Code Extract: diet :"r" command

diet_runner.ex

defp command("r", args, state) do
  args = if String.starts_with?(args, ":") && String.contains?(args, " ") do
    String.replace(args, " ", ", ", global: false)
  else
    args
  end

  args = if String.contains?(args, ",") && !String.starts_with?(args, "{") do
    "{ #{args} }"
  else
    args
  end

  try do
    {arg_val, _} = Code.eval_string(args)
    { result, stepper } = Diet.Stepper.run(stepper(state), arg_val)
    IO.puts "\nResult: #{inspect result, pretty: true}"
    put_in(state.steppers[state.current], stepper)
    |> interact
  rescue
    e in [ CompileError, SyntaxError ] ->
      IO.puts "error: #{e.description}\n"
      interact(state)
  end
end