X-Git-Url: https://git.notmuchmail.org/git?p=notmuch;a=blobdiff_plain;f=lib%2Fdatabase-private.h;h=15e03ccf6d6f433bdd7550654bd7b092ef97f585;hp=ca0751cf2e1001943bd7a7adbf27554be57f1acc;hb=ee476f1e7616fa53c492b8077b55af35662eec82;hpb=8363c9053152d349022b821a4a343f0ee2ade318

diff --git a/lib/database-private.h b/lib/database-private.h
index ca0751cf..15e03ccf 100644
--- a/lib/database-private.h
+++ b/lib/database-private.h
@@ -85,6 +85,13 @@ enum _notmuch_features {
      *
      * Introduced: version 2. */
     NOTMUCH_FEATURE_BOOL_FOLDER = 1 << 3,
+
+    /* If set, missing messages are stored in ghost mail documents.
+     * If unset, thread IDs of ghost messages are stored as database
+     * metadata instead of in ghost documents.
+     *
+     * Introduced: version 3. */
+    NOTMUCH_FEATURE_GHOSTS = 1 << 4,
 };
 
 /* In C++, a named enum is its own type, so define bitwise operators
@@ -159,7 +166,7 @@ struct _notmuch_database {
  * databases will have it). */
 #define NOTMUCH_FEATURES_CURRENT \
     (NOTMUCH_FEATURE_FILE_TERMS | NOTMUCH_FEATURE_DIRECTORY_DOCS | \
-     NOTMUCH_FEATURE_BOOL_FOLDER)
+     NOTMUCH_FEATURE_BOOL_FOLDER | NOTMUCH_FEATURE_GHOSTS)
 
 /* Return the list of terms from the given iterator matching a prefix.
  * The prefix will be stripped from the strings in the returned list.