Prevent duplicate/overwritten keys

src/Editor/Editor.php

@@ -2,6 +2,7 @@
 
 namespace NoccyLabs\JsonEdit\Editor;
 
+use Exception;
 use NoccyLabs\JsonEdit\List\TreeList;
 use NoccyLabs\JsonEdit\Settings;
 use NoccyLabs\JsonEdit\Terminal\Terminal;
@@ -590,10 +591,14 @@ class Editor
         if ($parent->node instanceof ObjectNode) {
             $newVal = $this->ask("\e[0;33mnew key:\e[0m ", $entry->key);
             if (!empty($newVal)) {
-                $parent->node->rename($entry->key, $newVal);
-                $entry->key = $newVal;
-                $this->list->parseTree();
-                $this->redrawEditor();
+                try {
+                    $parent->node->rename($entry->key, $newVal);
+                    $entry->key = $newVal;
+                    $this->redrawEditor();
+                } catch (Exception $e) {
+                    $this->redrawEditor();
+                    $this->showMessage("\e[97;41m".$e->getMessage());
+                }
             }
         } else {
             // $this->term->setCursor(1, $h);
@@ -679,6 +684,10 @@ class Editor
                 $this->redrawInfoBar();
                 return;
             }
+            if ($node->hasKey($key)) {
+                $this->showMessage("\e[97;41mThe key {$key} already exists");
+                return;
+            }
         }
 
         if ($value === null)