#!/bin/bash

comm="new" # decompress only new files

if [[ $# -eq 1 ]]; then
	comm="$1"
fi 

echo $comm

source_filenames=$( ls *.tar.xz )

for source_filename in ${source_filenames[@]}; do
	target_filename=$(basename $source_filename) 
	target_filename="${target_filename%.*}" # remove .xz extension
	target_filename=$(basename $target_filename)
	target_filename="${target_filename%.*}" # remove .tar extension
	if [ "$comm" == "all" ] || [ ! -f $target_filename ]; then
		echo "Decompressing ${source_filename}"
		tar -xJf "${source_filename}" 
	else
		echo "Skipping decompression of ${source_filename}"
	fi
done