In case last input for batch tagging was either invalid or skippable
line, notmuch command exited with non-zero value.
After this change if there is at least one invalid line, notmuch
command will exit with non-zero value. Additionally, skipped lines
(last or other) doesn't cause non-zero value to be returned.
---
 notmuch-tag.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/notmuch-tag.c b/notmuch-tag.c
index 6408bab..b54c55d 100644
--- a/notmuch-tag.c
+++ b/notmuch-tag.c
@@ -140,6 +140,7 @@ tag_file (void *ctx, notmuch_database_t *notmuch, 
tag_op_flag_t flags,
     size_t line_size = 0;
     ssize_t line_len;
     int ret = 0;
+    int warn = 0;
     tag_op_list_t *tag_ops;
 
     tag_ops = tag_op_list_create (ctx);
@@ -154,8 +155,13 @@ tag_file (void *ctx, notmuch_database_t *notmuch, 
tag_op_flag_t flags,
        ret = parse_tag_line (ctx, line, TAG_FLAG_NONE,
                              &query_string, tag_ops);
 
-       if (ret > 0)
+       if (ret > 0) {
+           if (ret != TAG_PARSE_SKIPPED)
+               /* remember there has been problematic lines */
+               warn = 1;
+           ret = 0;
            continue;
+       }
 
        if (ret < 0)
            break;
@@ -168,7 +174,7 @@ tag_file (void *ctx, notmuch_database_t *notmuch, 
tag_op_flag_t flags,
     if (line)
        free (line);
 
-    return ret;
+    return ret || warn;
 }
 
 int
-- 
1.8.0

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