Add @includeOnce directive

src/DirectivesRepository.php

@@ -6,6 +6,11 @@
 
 class DirectivesRepository
 {
+    /**
+     * @var array
+     */
+    protected static $views_registry = [];
+
     /**
      * Register the directives.
      *
@@ -42,4 +47,23 @@ public static function stripQuotes($expression)
     {
         return str_replace(["'", '"'], '', $expression);
     }
+
+    /**
+     * Check if a view has not been included yet.
+     * @param string $view
+     *
+     * @return bool
+     */
+    public static function viewWasNotIncluded($view)
+    {
+        return ! in_array($view, static::$views_registry);
+    }
+
+    /**
+     * @param string $view
+     */
+    public static function addIncludedView($view)
+    {
+        static::$views_registry[] = $view;
+    }
 }

src/directives.php

@@ -64,6 +64,16 @@
         return '<?php endif; ?>';
     },
 
+    /*
+    |---------------------------------------------------------------------
+    | @includeOnce
+    |---------------------------------------------------------------------
+    */
+
+    'includeOnce' => function ($expression) {
+        return "<?php if (\Appstract\BladeDirectives\DirectivesRepository::viewWasNotIncluded({$expression})) {echo \$__env->make({$expression}, \Illuminate\Support\Arr::except(get_defined_vars(), array('__data', '__path')))->render();\Appstract\BladeDirectives\DirectivesRepository::addIncludedView({$expression});} ?>";
+    },
+
     /*
     |---------------------------------------------------------------------
     | @mix

tests/DirectivesTest.php

@@ -42,6 +42,13 @@ public function test_is_not_null()
         $this->assertBladeRenders('It is not null', $blade, ['variable' => 'not null']);
     }
 
+    public function test_include_once()
+    {
+        $blade = "@includeOnce('not-checkout')";
+        $this->assertBladeRenders('Do something only if this is not the checkout', $blade);
+        $this->assertBladeRenders('', $blade); // The second time the view shouldn't be included
+    }
+
     public function test_mix()
     {
         // See /tests/laravel/public/mix-manifest.json for CSS file name