#! /bin/bash
#
# splitpapers -- split PDF into one file per chapter
#
# (c) 2020 Prof Dr Andreas Müller, Hochschule Rapperswil
#
if [ ! -f buch.aux ]
then
	echo "file buch.aux missing"
	exit 1
fi

if [ ! -d separata ]
then
	mkdir separata
fi

awk 'BEGIN {
	offsetpage = 12
	startpage = 0
	identifier = ""
	chapterno = 0
}
/newlabel{chapter:/ {
	s = substr($0, 19, length($0) - 19)
	i = match(s, "}{{")
	newidentifier = substr(s, 1, i-1)
	s = substr(s, i+3, length(s)-i-3)
	i = match(s, "}{")
	newchapterno = int(substr(s, 1, i))
	s = substr(s, i+2, length(s)-i-2)
	i = match(s, "}{")
	newpage = int(substr(s, 1, i))
	if (chapterno > 7) {
		printf("pdfjam --outfile separata/%s.pdf buch.pdf %d-%d\n", identifier, startpage + offsetpage, newpage + offsetpage - 1)
	}
	startpage = newpage
	chapterno = newchapterno
	identifier = newidentifier
}
END {
	printf("pdfjam --outfile separata/%s.pdf buch.pdf %d-\n", identifier, startpage + offsetpage)
}' buch.aux | bash