Implement a better management interface for Settings (#809)

app/Traits/Helpers/AvailableLanguages.php

@@ -0,0 +1,56 @@
+<?php
+
+namespace Pterodactyl\Traits\Helpers;
+
+use Matriphe\ISO639\ISO639;
+use Illuminate\Filesystem\Filesystem;
+
+trait AvailableLanguages
+{
+    /**
+     * @var \Illuminate\Filesystem\Filesystem
+     */
+    private $filesystem;
+
+    /**
+     * @var \Matriphe\ISO639\ISO639
+     */
+    private $iso639;
+
+    /**
+     * Return all of the available languages on the Panel based on those
+     * that are present in the language folder.
+     *
+     * @param bool $localize
+     * @return array
+     */
+    public function getAvailableLanguages($localize = false): array
+    {
+        return collect($this->getFilesystemInstance()->directories(resource_path('lang')))->mapWithKeys(function ($path) use ($localize) {
+            $code = basename($path);
+            $value = $localize ? $this->getIsoInstance()->nativeByCode1($code) : $this->getIsoInstance()->languageByCode1($code);
+
+            return [$code => title_case($value)];
+        })->toArray();
+    }
+
+    /**
+     * Return an instance of the filesystem for getting a folder listing.
+     *
+     * @return \Illuminate\Filesystem\Filesystem
+     */
+    private function getFilesystemInstance(): Filesystem
+    {
+        return $this->filesystem = $this->filesystem ?: app()->make(Filesystem::class);
+    }
+
+    /**
+     * Return an instance of the ISO639 class for generating names.
+     *
+     * @return \Matriphe\ISO639\ISO639
+     */
+    private function getIsoInstance(): ISO639
+    {
+        return $this->iso639 = $this->iso639 ?: app()->make(ISO639::class);
+    }
+}