#!/bin/bash

tags=""

tmp_list=$(head /dev/urandom | tr -dc A-Za-z0-9 | head -c 13)
tmp_list="tmp_${tmp_list}.list"
rm $tmp_list > /dev/null 2>&1

if [ $# -eq 0 ]; then
    echo >&2 ""
    echo >&2 "silentextractparallel by bcov - a tool extract a silent file in paralllel"
    echo >&2 "Usage:"
    echo >&2 "        silentextractparallel myfile.silent"
    exit 1
fi

if [ ! -f $1 ]; then
    echo >&2 "silentextractparallel: $1 doesn't exist!"
    exit 1
fi

tmp_fol=$(head /dev/urandom | tr -dc A-Za-z0-9 | head -c 13)
tmp_fol="tmp_${tmp_fol}"

cpus=64 #$(parallel --number-of-cores)

silentls $1 > $tmp_list

splitno=$((( $(wc -l $tmp_list | awk '{print $1}') / $cpus + 1)))

mkdir $tmp_fol

split -l $splitno $tmp_list $tmp_fol/x

ls $tmp_fol/x* | parallel "cat {} | silentslice $1 > {}.silent"

ls $tmp_fol/x*.silent | parallel -j $cpus 'silentextract {}'

rm $tmp_list
rm -r $tmp_fol