#!/usr/bin/env bash
set -e

KEY=$1
OUTPUT=${2:-qr.private.pdf}
SINGLE_SIZE=${3:-1024}

gpg2 --export-secret-key "$KEY" | paperkey --output-type raw | base64 | split -b "$SINGLE_SIZE"

index=1
for i in x*; do
    qrencode --8bit --level=M -o "qr.$index.png" < "$i"
    let index=index+1
done

montage -title "private key for $KEY" -label "%t" -mode concatenate $(find . -name  "qr.*.png" | sort -V) "$OUTPUT"

function finish {
    rm -f x*
    rm -f qr.*.png
}

trap finish EXIT