Handle autocomplete limit

Author: mpchadwick

app/code/Magento/CatalogSearch/Model/Autocomplete/DataProvider.php

@@ -10,9 +10,16 @@
 use Magento\Search\Model\QueryFactory;
 use Magento\Search\Model\Autocomplete\DataProviderInterface;
 use Magento\Search\Model\Autocomplete\ItemFactory;
+use Magento\Framework\App\Config\ScopeConfigInterface as ScopeConfig;
+use Magento\Store\Model\ScopeInterface;
 
 class DataProvider implements DataProviderInterface
 {
+    /**
+     * Autocomplete limit
+     */
+    const CONFIG_AUTOCOMPLETE_LIMIT = 'catalog/search/autocomplete_limit';
+
     /**
      * Query factory
      *
@@ -27,16 +34,29 @@ class DataProvider implements DataProviderInterface
      */
     protected $itemFactory;
 
+    /**
+     * Limit
+     *
+     * @var int
+     */
+    protected $limit;
+
     /**
      * @param QueryFactory $queryFactory
      * @param ItemFactory $itemFactory
      */
     public function __construct(
         QueryFactory $queryFactory,
-        ItemFactory $itemFactory
+        ItemFactory $itemFactory,
+        ScopeConfig $scopeConfig
     ) {
         $this->queryFactory = $queryFactory;
         $this->itemFactory = $itemFactory;
+
+        $this->limit = (int) $scopeConfig->getValue(
+            self::CONFIG_AUTOCOMPLETE_LIMIT,
+            ScopeInterface::SCOPE_STORE
+        );
     }
 
     /**
@@ -58,7 +78,7 @@ public function getItems()
                 $result[] = $resultItem;
             }
         }
-        return $result;
+        return ($this->limit) ? array_splice($result, 0, $this->limit) : $result;
     }
 
     /**