enhance(directives): Add a @postclass directive (Fixes #31) (#91)

docs/usage/wordpress.md

@@ -509,3 +509,13 @@ This is just a directive version of [`wp_footer`](https://developer.wordpress.or
 ## @wpbodyopen
 
 This is a directive version of [`wp_body_open`](https://developer.wordpress.org/reference/functions/wp_body_open/) except that it will work on WordPress versions below 5.2.
+
+## @postclass
+
+`@postclass` functions the same as `[post_class](https://developer.wordpress.org/reference/functions/post_class/)` accepting an optional class and post ID.
+
+```php
+@postclass
+@postclass('bg-white')
+@postclass('bg-white', $post->ID)
+```

src/Directives/WordPress.php

@@ -572,6 +572,16 @@
         return "<?php if (function_exists('wp_body_open')) { wp_body_open(); } else { do_action('wp_body_open'); } ?>";
     },
 
+    /*
+    |---------------------------------------------------------------------
+    | @postclass
+    |---------------------------------------------------------------------
+    */
+
+    'postclass' => function ($expression) {
+        return "<?php post_class({$expression}); ?>";
+    },
+
     /*
     |---------------------------------------------------------------------
     | @__

tests/Unit/WordPressTest.php

@@ -738,6 +738,32 @@
     });
 });
 
+describe('@postclass', function () {
+    it('compiles correctly', function () {
+        $directive = '@postclass';
+
+        $compiled = $this->compile($directive);
+
+        expect($compiled)->toBe('<?php post_class(); ?>');
+    });
+
+    it('compiles correctly with a custom class', function () {
+        $directive = "@postclass('custom-class')";
+
+        $compiled = $this->compile($directive);
+
+        expect($compiled)->toBe("<?php post_class('custom-class'); ?>");
+    });
+
+    it('compiles correctly with a custom class and post', function () {
+        $directive = "@postclass('custom-class', \$post->ID)";
+
+        $compiled = $this->compile($directive);
+
+        expect($compiled)->toBe("<?php post_class('custom-class', \$post->ID); ?>");
+    });
+});
+
 describe('@__', function () {
     it('compiles correctly', function () {
         $directive = "@__('Hello World', 'sage')";