Added possibility to filter by frontpage (#20)

Author: iPurpl3x

extend.php

@@ -15,6 +15,7 @@
 use Flarum\Api\Serializer\DiscussionSerializer;
 use Flarum\Discussion\Discussion;
 use Flarum\Discussion\Event\Saving;
+use Flarum\Discussion\Filter\DiscussionFilterer;
 use Flarum\Discussion\Search\DiscussionSearcher;
 use Flarum\Extend;
 use FoF\FrontPage\Gambits\FrontGambit;
@@ -34,6 +35,9 @@
     (new Extend\SimpleFlarumSearch(DiscussionSearcher::class))
         ->addGambit(FrontGambit::class),
 
+    (new Extend\Filter(DiscussionFilterer::class))
+        ->addFilter(FrontGambit::class),
+
     (new Extend\Model(Discussion::class))
         ->dateAttribute('frontdate'),
 

src/Gambits/FrontGambit.php

@@ -11,28 +11,56 @@
 
 namespace FoF\FrontPage\Gambits;
 
+use Flarum\Filter\FilterInterface;
+use Flarum\Filter\FilterState;
 use Flarum\Query\AbstractQueryState;
 use Flarum\Search\AbstractRegexGambit;
+use Illuminate\Database\Query\Builder;
 
-class FrontGambit extends AbstractRegexGambit
+class FrontGambit extends AbstractRegexGambit implements FilterInterface
 {
     /**
-     * @return [type]
+     * @return string
      */
     public function getGambitPattern()
     {
         return 'is:frontpage';
     }
 
+    /**
+     * @return string
+     */
+    public function getFilterKey(): string
+    {
+        return 'frontpage';
+    }
+
     /**
      * @param AbstractQueryState $search
      * @param array              $matches
      * @param mixed              $negate
      *
-     * @return [type]
+     * @return void
      */
     public function conditions(AbstractQueryState $search, array $matches, $negate)
     {
-        $search->getQuery()->where('frontpage', !$negate);
+        $this->constrain($search->getQuery(), $negate);
+    }
+
+    /**
+     * @param FilterState $search
+     * @param string      $filterValue
+     * @param mixed       $negate
+     *
+     * @return void
+     */
+    public function filter(FilterState $filterState, string $filterValue, bool $negate)
+    {
+        $this->constrain($filterState->getQuery(), $negate);
+    }
+
+    protected function constrain(Builder $query, bool $negate)
+    {
+        $query->where('frontpage', !$negate);
     }
 }