: false
+    )
+  end
+end
diff --git a/lib/ash_double_entry.ex b/lib/ash_double_entry.ex
new file mode 100644
index 0000000..29380b8
--- /dev/null
+++ b/lib/ash_double_entry.ex
@@ -0,0 +1,2 @@
+defmodule AshDoubleEntry do
+end
diff --git a/lib/transfer/info.ex b/lib/transfer/info.ex
new file mode 100644
index 0000000..12eb911
--- /dev/null
+++ b/lib/transfer/info.ex
@@ -0,0 +1,3 @@
+defmodule AshDoubleEntry.Transfer.Info do
+  use Spark.InfoGenerator, extension: AshDoubleEntry.Transfer, sections: [:transfer]
+end
diff --git a/lib/transfer/transfer.ex b/lib/transfer/transfer.ex
new file mode 100644
index 0000000..8f90625
--- /dev/null
+++ b/lib/transfer/transfer.ex
@@ -0,0 +1,22 @@
+defmodule AshDoubleEntry.Transfer do
+  @account %Spark.Dsl.Section{
+    name: :transfer,
+    schema: [
+      account_resource: [
+        type: Ash.OptionsHelpers.ash_resource(),
+        doc: "The resource to use for account balances",
+        required: true
+      ]
+    ]
+  }
+
+  @sections [@account]
+
+  @transformers [
+    AshDoubleEntry.Transfer.Transformers.AddStructure
+  ]
+
+  use Spark.Dsl.Extension,
+    sections: @sections,
+    transformers: @transformers
+end
diff --git a/lib/transfer/transformers/add_structure.ex b/lib/transfer/transformers/add_structure.ex
new file mode 100644
index 0000000..e363b31
--- /dev/null
+++ b/lib/transfer/transformers/add_structure.ex
@@ -0,0 +1,18 @@
+defmodule AshDoubleEntry.Transfer.Transformers.AddStructure do
+  use Spark.Dsl.Transformer
+
+  def transform(dsl) do
+    dsl
+    |> Ash.Resource.Builder.add_attribute(:amount, :decimal,
+      allow_nil?: false,
+      default: Decimal.new(0),
+      writable?: false
+    )
+    |> Ash.Resource.Builder.add_attribute(:converted_amount, :decimal, writable?: true)
+    |> Ash.Resource.Builder.add_relationship(
+      :belongs_to,
+      :account,
+      AshDoubleEntry.Transfer.Info.transfer_account_resource(dsl)
+    )
+  end
+end
diff --git a/mix.exs b/mix.exs
new file mode 100644
index 0000000..eae42e2
--- /dev/null
+++ b/mix.exs
@@ -0,0 +1,29 @@
+defmodule AshDoubleEntry.MixProject do
+  use Mix.Project
+
+  def project do
+    [
+      app: :ash_double_entry,
+      version: "0.1.0",
+      elixir: "~> 1.15",
+      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
+    [
+      {:ash, "~> 2.13"}
+      # {:dep_from_hexpm, "~> 0.3.0"},
+      # {:dep_from_git, git: "https://github.com/elixir-lang/my_dep.git", tag: "0.1.0"}
+    ]
+  end
+end
diff --git a/mix.lock b/mix.lock
new file mode 100644
index 0000000..359fab3
--- /dev/null
+++ b/mix.lock
@@ -0,0 +1,16 @@
+%{
+  "ash": {:hex, :ash, "2.13.0", "b4c36748414b64912a77c195e9350dc546fe2461b246b61a272a2d6e9f2d0e14", [:mix], [{:comparable, "~> 1.0", [hex: :comparable, repo: "hexpm", optional: false]}, {:decimal, "~> 2.0", [hex: :decimal, repo: "hexpm", optional: false]}, {:earmark, "~> 1.4", [hex: :earmark, repo: "hexpm", optional: true]}, {:ecto, "~> 3.7", [hex: :ecto, repo: "hexpm", optional: false]}, {:ets, "~> 0.8.0", [hex: :ets, repo: "hexpm", optional: false]}, {:jason, ">= 1.0.0", [hex: :jason, repo: "hexpm", optional: false]}, {:picosat_elixir, "~> 0.2", [hex: :picosat_elixir, repo: "hexpm", optional: false]}, {:plug, ">= 0.0.0", [hex: :plug, repo: "hexpm", optional: true]}, {:spark, ">= 1.1.20 and < 2.0.0-0", [hex: :spark, repo: "hexpm", optional: false]}, {:stream_data, "~> 0.5.0", [hex: :stream_data, repo: "hexpm", optional: false]}, {:telemetry, "~> 1.1", [hex: :telemetry, repo: "hexpm", optional: false]}], "hexpm", "c9211a07154fa477f7696bd70ad66e78fac7a0e80652e62d93eef9821af6dfaf"},
+  "comparable": {:hex, :comparable, "1.0.0", "bb669e91cedd14ae9937053e5bcbc3c52bb2f22422611f43b6e38367d94a495f", [:mix], [{:typable, "~> 0.1", [hex: :typable, repo: "hexpm", optional: false]}], "hexpm", "277c11eeb1cd726e7cd41c6c199e7e52fa16ee6830b45ad4cdc62e51f62eb60c"},
