Add Twig Extension to get some datatable config as json string.

Author: pokurek

Resources/views/datatable/datatable_js.json.twig

@@ -0,0 +1,13 @@
+{% spaceless %}
+{
+    "selector": "#sg-datatables-{{ sg_datatables_view.uniqueName }}", 
+    {% include '@SgDatatables/datatable/language.html.twig' %},
+    {% include '@SgDatatables/datatable/ajax.html.twig' %}
+    {% include '@SgDatatables/datatable/options.html.twig' %}
+    {% include '@SgDatatables/datatable/features.html.twig' %}
+    {% include '@SgDatatables/datatable/callbacks.html.twig' %}
+    {% include '@SgDatatables/datatable/extensions.html.twig' %}
+    {% include '@SgDatatables/datatable/columns.html.twig' %},
+    {% include '@SgDatatables/datatable/initial_search.html.twig' %}
+}
+{% endspaceless %}

Twig/DatatableTwigExtension.php

@@ -70,6 +70,11 @@ public function getFunctions()
                 [$this, 'datatablesRenderJs'],
                 ['is_safe' => ['html'], 'needs_environment' => true]
             ),
+            new TwigFunction(
+                'sg_datatables_render_json',
+                [$this, 'datatablesRenderJson'],
+                ['is_safe' => ['html'], 'needs_environment' => true]
+            ),
             new TwigFunction(
                 'sg_datatables_render_filter',
                 [$this, 'datatablesRenderFilter'],
@@ -142,6 +147,27 @@ public function datatablesRenderJs(Environment $twig, DatatableInterface $datata
         );
     }
 
+    /**
+     * Renders the json config options.
+     *
+     * @return string
+     */
+    public function datatablesRenderJson(Environment $twig, DatatableInterface $datatable)
+    {
+        $json = $twig->render(
+            '@SgDatatables/datatable/datatable_js.json.twig',
+            [
+                'sg_datatables_view' => $datatable,
+            ]
+        );
+        
+        // Try to make valid json string, remove comma before [ { etc.
+        $regex = '/\,(?!\s*?[\{\[\"\'\w])/';
+        $json = preg_replace($regex, '', $json);
+
+        return $json;
+    }
+
     /**
      * Renders a Filter template.
      *