#!/bin/bash

# Give this script a .pdf and it will attempt
# to return a proper .bib citation via doi.
# Internet connection required.

# Get the doi from metadata, if not possible, get
# doi from pdftotext output, if not possible, exit.
doi=$(pdfinfo "$1" | grep -o doi:.*) ||
	doi=$(pdftotext "$1" - | grep -o doi.* -m 1) ||
	exit 1

# Check crossref.org for the bib citation.
curl -s "http://api.crossref.org/works/$doi/transform/application/x-bibtex" -w "\n" |
	sed -e "/^[^\(\t\|@\|}\)]/d"