pdfbook2_chunks.sh

#!/bin/sh
set -e

tr=tr
if hash gtr 2> /dev/null; then
    tr=gtr
fi

if [ "$1" = -2 ]; then
    shift
    section_length=${2:-16}
    extra_opts="--nup 1x2"
else
    section_length=${2:-8}
    extra_opts=""
fi

papertype=a4paper
dir=".built_$($tr -dc A-Za-z0-9_ < /dev/urandom | head -c 6)"

mkdir "$dir"

docname="${1##*/}"
docname="${docname%.*}"
pages="$(pdfinfo "$1" | grep 'Pages:' | sed 's/[^0-9]//g')"
section=1
section_start=1
section_end=0

while [ $section_start -le $pages ]; do
    section_end=$((section_end + section_length))
    section_end=$((section_end > pages ? pages : section_end))
    f="$dir/$docname.$(printf '%04d' "$section").pdf"
    pdfjam --no-tidy $extra_opts "$1" "$section_start-$section_end" -o "$f" # <------------ was: no NUP
    pdfbook2 "--paper=$papertype" --inner-margin=170 --outer-margin=5 "$f"
    section_start=$((section_start + section_length))
    section=$((section + 1))
done

pdfjam --no-tidy $dir/*-book.pdf --landscape --rotateoversize false -o "${docname}-bound.pdf"

rm -r "$dir"