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Robust user authentication solution

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pow lib mix tasks ecto pow.ecto.gen.schema.ex
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lib/mix/tasks/ecto/pow.ecto.gen.schema.ex 

defmodule Mix.Tasks.Pow.Ecto.Gen.Schema do

  @shortdoc "Generates user schema and migration file"



  @moduledoc """

  Generates a user schema and migration file.



      mix pow.ecto.gen.schema -r MyApp.Repo

  """

  use Mix.Task



  alias Mix.{Generator, Pow.Utils}

  alias Mix.Tasks.Pow.Ecto.Gen

  alias Pow.Ecto.Schema.Module



  @switches [migrations: :boolean, context_app: :string]

  @default_opts [migrations: true]



  @doc false

  def run(args) do

    Utils.no_umbrella!("pow.ecto.gen.schema")



    args

    |> Utils.parse_options(@switches, @default_opts)

    |> maybe_run_gen_migration(args)

    |> create_schema_file()

  end



  defp maybe_run_gen_migration(%{migrations: true} = config, args) do

    Gen.Migration.run(args)



    config

  end

  defp maybe_run_gen_migration(config, _args), do: config



  defp create_schema_file(config) do

    context_app  = Map.get(config, :context_app, Utils.context_app())

    context_base = Utils.context_base(context_app)



    base_name = "user.ex"

    content   = Module.gen(context_base, module: "Users.User")



    context_app

    |> Utils.context_lib_path("users")

    |> maybe_create_directory()

    |> Path.join(base_name)

    |> ensure_unique()

    |> Generator.create_file(content)

  end



  defp maybe_create_directory(path) do

    Generator.create_directory(path)



    path

  end



  defp ensure_unique(path) do

    path

    |> File.exists?()

    |> case do

      false -> path

      _     -> Mix.raise("schema file can't be created, there is already a schema file in #{path}.")

    end

  end

end