add google analytics support

publishable/config/larecipe.php

@@ -51,7 +51,8 @@
     */
 
     'settings' => [
-        'auth' => false
+        'auth'  => false,
+        'ga_id' => ''
     ],
 
     /*

resources/views/default.blade.php

@@ -47,5 +47,18 @@
                 <script type="text/javascript" src="{{ asset($js) }}"></script>
             @endforeach
         @endif
+
+        {{-- Google Analytics --}}
+        @if(config('larecipe.settings.ga_id'))
+            <script async src="https://www.googletagmanager.com/gtag/js?id={{ config('larecipe.settings.ga_id') }}"></script>
+            <script>
+                window.dataLayer = window.dataLayer || [];
+                function gtag(){dataLayer.push(arguments);}
+                gtag('js', new Date());
+
+                gtag('config', "{{ config('larecipe.settings.ga_id') }}");
+            </script>
+        @endif
+        {{-- /Google Analytics --}}
     </body>
 </html>

tests/Feature/ConfigurationTest.php

@@ -49,4 +49,17 @@ public function back_to_top_button_is_visible_only_if_enabled()
         Config::set('larecipe.ui.back_to_top', true);
         $this->get('/docs/1.0')->assertSee('<larecipe-back-to-top></larecipe-back-to-top>');
     }
+
+    /** @test */
+    public function ga_script_is_visible_only_if_ga_id_is_set()
+    {
+        Config::set('larecipe.settings.ga_id', '');
+        $this->get('/docs/1.0')
+            ->assertDontSee('googletagmanager');
+
+        Config::set('larecipe.settings.ga_id', 'ga_code_id');
+        $this->get('/docs/1.0')
+            ->assertSee('googletagmanager')
+                ->assertSee('ga_code_id');
+    }
 }