#!/bin/sh

if [ "$1" = "-h" ] || [ $# -lt 2 ]; then
    cat <<EOF
${0##*/} FOLDERS DEST

Move FOLDERS into DEST. Does not overwrite by default. Empty folders are ignored.

Options:
  -f: Overwrite destination.
  -r: Remove empty folders.
EOF
    exit
fi

OPT_OVERWRITE=false
OPT_DELEMPTY=false

while getopts ":fhr" opt; do
    case $opt in
        h)
            _printhelp "$0"
            exit 1 ;;
        f)
            OPT_OVERWRITE=true ;;
        r)
            OPT_DELEMPTY=true ;;
        ?)
            _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
    ARGLIST="${ARGLIST:+$ARGLIST\n}$i"
done
FOLDERS="$(echo $ARGLIST | head -n-1)"
DEST="$(echo $ARGLIST | tail -n1)"

while IFS= read -r FOLDER; do
    while IFS= read -r FILE; do
        DESTFILE="$DEST/$FILE"
        if [ ! -e "$DESTFILE" ] || $OPT_OVERWRITE; then
            mkdir -p "$(dirname "$DESTFILE")"
            mv -v "$FOLDER/../$FILE" "$DESTFILE"

            if $OPT_DELEMPTY; then
                PARENT="$FOLDER/../$FILE"
                PARENT="${PARENT%/*}"
                rmdir "$PARENT" 2>/dev/null
            fi
        fi

    ## We switch to FOLDER so that 'find' strips the parent dirs from the path.
    done <<EOF
$(cd "$FOLDER/.." && find "$(basename ${FOLDER})" \( -type f -o -type l \) )
EOF
done <<EOF
$(echo "$FOLDERS")
EOF