Enhancement: Add configuration for friendsofphp/php-cs-fixer

.php_cs

@@ -0,0 +1,49 @@
+<?php
+
+declare(strict_types=1);
+
+/*
+ * This file is part of Tree.
+ *
+ * (c) 2013 Nicolò Martini
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+use Ergebnis\PhpCsFixer;
+use PhpCsFixer\Fixer;
+
+$header = <<<'TXT'
+This file is part of Tree.
+
+(c) 2013 Nicolò Martini
+
+For the full copyright and license information, please view the LICENSE
+file that was distributed with this source code.
+TXT;
+
+$config = PhpCsFixer\Config\Factory::fromRuleSet(new PhpCsFixer\Config\RuleSet\Php71(), [
+    'declare_strict_types' => false,
+    'final_class' => false,
+    'header_comment' => [
+        'comment_type' => Fixer\Comment\HeaderCommentFixer::HEADER_COMMENT,
+        'header' => \trim($header),
+        'location' => 'after_declare_strict',
+        'separate' => 'both',
+    ],
+    'void_return' => false,
+]);
+
+$config->getFinder()
+    ->ignoreDotFiles(false)
+    ->in(__DIR__)
+    ->exclude([
+        '.build/',
+        '.github/',
+    ])
+    ->name('.php_cs');
+
+$config->setCacheFile(__DIR__ . '/.build/php-cs-fixer/.php_cs.cache');
+
+return $config;