filter recursive function

test/index.js

@@ -100,3 +100,50 @@ test ('check isnil with nan', (t) => {
 test ('check isnil with int', (t) => {
   t.is (util.is_nil (parseInt ('42')), false);
 });
+
+test ('recursive filter', (t) => {
+  const raw = [
+    { name: 'include_foo' },
+    {
+      name:     'include_bar',
+      children: [
+        { name: 'foo' },
+        { name: 'bar' }
+      ]
+    },
+    {
+      name:     'baz',
+      children: [
+        { name: 'include_foo' },
+        { name: 'bar' }
+      ]
+    },
+    {
+      name:     'barbaz',
+      children: [
+        { name: 'foo' },
+        { name: 'bar' }
+      ]
+    }
+  ];
+  const filtered = [
+    { name: 'include_foo' },
+    {
+      name:     'include_bar',
+      children: [
+        { name: 'foo' },
+        { name: 'bar' }
+      ]
+    },
+    {
+      name:     'baz',
+      children: [ { name: 'include_foo' } ]
+    }
+  ];
+  const filter = {
+    field:  'name',
+    filter: /^include_.*/ui
+  };
+  const result = util.recursive_filter (raw, [ filter ]);
+  t.deepEqual (filtered, result);
+});