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;;; biblio-crossref.el --- Lookup and import bibliographic entries from CrossRef -*- lexical-binding: t -*-
;; Copyright (C) 2016 Clément Pit-Claudel
;; Author: Clément Pit-Claudel <clement.pitclaudel@live.com>
;; URL: http://github.com/cpitclaudel/biblio.el
;; This program is free software; you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation, either version 3 of the License, or
;; (at your option) any later version.
;;
;; This program is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;; GNU General Public License for more details.
;;
;; You should have received a copy of the GNU General Public License
;; along with this program. If not, see <http://www.gnu.org/licenses/>.
;;; Commentary:
;;
;; Lookup and download bibliographic records from CrossRef (a very nicely
;; curated metadata engine) using `crossref-lookup'.
;;
;; This file implements a backend for the `biblio' package (which see for more
;; documentation).
;;; Code:
(require 'biblio-core)
(require 'biblio-doi)
(defcustom biblio-crossref-user-email-address nil
"Email address to include in CrossRef queries, or nil.
CrossRef gives priority to queries that include an email address.
See URL `https://github.com/CrossRef/rest-api-doc#etiquette' for
more details."
:group 'biblio
:type '(choice (const :tag "Do not include an email address." nil)
(string :tag "Include an email address.")))
(defun biblio-crossref--forward-bibtex (metadata forward-to)
"Forward BibTeX for CrossRef entry METADATA to FORWARD-TO."
(biblio-doi-forward-bibtex (biblio-alist-get 'doi metadata) forward-to))
(defun biblio-crossref--format-affiliation (affiliation)
"Format AFFILIATION for CrossRef search results."
(mapconcat (apply-partially #'biblio-alist-get 'name) affiliation ", "))
(defun biblio-crossref--format-author (author)
"Format AUTHOR for CrossRef search results."
(let-alist author
(biblio-join " "
.given .family (biblio-parenthesize (biblio-crossref--format-affiliation .affiliation)))))
(defun biblio-crossref--extract-interesting-fields (item)
"Prepare a CrossRef search result ITEM for display."
(let-alist item
(list (cons 'doi .DOI)
(cons 'year (let ((year (aref (aref .issued.date-parts 0) 0)))
(and (numberp year) (number-to-string year))))
(cons 'title (biblio-join " "
(biblio-join-1 ", " .title)
(biblio-parenthesize (biblio-join-1 ", " .subtitle))))
(cons 'authors (seq-map #'biblio-crossref--format-author .author))
(cons 'publisher .publisher)
(cons 'container .container-title)
(cons 'references (seq-concatenate 'list (list .DOI) .isbn))
(cons 'type .type)
(cons 'url .URL))))
(defun biblio-crossref--parse-search-results ()
"Extract search results from CrossRef response."
(biblio-decode-url-buffer 'utf-8)
(let-alist (json-read)
(unless (string= .status "ok")
(display-warning 'biblio-crossref "CrossRef query failed"))
(seq-map #'biblio-crossref--extract-interesting-fields .message.items)))
(defun biblio-crossref--url (query)
"Create a CrossRef url to look up QUERY."
(format "http://api.crossref.org/works?query=%s%s"
(url-encode-url query)
(if biblio-crossref-user-email-address
(format "&mailto=%s" (url-encode-url biblio-crossref-user-email-address)) "")))
;;;###autoload
(defun biblio-crossref-backend (command &optional arg &rest more)
"A CrossRef backend for biblio.el.
COMMAND, ARG, MORE: See `biblio-backends'."
(pcase command
(`name "CrossRef")
(`prompt "CrossRef query: ")
(`url (biblio-crossref--url arg))
(`parse-buffer (biblio-crossref--parse-search-results))
(`forward-bibtex (biblio-crossref--forward-bibtex arg (car more)))
(`register (add-to-list 'biblio-backends #'biblio-crossref-backend))))
;;;###autoload
(add-hook 'biblio-init-hook #'biblio-crossref-backend)
;;;###autoload
(defun biblio-crossref-lookup (&optional query)
"Start a CrossRef search for QUERY, prompting if needed."
(interactive)
(biblio-lookup #'biblio-crossref-backend query))
;;;###autoload
(defalias 'crossref-lookup 'biblio-crossref-lookup)
(provide 'biblio-crossref)
;;; biblio-crossref.el ends here