[TASK] Imrove mail content template parsing capabilities

Classes/Utility/MailUtility.php

@@ -26,6 +26,49 @@ use TYPO3\CMS\Extbase\Configuration\ConfigurationManagerInterface;
  */
 class MailUtility
 {
+    /**
+     * Parse text with a simple "template system" to be used as data for
+     * sendMail function
+     *
+     * @param string $text
+     * @param array $markers
+     * @return array
+     */
+    public static function parseContentTemplate(
+        $text,
+        $markers = []
+    ) {
+        $textParts = explode("\r\n\r\n", $text);
+        $result = [];
+        foreach ($textParts as $textPart) {
+            $type = 'text';
+            if (substr($textPart, 0, 2) === '# ') {
+                $type = 'headline';
+                $textPart = substr($textPart, 2);
+            }
+            if (substr($textPart, 0, 3) === '## ') {
+                $type = 'headline2';
+                $textPart = substr($textPart, 3);
+            }
+            if (substr($textPart, 0, 4) === '### ') {
+                $type = 'headline3';
+                $textPart = substr($textPart, 4);
+            }
+            foreach ($markers as $markerName => $markerContent) {
+                $textPart = str_replace(
+                    '###' . $markerName . '###',
+                    $markerContent,
+                    $textPart
+                );
+            }
+            $result[] = [
+                'type' => $type,
+                'data' => $textPart,
+            ];
+        }
+        return $result;
+    }
+
     /**
      * tages maildata, builds html and text mails an decides where to send them
      * allows to intercept sender for testing
@@ -88,6 +131,8 @@ class MailUtility
             switch($row['type']) {
                 case 'text':
                 case 'headline':
+                case 'headline2':
+                case 'headline3':
                     $htmlRow = $row;
                     $htmlRow['data'] = preg_replace_callback(
                         '/\[.*\]/mU',