#!/usr/bin/env zsh
## We need zsh because of array use here.

_printhelp()
{
    cat <<EOF
Usage: ${1##*/} [-m METHOD] [-v] FILES|FOLDERS

Create an archive from a single or multiples files/folders.

  -h:  Display this help.
  -m:  Choose compression method.
         * gz:  gzip (default).
         * xz:  LZMA.
  -v:  Exclude VCS data. (GNU tar only.)
EOF
}

OPTION_VCS=""
OPTION_METHOD=""

while getopts ":hm:v" opt; do
    case $opt in
        h)
            _printhelp "$0"
            exit 1
            ;;
        m)
            OPTION_METHOD="${OPTARG}"
            ;;
        v)
            OPTION_VCS="--exclude-vcs"
            ;;
        ?)
            _printhelp "$0"
            exit 1
            ;;
        :)
            echo "Missing argument."
            _printhelp "$0"
            exit 1
            ;;
    esac
done

ARCEXT=""
ARCOPT=""

case $OPTION_METHOD in
    "gz")
        ARCEXT="tar.gz"
        ARCOPT="z"
        ;;
    "xz")
        ARCEXT="tar.xz"
        ARCOPT="J"
        ;;
    *)
        ARCEXT="tar.gz"
        ARCOPT="z"
        ;;
esac

shift $(($OPTIND - 1))

ARCPATH=""
ARCSOURCE=""
ARCNAME=""

if [ $# -eq 1 ]; then
    ARCPATH="$(dirname $(readlink -f "$1"))"
    ARCSOURCE="$(basename $(readlink -f "$1"))"
    ARCNAME="${ARCSOURCE}-$(date +%y-%m-%d-%H%M%S).${ARCEXT}"

    (cd "$ARCPATH" && \
        tar -${ARCOPT} -cf "$ARCNAME" "$ARCSOURCE" ${OPTION_VCS})

else
    ARCSOURCE="$(basename $PWD)"
    ARCNAME="$(basename "$ARCSOURCE")-$(date +%y-%m-%d-%H%M%S).${ARCEXT}"

    if [ $# = 0 ];then

        (cd "$PWD/.." && \
            tar -${ARCOPT} -cf "$ARCNAME" "$ARCSOURCE" ${OPTION_VCS})

    else
        ## Note for zsh: do NOT initialize an array with "myarray=()".

        for i; do
            FILELIST=(${FILELIST[*]} "$i")
        done

        tar -${ARCOPT} -cf "$ARCNAME" ${FILELIST[*]} ${OPTION_VCS}
    fi
fi