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28 lines
657 B
Bash
28 lines
657 B
Bash
#!/bin/sh
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# Initialize variables
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input="$1"
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inputMul4="/tmp/${input%.pdf}-Mul4.pdf"
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outputImpaginato="${input%.pdf}-Impaginato.pdf"
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empty="/tmp/empty.pdf"
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n="$(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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