001: Parse and add a CSS class to every html file in a folder

# This ruby script loads all .html files in the folder above, check for a class 
# on the body, generate a class from the filename ( i.e. 019-5028dca6d8bd8861270001b1.html ),
# adds a class ( i.e. .page19 ) to the body and writes that back to the file.
 
require 'rubygems'
require 'nokogiri'
require 'open-uri'
 
module ClassMutator
  def add_css_class( *classes )
    existing = (self['class'] || "").split(/\s+/)
    self['class'] = existing.concat(classes).uniq.join(" ")
  end
end
 
Dir.glob("../*.html") do |file|
 
  @myfile = File.open(file, 'r');
  @baseName = File.basename(file)
 
  # we want classes like .page123 
  # - Strip down basename
  # - Remove leading zeros and add 'page'
  @pageNumber = "page" + ((@baseName[0..@baseName.index('-')-1]).to_i.to_s) 
 
  @page = Nokogiri::HTML(@myfile)   
  @anchor = @page.css("body").first
 
  if @page.at_css("body.#{@pageNumber}")
      # Page has class already
      # ~ Moving on
  else
      # Add class to existing classes
      @anchor.extend ClassMutator
      @anchor.add_css_class @pageNumber
      # Write it back to the file
      File.open(file, 'w') do |file|
        file.puts @page.to_html 
      end
  end  
 
end