Add accessibleExpirationDate overload for signatures

GnuPG-bug-id: 6102

src/utils/formatting.cpp

@@ -623,6 +623,15 @@ QString Formatting::accessibleExpirationDate(const Subkey &subkey, const QString
     }
 }
 
+QString Formatting::accessibleExpirationDate(const UserID::Signature &sig, const QString &noExpiration)
+{
+    if (sig.neverExpires()) {
+        return noExpiration.isEmpty() ? i18n("no expiration") : noExpiration;
+    } else {
+        return accessibleDate(expirationDate(sig));
+    }
+}
+
 QString Formatting::creationDateString(const Key &key)
 {
     return dateString(creation_date(key.subkey(0)));

src/utils/formatting.h

@@ -99,6 +99,12 @@ KLEO_EXPORT QString accessibleExpirationDate(const GpgME::Key &key, const QStrin
  * returns the localization of "no expiration".
  */
 KLEO_EXPORT QString accessibleExpirationDate(const GpgME::Subkey &subkey, const QString &noExpiration = {});
+/**
+ * Returns expiration date of @p sig as string suitable for screen readers.
+ * If the signature doesn't expire, then it returns @p noExpiration if @p noExpiration is not empty. Otherwise,
+ * returns the localization of "no expiration".
+ */
+KLEO_EXPORT QString accessibleExpirationDate(const GpgME::UserID::Signature &sig, const QString &noExpiration = {});
 
 KLEO_EXPORT QString creationDateString(const GpgME::Key &key);
 KLEO_EXPORT QString creationDateString(const GpgME::Subkey &subkey);