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| | ;;; oc-bibtex.el --- Vanilla citation processor for LaTeX -*- lexical-binding: t; -*-
;; Copyright (C) 2021-2022 Free Software Foundation, Inc.
;; Author: Nicolas Goaziou <mail@nicolasgoaziou.fr>
;; This file is part of GNU Emacs.
;; 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 <https://www.gnu.org/licenses/>.
;;; Commentary:
;; This library registers the `bibtex' citation processor, which
;; provides the "export" capability for citations. It doesn't require
;; any LaTeX package.
;;
;; It supports the following citation styles:
;;
;; - nocite (n),
;; - default.
;;
;; Only suffixes are supported. Prefixes are ignored.
;;
;; Bibliography should consist of ".bib" files only.
;;; Code:
(require 'oc)
(declare-function org-element-property "org-element" (property element))
(declare-function org-export-data "org-export" (data info))
\f
;;; Export capability
(defun org-cite-bibtex-export-bibliography (_keys files style &rest _)
"Print references from bibliography FILES.
FILES is a list of absolute file names. STYLE is the bibliography style, as
a string or nil."
(concat (and style (format "\\bibliographystyle{%s}\n" style))
(format "\\bibliography{%s}"
(mapconcat #'file-name-sans-extension
files
","))))
(defun org-cite-bibtex-export-citation (citation style _ info)
"Export CITATION object.
STYLE is the citation style, as a pair of strings or nil. INFO is the export
state, as a property list."
(let ((references (org-cite-get-references citation)))
(format "\\%s%s{%s}"
(pcase style
(`(,(or "nocite" "n") . ,_) "nocite")
(_ "cite"))
(let ((suffix (cdr (org-cite-main-affixes citation))))
(if suffix
(format "[%s]" (org-trim (org-export-data suffix info)))
""))
(mapconcat (lambda (r) (org-element-property :key r))
references
","))))
\f
;;; Register `bibtex' processor
(org-cite-register-processor 'bibtex
:export-bibliography #'org-cite-bibtex-export-bibliography
:export-citation #'org-cite-bibtex-export-citation
:cite-styles
'((("nocite" "n"))
(("nil"))))
(provide 'oc-bibtex)
;;; oc-bibtex.el ends here
|