FOUND_RBENV=0
 for rbenvdir in "$HOME/.rbenv" "/usr/local/rbenv" "/opt/rbenv" ; do
   if [ -d $rbenvdir/bin -a $FOUND_RBENV -eq 0 ] ; then
     FOUND_RBENV=1
     export RBENV_ROOT=$rbenvdir
     export PATH=${rbenvdir}/bin:$PATH
     eval "$(rbenv init -)"
 
     alias rubies="rbenv versions"
     alias gemsets="rbenv gemset list"
 
     function current_ruby() {
       echo "$(rbenv version-name)"
     }
 
     function current_gemset() {
       echo "$(rbenv gemset active 2&>/dev/null | sed -e ":a" -e '$ s/\n/+/gp;N;b a') | head -n1"
     }
 
     function gems {
       local rbenv_path=$(rbenv prefix)
       gem list $@ | sed \
         -Ee "s/\([0-9\.]+( .+)?\)/$fg[blue]&$reset_color/g" \
         -Ee "s|$(echo $rbenv_path)|$fg[magenta]\$rbenv_path$reset_color|g" \
         -Ee "s/$current_ruby@global/$fg[yellow]&$reset_color/g" \
         -Ee "s/$current_ruby$current_gemset$/$fg[green]&$reset_color/g"
     }
 
     function rbenv_prompt_info() {
       if [[ -n $(current_gemset) ]] ; then
         echo "$(current_ruby)@$(current_gemset)"
       else
         echo "$(current_ruby)"
       fi
     }
   fi
 done
 unset rbenvdir
 
 if [ $FOUND_RBENV -eq 0 ] ; then
   alias rubies='ruby -v'
   function gemsets() { echo 'not supported' }
   function rbenv_prompt_info() { echo "system: $(ruby -v | cut -f-2 -d ' ')" }
 fi