theme_picker_servlet_snippet.rb

  def zip(theme, location)
    
    begin      
      FileUtils.mkdir_p(File.dirname(location))
      FileUtils.rm(location) if File.exists?(location)
      
      if RUBY_PLATFORM =~ /darwin/
        
        Dir.chdir(THEMES) do      
          system("zip -r \"#{location}\" #{theme}/ -x \"*.svn*\" -x \"*.git*\"")
        end
        
      else

        Zip::ZipFile.open(location, Zip::ZipFile::CREATE) do |zip|
          zip.mkdir(theme)
          zip.mkdir(theme + '/assets')
          zip.mkdir(theme + '/layout')
          zip.mkdir(theme + '/templates')
          zip.mkdir(theme + '/config')
          zip.mkdir(theme + '/snippets')
        
          base = THEMES + "/"
          files = []
          files += Dir["#{base}#{theme}/assets/*"]
          files += Dir["#{base}#{theme}/templates/*.liquid"]
          files += Dir["#{base}#{theme}/layout/theme.liquid"]
          files += Dir["#{base}#{theme}/README"]
          files += Dir["#{base}#{theme}/config/*"]
          files += Dir["#{base}#{theme}/snippets/*"]
        
          files.each do |file|
            position = file[base.size..-1]          
            zip.add(position, file)
          end                
        end        
      end
                  
      File.open(location, "rb") { |fp| yield fp }
              
    rescue
      FileUtils.rm(location) if File.exists?(location)
      raise
    end
  end