Code challenge: Bash prompt path shortener

Question

I implemented a prompt path shortener for bash to be included in the PS1 environment variable, which shortens the working directory into something more compact but still descrip

Answer 1

This is how I shorten my bash prompt w/ full path in titlebar (works since 3.0):

_PS1P=('' '..')
PROMPT_COMMAND='_PS1L=${#DIRSTACK[0]} _PS1D=${DIRSTACK[0]}'
PS1='\[\e]2;\h:\w\a\]\h ${_PS1P[$_PS1L>36]}${_PS1D:$_PS1L>36?-34:0} \$ '

This method requires very low CPU overhead.