lei forget-mail-sync: new command to drop sync information

Sometimes a user stops caring to sync an IMAP or Maildir
folder, or wants to force a resync.  Let them run this
command to have lei forget all the sync information about
the mail folder.

This won't delete any stored messages in git, but will
leave "lei index" users with dangling references.

1 files changed, 11 insertions, 0 deletions

diff --git a/lib/PublicInbox/LeiMailSync.pm b/lib/PublicInbox/LeiMailSync.pm
index 094cf1fd..d9c30580 100644
--- a/lib/PublicInbox/LeiMailSync.pm
+++ b/lib/PublicInbox/LeiMailSync.pm
@@ -345,4 +345,15 @@ EOF
         $err;
 }
 
+sub forget_folder {
+        my ($self, $folder) = @_;
+        my ($fid, $sth);
+        $fid = delete($self->{fmap}->{$folder}) //
+                _fid_for($self, $folder) // return;
+        my $dbh = $self->{dbh};
+        $dbh->do('DELETE FROM blob2name WHERE fid = ?', undef, $fid);
+        $dbh->do('DELETE FROM blob2num WHERE fid = ?', undef, $fid);
+        $dbh->do('DELETE FROM folders WHERE fid = ?', undef, $fid);
+}
+
 1;