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;;; biblio-dblp.el --- Lookup and import bibliographic entries from DBLP -*- 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 DBLP (a great source of
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;; references for Computer Science papers) using `dblp-lookup'.
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;;
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;; This file implements a backend for the 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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(defun biblio-dblp--forward-bibtex (metadata forward-to)
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"Forward BibTeX for DBLP entry METADATA to FORWARD-TO."
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(let* ((source-url (biblio-alist-get 'url metadata))
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(url (replace-regexp-in-string "/rec/" "/rec/bib2/" source-url t t)))
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(biblio-url-retrieve url (biblio-generic-url-callback
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(lambda () ;; No allowed errors, so no arguments
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"Parse DBLP BibTeX results."
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(funcall forward-to
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(biblio-format-bibtex
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(biblio-response-as-utf-8))))))))
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(defun biblio-dblp--extract-interesting-fields (item)
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"Prepare a DBLP search result ITEM for display."
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(let-alist (biblio-alist-get 'info item)
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(list (cons 'year (cadr .year))
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(cons 'title (cadr .title))
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(cons 'authors (seq-map #'cl-caddr (cdr .authors)))
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(cons 'container (cadr .venue))
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(cons 'references nil)
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(cons 'type (cadr .type))
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(cons 'url (cadr .url)))))
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(defun biblio-dblp--hitp (item)
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"Check if ITEM is a DBLP hit."
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(eq (car-safe item) 'hit))
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(defun biblio-dblp--parse-search-results ()
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"Extract search results from DBLP response."
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(biblio-decode-url-buffer 'utf-8)
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(let-alist (car (xml-parse-region (point-min) (point-max)))
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(unless (string= (cadr .status) "OK")
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(display-warning 'biblio-dblp "DBLP query failed"))
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(seq-map #'biblio-dblp--extract-interesting-fields (seq-filter #'biblio-dblp--hitp .hits))))
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(defun biblio-dblp--url (query)
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"Create a DBLP url to look up QUERY."
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(format "http://dblp.uni-trier.de/search/publ/api?q=%s&format=xml" (url-encode-url query)))
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;;;###autoload
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(defun biblio-dblp-backend (command &optional arg &rest more)
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"A DBLP 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 "DBLP")
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(`prompt "DBLP query: ")
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(`url (biblio-dblp--url arg))
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(`parse-buffer (biblio-dblp--parse-search-results))
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(`forward-bibtex (biblio-dblp--forward-bibtex arg (car more)))
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(`register (add-to-list 'biblio-backends #'biblio-dblp-backend))))
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;;;###autoload
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(add-hook 'biblio-init-hook #'biblio-dblp-backend)
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;;;###autoload
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(defun biblio-dblp-lookup (&optional query)
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"Start a DBLP search for QUERY, prompting if needed."
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(interactive)
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(biblio-lookup #'biblio-dblp-backend query))
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;;;###autoload
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(defalias 'dblp-lookup 'biblio-dblp-lookup)
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(provide 'biblio-dblp)
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;;; biblio-dblp.el ends here
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