Using Ruby in a Bash function to shorten the CWD

gistfile1.sh

function shorten_pwd {                                                                                                                                          
  ruby -e "puts Dir.pwd.sub(/^#{ENV['HOME']}/, '~').split('/').map {|l| l.length > 6 ? l[0,3] << '…' << l[-3,3] : l}.join('/')"                                 
}