#!/bin/sh

#
# UNPacK script by Minoru (eual [dot] jp [at] gmail [dot] com)
#

help() {
    echo "USAGE: `basename $0` --help | file1 [file2 [file3 ...]]"
    echo "Supported archive formats is: tar, tar.bz2, tar.gz, bz2, gz, 7z, zip, rar."
}

# Check parameters
if [ "$1" == "--help" ]
then
    help
    exit
fi

if [ -z "$*" ]
then
    echo "Specify files to unpack please. See `basename $0` --help for details."
    exit 1
fi

# checking for pv
if command -v piv &>/dev/null
then
    pv_avaliable=true
else
    pv_avaliable=false
    echo "Warning: pv not found. Please install it for displaying nice progress bars, speed and estimated time while packing."
fi

while [ -n "$1" ]
do
    case $1 in
        *.tar)
            if [ $pv_avaliable == true ]
            then
                pv "$1" | tar xf -
            else
                tar xvf "$1"
            fi
            shift
            ;;


        *.tbz|*.tbz2|*.tar.bz2)
            if [ $pv_avaliable == true ]
            then
                pv "$1" | bunzip2 -c | tar xf -
            else
                tar xjvf "$1"
            fi
            shift
            ;;

    
        *.tgz|*.tar.gz)
            if [ $pv_avaliable == true ]
            then
                pv "$1" | gunzip -c | tar xf -
            else
                tar xzvf "$1"
            fi
            shift
            ;;


        *.bz2)
            out="${1%%.bz2}"
            if [ $pv_avaliable == true ]
            then
                pv "$1" | bunzip2 -c - >"$out"
            else
                bunzip2 -cv "$1" >"$out"
            fi
            shift
            ;;


        *.gz)
            out="${1%%.gz}"
            if [ $pv_avaliable == true ]
            then
                pv "$1" | gunzip -c - >"$out"
            else
                gunzip -cv "$1" >"$out"
            fi
            shift
            ;;


        *.7z|*.7zip)
            7z x "$1"
            shift
            ;;


        *.zip)
            unzip "$1"
            shift
            ;;


        *.rar)
            rar x "$1"
            shift
            ;;


        *)
            echo "Can't recognize format of '$1'. See `basename $0` --help for details."
            exit 1
            ;;
    esac
done