search settings in store

src/shared/default-settings.js

@@ -36,6 +36,17 @@ export default {
     "]]": { "type": "navigate.link.next" },
     "gu": { "type": "navigate.parent" },
     "gU": { "type": "navigate.root" }
+  },
+  "search": {
+    "default": "google",
+    "engines": {
+      "google": "https://google.com/search?q={}",
+      "yahoo": "https://search.yahoo.com/search?p={}",
+      "bing": "https://www.bing.com/search?q={}",
+      "duckduckgo": "https://duckduckgo.com/?q={}",
+      "twitter": "https://twitter.com/search?q={}",
+      "wikipedia": "https://en.wikipedia.org/w/index.php?search={}"
+    }
   }
 }`
 };

src/shared/validators/setting.js

@@ -1,6 +1,6 @@
 import operations from '../../operations';
 
-const VALID_TOP_KEYS = ['keymaps'];
+const VALID_TOP_KEYS = ['keymaps', 'search'];
 const VALID_OPERATION_VALUES = Object.keys(operations).map((key) => {
   return operations[key];
 });