#!/bin/bash
RANGE_LOW=
RANGE_HIGH=
SIG=
DOC_IN=
DOC_OUT=
STRING=""
PAGE=$RANGE_LOW

echo $RANGE_LOW - $RANGE_HIGH with Signature of $SIG

ROUNDS=$((($RANGE_HIGH-$RANGE_LOW+$SIG)/$SIG))
SUB=$(($SIG/4))

echo $ROUNDS

for R in $(seq $ROUNDS); do
	OFFS=$((($R-1)*$SIG+$RANGE_LOW-1))
	for i in $(seq $SUB); do
		let t=2*i
		let tt=$SIG-$t+2+$OFFS && [[ $tt -le ${RANGE_HIGH} ]] && T1=A$tt || T1=B1
		let tt=$t-1+$OFFS && [[ $tt -le ${RANGE_HIGH} ]] && T2=A$tt || T2=B1
		let tt=$t+$OFFS && [[ $tt -le ${RANGE_HIGH} ]] && T3=A$tt || T3=B1
		let tt=$SIG-$t+1+$OFFS && [[ $tt -le ${RANGE_HIGH} ]] && T4=A$tt || T4=B1
		STRING=$STRING"$T1 $T2 $T3 $T4 "
	done
done
echo "Taking $ROUNDS Rounds, to get"
echo $STRING
# pdfnup --pages $STRING --paper a4paper --nup 2x1 --outfile "$DOC_OUT" "$DOC_IN
pdftk A=${DOC_IN} B=~/bin/empty_letter.pdf cat $STRING output ${DOC_OUT}