#!/usr/bin/env zsh

_printhelp ()
{
    cat<<EOF
Usage: ${1##*/} [-p] [-f] [-i INPUTPATH] [-o OUTPUTPATH]

Extract password-protected 7z archives in one run. 7z archives are found in all
subfolders.

If password is provided, it will be used on all archives. Password will not show
up on screen. This requires a shell with 'read -s' support. It will not work for
the Bourne Shell.

Synopsis.

  -i:  Specify input folder (default to PWD).
  -f:  Remove archive if extraction was succesful.
  -o:  Specify ouput folder (default to PWD).
  -p:  Ask for password.

EOF
}

OPT_DELAFTER=false
PASS=''
INPUTPATH="$PWD"
OUTPUTPATH="$PWD"

while getopts ":hi:o:fp" opt; do
    case $opt in
        h) _printhelp "$0"
            return 1 ;;
        i) INPUTPATH="$OPTARG" ;;
        o) OUTPUTPATH="$OPTARG" ;;
        f) OPT_DELAFTER=true ;;
        p)
            echo -n "Password: "
            read -s PASS ;;
        ?)
            _printhelp "$0"
            return 1
            ;;
        :)
            _printhelp "$0"
            return 1
            ;;
    esac
done

shift $(($OPTIND - 1))

if [ $# -ne 0 ]; then
    _printhelp "$0"
    return 1
fi

if [ -z "$(command -v 7z)" ]; then
    echo "7z needed."
    exit
fi

while read -r FILE; do
    [ -z "$(file "$FILE" | grep '7-zip')" ] && continue

    echo "================================================================================"
	echo "Decompressing $FILE"

    ## We remove SOURCEFOLDER from the FILE path.
	DESTFOLDER="$(echo "$FILE" | sed "s|$INPUTPATH||")"
	DESTFOLDER="$(echo "${DESTFOLDER%/*}")"

    mkdir -p "$OUTPUTPATH/$DESTFOLDER"
	7z x -p"$PASS" "$FILE" -o"$OUTPUTPATH/$DESTFOLDER" -y

	[ $? -eq 0 ] && $OPT_DELAFTER && rm -v "$FILE"
done <<EOF
$(find "$INPUTPATH" -type f)
EOF