+  "decimal": {:hex, :decimal, "2.1.1", "5611dca5d4b2c3dd497dec8f68751f1f1a54755e8ed2a966c2633cf885973ad6", [:mix], [], "hexpm", "53cfe5f497ed0e7771ae1a475575603d77425099ba5faef9394932b35020ffcc"},
+  "ecto": {:hex, :ecto, "3.10.3", "eb2ae2eecd210b4eb8bece1217b297ad4ff824b4384c0e3fdd28aaf96edd6135", [:mix], [{:decimal, "~> 1.6 or ~> 2.0", [hex: :decimal, repo: "hexpm", optional: false]}, {:jason, "~> 1.0", [hex: :jason, repo: "hexpm", optional: true]}, {:telemetry, "~> 0.4 or ~> 1.0", [hex: :telemetry, repo: "hexpm", optional: false]}], "hexpm", "44bec74e2364d491d70f7e42cd0d690922659d329f6465e89feb8a34e8cd3433"},
+  "elixir_make": {:hex, :elixir_make, "0.7.7", "7128c60c2476019ed978210c245badf08b03dbec4f24d05790ef791da11aa17c", [:mix], [{:castore, "~> 0.1 or ~> 1.0", [hex: :castore, repo: "hexpm", optional: true]}], "hexpm", "5bc19fff950fad52bbe5f211b12db9ec82c6b34a9647da0c2224b8b8464c7e6c"},
+  "ets": {:hex, :ets, "0.8.1", "8ff9bcda5682b98493f8878fc9dbd990e48d566cba8cce59f7c2a78130da29ea", [:mix], [], "hexpm", "6be41b50adb5bc5c43626f25ea2d0af1f4a242fb3fad8d53f0c67c20b78915cc"},
+  "jason": {:hex, :jason, "1.4.1", "af1504e35f629ddcdd6addb3513c3853991f694921b1b9368b0bd32beb9f1b63", [:mix], [{:decimal, "~> 1.0 or ~> 2.0", [hex: :decimal, repo: "hexpm", optional: true]}], "hexpm", "fbb01ecdfd565b56261302f7e1fcc27c4fb8f32d56eab74db621fc154604a7a1"},
+  "nimble_options": {:hex, :nimble_options, "1.0.2", "92098a74df0072ff37d0c12ace58574d26880e522c22801437151a159392270e", [:mix], [], "hexpm", "fd12a8db2021036ce12a309f26f564ec367373265b53e25403f0ee697380f1b8"},
+  "picosat_elixir": {:hex, :picosat_elixir, "0.2.3", "bf326d0f179fbb3b706bb2c15fbc367dacfa2517157d090fdfc32edae004c597", [:make, :mix], [{:elixir_make, "~> 0.6", [hex: :elixir_make, repo: "hexpm", optional: false]}], "hexpm", "f76c9db2dec9d2561ffaa9be35f65403d53e984e8cd99c832383b7ab78c16c66"},
+  "sourceror": {:hex, :sourceror, "0.12.3", "a2ad3a1a4554b486d8a113ae7adad5646f938cad99bf8bfcef26dc0c88e8fade", [:mix], [], "hexpm", "4d4e78010ca046524e8194ffc4683422f34a96f6b82901abbb45acc79ace0316"},
+  "spark": {:hex, :spark, "1.1.20", "48f4dd3bed1e16d43a5084a0277f2d8c3adac9bcfa07dfdac9931b025b75480b", [:mix], [{:nimble_options, "~> 0.5 or ~> 1.0", [hex: :nimble_options, repo: "hexpm", optional: false]}, {:sourceror, "~> 0.1", [hex: :sourceror, repo: "hexpm", optional: false]}], "hexpm", "b48d77cdcbc3f00a6e67f447d9860c390f790baf4e7d879d7c6bfd37109c4659"},
+  "stream_data": {:hex, :stream_data, "0.5.0", "b27641e58941685c75b353577dc602c9d2c12292dd84babf506c2033cd97893e", [:mix], [], "hexpm", "012bd2eec069ada4db3411f9115ccafa38540a3c78c4c0349f151fc761b9e271"},
+  "telemetry": {:hex, :telemetry, "1.2.1", "68fdfe8d8f05a8428483a97d7aab2f268aaff24b49e0f599faa091f1d4e7f61c", [:rebar3], [], "hexpm", "dad9ce9d8effc621708f99eac538ef1cbe05d6a874dd741de2e689c47feafed5"},
+  "typable": {:hex, :typable, "0.3.0", "0431e121d124cd26f312123e313d2689b9a5322b15add65d424c07779eaa3ca1", [:mix], [], "hexpm", "880a0797752da1a4c508ac48f94711e04c86156f498065a83d160eef945858f8"},
+}
diff --git a/test/ash_double_entry_test.exs b/test/ash_double_entry_test.exs
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--- /dev/null
+++ b/test/ash_double_entry_test.exs
@@ -0,0 +1,8 @@
+defmodule AshDoubleEntryTest do
+  use ExUnit.Case
+  doctest AshDoubleEntry
+
+  test "greets the world" do
+    assert AshDoubleEntry.hello() == :world
+  end
+end
diff --git a/test/test_helper.exs b/test/test_helper.exs
new file mode 100644
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+++ b/test/test_helper.exs
@@ -0,0 +1 @@
+ExUnit.start()