feat(directives): add constants directive

src/flextype/core/Entries/Directives/ConstantsDirective.php

@@ -0,0 +1,36 @@
+<?php
+
+declare(strict_types=1);
+
+ /**
+ * Flextype - Hybrid Content Management System with the freedom of a headless CMS 
+ * and with the full functionality of a traditional CMS!
+ * 
+ * Copyright (c) Sergey Romanenko (https://awilum.github.io)
+ *
+ * Licensed under The MIT License.
+ *
+ * For full copyright and license information, please see the LICENSE
+ * Redistributions of files must retain the above copyright notice.
+ */
+
+use Glowy\Arrays\Arrays as Collection;
+
+emitter()->addListener('onEntriesFetchSingleDirectives', static function (): void {
+
+    if (! registry()->get('flextype.settings.entries.directives.constants.enabled')) {
+        return;
+    }
+    
+    $field = entries()->registry()->get('methods.fetch.field');
+
+    if (is_string($field)) {
+        if (strings($field)->contains('@const:ROOT_DIR')) {
+            $field = strings($field)->replace('@const:ROOT_DIR', ROOT_DIR)->trim()->toString();
+        } elseif (strings($field)->contains('@const:PATH_PROJECT')) {
+            $field = strings($field)->replace('@const:PATH_PROJECT', PATH['project'])->trim()->toString();
+        }
+    }
+
+    entries()->registry()->set('methods.fetch.field', $field);
+});

tests/src/flextype/core/Entries/Directives/ConstantsDirectiveTest.php

@@ -0,0 +1,19 @@
+<?php
+
+use Flextype\Component\Filesystem\Filesystem;
+
+beforeEach(function() {
+    filesystem()->directory(PATH['project'] . '/entries')->create();
+});
+
+afterEach(function (): void {
+    filesystem()->directory(PATH['project'] . '/entries')->delete();
+});
+
+test('constants directive', function () {
+    entries()->create('const-root-dir', ['path' => '@const:ROOT_DIR']);
+    entries()->create('const-root-dir-2', ['path' => '@const:PATH_PROJECT']);
+
+    $this->assertEquals(ROOT_DIR, entries()->fetch('const-root-dir')['path']);
+    $this->assertEquals(PATH['project'], entries()->fetch('const-root-dir-2')['path']);
+});