+/* Remove a particular 'filename' from 'message'.
+ *
+ * This change will not be reflected in the database until the next
+ * call to _notmuch_message_sync.
+ *
+ * If this message still has other filenames, returns
+ * NOTMUCH_STATUS_DUPLICATE_MESSAGE_ID.
+ *
+ * Note: This function does not remove a document from the database,
+ * even if the specified filename is the only filename for this
+ * message. For that functionality, see
+ * _notmuch_database_remove_message. */
+notmuch_status_t
+_notmuch_message_remove_filename (notmuch_message_t *message,
+ const char *filename)
+{
+ const char *direntry_prefix = _find_prefix ("file-direntry");
+ int direntry_prefix_len = strlen (direntry_prefix);
+ const char *folder_prefix = _find_prefix ("folder");
+ int folder_prefix_len = strlen (folder_prefix);
+ void *local = talloc_new (message);
+ char *zfolder_prefix = talloc_asprintf(local, "Z%s", folder_prefix);
+ int zfolder_prefix_len = strlen (zfolder_prefix);
+ char *direntry;
+ notmuch_private_status_t private_status;
+ notmuch_status_t status;
+ Xapian::TermIterator i, last;
+
+ status = _notmuch_database_filename_to_direntry (
+ local, message->notmuch, filename, NOTMUCH_FIND_CREATE, &direntry);
+ if (status)
+ return status;
+
+ /* Unlink this file from its parent directory. */
+ private_status = _notmuch_message_remove_term (message,
+ "file-direntry", direntry);
+ status = COERCE_STATUS (private_status,
+ "Unexpected error from _notmuch_message_remove_term");
+ if (status)
+ return status;
+
+ /* Re-synchronize "folder:" terms for this message. This requires:
+ * 1. removing all "folder:" terms
+ * 2. removing all "folder:" stemmed terms
+ * 3. adding back terms for all remaining filenames of the message. */
+
+ /* 1. removing all "folder:" terms */
+ while (1) {
+ i = message->doc.termlist_begin ();
+ i.skip_to (folder_prefix);
+
+ /* Terminate loop when no terms remain with desired prefix. */
+ if (i == message->doc.termlist_end () ||
+ strncmp ((*i).c_str (), folder_prefix, folder_prefix_len))
+ {
+ break;
+ }
+
+ try {
+ message->doc.remove_term ((*i));
+ } catch (const Xapian::InvalidArgumentError) {
+ /* Ignore failure to remove non-existent term. */
+ }
+ }
+
+ /* 2. removing all "folder:" stemmed terms */
+ while (1) {
+ i = message->doc.termlist_begin ();
+ i.skip_to (zfolder_prefix);
+
+ /* Terminate loop when no terms remain with desired prefix. */
+ if (i == message->doc.termlist_end () ||
+ strncmp ((*i).c_str (), zfolder_prefix, zfolder_prefix_len))
+ {
+ break;
+ }
+
+ try {
+ message->doc.remove_term ((*i));
+ } catch (const Xapian::InvalidArgumentError) {
+ /* Ignore failure to remove non-existent term. */
+ }
+ }
+
+ /* 3. adding back terms for all remaining filenames of the message. */
+ i = message->doc.termlist_begin ();
+ i.skip_to (direntry_prefix);
+
+ for (; i != message->doc.termlist_end (); i++) {
+ unsigned int directory_id;
+ const char *direntry, *directory;
+ char *colon;
+
+ /* Terminate loop at first term without desired prefix. */
+ if (strncmp ((*i).c_str (), direntry_prefix, direntry_prefix_len))
+ break;
+
+ /* Indicate that there are filenames remaining. */
+ status = NOTMUCH_STATUS_DUPLICATE_MESSAGE_ID;
+
+ direntry = (*i).c_str ();
+ direntry += direntry_prefix_len;
+
+ directory_id = strtol (direntry, &colon, 10);
+
+ if (colon == NULL || *colon != ':')
+ INTERNAL_ERROR ("malformed direntry");
+
+ directory = _notmuch_database_get_directory_path (local,
+ message->notmuch,
+ directory_id);
+ if (strlen (directory))
+ _notmuch_message_gen_terms (message, "folder", directory);
+ }
+
+ talloc_free (local);
+
+ return status;
+}
+