Add duplicate (^D), basic search, bugfixes

* Use ^D to duplicate array items
* Use / to search, matching keys will be highlighted
* Don't attempt to load non-existing files when passed on command line

src/Tree/Tree.php

@@ -43,5 +43,42 @@ class Tree
         }
     }
 
+    public function search(string $search): array
+    {
+        return $this->searchNode(null, $this->root, $search);
+    }
+
+    /**
+     * 
+     * 
+     * @return array<Node>
+     */
+    private function searchNode(?string $key, Node $node, string $search): array
+    {
+        $results = [];
+        
+        if ($node instanceof ArrayNode) {
+            if ($key && str_contains($key, $search)) {
+                $results[] = $node;
+            }
+            foreach ($node->items as $index=>$item) {
+                $results = [ ...$results, ...$this->searchNode($index, $item, $search) ];
+            }            
+        } elseif ($node instanceof ObjectNode) {
+            if ($key && str_contains($key, $search)) {
+                $results[] = $node;
+            }
+            foreach ($node->properties as $key=>$item) {
+                $results = [ ...$results, ...$this->searchNode($key, $item, $search) ];
+            }            
+        } elseif ($node instanceof ValueNode) {
+            if (str_contains($node->value, $search) || ($key && str_contains($key, $search))) {
+                $results[] = $node;
+            }
+        }
+
+        return $results;
+    }
+
 }