Enhancement of asset-precompile speedup

gistfile1.rb

namespace :assets do
    task :precompile, :roles => :web, :except => { :no_release => true }  do
      run %Q{cd #{latest_release} && #{rake} RAILS_ENV=#{rails_env} asset_paths}
      num_paths = capture("cat #{latest_release}/tmp/asset_paths").to_i
      run %Q{rm #{latest_release}/tmp/asset_paths}
      if num_paths == 0 # 0 means, there are no gems with asset paths
        from = source.next_revision(current_revision)
        if capture("cd #{latest_release} && #{source.local.log(from)} vendor/assets/ app/assets/ | wc -l").to_i > 0
          run %Q{cd #{latest_release} && #{rake} RAILS_ENV=#{rails_env} #{asset_env} assets:precompile}
        else
          logger.info "Skipping asset pre-compilation because there were no asset changes"
        end
      else
        run %Q{cd #{latest_release} && #{rake} RAILS_ENV=#{rails_env} #{asset_env} assets:precompile}
      end
    end
  end


desc "Checks if there are any Gems with Assets, which need to be compiled"
task :asset_paths => :environment do
  file = File.new("tmp/asset_paths", "w")
  asset_paths = Rails.application.assets.paths
  file.puts(asset_paths.reject!{|x| x.start_with?(Rails.root) || x.include?('jquery-rails')}.size)
  file.close
end