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#!/bin/sh
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usage() {
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_name="$(basename "$0")"
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cat << EOF
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Utilizzo: ${_name} [nomePDF]
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Esempi:
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${_name} MeccanicaRazionale.pdf
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Per bug contattare f.minnocci@studenti.unipi.it
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I ringraziamenti per l'idea originale vanno a http://poisson.phc.dm.unipi.it/~dilillo
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EOF
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exit $1
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}
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main() {
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# Initialize variables
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input="$(realpath "$1")"
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basename="$(basename "$1")"
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inputMul4="/tmp/${basename%.pdf}-Mul4.pdf"
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outputImpaginato="${basename%.pdf}-Impaginato.pdf"
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empty="/tmp/empty.pdf"
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echo "$input $basename $inputMul4 $outputImpaginato" > ~/log
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n="$(pdftk "$input" dump_data | grep NumberOfPages | cut -d' ' -f2)"
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# Add empty pages
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echo .bp | groff -T pdf > "$empty"
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pdftk F="$input" E="$empty" cat F1-$n $(for x in $(seq 1 $((4-n%4))); do printf 'E1 '; done) output "$inputMul4"
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# Generate alternating page ranges
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n=$((n+(4-n%4)))
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range=
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k=1
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while [ "$k" -lt $((n/2)) ]; do
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range="$range$k $((n/2+k)) $((n/2+k+1)) $((k+1)) "
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k=$((k+2))
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done
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# Output final pdf
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pdftk "$inputMul4" cat $range output "$outputImpaginato"
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rm "$empty" "$inputMul4"
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}
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if [ -z "$1" ] ; then
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printf "Non hai specificato nessun file...\n\n" && usage 1
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else
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case "$1" in
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-h|--help)
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usage 0 ;;
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-*)
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error "Opzione invalida: $1" ;;
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*)
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main "$@" ;;
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esac
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fi
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