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#!/bin/sh
# Initialize variables
input="$1"
inputMul4="/tmp/${input%.pdf}-Mul4.pdf"
outputImpaginato="${input%.pdf}-Impaginato.pdf"
empty="/tmp/empty.pdf"
n="$(pdftk "$input" dump_data | grep NumberOfPages | cut -d' ' -f2)"
# Add empty pages
echo .bp | groff -T pdf > "$empty"
pdftk F="$input" E="$empty" cat F1-$n "$(for x in $(seq 1 $((4-n%4))); do printf 'E1 '; done)" output "$inputMul4"
# Generate alternating page ranges
n=$((n+(4-n%4)))
range=
k=1
while [ "$k" -lt $((n/2)) ]; do
range="$range$k $((n/2+k)) $((n/2+k+1)) $((k+1)) "
k=$((k+2))
done
# Output final pdf
pdftk $inputMul4 cat $range output $outputImpaginato
rm "$empty" $inputMul4