-my @values = map { s/^\h*([0-9]*)// and $1 } @lines;
-my @order = sort { $b <=> $a } @values;
-my $lenval = 1 + int log($order[0]) / log 10; # max string length
-my $len = 1 + max map { length } @lines; # left padding
-my $size = ($opt{width} - $lenval - $len) / $order[0]; # bar multiplication
+my @values = map { s/^\h* ( -? [0-9]* (?:\.[0-9]+)? )//x and $1 } @lines;
+my @order = sort { $b <=> $a } grep { length } @values;
+if (defined $opt{trim}) {
+ my $trimpos = abs $opt{trim};
+ $trimpos <= 1 ? ($_ = substr($_, 0, 1)) :
+ (length > $trimpos and substr($_, $trimpos - 1) = '…') for @lines;
+}
+
+my $maxval = $order[0];
+my $minval = min $order[-1], 0;
+my $lenval = max map { length } @order;
+my $len = defined $opt{trim} && $opt{trim} <= 0 ? -$opt{trim} + 1 :
+ 1 + max map { length } @lines; # left padding
+my $size = ($maxval - $minval) &&
+ ($opt{width} - $lenval - $len) / ($maxval - $minval); # bar multiplication