Clicking on icon next to note title will filter list to notes that has been assigned with clicked icon.

app/Http/Controllers/Main.php

@@ -136,6 +136,33 @@ class Main extends Controller
         ]);
     }
 
+    /**
+     * get:/
+     * @param Request $request
+     * @param null $filter
+     * @return \Illuminate\Contracts\View\Factory|\Illuminate\View\View
+     */
+    public function filterView(Request $request, $filter = 'empty')
+    {
+        $notes = DB::select('SELECT *, CASE WHEN icon IS NULL
+       THEN \'empty\'
+       ELSE icon
+       END AS new_icon FROM note WHERE type = "note" AND new_icon = :icon ORDER BY updated_at DESC', ['icon' => $filter]);
+        $templates = DB::select('SELECT *, CASE WHEN icon IS NULL
+       THEN \'empty\'
+       ELSE icon
+        END AS new_icon FROM note WHERE type = "template" AND new_icon = :icon ORDER BY updated_at DESC', ['icon' => $filter]);
+        return view('list', [
+            'filter' => $filter,
+            'notes' => $notes,
+            'templates' => $templates,
+            'title' => $request->old('title'),
+            'text' => $request->old('text'),
+            'icon_selected' => $request->old('icon'),
+            'icons' => $this->paper->getIcons()
+        ]);
+    }
+
     /**
      * post::/print/{id}
      * @param Request $request