cdt function to change directory based on a tag filing system

cdt.bash

# In my tag-filing system where top-level "context" folders are tagged with
# "=Context" tags and subfolders are tagged with "@project" tags, this function
# lets me quickly cd to any tagged folder in my filing system. The first
# argument is a context folder, the rest are a chain of subfolders. The
# subfolders don't need to be contiguous, and the matching is fuzzy.
cdt() {
	local fuzzy
	local root
	local sub
	local list

	if [[ $# == 0 || $1 =~ ^\-?\-h(elp)?$ ]]; then
		cat <<-EOS
			$FUNCNAME changes directory based on tagged folders
			usage: $FUNCNAME context [subfolder, [subfolder...]]
		EOS
		return
	fi

	fuzzy=`echo ${1##[#=]} | sed 's/\([[:alpha:]]\)/\1*/g'`
	root=`mdfind "kMDItemUserTags = '=*$fuzzy'c && kMDItemContentType = 'public.folder'"|head -n 1`

	if [[ $2 ]]; then
		shift
		while [[ $1 ]]; do
			fuzzy=`echo $1 | tr -d "@: " | sed 's/\([[:alpha:]]\)/\1*/g'`
			sub=`mdfind -onlyin "$root" "kMDItemUserTags = '@$fuzzy'c && kMDItemContentType = 'public.folder'"|head -n 1`
			list=`ls -1F | grep -i "${fuzzy//\*/.*}.*\/$" | head -n 1`
			if [[ -n $sub ]]; then
				root=$sub
			elif [[ -d $root/$list ]]; then
				root=$list
			fi
			shift
		done
	fi

	builtin cd "$root"
}