[PATCH 4/8] lib: push error from nme_metadata through nme_filename_list

[David Bremner <david@tethera.net>]

The NULL returns documented here are not actually API changing, they
were just previously undocumented.
---
 lib/message.cc | 20 +++++++++++++-------
 lib/notmuch.h  |  4 ++++
 2 files changed, 17 insertions(+), 7 deletions(-)

diff --git a/lib/message.cc b/lib/message.cc
index 16ea980c..f55dd9fa 100644
--- a/lib/message.cc
+++ b/lib/message.cc
@@ -843,16 +843,19 @@ _notmuch_message_clear_data (notmuch_message_t *message)
     message->modified = TRUE;
 }
 
-static void
+static notmuch_private_status_t
 _notmuch_message_ensure_filename_list (notmuch_message_t *message)
 {
     notmuch_string_node_t *node;
 
     if (message->filename_list)
-	return;
+	return NOTMUCH_PRIVATE_STATUS_SUCCESS;
 
-    if (!message->filename_term_list)
-	_notmuch_message_ensure_metadata (message);
+    if (!message->filename_term_list) {
+	notmuch_private_status_t status = _notmuch_message_ensure_metadata (message);
+	if (status)
+	    return status;
+    }
 
     message->filename_list = _notmuch_string_list_create (message);
     node = message->filename_term_list->head;
@@ -873,7 +876,7 @@ _notmuch_message_ensure_filename_list (notmuch_message_t *message)
 
 	_notmuch_string_list_append (message->filename_list, data);
 
-	return;
+	return NOTMUCH_PRIVATE_STATUS_SUCCESS;
     }
 
     for (; node; node = node->next) {
@@ -913,12 +916,14 @@ _notmuch_message_ensure_filename_list (notmuch_message_t *message)
 
     talloc_free (message->filename_term_list);
     message->filename_term_list = NULL;
+    return NOTMUCH_PRIVATE_STATUS_SUCCESS;
 }
 
 const char *
 notmuch_message_get_filename (notmuch_message_t *message)
 {
-    _notmuch_message_ensure_filename_list (message);
+    if (_notmuch_message_ensure_filename_list (message))
+	return NULL;
 
     if (message->filename_list == NULL)
 	return NULL;
@@ -935,7 +940,8 @@ notmuch_message_get_filename (notmuch_message_t *message)
 notmuch_filenames_t *
 notmuch_message_get_filenames (notmuch_message_t *message)
 {
-    _notmuch_message_ensure_filename_list (message);
+    if (_notmuch_message_ensure_filename_list (message))
+	return NULL;
 
     return _notmuch_filenames_create (message, message->filename_list);
 }
diff --git a/lib/notmuch.h b/lib/notmuch.h
index 62866e5a..4e25958c 100644
--- a/lib/notmuch.h
+++ b/lib/notmuch.h
@@ -1341,6 +1341,8 @@ notmuch_message_get_replies (notmuch_message_t *message);
  * this function will arbitrarily return a single one of those
  * filenames. See notmuch_message_get_filenames for returning the
  * complete list of filenames.
+ *
+ * The function returns NULL on error.
  */
 const char *
 notmuch_message_get_filename (notmuch_message_t *message);
@@ -1354,6 +1356,8 @@ notmuch_message_get_filename (notmuch_message_t *message);
  *
  * Each filename in the iterator is an absolute filename, (the initial
  * component will match notmuch_database_get_path() ).
+ *
+ * The function returns NULL on error.
  */
 notmuch_filenames_t *
 notmuch_message_get_filenames (notmuch_message_t *message);
-- 
2.11.0