Ensure SEO blueprint section/fields are removed when SEO is disabled. C…

…loses #108.

src/Blueprint.php

@@ -38,6 +38,18 @@ public static function on($event)
         return new static($event);
     }
 
+    /**
+     * Ensure SEO section and fields are added to (or removed from) blueprint.
+     *
+     * @param bool $isEnabled
+     */
+    public function ensureSeoFields($isEnabled = true)
+    {
+        $isEnabled
+            ? $this->addSeoFields()
+            : $this->removeSeoFields();
+    }
+
     /**
      * Add SEO section and fields to blueprint.
      */
@@ -54,6 +66,14 @@ public function addSeoFields()
         static::$addingField = false;
     }
 
+    /**
+     * Remove SEO section and fields from blueprint.
+     */
+    public function removeSeoFields()
+    {
+        $this->blueprint->removeSection('SEO');
+    }
+
     /**
      * Get event data.
      *

src/Subscriber.php

@@ -17,8 +17,8 @@ class Subscriber
      * @var array
      */
     protected $events = [
-        Events\EntryBlueprintFound::class => 'addSeoFields',
-        Events\TermBlueprintFound::class => 'addSeoFields',
+        Events\EntryBlueprintFound::class => 'ensureSeoFields',
+        Events\TermBlueprintFound::class => 'ensureSeoFields',
         Events\CollectionSaved::class => 'clearSitemapCache',
         Events\EntrySaved::class => 'clearSitemapCache',
         Events\TaxonomySaved::class => 'clearSitemapCache',
@@ -38,15 +38,15 @@ public function subscribe($events)
     }
 
     /**
-     * Add SEO section and fields to entry blueprint.
+     * Ensure section blueprint has (or doesn't have) SEO fields.
      *
      * @param mixed $event
      */
-    public function addSeoFields($event)
+    public function ensureSeoFields($event)
     {
-        if ($this->seoIsEnabledForSection($event)) {
-            Blueprint::on($event)->addSeoFields();
-        }
+        Blueprint::on($event)->ensureSeoFields(
+            $this->seoIsEnabledForSection($event)
+        );
     }
 
     /**