Pagination task for an rdoc tutorial

Rakefile

desc "Setup pagination links for tutorial"
task :paginate_tutorial do
  pages = Dir.glob File.expand_path('../Tutorial/*', __FILE__)
  pages.each_with_index do |page, index|
    content = File.read(page)
    content.gsub!(/^(Previous|Next)\[link:.*\]$/, '').strip!
    
    previous_page = pages[index - 1]
    next_page = pages[index + 1] || pages[0]
    
    links =  "Previous[link:files/Tutorial/#{File.basename(previous_page).gsub(/\s/, '%20')}.html]\n"
    links += "Next[link:files/Tutorial/#{File.basename(next_page).gsub(/\s/, '%20')}.html]\n"
    
    File.open(page, 'w') do |io|
      io.puts links
      io.puts
      io.puts content
      io.puts
      io.puts links
    end
  end
end