pandoc

defmodule Mix.Tasks.Pandoc do
  use Mix.Task

  @impl true
  def run(args) do
    switches = [runtime_config: :boolean]
    {opts, remaining_args} = OptionParser.parse_head!(args, switches: switches)

    if opts[:runtime_config] do
      Mix.Task.run("app.config")
    else
      Mix.Task.run("loadpaths")
      Application.ensure_all_started(:pandoc)
    end

    Mix.Task.reenable("pandoc")
    install_and_run(remaining_args)
  end

  defp install_and_run([profile | args] = _all) do
    IO.puts("mix task args #{inspect(args)}")

    "documents"
    |> File.ls!()
    |> Enum.each(fn path ->
      all = [profile, path]

      case Pandoc.run(String.to_atom(profile), [path]) do
        0 -> :ok
        status -> Mix.raise("`mix pandoc #{Enum.join(all, " ")}` exited with #{status}")
      end
    end)
  end

  defp install_and_run([]) do
    Mix.raise("`mix pandoc` expects the profile as argument")
  end
end