209 lines
8.2 KiB
EmacsLisp
209 lines
8.2 KiB
EmacsLisp
;;; oc-natbib.el --- Citation processor using natbib LaTeX package -*- lexical-binding: t; -*-
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;; Copyright (C) 2021-2024 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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;; GNU Emacs 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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;; GNU Emacs 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 GNU Emacs. If not, see <https://www.gnu.org/licenses/>.
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;;; Commentary:
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;; This library registers the `natbib' citation processor, which provides the
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;; "export" capability for citations.
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;; The processor relies on "natbib" LaTeX package. As such it ensures that the
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;; package is properly required in the document's preamble. More accurately, it
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;; will use any "\\usepackage{natbib}" command already present in the document
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;; (e.g., through `org-latex-packages-alist'), or insert one using options
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;; defined in `org-cite-natbib-options'.
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;; It supports the following citation styles:
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;;
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;; - author (a), including caps (c), and full (f) variants,
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;; - noauthor (na), including bare (b) variant,
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;; - text (t), including bare (b), caps (c), full (f), bare-caps (bc),
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;; bare-full (bf), caps-full (cf), and bare-caps-full (bcf) variants,
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;; - default, including bare (b), caps (c), full (f), bare-caps (bc),
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;; bare-full (bf), caps-full (cf), and bare-caps-full (bcf) variants.
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;; Bibliography accepts any style supported by "natbib" package.
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;;; Code:
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(require 'org-macs)
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(org-assert-version)
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(require 'oc)
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(declare-function org-element-property "org-element-ast" (property node))
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(declare-function org-export-data "org-export" (data info))
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;;; Customization
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(defcustom org-cite-natbib-options nil
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"List of options added to \"natbib\" package.
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If \"natbib\" package is already required in the document, e.g., through
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`org-latex-packages-alist' variable, these options are ignored."
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:group 'org-cite
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:package-version '(Org . "9.5")
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:type
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'(set
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(const :tag "use round parentheses (default)" round)
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(const :tag "use square brackets" square)
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(const :tag "use curly braces" curly)
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(const :tag "use angle brackets" angle)
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(const :tag "separate multiple citations with colons (default)" colon)
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(const :tag "separate multiple citations with comas" comma)
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(const :tag "generate author-year citations" authoryear)
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(const :tag "generate numerical citations" numbers)
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(const :tag "generate superscripted numerical citations" super)
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(const :tag "order multiple citations according to the list of references" sort)
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(const :tag "order as above, but numerical citations are compressed if possible" sort&compress)
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(const :tag "display full author list on first citation, abbreviate the others" longnamesfirst)
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(const :tag "redefine \\thebibliography to issue \\section* instead of \\chapter*" sectionbib)
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(const :tag "keep all the authors' names in a citation on one line" nonamebreak)))
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(defcustom org-cite-natbib-bibliography-style 'unsrtnat
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"Default bibliography style."
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:group 'org-cite
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:package-version '(Org . "9.7")
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:type
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'(choice
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(const unsrtnat)
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(symbol :tag "Other")))
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;;; Internal functions
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(defun org-cite-natbib--style-to-command (style)
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"Return command name to use according to STYLE pair."
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(pcase style
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;; "author" style.
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(`(,(or "author" "a") . ,variant)
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(pcase variant
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((or "caps" "c") "\\Citeauthor")
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((or "full" "f") "\\citeauthor*")
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(_ "\\citeauthor")))
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;; "noauthor" style.
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(`(,(or "noauthor" "na") . ,variant)
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(pcase variant
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((or "bare" "b") "\\citeyear")
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(_ "\\citeyearpar")))
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;; "nocite" style.
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(`(,(or "nocite" "n") . ,_) "\\nocite")
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;; "text" style.
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(`(,(or "text" "t") . ,variant)
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(pcase variant
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((or "bare" "b") "\\citealt")
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((or "caps" "c") "\\Citet")
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((or "full" "f") "\\citet*")
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((or "bare-caps" "bc") "\\Citealt")
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((or "bare-full" "bf") "\\citealt*")
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((or "caps-full" "cf") "\\Citet*")
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((or "bare-caps-full" "bcf") "\\Citealt*")
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(_ "\\citet")))
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;; Default ("nil") style.
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(`(,_ . ,variant)
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(pcase variant
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((or "bare" "b") "\\citealp")
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((or "caps" "c") "\\Citep")
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((or "full" "f") "\\citep*")
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((or "bare-caps" "bc") "\\Citealp")
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((or "bare-full" "bf") "\\citealp*")
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((or "caps-full" "cf") "\\Citep*")
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((or "bare-caps-full" "bcf") "\\Citealp*")
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(_ "\\citep")))
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;; This should not happen.
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(_ (error "Invalid style: %S" style))))
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(defun org-cite-natbib--build-optional-arguments (citation info)
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"Build optional arguments for citation command.
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CITATION is the citation object. INFO is the export state, as a property list."
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(pcase-let ((`(,prefix . ,suffix) (org-cite-main-affixes citation)))
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(concat (and prefix (format "[%s]" (org-trim (org-export-data prefix info))))
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(cond
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(suffix (format "[%s]" (org-trim (org-export-data suffix info))))
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(prefix "[]")
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(t nil)))))
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(defun org-cite-natbib--build-arguments (citation)
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"Build arguments for citation command for CITATION object."
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(format "{%s}"
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(mapconcat #'identity
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(org-cite-get-references citation t)
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",")))
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;;; Export capability
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(defun org-cite-natbib-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
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(format "\\bibliographystyle{%s}\n"
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(or style org-cite-natbib-bibliography-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-natbib-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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(concat (org-cite-natbib--style-to-command style)
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(org-cite-natbib--build-optional-arguments citation info)
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(org-cite-natbib--build-arguments citation)))
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(defun org-cite-natbib-use-package (output &rest _)
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"Ensure output requires \"natbib\" package.
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OUTPUT is the final output of the export process."
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(with-temp-buffer
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(save-excursion (insert output))
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(when (search-forward "\\begin{document}" nil t)
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;; Ensure there is a \usepackage{natbib} somewhere or add one.
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(goto-char (match-beginning 0))
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(let ((re (rx "\\usepackage" (opt "[" (*? nonl) "]") "{natbib}")))
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(unless (re-search-backward re nil t)
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(insert
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(format "\\usepackage%s{natbib}\n"
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(if (null org-cite-natbib-options)
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""
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(format "[%s]"
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(mapconcat #'symbol-name
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org-cite-natbib-options
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","))))))))
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(buffer-string)))
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;;; Register `natbib' processor
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(org-cite-register-processor 'natbib
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:export-bibliography #'org-cite-natbib-export-bibliography
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:export-citation #'org-cite-natbib-export-citation
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:export-finalizer #'org-cite-natbib-use-package
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:cite-styles
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'((("author" "a") ("caps" "a") ("full" "f"))
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(("noauthor" "na") ("bare" "b"))
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(("text" "t")
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("bare" "b") ("caps" "c") ("full" "f") ("bare-caps" "bc")
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("bare-full" "bf") ("caps-full" "cf") ("bare-caps-full" "bcf"))
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(("nil")
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("bare" "b") ("caps" "c") ("full" "f") ("bare-caps" "bc")
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("bare-full" "bf") ("caps-full" "cf") ("bare-caps-full" "bcf"))))
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(provide 'oc-natbib)
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;;; oc-natbib.el ends here
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