#!/usr/bin/env bash

# Helper for encrypting/decrypting folders with gpg and tar.
# Usage:
#   clump foldername               # packs
#   clump foldername.clump         # unpacks

set -e
if (($# == 0)); then
    >&2 echo "Usage: $0 <FILE|DIRECTORY> [DEST]"
    exit 1
fi

ext='clump'
target="$1"
cmd=
if [[ -f $target ]]; then
    cmd=unpack
elif [[ -d $target ]]; then
    cmd=pack
else
    >&2 echo "Not a valid target: '$target'"
    exit 1
fi

case $cmd in
    p|pack)
        if [[ -f $target.$ext ]]; then
            >&2 echo "Destination file already exists"
            exit 2
        fi
        tar -pcvf - "$target" | gpg -c > "$target.$ext"
        echo "Packed into $target.$ext"
        ;;
    u|unpack)
        tmpfile=$(mktemp)
        gpg -d "$target" > "$tmpfile" && tar -pxvf "$tmpfile"
        rm -f "$tmpfile"
        ;;
esac