ENH Update code to reflect changes in template layer

code/Control/UserDefinedFormController.php

@@ -31,8 +31,9 @@ use SilverStripe\UserForms\Model\UserDefinedForm;
 use SilverStripe\Versioned\Versioned;
 use SilverStripe\Model\ArrayData;
 use SilverStripe\View\Requirements;
-use SilverStripe\View\SSViewer;
 use SilverStripe\Model\ModelData;
+use SilverStripe\View\TemplateEngine;
+use SilverStripe\View\ViewLayerData;
 use Swift_RfcComplianceException;
 
 /**
@@ -421,7 +422,8 @@ JS
                 // Include any parsed merge field references from the CMS editor - this is already escaped
                 // This string substitution works for both HTML and plain text emails.
                 // $recipient->getEmailBodyContent() will retrieve the relevant version of the email
-                $emailData['Body'] = SSViewer::execute_string($recipient->getEmailBodyContent(), $mergeFields);
+                $engine = Injector::inst()->create(TemplateEngine::class);
+                $emailData['Body'] = $engine->renderString($recipient->getEmailBodyContent(), ViewLayerData::create($mergeFields));
                 // only include visible fields if recipient visibility flag is set
                 if ((bool) $recipient->HideInvisibleFields) {
                     $emailData['Fields'] = $visibleSubmittedFields;
@@ -487,10 +489,10 @@ JS
                     if ($submittedFormField && trim($submittedFormField->Value ?? '')) {
                         $email->setSubject($submittedFormField->Value);
                     } else {
-                        $email->setSubject(SSViewer::execute_string($recipient->EmailSubject, $mergeFields));
+                        $email->setSubject($engine->renderString($recipient->EmailSubject, ViewLayerData::create($mergeFields)));
                     }
                 } else {
-                    $email->setSubject(SSViewer::execute_string($recipient->EmailSubject, $mergeFields));
+                    $email->setSubject($engine->renderString($recipient->EmailSubject, ViewLayerData::create($mergeFields)));
                 }
 
                 $this->extend('updateEmail', $email, $recipient, $emailData);
@@ -660,7 +662,7 @@ EOS;
                 // Hide the step jump button if the FormStep has is initially hidden.
                 // This is particularly important beacause the next/prev page buttons logic is controlled by
                 // the visibility of the FormStep buttons
-                // The HTML for the FormStep buttons is defined in UserFormProgress.ss
+                // The HTML for the FormStep buttons is defined in the UserFormProgress template
                 $id = str_replace('#', '', $target ?? '');
                 $result .= <<<EOS
     $('.step-button-wrapper[data-for="{$id}"]').addClass('hide');

code/FormField/UserFormsCheckboxSetField.php

@@ -12,10 +12,10 @@ class UserFormsCheckboxSetField extends CheckboxSetField
 {
 
     /**
-     * If your project uses a custom UserFormsCheckboxSetField.ss, ensure that it includes
+     * If your project uses a custom UserFormsCheckboxSetField template, ensure that it includes
      * `$Top.getValidationAttributesHTML().RAW` so that custom validation messages work
      * For further details see
-     * templates/SilverStripe/UserForms/FormField/UserFormsCheckboxSetField.ss
+     * templates/SilverStripe/UserForms/FormField/UserFormsCheckboxSetField template
      *
      * Use on a template with .RAW - single and double quoted strings will be safely escaped
      *

code/FormField/UserFormsOptionSetField.php

@@ -12,10 +12,10 @@ class UserFormsOptionSetField extends OptionsetField
 {
 
     /**
-     * If your project uses a custom UserFormsCheckboxSetField.ss, ensure that it includes
+     * If your project uses a custom UserFormsCheckboxSetField template, ensure that it includes
      * `$Top.getValidationAttributesHTML().RAW` so that custom validation messages work
      * For further details see
-     * templates/SilverStripe/UserForms/FormField/UserFormsCheckboxSetField.ss
+     * templates/SilverStripe/UserForms/FormField/UserFormsCheckboxSetField template
      *
      * Use on a template with .RAW - single and double quoted strings will be safely escaped
      *

code/Model/Recipient/EmailRecipient.php

@@ -137,6 +137,12 @@ class EmailRecipient extends DataObject
      */
     private static $allow_unbound_recipient_fields = false;
 
+    /**
+     * The regex used to find template files for rendering emails.
+     * By default this finds ss template files.
+     */
+    private static string $email_template_regex = '/^.*\.ss$/';
+
     public function requireDefaultRecords()
     {
         parent::requireDefaultRecords();
@@ -562,7 +568,7 @@ class EmailRecipient extends DataObject
         $templates = [];
 
         $finder = new FileFinder();
-        $finder->setOption('name_regex', '/^.*\.ss$/');
+        $finder->setOption('name_regex', static::config()->get('email_template_regex'));
 
         $parent = $this->getFormParent();