generate pdf file from online wordpress function reference

require 'rubygems'
require 'anemone'
load 'global.rb' # contains the skip_links_like regex

# get all the html files that we need
Anemone.crawl("http://codex.wordpress.org/Function_Reference/") do |anemone|
  anemone.skip_links_like $regex
  anemone.on_pages_like /http\:\/\/codex.wordpress.org\/Function_Reference\// do |page|
    puts page.url
    matched = page.url.to_s.match /http\:\/\/codex.wordpress.org\/Function_Reference\/([_a-zA-Z0-9]+)$/
    if matched
      filename = matched[1]
      puts filename
      doc = Nokogiri::HTML(page.body)
      doc.css('#bodyContent').each do |body|
        File.open("output/#{filename}.html", 'w') {|f| f.write(body) }
      end
    end
  end
end

# now create one big HTML file
files = Dir.glob 'output/*.html'
files.each do |file|
  File.open('bigfile.html', 'a') {|f| f << File.read(file) }
end

# now create the PDF file from this big HTML file
`wkhtmltopdf bigfile.html wordpress_function_reference.pdf --encoding UTF8 --page-size Letter`