Hmm, gnomon is a neat little tool. Just for the heck of it, here's a really simple Perl version (works on Linux, probably not on Windows):
#!/usr/bin/env perl
use warnings;
use strict;
use IO::Select;
use Time::HiRes qw/ gettimeofday tv_interval /;
my $sel = IO::Select->new(\*STDIN);
$|=1;
my $t0 = [gettimeofday];
while (1) {
my $line;
if ($sel->can_read(.1))
{ defined( $line = <STDIN> ) or last }
printf "%7.3f | %s", tv_interval($t0), $line//"\r";
$t0 = [gettimeofday] if defined $line;
}
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