From 62e3d75b7130a6f9837a4a75a9dbece987fcdb5a Mon Sep 17 00:00:00 2001
From: vnmedeiros <vnicius.nm.ba@gmail.com>
Date: Wed, 22 Jul 2020 10:50:41 -0300
Subject: [PATCH] add test if navigation is at the end or start of the list

---
 .../single-items-navigation.php               | 27 ++++++++++---------
 1 file changed, 15 insertions(+), 12 deletions(-)

diff --git a/src/template-parts/single-items-navigation.php b/src/template-parts/single-items-navigation.php
index 31a127c..156b6b1 100644
--- a/src/template-parts/single-items-navigation.php
+++ b/src/template-parts/single-items-navigation.php
@@ -1,15 +1,18 @@
 <?php 
-
     if (function_exists('tainacan_get_adjacent_items')) {
         $adjacent_items = tainacan_get_adjacent_items();
 
-        if ($adjacent_items['next']) {
+        if (isset($adjacent_items['next'])) {
             $next_link_url = $adjacent_items['next']['url'];
             $next_title = $adjacent_items['next']['title'];
+        } else {
+            $next_link_url = false;
         }
-        if ($adjacent_items['previous']) {
+        if (isset($adjacent_items['previous'])) {
             $previous_link_url = $adjacent_items['previous']['url'];
             $previous_title = $adjacent_items['previous']['title'];
+        } else {
+            $previous_link_url = false;
         }
     } else {
         //Get the links to the Previous and Next Post
@@ -27,8 +30,8 @@
     switch (get_theme_mod('tainacan_single_item_navigation_options', 'none')) {
 
         case 'link':
-            $previous = '<a rel="prev" href="' . $previous_link_url . '"><i class="tainacan-icon tainacan-icon-arrowleft tainacan-icon-30px"></i>&nbsp; ' . $previous_title . '</a>';
-            $next = '<a rel="next" href="' . $next_link_url . '">' . $next_title . ' &nbsp;<i class="tainacan-icon tainacan-icon-arrowright tainacan-icon-30px"></i></a>';
+            $previous = $previous_link_url === false ? '' : '<a rel="prev" href="' . $previous_link_url . '"><i class="tainacan-icon tainacan-icon-arrowleft tainacan-icon-30px"></i>&nbsp; ' . $previous_title . '</a>';
+            $next = $next_link_url === false ? '' :'<a rel="next" href="' . $next_link_url . '">' . $next_title . ' &nbsp;<i class="tainacan-icon tainacan-icon-arrowright tainacan-icon-30px"></i></a>';
         break;
 
         case 'thumbnail_small':
@@ -46,12 +49,12 @@
             }
 
             // Creates the links
-            $previous = 
+            $previous = $previous_link_url === false ? '' :
                 '<a class="has-small-thumbnail" rel="prev" href="' . $previous_link_url . '">' . 
                     '<i class="tainacan-icon tainacan-icon-arrowleft tainacan-icon-30px"></i>&nbsp;' . 
                     $previous_title . '<img src="' . $previous_thumb . '" alt="">' .
                 '</a>';
-            $next = 
+            $next = $next_link_url === false ? '' :
                 '<a class="has-small-thumbnail" rel="next" href="' . $next_link_url . '">' . 
                     '<img src="' . $next_thumb . '" alt="">' . $next_title . 
                     '&nbsp;<i class="tainacan-icon tainacan-icon-arrowright tainacan-icon-30px"></i>' .
@@ -74,12 +77,12 @@
             }
 
             // Creates the links
-            $previous = 
+            $previous = $previous_link_url === false ? '' :
                 '<a class="has-large-thumbnail" rel="prev" href="' . $previous_link_url . '">' .
                     '<i class="tainacan-icon tainacan-icon-arrowleft tainacan-icon-36px"></i>&nbsp;' .
                     '<div><img src="' . $previous_thumb . '" alt="">' . $previous_title . 
                 '</div></a>';
-            $next = 
+            $next = $next_link_url === false ? '' :
                 '<a class="has-large-thumbnail" rel="next" href="' . $next_link_url . '">' . 
                     '<div><img src="' . $next_thumb . '" alt="">' . $next_title . 
                     '</div>&nbsp;<i class="tainacan-icon tainacan-icon-arrowright tainacan-icon-36px"></i>' .
@@ -89,17 +92,17 @@
         case 'none':
         default:
         return '';
-    } 
+    }
 ?>
 
 <div class="tainacan-single-post">
     <h2 class="title-content-items"><?php echo __('Also in this collection', 'tainacan-interface') ?></h2>
     <div id="item-single-navigation" class="d-flex justify-content-between margin-two-column">
         <div class="pagination">
-            <?php previous_post_link($previous); ?>
+            <?php if($previous_link_url !== false) previous_post_link($previous); ?>
         </div>
         <div class="pagination">
-            <?php next_post_link($next); ?>
+            <?php if($next_link_url !== false) next_post_link($next); ?>
         </div>
     </div>
 </div>
\ No newline at end of file