Add support for enabling and disabling the plugin from config

Author: aleksip

composer.json

@@ -27,5 +27,16 @@
         "php": ">=5.5.9",
         "pattern-lab/core": "^2.6.3",
         "pattern-lab/patternengine-twig": "^2.0.0"
+    },
+    "extra": {
+        "patternlab": {
+            "config": {
+                "plugins": {
+                    "dataTransform": {
+                        "enabled": true
+                    }
+                }
+            }
+        }
     }
 }

src/aleksip/DataTransformPlugin/PatternLabListener.php

@@ -3,6 +3,7 @@
 namespace aleksip\DataTransformPlugin;
 
 use aleksip\DataTransformPlugin\Twig\PatternDataNodeVisitor;
+use PatternLab\Config;
 use PatternLab\Listener;
 use PatternLab\PatternEngine\Twig\TwigUtil;
 
@@ -21,6 +22,11 @@ public function __construct()
 
     public function twigPatternLoaderCustomize()
     {
+        $enabled = Config::getOption('plugins.dataTransform.enabled');
+        if (!is_null($enabled) && !((bool)$enabled)) {
+            return;
+        }
+
         $this->dt ?: $this->dt = new DataTransformer();
         $this->nv ?: $this->nv = new PatternDataNodeVisitor($this->dt);