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#! /usr/bin/perl
use Glib qw/TRUE FALSE/;
use Gtk2 '-init';
sub exit_with_error
{
my ($error)=@_;
print STDERR "$error\n";
exit(1);
}
sub process_one_packet
{
$pos[$idx++]=tell(STDIN);
while (<STDIN>) {
if (!defined($match)) {
syswrite(STDOUT,$_) or exit_with_error $!;
} else {
$buffer.=$_;
}
if (/^\$GPRMC/) {
my($dummy,$time,$dummy)=split(/,/,$_);
$entry->set_text($time);
if (!defined($match)) {
return;
}
if (substr($time,0,length($match)) eq $match) {
undef $match;
syswrite(STDOUT,$buffer) or exit_with_error $!;
return;
}
$buffer='';
}
}
}
sub process_one_packet_at_idx
{
($idx)=@_;
seek(STDIN,$pos[$idx],SEEK_SET);
process_one_packet();
}
sub forward
{
process_one_packet();
return 1;
}
sub backward
{
if ($idx > 1) {
process_one_packet_at_idx($idx-2);
}
return 1;
}
sub add_timeout
{
my ($interval,$dir)=@_;
if ($timeout > 0) {
Glib::Source->remove($timeout);
}
if ($dir > 0) {
forward();
$timeout=Glib::Timeout->add ($interval, \&forward);
}
if ($dir < 0) {
backward();
$timeout=Glib::Timeout->add ($interval, \&backward);
}
}
sub entry
{
$match=$entry->get_text();
seek(STDIN,0,SEEK_SET);
process_one_packet();
}
$oldfh = select(STDOUT); $| = 1; select($oldfh);
$window = Gtk2::Window->new('toplevel');
$box = Gtk2::HBox->new();
$window->add($box);
$button = Gtk2::Button->new("Stop");
$button->signal_connect(clicked => sub { add_timeout(0,0) });
$box->add($button);
$button = Gtk2::Button->new("100 Hz");
$button->signal_connect(clicked => sub { add_timeout(10,-1); });
$box->add($button);
$button = Gtk2::Button->new("10 Hz");
$button->signal_connect(clicked => sub { add_timeout(100,-1); });
$box->add($button);
$button = Gtk2::Button->new("1 Hz");
$button->signal_connect(clicked => sub { add_timeout(1000,-1); });
$box->add($button);
$button = Gtk2::Button->new("-");
$button->signal_connect(clicked => sub { add_timeout(0,0) ; backward() });
$box->add($button);
$entry = Gtk2::Entry->new();
$entry->set_text("???");
$entry->signal_connect(activate => \&entry);
$box->add($entry);
$button = Gtk2::Button->new("+");
$button->signal_connect(clicked => sub { add_timeout(0,0) ; forward() });
$box->add($button);
$button = Gtk2::Button->new("1 Hz");
$button->signal_connect(clicked => sub { add_timeout(1000,1); });
$box->add($button);
$button = Gtk2::Button->new("10 Hz");
$button->signal_connect(clicked => sub { add_timeout(100,1); });
$box->add($button);
$button = Gtk2::Button->new("100 Hz");
$button->signal_connect(clicked => sub { add_timeout(10,1); });
$box->add($button);
$button = Gtk2::Button->new("Max");
$button->signal_connect(clicked => sub { add_timeout(1,1); });
$box->add($button);
$window->show_all;
Gtk2->main;
0;
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