new: Synchronize maildir flags eagerly.

Because flag synchronization is stateless, it can be performed at any
time as long as it's guaranteed to be performed after any change to a
message's filename list.  Take advantage of this to synchronize tags
immediately after a filename is added or removed.

This does not yet make adding or removing a message atomic, but it is
a big step toward atomicity because it reduces the window where the
database tags are inconsistent from nearly the entire notmuch-new to
just around when the message is added or removed.

diff --git a/notmuch-new.c b/notmuch-new.c
index 455ac10323f4c28c34f0bba5b5fcc3e9336c5fda..598a2083ffaec689285878a6a4b873d8d6f4b245 100644 (file)
--- a/notmuch-new.c
+++ b/notmuch-new.c
@@ -50,7 +50,6 @@ typedef struct {
     _filename_list_t *directory_mtimes;
 
     notmuch_bool_t synchronize_flags;
-    _filename_list_t *message_ids_to_sync;
 } add_files_state_t;
 
 static volatile sig_atomic_t do_print_progress = 0;
@@ -465,11 +464,8 @@ add_files_recursive (notmuch_database_t *notmuch,
            break;
        /* Non-fatal issues (go on to next file) */
        case NOTMUCH_STATUS_DUPLICATE_MESSAGE_ID:
-           /* Defer sync of maildir flags until after old filenames
-            * are removed in the case of a rename. */
            if (state->synchronize_flags == TRUE)
-               _filename_list_add (state->message_ids_to_sync,
-                                   notmuch_message_get_message_id (message));
+               notmuch_message_maildir_flags_to_tags (message);
            break;
        case NOTMUCH_STATUS_FILE_NOT_EMAIL:
            fprintf (stderr, "Note: Ignoring non-mail file: %s\n",
@@ -731,11 +727,16 @@ remove_filename (notmuch_database_t *notmuch,
                 add_files_state_t *add_files_state)
 {
     notmuch_status_t status;
+    notmuch_message_t *message;
+    message = notmuch_database_find_message_by_filename (notmuch, path);
     status = notmuch_database_remove_message (notmuch, path);
-    if (status == NOTMUCH_STATUS_DUPLICATE_MESSAGE_ID)
+    if (status == NOTMUCH_STATUS_DUPLICATE_MESSAGE_ID) {
        add_files_state->renamed_messages++;
-    else
+       if (add_files_state->synchronize_flags == TRUE)
+           notmuch_message_maildir_flags_to_tags (message);
+    } else
        add_files_state->removed_messages++;
+    notmuch_message_destroy (message);
     return status;
 }
 
@@ -810,7 +811,6 @@ notmuch_new_command (void *ctx, int argc, char *argv[])
 
     add_files_state.new_tags = notmuch_config_get_new_tags (config, &add_files_state.new_tags_length);
     add_files_state.synchronize_flags = notmuch_config_get_maildir_synchronize_flags (config);
-    add_files_state.message_ids_to_sync = _filename_list_create (ctx);
     db_path = notmuch_config_get_database_path (config);
 
     dot_notmuch_path = talloc_asprintf (ctx, "%s/%s", db_path, ".notmuch");
@@ -911,32 +911,6 @@ notmuch_new_command (void *ctx, int argc, char *argv[])
     talloc_free (add_files_state.removed_directories);
     talloc_free (add_files_state.directory_mtimes);
 
-    /* Now that removals are done (hence the database is aware of all
-     * renames), we can synchronize maildir_flags to tags for all
-     * messages that had new filenames appear on this run. */
-    gettimeofday (&tv_start, NULL);
-    if (add_files_state.synchronize_flags) {
-       _filename_node_t *node;
-       notmuch_message_t *message;
-       for (node = add_files_state.message_ids_to_sync->head, i = 0;
-            node;
-            node = node->next, i++)
-       {
-           message = notmuch_database_find_message (notmuch, node->filename);
-           notmuch_message_maildir_flags_to_tags (message);
-           notmuch_message_destroy (message);
-           if (do_print_progress) {
-               do_print_progress = 0;
-               generic_print_progress (
-                   "Synchronized tags for", "messages",
-                   tv_start, i, add_files_state.message_ids_to_sync->count);
-           }
-       }
-    }
-
-    talloc_free (add_files_state.message_ids_to_sync);
-    add_files_state.message_ids_to_sync = NULL;
-
     if (timer_is_active)
        stop_progress_printing_timer ();