namespace :gems do
  namespace :downloads do
    desc 'Print list of Gem downloads from rubyforge.org'
    task :list do
      require "rubygems"
      require "open-uri"
      require "hpricot"
      def print_gems
        content = ""
        open("http://gems.rubyforge.org/stats.html").each do |line|
          content << line
        end
        doc = Hpricot(content)

        rows = []
        doc.search("table/tr").each do |row|
          rows << row.search("/").collect {|e| e.inner_html}
        end

        max_lengths = get_max_lengths(rows)

        print_dashes max_lengths
        print_row rows[0], max_lengths
        print_dashes max_lengths
        rows[1..-1].each do |row|
          print_row(row, max_lengths)
        end
        print_dashes max_lengths
      end

      def get_max_lengths(rows)
        max_lengths = [0, 0]
        rows.inject(max_lengths) do |max_lengths, row|
          max_lengths[0] = row[0].length if row[0].length > max_lengths[0]
          max_lengths[1] = row[1].length if row[1].length > max_lengths[1]
          max_lengths
        end
        max_lengths
      end

      def print_dashes(max_lengths)
        puts '-' * (max_lengths[0] + max_lengths[1] + 7)
      end

      def print_row(row, max_lengths)
        printf("| %#{max_lengths[0]}s | %#{max_lengths[1]}s |", row[0], row[1])
        puts
      end
      print_gems      
    end
  end
end