#!/usr/bin/env bash
set -euf -o pipefail

case "$1" in
	*/..|*/../) cd -- "$1";; # that doesn't make any sense unless the directory already exists
	/*/../*) (cd "${1%/../*}/.." && mkdir -p "./${1##*/../}") && cd -- "$1";;
	/*) mkdir -p "$1" && cd "$1";;
	*/../*) (cd "./${1%/../*}/.." && mkdir -p "./${1##*/../}") && cd "./$1";;
	../*) (cd .. && mkdir -p "${1#.}") && cd "$1";;
	*) mkdir -p "./$1" && cd "./$1";;
esac