# shortens the pwd for use in prompt

local current_dir="${${1:-${PWD}}/#${HOME}/~}"

# if we aren't in ~
if [[ ${current_dir} != '~' ]]; then
  current_dir="${${${${(@j:/:M)${(@s:/:)current_dir}##.#?}:h}%/}//\%/%%}/${${current_dir:t}//\%/%%}"
fi

print ${current_dir}