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#!/bin/sh
BIB_FILE="${HOME}/latex/uni.bib"
[ -f "${BIB_FILE}" ] || BIB_FILE="${2:-$(find "${HOME}" -path "${HOME}/.*" \
-prune -o -type "f" -name "*.bib" -print -quit)}"
{ [ -f "${BIB_FILE}" ] || [ "${2}" ]; } || {
printf "%s\n" "Create a .bib file or provide as \$2." && exit "1"
}
filter() {
sed -n -E 's/.*((DOI|doi)((\.(org))?\/?|:? *))([^: ]+[^ .]).*/\6/p; T; q'
}
fpdf() {
pdf="${1}"
doi="$(pdfinfo "${pdf}" 2>"/dev/null" | filter)"
[ "${doi}" ] || doi="$(pdftotext -q -l "2" "${pdf}" - 2>"/dev/null" | filter)"
[ "${doi}" ] || printf "%s\n" "No DOI found for PDF: ${pdf}" >&2
printf "%s\n" "${doi}"
}
arrange() {
sed 's/\}, /\},\n /g
s/, /,\n /
s/ }/\n}/
s/,\s*pages=/,\n\tpages=/' |
sed '1s/^ *//
1s/[0-9]*\([0-9]\{2\}\)/\1/
1s/_//
1s/.*/\L&/
s/.*=/\L&/
s/=/ = /'
}
doi2bib() {
doi="${1#doi:}"
url="https://api.crossref.org/works/${doi}/transform/application/x-bibtex"
entry="$(curl -kLsS --no-fail "${url}" | arrange)"
red='\033[0;31m'
reset='\033[0m'
printf "${red}%s${reset}\n" "${entry}"
[ "${entry%"${entry#?}"}" != "@" ] && {
printf "%s\n" "Failed to fetch bibtex entry for DOI: ${doi}"
return "1"
}
grep -iFq "doi = {${doi}}" "${BIB_FILE}" 2>"/dev/null" && {
printf "%s\n" "Bibtex entry for DOI: ${doi} already exists in the file."
} || {
[ -s "${BIB_FILE}" ] && printf "\n" >>"${BIB_FILE}"
printf "%s\n" "${entry}" >>"${BIB_FILE}"
printf "%s\n" "Added bibtex entry for DOI: ${doi}"
}
}
[ "${1}" ] || {
printf "%s\n" "Give either a pdf file or a DOI or a directory path that has PDFs as an argument."
exit "1"
}
[ -f "${1}" ] && doi="$(fpdf "${1}")" && doi2bib "${doi}" && exit "0"
[ -d "${1}" ] && for i in "${1}"/*.pdf; do doi="$(fpdf "${i}")" && doi2bib "${doi}"; done && exit "0"
doi="$(printf "%s\n" "${1}" | filter)" && doi2bib "${doi}"
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