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