use List::Util qw( min max sum );
use open qw( :std :utf8 );
-our $VERSION = '1.01';
+our $VERSION = '1.02';
use Getopt::Long '2.33', qw( :config gnu_getopt );
sub podexit { require Pod::Usage; Pod::Usage::pod2usage(-exitval => 0, @_) }
GetOptions(\my %opt,
'color|c!',
+ 'follow|f:i',
'trim|length|l=i',
'markers|m=s',
'width|w=i',
'usage|h' => sub { podexit() },
'help' => sub { podexit(-verbose => 2) },
) or exit 64; # EX_USAGE
+
$opt{width} ||= $ENV{COLUMNS} || 80;
-$opt{color} //= 1;
+$opt{color} //= -t *STDOUT; # enable on tty
+
+if (defined $opt{follow}) {
+ $opt{follow} ||= 1;
+ $SIG{ALRM} = sub {
+ show_lines();
+ alarm $opt{follow};
+ };
+ alarm $opt{follow};
+}
my (@lines, @values);
while (readline) {
}
@lines or exit;
+sub show_lines {
+
my @order = sort { $b <=> $a } grep { length } @values;
my $maxval = $order[0];
my $minval = min $order[-1], 0;
my @barmark;
if ($opt{markers} // 1 and $size > 0) {
- sub orderpos { (($order[$_[0]] + $order[$_[0] + .5]) / 2 - $minval) * $size }
+ my sub orderpos { (($order[$_[0]] + $order[$_[0] + .5]) / 2 - $minval) * $size }
$barmark[ (sum(@order) / @order - $minval) * $size ] = '='; # average
$barmark[ orderpos($#order * .31731) ] = '>';
$barmark[ orderpos($#order * .68269) ] = '<';
defined and $opt{color} and $_ = "\e[36m$_\e[0m" for @barmark;
}
-for my $nr (0 .. $#lines) {
+state $nr = 0;
+while ($nr <= $#lines) {
my $val = $values[$nr];
if (length $val) {
my $color = !$opt{color} ? 0 :
printf '%-*s', $len, $lines[$nr];
print $barmark[$_] // '-' for 1 .. $size && (($val || 0) - $minval) * $size;
say '';
+ $nr++;
+}
+
}
+show_lines();
__END__
=over
-=item --no-color
+=item -c, --[no-]color
-Disable colored output of values and bar markers.
+Force colored output of values and bar markers.
+Defaults on if output is a tty,
+disabled otherwise such as when piped or redirected.
+
+=item -f, --follow[=<seconds>]
+
+Interval to output partial progress.
=item -l, --length=[-]<size>
git shortlog -sn | graph | head -3
+Latency history:
+
+ ping google.com |
+ perl -pe '$|=1; print s/ time=(.*)// ? "$1 for " : "> "' | graph -f
+
=head1 AUTHOR
Mischa POSLAWSKY <perl@shiar.org>