improvement: add Igniter installer task (#61)

* improvement: add Igniter installer task

* check uniqueness when adding to list

* fix dialyzer warnings

* add better checks when adding to AshPostgres

* change append_ to prepend_new_to_list

* add info/2 and use find_and_update_or_create

* use new find_module utilities

* fix add_to_ash_postgres

* prefix unused variable

* use add_dep instead of add_dependency

lib/mix/tasks/ash_money.add_to_ash_postgres.ex

@@ -0,0 +1,54 @@
+defmodule Mix.Tasks.AshMoney.AddToAshPostgres do
+  @moduledoc "Adds AshMoney.AshPostgresExtension to installed_extensions and installs :ex_money_sql."
+  @shortdoc @moduledoc
+  require Igniter.Code.Common
+  use Igniter.Mix.Task
+
+  @impl Igniter.Mix.Task
+  def igniter(igniter, _argv) do
+    repo_module_name = Igniter.Code.Module.module_name("Repo")
+
+    igniter
+    |> Igniter.Project.Deps.add_dep({:ex_money_sql, "~> 1.0"})
+    |> Igniter.apply_and_fetch_dependencies()
+    |> Igniter.Code.Module.find_and_update_module!(repo_module_name, fn zipper ->
+      case Igniter.Code.Module.move_to_use(zipper, AshPostgres.Repo) do
+        # discarding since we just needed to check that `use AshPostgres.Repo` exists
+        {:ok, _zipper} ->
+          case Igniter.Code.Module.move_to_def(zipper, :installed_extensions, 0) do
+            {:ok, zipper} ->
+              case Igniter.Code.Common.move_right(zipper, &Igniter.Code.List.list?/1) do
+                {:ok, zipper} ->
+                  case Igniter.Code.List.append_new_to_list(
+                         zipper,
+                         AshMoney.AshPostgresExtension
+                       ) do
+                    {:ok, zipper} ->
+                      {:ok, zipper}
+
+                    _ ->
+                      {:error,
+                       "couldn't append `AshMoney.AshPostgresExtension` to #{inspect(repo_module_name)}.installed_extensions/0"}
+                  end
+
+                :error ->
+                  {:error,
+                   "#{inspect(repo_module_name)}.installed_extensions/0 doesn't return a list"}
+              end
+
+            _ ->
+              Igniter.Code.Common.add_code(zipper, """
+              def installed_extensions do
+                # Add extensions here, and the migration generator will install them.
+                [AshMoney.AshPostgresExtension]
+              end
+              """)
+          end
+
+        _ ->
+          {:error, "Couldn't find `use AshPostgres.Repo` in #{inspect(repo_module_name)}"}
+      end
+    end)
+    |> Igniter.add_task("ash.codegen", ["install_ash_money_extension"])
+  end
+end

lib/mix/tasks/ash_money.install.ex

@@ -0,0 +1,63 @@
+defmodule Mix.Tasks.AshMoney.Install do
+  @moduledoc "Installs AshMoney. Should be run with `mix igniter.install ash_money`"
+  @shortdoc @moduledoc
+  require Igniter.Code.Common
+  use Igniter.Mix.Task
+
+  def igniter(igniter, _argv) do
+    Igniter.compose_task(igniter, "ex_cldr.install", [], fn igniter, _argv ->
+      cldr_module_name = Igniter.Code.Module.module_name("Cldr")
+
+      igniter
+      |> Igniter.Code.Module.find_and_update_or_create_module(
+        cldr_module_name,
+        """
+        use Cldr,
+          locales: ["en"],
+          default_locale: "en"
+        """,
+        fn zipper -> {:ok, zipper} end
+      )
+      |> configure_cldr_config(cldr_module_name)
+    end)
+    |> configure_config()
+    |> maybe_add_to_ash_postgres()
+  end
+
+  defp configure_cldr_config(igniter, cldr_module_name) do
+    Igniter.Project.Config.configure_new(
+      igniter,
+      "config.exs",
+      :ex_cldr,
+      [:default_backend],
+      cldr_module_name
+    )
+  end
+
+  defp configure_config(igniter) do
+    Igniter.Project.Config.configure(
+      igniter,
+      "config.exs",
+      :ash,
+      [:known_types],
+      [AshMoney.Types.Money],
+      updater: fn zipper ->
+        Igniter.Code.List.append_new_to_list(zipper, AshMoney.Types.Money)
+      end
+    )
+  end
+
+  defp maybe_add_to_ash_postgres(igniter) do
+    repo_module_name = Igniter.Code.Module.module_name("Repo")
+
+    with {:ok, {igniter, _source, zipper}} <-
+           Igniter.Code.Module.find_module(igniter, repo_module_name),
+         {:ok, _zipper} <-
+           Igniter.Code.Module.move_to_module_using(zipper, AshPostgres.Repo) do
+      Igniter.compose_task(igniter, "ash_money.add_to_ash_postgres")
+    else
+      _ ->
+        igniter
+    end
+  end
+end

mix.exs

@@ -116,7 +116,8 @@ defmodule AshMoney.MixProject do
       {:sobelow, ">= 0.0.0", only: [:dev, :test], runtime: false},
       {:git_ops, "~> 2.5", only: [:dev, :test]},
       {:mix_test_watch, "~> 1.0", only: :dev, runtime: false},
-      {:mix_audit, ">= 0.0.0", only: [:dev, :test], runtime: false}
+      {:mix_audit, ">= 0.0.0", only: [:dev, :test], runtime: false},
+      {:igniter, "~> 0.2.5"}
     ]
   end