tagfs_nofs()
{
	echo "No tagfs filesystem found in `pwd`"
}

tagfs_exists()
{
	[ -d .tagfs ] && return 1 || return 0
}

tagfs_clear_filter()
{
	rm .tagfs/filters/$$ 2> /dev/null
	return 0
}

tagfs_list_filter()
{
	cat .tagfs/filters/$$ 2> /dev/null
	return 0
}

tagfs_list_tags()
{
	/bin/ls -1 .tagfs/tags/
}

tagfs_is_tag()
{
	[ -n "$(echo $1 | egrep '^[-+]')" ] && return 1 || return 0
}

filter()
{
	tagfs_exists
	[ $? -eq 0 ] && tagfs_nofs && return
	[ $# -eq 1 ] && [ "$1" = "-" ] && tagfs_clear_filter && return

	filter_file=".tagfs/filters/$$"
	tmp_file=".tagfs/filters/tmp_$$"
	for t in "$@"; do
		case "$(echo $t | cut -b1)" in
		+) [ -z "$(fgrep $t $filter_file 2> /dev/null)" ] && echo "${t#+}" >> $filter_file ;;
		-) sed -e "/${t#-}/d" $filter_file > $tmp_file && mv $tmp_file $filter_file 
		echo nigga;;
		esac
	done
	
	tagfs_list_filter
}

tags()
{
	tagfs_exists
	[ $? -eq 0 ] && tagfs_nofs && return
	[ $# -eq 0 ] && tagfs_list_tags && return

	tagfs_is_tag "$1"
	if [ $? -eq 1 ]; then
		for tag in "$@"; do
			[ "$tag" = "-" ] && continue
			
			case "$(echo $tag | cut -b1)" in
			+) mkdir .tagfs/tags/${tag#+} ;;
			-) rm -r .tagfs/tags/${tag#-} ;;
			esac
		done
	else
		for tag in "$@"; do
			[ "$tag" = "$1" ] && continue
			[ "$tag" = "-" ] && rm $(find -name "$1") && continue

			case "$(echo $tag | cut -b1)" in
			+) ln -s ../../../"$1" .tagfs/tags/"${tag#+}"/"$1" ;;
			-) rm .tagfs/tags/"${tag#-}"/"$1" ;;
			esac
		done
	fi
}

# Bash completion
# _filter_completion()
# {
# 	filter_file=".tagfs/filters/$$"
# 	list=""
# 	
# 	for t in $(cat $filter_file 2> /dev/null); do
# 		list+="-$t "
# 	done
# 
# 	for t in $(ls .tagfs/tags/); do
# 		[ -n "$(fgrep $t $filter_file 2> /dev/null)" ] && continue
# 		list+="+$(basename $t) "
# 	done
# 
# 	COMPREPLY=($(compgen -W "$list" -- "${COMP_WORDS[$COMP_CWORD]}"))
# }
# 
# complete -F _filter_completion filter
#