up: Quickly cd up a directory tree

up.sh

# inspired by `bd`: https://github.com/vigneshwaranr/bd
function _up() {
	local rx updir
	rx=$(ruby -e "print '$1'.gsub(/\s+/,'').split('').join('.*?')")
	updir=`echo $PWD | ruby -e "print STDIN.read.sub(/(.*\/${rx}[^\/]*\/).*/i,'\1')"`
	echo -n "$updir"
}

function up() {
	if [ $# -eq 0 ]; then
		echo "up: traverses up the current working directory to first match and cds to it"
		echo "You need an argument"
	else
		cd $(_up "$@")
	fi
}