Checking and propagating tag_op_list_apply() errors is especially
important with batch tagging, as the processing of the batch input
would not stop otherwise. Additionally this sets the exit code, which
is useful in scripts.
---
 notmuch-tag.c |    7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/notmuch-tag.c b/notmuch-tag.c
index 4272426..16b1668 100644
--- a/notmuch-tag.c
+++ b/notmuch-tag.c
@@ -97,6 +97,7 @@ tag_query (void *ctx, notmuch_database_t *notmuch, const char 
*query_string,
     notmuch_query_t *query;
     notmuch_messages_t *messages;
     notmuch_message_t *message;
+    int ret = 0;

     /* Optimize the query so it excludes messages that already have
      * the specified set of tags. */
@@ -119,13 +120,15 @@ tag_query (void *ctx, notmuch_database_t *notmuch, const 
char *query_string,
         notmuch_messages_valid (messages) && ! interrupted;
         notmuch_messages_move_to_next (messages)) {
        message = notmuch_messages_get (messages);
-       tag_op_list_apply (message, tag_ops, flags | TAG_FLAG_PRE_OPTIMIZED);
+       ret = tag_op_list_apply (message, tag_ops, flags | 
TAG_FLAG_PRE_OPTIMIZED);
        notmuch_message_destroy (message);
+       if (ret)
+           break;
     }

     notmuch_query_destroy (query);

-    return interrupted;
+    return ret || interrupted;
 }

 static int
-- 
1.7.10.4

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