my @lines = readline or exit;
chomp for @lines;
-my @values = map { s/^\h*(-?[0-9]*)// and $1 } @lines;
-my @order = sort { $b <=> $a } @values;
-my $maxval = max $order[0], -$order[-1];
-my $lenval = 1 + ($order[-1] < 0) + int log($maxval || 1) / log 10; # max string length
+my @values = map { s/^\h* ( -? [0-9]* (?:\.[0-9]+)? )//x and $1 } @lines;
+my @order = sort { $b <=> $a } grep { length } @values;
+my $maxval = $order[0];
+my $minval = min $order[-1], 0;
+
+my $lenval = max map { length } @order;
my $len = 1 + max map { length } @lines; # left padding
-my $size = ($opt{width} - $lenval - $len) / $maxval; # bar multiplication
+my $size = ($maxval - $minval) &&
+ ($opt{width} - $lenval - $len) / ($maxval - $minval); # bar multiplication
-sub orderpos { ($order[$_[0]] + $order[$_[0] + .5]) / 2 * $size }
+sub orderpos { (($order[$_[0]] + $order[$_[0] + .5]) / 2 - $minval) * $size }
my @barmark;
-$barmark[ sum(@values) / @values * $size ] = '='; # average
+$barmark[ (sum(@order) / @order - $minval) * $size ] = '='; # average
$barmark[ orderpos($#order / 2) ] = '+'; # mean
+$barmark[ -$minval * $size ] = '|' if $minval < 0; # zero
defined and $opt{color} and $_ = "\e[36m$_\e[0m" for @barmark;
for my $nr (0 .. $#lines) {
my $val = $values[$nr];
- my $color = !$opt{color} ? 0 :
- $val == $order[0] ? 32 : # max
- $val == $order[-1] ? 31 : # min
- 90;
- printf "\e[%sm", $color if $color;
- printf "%*s", $lenval, $val;
- print "\e[0m" if $color;
+ if (length $val) {
+ my $color = !$opt{color} ? 0 :
+ $val == $order[0] ? 32 : # max
+ $val == $order[-1] ? 31 : # min
+ 90;
+ printf "\e[%sm", $color if $color;
+ printf "%*s", $lenval, $val;
+ print "\e[0m" if $color;
+ }
printf '%-*s', $len, $lines[$nr];
- print $barmark[$_] // '-' for 1 .. abs $val * $size;
+ print $barmark[$_] // '-' for 1 .. (($val || 0) - $minval) * $size;
say '';
}