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#!/usr/bin/perl
# logger.pl: masks long meaningless output with pretty lines of dots
# Details: 1) reads lines from STDIN and echos them on STDOUT,
# 2) print a '.' to STDERR every $N lines.
# 3) print a newline after a sequence of $C dots
use strict;
use warnings;
# make sure all output gets displayed immediately
$| = 1;
# TODO: add -n and -c options w/ zero checks)
# line and column limits
my $N = 10;
my $C = 72;
# current line and column counters
my $n = 0;
my $c = 0;
# read all lines from STDIN
while (<STDIN>)
{
# echo line to output
print STDOUT $_;
# echo line to console if it is important
if (/(Warning|Error)/) {
print STDERR "\n" if $c;
print STDERR $_;
$c = 0;
}
# only display progress every Nth step
next if ++$n % $N;
print STDERR ".";
# wrap at column C to provide fixed-width rows of dots
print STDERR "\n" unless ++$c % $C;
}
print STDERR "\n" if $c;
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