Improve(?) error handling

bin/efa

@@ -97,8 +97,8 @@ $efa = WWW::Efa->new(
 	max_interchanges  => $opt->{'max-change'},
 );
 
-if (my $err = $efa->setup_error()) {
-	die $err->as_string();
+if ($efa->error()) {
+	die $efa->error()->as_string();
 }
 
 if ($opt->{'test-parse'}) {
@@ -111,11 +111,7 @@ else {
 	);
 }
 
-my $err = $efa->parse();
-
-if ($err and $err->isa('WWW::Efa::Error')) {
-	die $err->as_string();
-}
+$efa->parse or die $efa->error()->as_string();
 
 my @connections = $efa->connections();
 

lib/WWW/Efa.pm

@@ -477,6 +477,9 @@ If true: Prefer connections allowing to take a bike along
 
 =back
 
+When encountering invalid hash keys, a WWW::Efa::Error object is stored to be
+retrieved by $efa->error();
+
 =cut
 
 sub new {
@@ -495,15 +498,15 @@ sub new {
 	return bless($ref, $obj);
 }
 
-=head2 $efa->setup_error()
+=head2 $efa->error()
 
-In case WWW::Efa->new() encountered an error (usually invalid options), this
-returns a B<WWW::Efa::Error::Setup> object describing the exact error.
-Otherwise, returns nothing.
+In case a WWW::Efa operation encountered an error, this returns a
+B<WWW::Efa::Error> object related to the exact error. Otherwise, returns
+undef.
 
 =cut
 
-sub setup_error {
+sub error {
 	my ($self) = @_;
 
 	if ($self->{'error'}) {
@@ -543,7 +546,8 @@ sub submit {
 =head2 $efa->parse()
 
 Parse the B<efa.vrr.de> reply.
-Returns undef on success and a WWW::Efa::Error object upon failure.
+returns a true value on success. Upon failure, returns undef and sets
+$efa->error() to a WWW::Efa::Error object.
 
 =cut
 
@@ -568,17 +572,16 @@ sub parse {
 
 	if ($err = $self->check_ambiguous()) {
 		$self->{'error'} = $err;
-		return $err;
 	}
 	elsif ($err = $self->check_no_connections()) {
 		$self->{'error'} = $err;
-		return $err;
 	}
-	elsif ($self->{'error'}) {
-		return $self->{'error'};
+
+	if ($self->{'error'}) {
+		return;
 	}
 
-	return $self->{'error'};
+	return 1;
 }
 
 sub check_ambiguous {