ANSI escapes in "new" only when output is a tty

When running "notmuch new --verbose", ANSI escapes are used. This may not be
desirable when the output of the command is *not* being sent to a terminal
(e.g. when piping output into another command). In that case each file
processed is printed in a new line and ANSI escapes are not used at all.

1 files changed, 1 insertions, 0 deletions

diff --git a/notmuch-client.h b/notmuch-client.h
index f105c8b2..4fe182ee 100644
--- a/notmuch-client.h
+++ b/notmuch-client.h
@@ -74,6 +74,7 @@ typedef void (*add_files_callback_t) (notmuch_message_t *message);
 typedef struct {
     int ignore_read_only_directories;
     int saw_read_only_directory;
+    int output_is_a_tty;
     int verbose;
 
     int total_files;