+static InternetAddressList *get_sender(notmuch_message_t *message,
+ GMimeMessage *mime_message)
+{
+ const char *reply_to;
+
+ reply_to = g_mime_message_get_reply_to (mime_message);
+ if (reply_to && *reply_to) {
+ /*
+ * Some mailing lists munge the Reply-To header despite it
+ * being A Bad Thing, see
+ * http://marc.merlins.org/netrants/reply-to-harmful.html
+ *
+ * The munging is easy to detect, because it results in a
+ * redundant reply-to header, (with an address that already
+ * exists in either To or Cc). So in this case, we ignore the
+ * Reply-To field and use the From header. This ensures the
+ * original sender will get the reply even if not subscribed
+ * to the list. Note that the address in the Reply-To header
+ * will always appear in the reply if reply_all is true.
+ */
+ if (! reply_to_header_is_redundant (message, reply_to))
+ return internet_address_list_parse_string (reply_to);
+ }
+
+ return internet_address_list_parse_string (
+ g_mime_message_get_sender (mime_message));
+}
+
+static InternetAddressList *get_to(unused(notmuch_message_t *message),
+ GMimeMessage *mime_message)
+{
+ return g_mime_message_get_recipients (mime_message,
+ GMIME_RECIPIENT_TYPE_TO);
+}
+
+static InternetAddressList *get_cc(unused(notmuch_message_t *message),
+ GMimeMessage *mime_message)
+{
+ return g_mime_message_get_recipients (mime_message,
+ GMIME_RECIPIENT_TYPE_CC);
+}
+
+static InternetAddressList *get_bcc(unused(notmuch_message_t *message),
+ GMimeMessage *mime_message)
+{
+ return g_mime_message_get_recipients (mime_message,
+ GMIME_RECIPIENT_TYPE_BCC);
+}
+
+/* Augment the recipients of 'reply' from the "Reply-to:", "From:",
+ * "To:", "Cc:", and "Bcc:" headers of 'message'.
+ *
+ * If 'reply_all' is true, use sender and all recipients, otherwise
+ * scan the headers for the first that contains something other than
+ * the user's addresses and add the recipients from this header
+ * (typically this would be reply-to-sender, but also handles reply to
+ * user's own message in a sensible way).
+ *
+ * If any of the user's addresses were found in these headers, the
+ * first of these returned, otherwise NULL is returned.
+ */
+static const char *
+add_recipients_from_message (GMimeMessage *reply,
+ notmuch_config_t *config,
+ notmuch_message_t *message,
+ GMimeMessage *mime_message,
+ notmuch_bool_t reply_all)