arch2xz

### Re-compress any archive to tar.xz with maximum compression level ###

### ACCEPTS THESE ARCHIVES ###
# tar, gzip, bzip2, xz, zip, 7zip, rar

### USAGE ###
# arch2xz filename1.tar.gz filename2.tar.bz2 filename3.zip ...etc...

### NOTE ###
# you can feed the function with INPUT files ONLY
# you CAN NOT specify the output files
# output files have the same filename as their input counterpart, only the extension is different


function arch2xz () {
    if [[ -z $1 ]]; then
        echo "arch2xz <file> <file>..."
        echo ""
        echo "Accepted compression formats: tar, gzip, bzip2, xz, zip, 7zip, rar"
        echo ""
        echo "NOTE: p7zip is required to handle 7zip and rar files"
        return 1;
    fi
    archives=("$@")
    for i in "${archives[@]}"
    do
    if [ -f $i ] ; then
            case $i in
                    *.tar.bz2) bzip2 -c -v -d $i | xz -c -9 -C crc64 &> ${i%%.*}.tar.xz ;;
                    *.tar.gz) gzip -c -v -d $i | xz -c -9 -C crc64 &> ${i%%.*}.tar.xz ;;
                    *.tar.xz) xz -c -v -d $i | xz -c -9 -C crc64 &> ${i%%.*}.new.tar.xz ;;
                    *.bz2) bzip2 -c -v -d $i | xz -c -9 -C crc64 &> ${i%%.*}.tar.xz ;;
                    *.gz) gzip -c -v -d $i | xz -c -9 -C crc64 &> ${i%%.*}.tar.xz ;;
                    *.tar) xz -9 -C crc64 $i ;;
                    *.tbz2) bzip2 -c -v -d $i | xz -c -9 -C crc64 &> ${i%%.*}.tar.xz ;;
                    *.tgz) gzip -c -v -d $i | xz -c -9 -C crc64 &> ${i%%.*}.tar.xz ;;
                    *.zip) unzip $i -d ${i%%.*} && cd ${i%%.*} && tar cvfp - * | xz -c -9 -C crc64 &> ../${i%%.*}.tar.xz && cd .. && rm -rf ${i%%.*} ;;
                    *.7z) mkdir ${i%%.*} && 7za x -o${i%%.*} $i && cd ${i%%.*} && tar cvfp - * | xz -c -9 -C crc64 &> ../${i%%.*}.tar.xz && cd .. && rm -rf ${i%%.*} ;;
                    *.rar) mkdir ${i%%.*} && 7za x -o${i%%.*} $i && cd ${i%%.*} && tar cvfp - * | xz -c -9 -C crc64 &> ../${i%%.*}.tar.xz && cd .. && rm -rf ${i%%.*} ;;
                    *.xz) xz -c -v -d $i | xz -c -9 -C crc64 &> ${i%%.*}.tar.xz ;;
                    *) echo "\`$i': unrecognized file compression" ;;
            esac
    else
            echo "\`$i' is not a valid file"
    fi
    done
}