add flags to permissions groups

Flags can be added to permissions group to store some metadata.

An interface `PermissionsGroupFlagProvider` allow to add some flag to the form which create/
edit permissions groups.

Form/PermissionsGroupType.php

@@ -5,9 +5,20 @@ namespace Chill\MainBundle\Form;
 use Symfony\Component\Form\AbstractType;
 use Symfony\Component\Form\FormBuilderInterface;
 use Symfony\Component\OptionsResolver\OptionsResolver;
+use Symfony\Component\Form\Extension\Core\Type\TextType;
+use Chill\MainBundle\Form\Utils\PermissionsGroupFlagProvider;
+use Symfony\Component\Form\Extension\Core\Type\ChoiceType;
 
 class PermissionsGroupType extends AbstractType
 {
+    /**
+     *
+     * @var PermissionsGroupFlagProvider[]
+     */
+    protected $flagProviders = [];
+    
+    const FLAG_SCOPE = 'permissions_group';
+    
     /**
      * @param FormBuilderInterface $builder
      * @param array $options
@@ -15,8 +26,40 @@ class PermissionsGroupType extends AbstractType
     public function buildForm(FormBuilderInterface $builder, array $options)
     {
         $builder
-            ->add('name')
+            ->add('name', TextType::class)
         ;
+        
+        $flags = $this->getFlags();
+        
+        if (count($flags) > 0) {
+            $builder
+                ->add('flags', ChoiceType::class, [
+                    'choices' => \array_combine($flags, $flags),
+                    'multiple' => true,
+                    'expanded' => true,
+                    'required' => false
+                ]);
+        }
+    }
+    
+    /**
+     * 
+     * @return array
+     */
+    protected function getFlags(): array
+    {
+        $flags = [];
+        
+        foreach ($this->flagProviders as $flagProvider) {
+            $flags = \array_merge($flags, $flagProvider->getPermissionsGroupFlags());
+        }
+        
+        return $flags;
+    }
+    
+    public function addFlagProvider(PermissionsGroupFlagProvider $provider)
+    {
+        $this->flagProviders[] = $provider;
     }
 
     /**

Form/Utils/PermissionsGroupFlagProvider.php

@@ -0,0 +1,18 @@
+<?php
+
+
+namespace Chill\MainBundle\Form\Utils;
+
+/**
+ *
+ * 
+ */
+interface PermissionsGroupFlagProvider
+{
+    /**
+     * Return an array of flags
+     * 
+     * @return string[] an array. Keys are ignored.
+     */
+    public function getPermissionsGroupFlags(): array;
+}