Visualizing `uniq -c` result

c2g.rb

#!/usr/bin/env ruby

require 'optparse'

bar_string = "|"
bar_max = 30
max = 0

$es_s=["\033[34m","\033[36m","\033[32m","\033[33m","\033[35m","\033[31m"]
$es_b="\033[30m"
$es_e="\033[0m"
$es_u="\033[04m"

prog = File.basename($0, '.*')
usage = <<"EOS"

    #{$es_s[0]}#{prog}#{$es_e} - Visualizing `#{$es_s[1]}uniq -c#{$es_e}` result

    Usage:
         #{$es_s[0]}#{prog}#{$es_e} [#{$es_s[2]}-m#{$es_e} #{$es_u}#{$es_s[3]}max_bars#{$es_e}] [#{$es_s[2]}-b#{$es_e} #{$es_u}#{$es_s[3]}bar_string#{$es_e}] [#{$es_s[2]}-h#{$es_e}]
    Example:
         cut -f1 -d" " /var/log/messages | sort -n | #{$es_s[1]}uniq -c#{$es_e} | #{$es_s[4]}#{prog}#{$es_e}
         cut -f1 -d" " /var/log/messages | sort -n | #{$es_s[1]}uniq -c#{$es_e} | #{$es_s[4]}#{prog}#{$es_e} #{$es_s[2]}-m#{$es_e} #{$es_s[3]}50#{$es_e} #{$es_s[2]}-b#{$es_e} #{$es_s[3]}"+"#{$es_e}

EOS

opt = OptionParser.new
opt.on('-m VAL'){|v|
	if v.to_i > 0
		bar_max = v.to_i
	end
}
opt.on('-b VAL'){|v|
	if v.split(//).length == 1 
		bar_string = v.to_s
	end
}
opt.on('-h'){|v|
	puts usage
	exit 0 
}

begin
	opt.parse!(ARGV)
rescue
	puts prog+": Option invalid."
	puts usage
	exit 1
end

lines = []
begin
	while l = $stdin.gets
		$line = l.scan(/^(\s*)([0-9]+) (.*)$/)
		$spacer = $line[0][0]
		$var = $line[0][1].to_i
		$text = $line[0][2]
	
		lines.push({"spacer"=>$spacer,"var"=>$var,"text"=>$text})
	
		if ($var > max)
			max = $var
		end
	end
rescue
	puts prog+": invalid string." 
	exit 1
end

lines.each do |line|
	$p = line['var'] * 5 / max

	print "#{line['spacer']}"+$es_s[$p]+"#{line['var']}"+$es_e+" "+$es_b+"["+$es_e+$es_s[$p]
	$bar_count = bar_max * line['var'] / max
	$bar_count.times do |i|
		print bar_string
	end
	$bar_count.upto(bar_max) do |i|
		print " "
	end
	print $es_e+$es_b+"] "+$es_e+"#{line['text']}\n"
end