#!/bin/bash
set +x
pandoc --listings doc.md -o doc.tex
pdflatex -interaction=nonstopmode main.tex

#calculate pages to extract first and last for cover
pages=$(pdfinfo main.pdf | awk '/^Pages:/ {print $2}')

# split cover from guts to add correct signature
pdfjam main.pdf 1,$((pages)) -o cover.pdf
pdfjam main.pdf 2-$((pages-1)) -o guts.pdf

# # insert blank pages after front cover and before back cover
pdfjam cover.pdf '1,{},{},2' --outfile cover.pdf

# calculate pages for guts signature length
pages="$(pdfinfo guts.pdf | awk '/^Pages:/ {print $2}')"
rem=$((pages%4))
extra=$((4-rem%4))
sig=$((pages+extra))

# booklet print
pdfbook2 -n cover.pdf
pdfbook2 -n --signature="$sig" guts.pdf
# pdfbook2 -n --short-edge cover.pdf
# pdfbook2 -n --signature="$sig" --short-edge guts.pdf

# put them back together!
pdfunite cover-book.pdf guts-book.pdf print-zine.pdf
mv main.pdf read-zine.pdf

# directory cleanup
mv -t .build ./*.aux ./*.log ./*.out doc.tex cover.pdf guts.pdf cover-book.pdf guts-book.pdf