Capistrano select branch/tag to deploy

cap_set_branch.rb

set :branch do
  tags = `git tag`.split("\n")
  list = tags.collect {|x| %(#{tags.index(x)}: #{x}) }
  puts %(------------------------------------------
    Available Tags for Deployment
    Use m for master
------------------------------------------) 
     puts list << "------------------------------------------\n"
  i = Capistrano::CLI.ui.ask('Tag to deploy:')
  i == 'm' ? 'master' : tags[i.to_i]
end