Add language support.

Author: dadish

src/Field/Language.php

@@ -0,0 +1,32 @@
+<?php
+
+namespace ProcessWire\GraphQL\Field;
+
+use GraphQL\Type\Definition\Type;
+use ProcessWire\GraphQL\Utils;
+use ProcessWire\Language as PWLanguage;
+
+class Language {
+  public static function field()
+  {
+    return [
+      'type' => Type::string(),
+      'name' => 'language',
+      'description' => "Set the language of the content you are requesting. __Note__: Place this field on top of other fields whose language you want to set.",
+      'args' => [
+        'name' => Type::nonNull(Type::string())
+      ],
+      'resolve' => function ($pages, array $args)
+      {
+        $languageName = Utils::sanitizer()->pageName($args['name']);
+        $language = Utils::languages()->get($languageName);
+        if ($language instanceof PWLanguage) {
+          Utils::user()->language = $language;
+          return $language->name;
+        } else {
+          return 'Unknown language!';
+        }   
+      }
+    ];
+  }
+}

src/Schema.php

@@ -3,6 +3,7 @@
 use GraphQL\Type\Definition\ObjectType;
 use GraphQL\Type\Schema as GraphQLSchema;
 
+use ProcessWire\Languages;
 use ProcessWire\GraphQL\Utils;
 use ProcessWire\GraphQL\Cache;
 use ProcessWire\GraphQL\Permissions;
@@ -14,6 +15,7 @@
 use ProcessWire\GraphQL\Field\Mutation\CreatePage;
 use ProcessWire\GraphQL\Field\Mutation\TrashPage;
 use ProcessWire\GraphQL\Field\Mutation\UpdatePage;
+use ProcessWire\GraphQL\Field\Language;
 
 class Schema
 {
@@ -81,6 +83,12 @@ public static function buildQuery()
       $queryFields[] = DbQuery::field();
     }
 
+    // Language
+    $languages = Utils::languages();
+    if ($languages && $languages instanceof Languages) {
+      $queryFields[] = Language::field();
+    }
+
     // let the user modify the query operation
     $queryFields = Utils::module()->getQueryFields($queryFields);