zimfw/modules/prompt/functions/short_pwd

# shortens the pwd for use in prompt

local current_dir="${1:-${PWD}}"
local return_dir='~'

current_dir="${current_dir/#${HOME}/~}"

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

print ${return_dir}