replace image urls with images

suck.rb

#!/usr/bin/env ruby
# suck.rb index.html will build a local.index.html with all images offline
require 'httpclient'

### UTILITIES
Dir.mkdir('images') unless File.directory?('images')
def imagepath(url)
  'images/' + url.sub('http://','').gsub('/','__')
end

def save(filename,contents)
  file = File.new(filename, "w")
  file.write(contents)
  file.close
end

def extractImages(filename)
  file = File.open(filename, "rb")
  contents = file.read
  localContents = String.new(contents)
  contents.scan(/http:\/\/\S+?\.(?:jpg|gif|png)/im) { |url|
    print '.' 
    save(imagepath(url), HTTPClient.new().get_content(url)) unless File.exists?(imagepath(url))
    localContents.gsub!(url, imagepath(url))
  }
  puts ''
  save("local."+filename, localContents)
end

### COMMAND-LINE
extractImages(ARGV[0])