From d0f1eccd06746b602fcc468a6d14465c0195004d Mon Sep 17 00:00:00 2001
From: Daniel Friesel <derf@finalrewind.org>
Date: Wed, 13 Jul 2011 13:33:17 +0200
Subject: DeutscheBahn/Result: Add route_interesting accessor

---
 Changelog                                   |  1 +
 bin/db-ris                                  | 42 +--------------------
 lib/Travel/Status/DE/DeutscheBahn/Result.pm | 57 +++++++++++++++++++++++++++++
 3 files changed, 60 insertions(+), 40 deletions(-)

diff --git a/Changelog b/Changelog
index ff7b584..f390f9f 100644
--- a/Changelog
+++ b/Changelog
@@ -4,6 +4,7 @@ git HEAD
     * The info accessor now strips the mostly useless "k.A." / "pünktlich"
       (train on time) text parts
     * Use the new info_raw accessor to get the old info results
+    * Add (slightly experimental) route_interesting accessor
 
 Travel::Status::DE::DeutscheBahn 0.03 - Wed Jul 13 2011
 
diff --git a/bin/db-ris b/bin/db-ris
index 962b5cd..d787073 100755
--- a/bin/db-ris
+++ b/bin/db-ris
@@ -84,47 +84,9 @@ sub display_result {
 	return;
 }
 
-sub filter_via {
-	my (@via) = @_;
-
-	my ( @via_main, @via_show, $last_stop );
-
-	for my $stop (@via) {
-		if ( $stop =~ m{ ?Hbf} ) {
-			push( @via_main, $stop );
-		}
-	}
-	$last_stop = pop(@via);
-
-	if ( @via_main and @via and $via[0] eq $via_main[0] ) {
-		shift(@via_main);
-	}
-
-	if ( @via < 3 ) {
-		@via_show = @via;
-	}
-	else {
-		@via_show = splice( @via, 0, ( @via_main > 2 ? 1 : 3 - @via_main ) );
-
-		while ( @via_show < 3 and @via_main ) {
-			my $stop = shift(@via_main);
-			if ( $stop ~~ \@via_show or $stop eq $last_stop ) {
-				next;
-			}
-			push( @via_show, $stop );
-		}
-	}
-
-	for my $stop (@via_show) {
-		$stop =~ s{ ?Hbf}{};
-	}
-
-	return @via_show;
-}
-
 for my $d ( $status->results() ) {
 
-	my ( @via, @via_main, @via_show );
+	my @via;
 
 	my $re_late = qr{ (?: ^ | , ) ca[.] \s \d+ \s Minuten \s sp.ter}ox;
 
@@ -142,7 +104,7 @@ for my $d ( $status->results() ) {
 		@output,
 		[
 			$d->time, $d->train,
-			join( q{  }, filter_via(@via) ), $d->destination,
+			join( q{  }, $d->route_interesting ), $d->destination,
 			$d->platform, $d->info,
 		]
 	);
diff --git a/lib/Travel/Status/DE/DeutscheBahn/Result.pm b/lib/Travel/Status/DE/DeutscheBahn/Result.pm
index 660abc5..5c2e9e1 100644
--- a/lib/Travel/Status/DE/DeutscheBahn/Result.pm
+++ b/lib/Travel/Status/DE/DeutscheBahn/Result.pm
@@ -50,6 +50,52 @@ sub route {
 	return @{ $self->{route} };
 }
 
+sub route_interesting {
+	my ( $self, $max_parts ) = @_;
+
+	my @via = $self->route;
+	my ( @via_main, @via_show, $last_stop );
+	$max_parts //= 3;
+
+	for my $stop (@via) {
+		if ( $stop =~ m{ ?Hbf}o ) {
+			push( @via_main, $stop );
+		}
+	}
+	$last_stop = pop(@via);
+
+	if ( @via_main and @via and $via[0] eq $via_main[0] ) {
+		shift(@via_main);
+	}
+
+	if ( @via < $max_parts ) {
+		@via_show = @via;
+	}
+	else {
+		if ( @via_main >= $max_parts ) {
+			@via_show = ( $via[0] );
+		}
+		else {
+			@via_show = splice( @via, 0, $max_parts - @via_main );
+		}
+
+		while ( @via_show < $max_parts and @via_main ) {
+			my $stop = shift(@via_main);
+			if ( $stop ~~ \@via_show or $stop eq $last_stop ) {
+				next;
+			}
+			push( @via_show, $stop );
+		}
+	}
+
+	for (@via_show) {
+		s{ ?Hbf}{};
+	}
+
+	return @via_show;
+
+}
+
 1;
 
 __END__
@@ -131,6 +177,17 @@ arrive.
 Returns a list of station names the train will pass between the selected
 station and its origin/destination.
 
+=item $result->route_interesting([I<max>])
+
+Returns a list of (at most I<max>) interesting stations the train will pass on
+its journey. This is somewhat tricky (and therefore experimental).
+
+The first element of the list is always the train's next stop. The following
+elements contain as many main stations as possible, but there may also be
+smaller stations if not enough main stations are available.
+
+Note that all main stations will be stripped of their "Hbf" suffix.
+
 =item $result->route_raw
 
 Returns the raw string used to create the route array.
-- 
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