feat(Features/TimberLoader): add template file name filter (#279)

* feat(Features/TimberLoader): add template file name filter

* refactor(Features/TimberLoader): use namespaced functions for filter calls instead of anonymous ones

* style(Features/TimberLoader): fix linting errors

Features/TimberLoader/functions.php

@@ -11,10 +11,24 @@
 define(__NAMESPACE__ . '\NS', __NAMESPACE__ . '\\');
 
 // Render Component with Timber (Twig)
-add_filter('Flynt/renderComponent', function ($output, $componentName, $componentData, $areaHtml) {
+add_filter('Flynt/renderComponent', NS . 'renderTwigIndex', 10, 4);
+
+// Convert ACF Images to Timber Images
+add_filter('acf/format_value/type=image', NS . 'formatImage', 100);
+
+// Convert ACF Gallery Images to Timber Images
+add_filter('acf/format_value/type=gallery', NS . 'formatGallery', 100);
+
+// Convert ACF Field of type post_object to a Timber\Post and add all ACF Fields of that Post
+add_filter('acf/format_value/type=post_object', NS . 'formatPostObject', 100);
+
+function renderTwigIndex($output, $componentName, $componentData, $areaHtml)
+{
     // get index file
     $componentManager = Flynt\ComponentManager::getInstance();
-    $filePath = $componentManager->getComponentFilePath($componentName, 'index.twig');
+    $templateFilename = apply_filters('Flynt/Features/TimberLoader/templateFilename', 'index.twig');
+    $templateFilename = apply_filters("Flynt/Features/TimberLoader/templateFilename?name=${componentName}", $templateFilename);
+    $filePath = $componentManager->getComponentFilePath($componentName, $templateFilename);
     $relativeFilePath = ltrim(str_replace(get_template_directory(), '', $filePath), '/');
 
     if (!is_file($filePath)) {
@@ -49,35 +63,35 @@
     remove_filter('get_twig', $addArea);
 
     return $output;
-}, 10, 4);
+}
 
-// Convert ACF Images to Timber Images
-add_filter('acf/format_value/type=image', function ($value) {
+function formatImage($value)
+{
     if (!empty($value)) {
         $value = new Image($value);
     }
     return $value;
-}, 100);
+}
 
-// Convert ACF Gallery Images to Timber Images
-add_filter('acf/format_value/type=gallery', function ($value) {
+function formatGallery($value)
+{
     if (!empty($value)) {
         $value = array_map(function ($image) {
             return new Image($image);
         }, $value);
     }
     return $value;
-}, 100);
+}
 
-// Convert ACF Field of type post_object to a Timber\Post and add all ACF Fields of that Post
-add_filter('acf/format_value/type=post_object', function ($value) {
+function formatPostObject($value)
+{
     if (is_array($value)) {
         $value = array_map(NS . 'convertToTimberPost', $value);
     } else {
         $value = convertToTimberPost($value);
     }
     return $value;
-}, 100);
+}
 
 function convertToTimberPost($value)
 {