Erlang terms formatter

deps/rabbitmq_cli/lib/rabbitmq/cli/ctl/commands/eval_command.ex

@@ -23,6 +23,8 @@ defmodule RabbitMQ.CLI.Ctl.Commands.EvalCommand do
   def switches(), do: []
   def aliases(), do: []
 
+  def formatter(), do: RabbitMQ.CLI.Formatters.ErlTerms
+
   def validate([], _) do
     {:validation_failure, :not_enough_args}
   end

deps/rabbitmq_cli/lib/rabbitmq/cli/formatters/erlang.ex

@@ -0,0 +1,33 @@
+## The contents of this file are subject to the Mozilla Public License
+## Version 1.1 (the "License"); you may not use this file except in
+## compliance with the License. You may obtain a copy of the License
+## at http://www.mozilla.org/MPL/
+##
+## Software distributed under the License is distributed on an "AS IS"
+## basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
+## the License for the specific language governing rights and
+## limitations under the License.
+##
+## The Original Code is RabbitMQ.
+##
+## The Initial Developer of the Original Code is GoPivotal, Inc.
+## Copyright (c) 2007-2016 Pivotal Software, Inc.  All rights reserved.
+
+defmodule RabbitMQ.CLI.Formatters.Erlang do
+  @behaviour RabbitMQ.CLI.Formatters.FormatterBehaviour
+
+  def format_output(output, _) do
+    :io_lib.format("~p", [output])
+    |> to_string
+  end
+
+  def format_stream(stream, options) do
+    elements = Stream.map(stream, fn
+                                    ({:error, msg}) ->
+                                      {:error, msg};
+                                    (element) ->
+                                      format_output(element, options)
+                                  end)
+    Stream.concat([["["], elements, ["]"]])
+  end
+end