+my %escapes = (
+ '^' => sub { '^' },
+ 'n' => sub { shift->name },
+ 'g' => sub { _abs2rel(shift->repo, shift->root) },
+ 'G' => sub { shift->repo },
+ 'w' => sub { _abs2rel(shift->work, shift->root) },
+ 'W' => sub { shift->work },
+ 'b' => sub {
+ my ($self, $conf) = @_;
+ _abs2rel($self->bare ? $self->repo : $self->work . '.git', $conf->root)
+ },
+ 'B' => sub { $_[0]->bare ? $_[0]->repo : $_[0]->work . '.git' },
+ 'R' => sub { $_[1]->root },
+);
+my $e = quotemeta join '', keys %escapes;
+$e = "[$e]";
+