#!/bin/sh

DATE=

_printhelp ()
{
    cat<<EOF
Usage: ${1##*/} [-f]

Create index of folder hierarchies. This is used as a small "backup" purpose. In
case of data loss, it is still possible to get the full file list thanks to the
indexes.

 -f: overwrite if output exists
EOF
}

OPT_NOCLOBBER=true
while getopts ":dfh" opt; do
    case $opt in
        h)
            _printhelp "$0"
            exit 0
            ;;
        f)
            OPT_NOCLOBBER=false
            ;;
        ?)
            _printhelp "$0"
            exit 1
            ;;
        :)
            _printhelp "$0"
            exit 1
            ;;
    esac
done

shift $(($OPTIND - 1))

if [ $# -eq 0 ]; then
    _printhelp "$0"
    exit 1
fi

for i ; do
    i="$(realpath "$i")"
    [ ! -d "$i" ] && continue
    OUTPUT="${i##*/}.index"
    [ -e "$OUTPUT" ] && $OPT_NOCLOBBER && OUTPUT="${i##*/}-$(date +%F-%T).index"
    echo "$OUTPUT"
    find "$i" -type f | sort > "$OUTPUT"
    echo "## $(date +%F)" >> "$OUTPUT"
done