Fix notmuch_message_get_message_id to never return NULL.

With the recent improvements to the handling of message IDs we
"know" that a NULL message ID is impossible, (so we simply
abort if the impossible happens).

2 files changed, 9 insertions, 4 deletions

diff --git a/message.cc b/message.cc
index ce600af..65e5ad7 100644
--- a/message.cc
+++ b/message.cc
@@ -215,10 +215,11 @@ notmuch_message_get_message_id (notmuch_message_t *message)
     i = message->doc.termlist_begin ();
     i.skip_to (_find_prefix ("msgid"));
 
-    /* XXX: This should really be an internal error, but we'll need to
-     * fix the add_message side of things first. */
-    if (i == message->doc.termlist_end ())
-	return NULL;
+    if (i == message->doc.termlist_end ()) {
+	fprintf (stderr, "Internal error: Message with document ID of %d has no message ID.\n",
+		 message->doc_id);
+	exit (1);
+    }
 
     message->message_id = talloc_strdup (message, (*i).c_str () + 1);
     return message->message_id;
diff --git a/notmuch.h b/notmuch.h
index 57ff8c8..f568bc0 100644
--- a/notmuch.h
+++ b/notmuch.h
@@ -338,6 +338,10 @@ notmuch_results_destroy (notmuch_results_t *results);
  * modified by the caller and will only be valid for as long as the
  * message is valid, (which is until the query from which it derived
  * is destroyed).
+ *
+ * This function will not return NULL since Notmuch ensures that every
+ * message has a unique message ID, (Notmuch will generate an ID for a
+ * message if the original file does not contain one).
  */
 const char *
 notmuch_message_get_message_id (notmuch_message_t *message);