die $err if $err;
+} elsif ($clicmd eq 'print-links-json') {
+
+ my $outfile;
+
+ GetOptions("outfile=s" => \$outfile,
+ "verbose" => \$verbose) or
+ die("Error in command line arguments\n");
+
+ scalar(@ARGV) == 0 or
+ die "too many arguments...\n";
+
+ my $data = {};
+
+ foreach my $blockid (sort keys %{$fileinfo->{blockid_target}->{default}}) {
+ my $link = $fileinfo->{blockid_target}->{default}->{$blockid};
+ my $reftitle = $fileinfo->{reftitle}->{default}->{$blockid};
+ my $reftext = $fileinfo->{reftext}->{default}->{$blockid};
+ die "internal error" if $link !~ m/^link:/;
+ $link =~ s/^link://;
+
+ my $file = $fileinfo->{blockid}->{default}->{$blockid};
+ die "internal error - no filename" if ! defined($file);
+ my $title = $fileinfo->{titles}->{default}->{$file} ||
+ die "internal error - no title";
+
+ $data->{$blockid}->{title} = $title;
+ $data->{$blockid}->{link} = $link;
+ my $subtitle = $reftitle || $reftext;
+ $data->{$blockid}->{subtitle} = $subtitle
+ if $subtitle && ($title ne $subtitle);
+ }
+
+ my $res = to_json($data, { pretty => 1, canonical => 1 } );
+
+ if (defined($outfile)) {
+ my $outfh = IO::File->new("$outfile", "w") or
+ die "unable to open temporary file '$outfile'\n";
+
+ print $outfh $res;
+
+ } else {
+
+ print $res;
+ }
+
} else {
die "unknown command '$clicmd'\n";