fish-style prompt for bash

[b4283 <da.mi.spirit@xxxxxxxxx>]

Hi,
I just finished writing a fancier prompt for bash, which showing 
directories in an abbreviated form just like the fish shell does.

function _prompt {
   _dir_abbr=$(temp=$(echo "${PWD/$HOME/~}" |sed -r 
's/(\/.)[^/]*/\1/g'); echo ${temp:0:$(( ${#temp} - 1 ))})
   _ps1="$(basename "${PWD/$HOME/~}")"
   if [ ${#_ps1} -gt 25 ]; then
       _ps1="${_ps1:0:7}...${_ps1: -7}"
   fi
   echo -n "$_dir_abbr$_ps1"
}

just quote the function in the $PS1 like this (e.g.):
PS1='$(_prompt)] '

enjoy!