CLI commands: provide more information to the new help command

Author: michaelklishin

include/rabbit_stomp.hrl

@@ -47,3 +47,5 @@
          ssl_key_exchange,
          ssl_cipher,
          ssl_hash]).
+
+-define(STOMP_GUIDE_URL, <<"https://rabbitmq.com/stomp.html">>).

src/Elixir.RabbitMQ.CLI.Ctl.Commands.ListStompConnectionsCommand.erl

@@ -15,12 +15,23 @@
 
 -module('Elixir.RabbitMQ.CLI.Ctl.Commands.ListStompConnectionsCommand').
 
--behaviour('Elixir.RabbitMQ.CLI.CommandBehaviour').
 -include("rabbit_stomp.hrl").
 
--export([formatter/0, scopes/0, switches/0, aliases/0,
-         usage/0, usage_additional/0, banner/2,
-         validate/2, merge_defaults/2, run/2, output/2, description/0,
+-behaviour('Elixir.RabbitMQ.CLI.CommandBehaviour').
+
+-export([formatter/0,
+         scopes/0,
+         switches/0,
+         aliases/0,
+         usage/0,
+         usage_additional/0,
+         usage_doc_guides/0,
+         banner/2,
+         validate/2,
+         merge_defaults/2,
+         run/2,
+         output/2,
+         description/0,
          help_section/0]).
 
 formatter() -> 'Elixir.RabbitMQ.CLI.Formatters.Table'.
@@ -48,16 +59,21 @@ merge_defaults(Args, Opts) ->
     {Args, maps:merge(#{verbose => false}, Opts)}.
 
 usage() ->
-    <<"list_stomp_connections [<stomp_connectioninfoitem> ...]">>.
+    <<"list_stomp_connections [<column> ...]">>.
 
 usage_additional() ->
-      <<"<stomp_connectioninfoitem> must be a member of the list [",
-        ('Elixir.Enum':join(?INFO_ITEMS, <<", ">>))/binary,
-        "].">>.
+    Prefix = <<" must be one of ">>,
+    InfoItems = 'Elixir.Enum':join(lists:usort(?INFO_ITEMS), <<", ">>),
+    [
+      {<<"<column>">>, <<Prefix/binary, InfoItems/binary>>}
+    ].
+
+usage_doc_guides() ->
+    [?STOMP_GUIDE_URL].
 
 run(Args, #{node := NodeName,
-                    timeout := Timeout,
-                    verbose := Verbose}) ->
+            timeout := Timeout,
+            verbose := Verbose}) ->
     InfoKeys = case Verbose of
         true  -> ?INFO_ITEMS;
         false -> 'Elixir.RabbitMQ.CLI.Ctl.InfoKeys':prepare_info_keys(Args)