Journey: Add trip_no_at accessor

Closes #9

1 files changed, 22 insertions, 0 deletions

diff --git a/lib/Travel/Status/DE/DBRIS/Journey.pm b/lib/Travel/Status/DE/DBRIS/Journey.pm
index e87a73e..e40aaaf 100644
--- a/lib/Travel/Status/DE/DBRIS/Journey.pm
+++ b/lib/Travel/Status/DE/DBRIS/Journey.pm
@@ -227,6 +227,21 @@ sub trip_numbers {
 	return @{ $self->{trip_numbers} // [] };
 }
 
+sub trip_no_at {
+	my ( $self, $loc, $ts ) = @_;
+	for my $stop ( $self->route ) {
+		if ( $stop->name eq $loc or $stop->eva eq $loc ) {
+			if (   not defined $ts
+				or not( $stop->sched_dep // $stop->sched_arr )
+				or ( $stop->sched_dep // $stop->sched_arr )->epoch == $ts )
+			{
+				return $stop->trip_no;
+			}
+		}
+	}
+	return;
+}
+
 sub TO_JSON {
 	my ($self) = @_;
 
@@ -318,6 +333,13 @@ Textual description of the departure, typically consisting of type identifier
 
 Trip number, if available. undef otherwise.
 
+=item $journey->trip_no_at($stop, $epoch)
+
+Return trip number at I<$stop> (name or EVA ID), if available.  Optionally,
+I<$epoch> can be used to only match stops where scheduled departure or arrival
+is equal to I<$epoch>. This is useful in case a trip passes the same stop
+multiple times.
+
 =item $journey->line_no
 
 Line identifier, if available. undef otherwise. Note that the line identifier