#!/bin/bash

umask 0077
set -p
#set -x

prog=$(basename $0)

function bail {
        echo $@ >&2
        exit 1
}

TMP_FINGERPRINT="/tmp/tmp-$prog-$$"
TMP_PAGE="/tmp/fingerprint-page-for-$1.ps"

gpg --fingerprint "$1" > "$TMP_FINGERPRINT" \
|| bail "gpg --fingerprint $1 failed, you need to supply a valid keyid"

(echo ; echo) >> "$TMP_FINGERPRINT"

TOTAL_LINES=74 # number of lines on two letter pages

FINGERPRINT_LINES=$( wc -l < "$TMP_FINGERPRINT" )
TIMES_FIT_ON_PAGE=$(( $TOTAL_LINES / $FINGERPRINT_LINES ))

function do_one_page {
        for n in $(seq 1 $TIMES_FIT_ON_PAGE) ; do 
                cat "$TMP_FINGERPRINT"
        done
}

( 
        do_one_page
        echo  # split pages here
        do_one_page
) | a2ps -B -2 -o "$TMP_PAGE"

rm -f "$TMP_FINGERPRINT"