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