igniter/lib/mix/task.ex

defmodule Igniter.Mix.Task do
  @moduledoc "A behaviour for implementing a Mix task that is enriched to be composable with other Igniter tasks."
  @callback supports_umbrella?() :: boolean()
  @callback igniter(igniter :: Igniter.t(), argv :: list(String.t())) :: Igniter.t()

  defmacro __using__(_opts) do
    quote do
      use Mix.Task
      @behaviour Igniter.Mix.Task

      def run(argv) do
        if !supports_umbrella?() && Mix.Project.umbrella?() do
          raise """
          Cannot run #{inspect(__MODULE__)} in an umbrella project.
          """
        end

        Application.ensure_all_started([:rewrite])

        Igniter.new()
        |> igniter(argv)
        |> Igniter.do_or_dry_run(argv)
      end

      def supports_umbrella?, do: false

      defoverridable supports_umbrella?: 0
    end
  end
end