#!/usr/bin/env perl

$beeps=$count=3;
$from=80;
$to=440;
$step=30;

for ($i = 0; $i <= $#ARGV; ++$i) {
    $_ = $ARGV[$i];
  ARGL:
    { /^0$/  && exit 0;
      /^\d+/ && do { $count = $_; last ARGL; };
      /^-nice(up|on)$/    && do { $niceup   = 1; last ARGL; };
      /^-nice(down|off)$/ && do { $nicedown = 1; last ARGL; };
      /^-from$/ && do { $from = $ARGV[++$i]; last ARGL; };
      /^-to$/   && do { $to   = $ARGV[++$i]; last ARGL; };
      /^-step$/ && do { $step = $ARGV[++$i]; last ARGL; };
      print "usage: $0 [-niceup|-niceon] [-nicedown|-niceoff] [num_of_beeps]
default number of beeps: $beeps
by Slaven Rezic (eserte\@cs.tu-berlin.de), 14-05-1993
";
    exit 0;
  }
}

$count = $beeps if !defined $count;

eval '
sub try_x11_beep {
    use X11::Protocol;
    my $x = new X11::Protocol;
    die "Does not work well with VNC"
        if ($x->{"vendor"} =~ /AT&T Laboratories Cambridge/ ||
            $x->{"vendor"} =~ /The Olivetti & Oracle Research Laboratory/);
    my %old_settings = $x->GetKeyboardControl;

    my $test;
    if ($nicedown) {
        ($to, $from) = ($from, $to);
        $step = -$step;
        $test = sub { $_[0] >= $to };
    } else {
        $test = sub { $_[0] <= $to };
    }
    for(my $pitch=$from; $test->($pitch); $pitch+=$step) {
        $x->ChangeKeyboardControl(bell_pitch => $pitch,
                                  bell_percent => 50);
        $x->Bell(10);
        select(undef,undef,undef,0.05);
    }

    $x->ChangeKeyboardControl(bell_percent  => $old_settings{bell_percent},
                              bell_pitch    => $old_settings{bell_pitch},
                              bell_duration => $old_settings{bell_duration},
                              );
}
';
#warn $@ if $@;

if ($niceup || $nicedown) {
    eval 'try_x11_beep()';
    exit(0) if (!$@);
    #warn $@ if $@;
    $count = $beeps;
}

$| = 1;                         # flush output
for($i=0; $i<$count; $i++) {
    print "\a";
    select(undef, undef, undef, 0.2); # sleep 0.2 secs
}