2008 era image optimizer script

grind.rb

#!/usr/bin/env ruby

# Copyright (c) 2008 Chris Griego
# 
# Grinder is freely distributable under the terms of an MIT-style license.
# For details, see http://www.opensource.org/licenses/mit-license.php

require 'rubygems'
require 'mime/types'

file      = ARGV[0]
file_name = File.basename(file, File.extname(file))
type      = MIME::Types.type_for(file)[0].sub_type.to_sym
files     = [{ :file => file, :method => 'original' }]
methods   = ['original']

if type == :gif
  methods << 'pngout'
  `pngout #{file} #{file_name}-pngout.png`
  files << { :file => "#{file_name}-pngout.png", :method => methods.last }
  
  methods << 'pngout+optipng'
  `cp #{file_name}-pngout.png #{file_name}-pngout-optipng.png`
  `optipng -o7 #{file_name}-pngout-optipng.png`
  files << { :file => "#{file_name}-pngout-optipng.png", :method => methods.last }
  
  methods << 'optipng'
  `cp #{file} #{file_name}-optipng.gif`
  `optipng -o7 #{file_name}-optipng.gif`
  `rm #{file_name}-optipng.gif`
  files << { :file => "#{file_name}-optipng.png", :method => methods.last }
  
  methods << 'optipng+pngout'
  `pngout #{file_name}-optipng.png #{file_name}-optipng-pngout.png`
  files << { :file => "#{file_name}-optipng-pngout.png", :method => methods.last }
elsif type == :png
  methods << 'pngout'
  `pngout #{file} #{file_name}-pngout.png`
  files << { :file => "#{file_name}-pngout.png", :method => methods.last }
  
  methods << 'pngout+optipng'
  `cp #{file_name}-pngout.png #{file_name}-pngout-optipng.png`
  `optipng -o7 #{file_name}-pngout-optipng.png`
  files << { :file => "#{file_name}-pngout-optipng.png", :method => methods.last }
  
  methods << 'optipng'
  `cp #{file} #{file_name}-optipng.png`
  `optipng -o7 #{file_name}-optipng.png`
  files << { :file => "#{file_name}-optipng.png", :method => methods.last }
  
  methods << 'optipng+pngout'
  `pngout #{file_name}-optipng.png #{file_name}-optipng-pngout.png`
  files << { :file => "#{file_name}-optipng-pngout.png", :method => methods.last }
end

files.map! {|f| f[:size] = File.size(f[:file]); f }

files.sort!   {|a,b| a[:size] <=> b[:size] }

digits = files.last[:size].to_s.length
files.each {|f| puts "#{f[:size].to_s.rjust(digits)} #{f[:method]}" }

new_file = files[0]
`cp #{new_file[:file]} #{file_name + '-new' + File.extname(new_file[:file])}`
files.each {|f| `rm #{f[:file]}`}
`mv #{file_name + '-new' + File.extname(new_file[:file])} #{file_name + File.extname(new_file[:file])}`
puts "#{file_name + File.extname(new_file[:file])}"