#!/usr/bin/env perl
use 5.014;
use warnings;
-use List::Util qw( max );
+use List::Util qw( max sum );
-my $width = $ENV{COLUMNS} || 80;
+our $VERSION = '1.00';
-my @lines = readline;
+use Getopt::Long '2.33';
+GetOptions(\my %opt,
+ 'width|w=i',
+) or exit 64; # EX_USAGE
+$opt{width} ||= $ENV{COLUMNS} || 80;
+
+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 $lenval = 1 + int log($order[0]) / log 10; # max string length
my $len = 1 + max map { length } @lines; # left padding
-my $size = ($width - $lenval - $len) / $order[0]; # bar multiplication
+my $size = ($opt{width} - $lenval - $len) / $order[0]; # bar multiplication
sub orderpos { ($order[$_[0]] + $order[$_[0] + .5]) / 2 * $size }
my @barmark;
+$barmark[ sum(@values) / @values * $size ] = '='; # average
$barmark[ orderpos($#order / 2) ] = '+'; # mean
defined and $_ = "\e[36m$_\e[0m" for @barmark;
print $barmark[$_] // '-' for 1 .. $val * $size;
say '';
}
+
+__END__
+
+=head1 NAME
+
+graph - append bar chart to input numbers
+
+=head1 SYNOPSIS
+
+B<graph> [<options>] [<input>]
+
+cat ... | uniq -c | graph
+
+=head1 DESCRIPTION
+
+Each line starting with a number is given a bar to visualise relative sizes.
+
+=head1 OPTIONS
+
+=over
+
+=item -w, --width=<columns>
+
+Override the maximum number of columns to use.
+Appended graphics will extend to fill up the entire screen.
+
+=back
+
+=head1 AUTHOR
+
+Mischa POSLAWSKY <perl@shiar.org>
+
+=head1 LICENSE
+
+GPL3+.