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#!/bin/sh
usage() {
_name="$(basename "$0")"
cat << EOF
Utilizzo: ${_name} [nomePDF]
Esempi:
${_name} MeccanicaRazionale.pdf
Per bug contattare f.minnocci@studenti.unipi.it
I ringraziamenti per l'idea originale vanno a http://poisson.phc.dm.unipi.it/~dilillo
EOF
exit $1
}
main() {
# Initialize variables
input="$(realpath "$1")"
basename="$(basename "$1")"
inputMul4="/tmp/${basename%.pdf}-Mul4.pdf"
outputImpaginato="${basename%.pdf}-Impaginato.pdf"
empty="/tmp/empty.pdf"
echo "$input $basename $inputMul4 $outputImpaginato" > ~/log
n="$(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"
}
if [ -z "$1" ] ; then
printf "Non hai specificato nessun file...\n\n" && usage 1
else
case "$1" in
-h|--help)
usage 0 ;;
-*)
error "Opzione invalida: $1" ;;
*)
main "$@" ;;
esac
fi