This patch allows for different flags, internal to notmuch, to be set on a
message object.  The patch does not define any such flags, just the
facilities to manage these flags.

Signed-off-by: Bart Trojanowski <bart@jukie.net>
---
 lib/message.cc |   19 +++++++++++++++++++
 lib/notmuch.h  |   14 ++++++++++++++
 2 files changed, 33 insertions(+), 0 deletions(-)

diff --git a/lib/message.cc b/lib/message.cc
index 1e325e2..e0834f1 100644
--- a/lib/message.cc
+++ b/lib/message.cc
@@ -37,6 +37,7 @@ struct _notmuch_message {
     char *filename;
     notmuch_message_file_t *message_file;
     notmuch_message_list_t *replies;
+    unsigned long flags;
 
     Xapian::Document doc;
 };
@@ -108,6 +109,7 @@ _notmuch_message_create (const void *talloc_owner,
     message->doc_id = doc_id;
 
     message->frozen = 0;
+    message->flags = 0;
 
     /* Each of these will be lazily created as needed. */
     message->message_id = NULL;
@@ -445,6 +447,23 @@ notmuch_message_get_filename (notmuch_message_t *message)
     return message->filename;
 }
 
+notmuch_bool_t
+notmuch_message_get_flag (notmuch_message_t *message,
+			  notmuch_message_flag_t flag)
+{
+    return message->flags & (1 << flag);
+}
+
+void
+notmuch_message_set_flag (notmuch_message_t *message,
+			  notmuch_message_flag_t flag, notmuch_bool_t enable)
+{
+    if (enable)
+	message->flags |= (1 << flag);
+    else
+	message->flags &= ~(1 << flag);
+}
+
 time_t
 notmuch_message_get_date (notmuch_message_t *message)
 {
diff --git a/lib/notmuch.h b/lib/notmuch.h
index 8bba442..c232c58 100644
--- a/lib/notmuch.h
+++ b/lib/notmuch.h
@@ -684,6 +684,20 @@ notmuch_message_get_replies (notmuch_message_t *message);
 const char *
 notmuch_message_get_filename (notmuch_message_t *message);
 
+/* Message flags */
+typedef enum _notmuch_message_flag {
+} notmuch_message_flag_t;
+
+/* Get a value of a flag for the email corresponding to 'message'. */
+notmuch_bool_t
+notmuch_message_get_flag (notmuch_message_t *message,
+			  notmuch_message_flag_t flag);
+
+/* Set a value of a flag for the email corresponding to 'message'. */
+void
+notmuch_message_set_flag (notmuch_message_t *message,
+			  notmuch_message_flag_t flag, notmuch_bool_t value);
+
 /* Get the date of 'message' as a time_t value.
  *
  * For the original textual representation of the Date header from the
-- 
1.6.4.4.2.gc2f148