xzz

#!/bin/bash

# `xzz <file-or-directory>`

# 0=true
# 1=false

_chkHelp() {
    case "${1}" in        
        -[hH] | --[hH] | -[hH][eE][lL][pP] | --[hH][eE][lL][pP])
            _help;
            ;;
        *)
            return
            ;;
    esac;
}

_help() {
    local -a Usage=( 
        "Usage:"
        "  xzz <file/directory>..."
    );
    local m;
    for m in "${Usage[@]}"; do
        echo "${m}";
    done;
    exit;
}

_tar() {
    _bakTar "${1}";

    echo "tar -cf ${1}.tar ${1}";
    tar -cf "${1}.tar" "${1}";
}

_bakTar() {
    local t="${1}.tar";

    if ! [ -e "${t}" ]; then
        return;
    fi;

    BAK="${t}.bak";

    cp "${t}" "${BAK}";
}

_yN() {
    case "${1}" in
        [yY] | [yY][eE][sS] )
            echo 1;
            ;;
        *)
            echo 0;
            ;;
    esac;
}

_xz() {
    local cmd="xz -zv -T 0 -e9 \"${1}\"";
    
    echo "${cmd}";
    if ! eval "${cmd}"; then
        exit 1;
    fi;

    if ! xz -t "${1}.xz"; then
       rm "${1}.xz";
        _xz "${1}";
    fi;
}

_chkHelp "${1}";

declare BAK;
for file; do
    BAK="";

    if [[ "${file}" == "${file%\.tar*}" ]]; then
        _tar "${file}" ;
        file="${file}.tar";
    fi;

    _xz "${file}";

    if ! [ "${BAK}" ]; then
        continue;
    fi;
    mv "${BAK}" "${file}";
done;