feat: use vacation subject prefix

scripts/global_autoresponder_worker.php

@@ -55,15 +55,19 @@ final class GlobalAutoresponderWorker
             if ($ruleId === '') {
                 continue;
             }
-            $repeatMinutes = $this->settings->replyEveryMessage() ? 0 : $this->settings->repeatMinutes();
+            $repeatMinutes = !empty($rule['reply_every_message']) ? 0 : max(0, (int)($rule['repeat_minutes'] ?? 1440));
             if (!$this->repeat->shouldSend($owner, $ruleId, $recipient, $sender, $repeatMinutes)) {
                 continue;
             }
+            $replySubject = self::replySubject(
+                (string)($rule['subject_prefix'] ?? $rule['subject'] ?? ''),
+                self::headerValue($headers, 'subject')
+            );
             $ok = (bool)call_user_func(
                 $this->send,
                 $recipient,
                 strtolower($sender),
-                (string)$rule['subject'],
+                $replySubject,
                 (string)$rule['body']
             );
             if ($ok) {
@@ -155,6 +159,30 @@ final class GlobalAutoresponderWorker
         }
         return $headers;
     }
+
+    /** @param array<string,string> $headers */
+    private static function headerValue(array $headers, string $name): string
+    {
+        foreach ($headers as $key => $value) {
+            if (strcasecmp($key, $name) === 0) {
+                return trim($value);
+            }
+        }
+        return '';
+    }
+
+    private static function replySubject(string $prefix, string $originalSubject): string
+    {
+        $prefix = trim($prefix);
+        $originalSubject = trim($originalSubject);
+        if ($prefix !== '' && $originalSubject !== '') {
+            return str_ends_with($prefix, ':') ? $prefix . ' ' . $originalSubject : $prefix . ': ' . $originalSubject;
+        }
+        if ($prefix !== '') {
+            return $prefix;
+        }
+        return $originalSubject !== '' ? $originalSubject : 'Automatic reply';
+    }
 }
 
 if (PHP_SAPI === 'cli' && realpath((string)($_SERVER['SCRIPT_FILENAME'] ?? '')) === __FILE__) {