From 4520d5f3c12771cb6bbd800c2bab9b2480f3ae91 Mon Sep 17 00:00:00 2001
From: Badlop <badlop@process-one.net>
Date: Tue, 8 Jun 2021 16:42:38 +0200
Subject: [PATCH] Support for simple limiting the number of items in PubSub
 with RSM (#3618)

This fixes crash in Example 1 from "2.1 Limiting the Number of Items":
https://xmpp.org/extensions/xep-0059.html#limit
---
 src/node_flat.erl | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/node_flat.erl b/src/node_flat.erl
index c51cebe87..1fd860ec2 100644
--- a/src/node_flat.erl
+++ b/src/node_flat.erl
@@ -750,6 +750,8 @@ get_items(Nidx, _From, #rsm_set{max = Max, index = IncIndex,
                     end,
             {Offset, ItemsPage} =
                 case {IncIndex, Before, After} of
+                    {undefined, undefined, undefined} ->
+                        {0, lists:sublist(RItems, Limit)};
                     {I, undefined, undefined} ->
                         SubList = lists:nthtail(I, RItems),
                         {I, lists:sublist(SubList, Limit)};