X-Git-Url: https://git.notmuchmail.org/git?a=blobdiff_plain;f=lib%2Fnotmuch-private.h;h=5a0cf92540619ff5fa50951c5326c84e191051b8;hb=8369ed31d0d687c35dc2464b347dadf16962cd27;hp=3768d6f88d034bd3fe4401fa8993b56d6cd0deb5;hpb=5b8b0377cb68904eac8fc58a933d47f605a81725;p=notmuch

diff --git a/lib/notmuch-private.h b/lib/notmuch-private.h
index 3768d6f8..5a0cf925 100644
--- a/lib/notmuch-private.h
+++ b/lib/notmuch-private.h
@@ -108,6 +108,16 @@ typedef enum {
  * programmatically. */
 #define NOTMUCH_TERM_MAX 245
 
+#define NOTMUCH_METADATA_THREAD_ID_PREFIX "thread_id_"
+
+/* For message IDs we have to be even more restrictive. Beyond fitting
+ * into the term limit, we also use message IDs to construct
+ * metadata-key values. And the documentation says that these should
+ * be restricted to about 200 characters. (The actual limit for the
+ * chert backend at least is 252.)
+ */
+#define NOTMUCH_MESSAGE_ID_MAX (200 - sizeof (NOTMUCH_METADATA_THREAD_ID_PREFIX))
+
 typedef enum _notmuch_private_status {
     /* First, copy all the public status values. */
     NOTMUCH_PRIVATE_STATUS_SUCCESS = NOTMUCH_STATUS_SUCCESS,
@@ -167,6 +177,9 @@ _notmuch_database_split_path (void *ctx,
 const char *
 _notmuch_database_get_directory_db_path (const char *path);
 
+unsigned int
+_notmuch_database_generate_doc_id (notmuch_database_t *notmuch);
+
 notmuch_private_status_t
 _notmuch_database_find_unique_doc_id (notmuch_database_t *notmuch,
 				      const char *prefix_name,