#!/bin/sh

[ -z $(which jq) ] && printf "isbn: I require jq(1) to work, but I can't find it on your system!\n" && exit

baseurl=https://www.googleapis.com/books/v1/volumes?q=isbn:

resultstring=$(curl -s $baseurl$1 | jq -jr '.items[].volumeInfo.authors[], "\t", .items[].volumeInfo.title, "\t", .items[].volumeInfo.publisher, "\t", .items[].volumeInfo.publishedDate' | sed -e 's/\n/\t/g')

author=$(echo "$resultstring" | cut -f1)
title=$(echo "$resultstring" | cut -f2)
publisher=$(echo "$resultstring" | cut -f3)
year=$(echo "$resultstring" | cut -f4 | head -c4)

emitbibtex() {
cat << EOF
@book{$(echo "$title" | tr [:upper:] [:lower:] | sed -e 's/ /-/g')
author="$author"
title="$title"
publisher="$publisher"
year="$year"
}
EOF
}

emitsimple() {
cat << EOF
title: $title
author: $author
publisher: $publisher
date: $(echo "$resultstring" | cut -f4)
EOF
}

case "$#" in
	0) printf "isbn: no argument specified.\n" & exit ;;
	1) ;;
	2) ;;
	*) printf "isbn: too many arguments!\n" & exit ;;
esac

case "$2" in
	-b|--bibtex) emitbibtex ;;
	*) emitsimple ;;
esac