module CapistranoDeployManagement
  module RailsAssets
    def self.load_into(configuration)
      configuration.load do

        use_recipe :rails

        namespace :deploy do
          namespace :assets, roles: :web do
            desc 'Clear application cache (e.g. Memcached).'
            task :refresh_cache do
              run "cd #{current_path} && rake cache:clear RAILS_ENV=#{rails_env}"
              # Requires this rake task: (include here!?)
              # namespace :cache do
              #   desc 'Clear memcache'
              #   task clear: :environment do
              #     Rails.cache.clear
              #   end
              # end
            end

            desc 'Precompile assets if any assets have changed.'
            task :lazy_precompile do
              current_revision  = "cat #{current_path}/REVISION"
              head_revision     = "cat #{latest_release}/REVISION"
              assets_paths      = "#{latest_release}/app/assets/ #{latest_release}/lib/assets/ #{latest_release}/vendor/assets/"

              run "svn log -r #{current_revision}:#{head_revision} #{assets_paths}"

              # if capture("cd #{latest_release} && #{source.local.log(from)} vendor/assets/ app/assets/ | wc -l").to_i > 0
              #   run "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
            end

            # desc 'Precompile assets, but only those that are not precompiled already.'
            # task :recompile, :roles => :web, :except => { :no_release => true } do
            #   run <<-EOF
            #     export FROM=`[ -f #{current_path}/REVISION ] && (cat #{current_path}/REVISION | perl -pe 's/$/../')` &&
            #     export TO=`cat #{latest_release}/REVISION` &&
            #     echo ${FROM}${TO} &&
            #     cd #{shared_path}/cached-copy &&
            #     git log ${FROM}${TO} -- app/assets vendor/assets | wc -l | egrep '^0$' ||
            #     (
            #       echo "Recompiling assets" &&
            #       cd #{latest_release} &&
            #       source .rvmrc &&
            #       RAILS_ENV=production bundle exec rake assets:precompile --trace
            #     )
            #   EOF
            # end
          end
        end

        after   'deploy:update', 'deploy:assets:refresh_cache'

      end
    end
  end
end