+=item h_labels END_TIMESTAMP [ START_TIMESTAMP ]
+
+Like the labels method, but returns historical information on services that
+were active as of END_TIMESTAMP and (optionally) not cancelled before
+START_TIMESTAMP.
+
+Returns a list of lists, calling the label method for all (historical) services
+(see L<FS::h_cust_svc>) of this billing item.
+
+=cut
+
+sub h_labels {
+ my $self = shift;
+ map { [ $_->label(@_) ] } $self->h_cust_svc(@_);
+}
+
+=item h_labels_short END_TIMESTAMP [ START_TIMESTAMP ]
+
+Like h_labels, except returns a simple flat list, and shortens long
+(currently >5) lists of identical services to one line that lists the service
+label and the number of individual services rather than individual items.
+
+=cut
+
+sub h_labels_short {
+ my $self = shift;
+
+ my %labels;
+ #tie %labels, 'Tie::IxHash';
+ push @{ $labels{$_->[0]} }, $_->[1]
+ foreach $self->h_labels(@_);
+ my @labels;
+ foreach my $label ( keys %labels ) {
+ my @values = @{ $labels{$label} };
+ my $num = scalar(@values);
+ if ( $num > 5 ) {
+ push @labels, "$label ($num)";
+ } else {
+ push @labels, map { "$label: $_" } @values;
+ }
+ }
+
+ @labels;
+
+}
+