438 lines
18 KiB
EmacsLisp
438 lines
18 KiB
EmacsLisp
;;; oc-biblatex.el --- biblatex citation processor for Org -*- lexical-binding: t; -*-
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;; Copyright (C) 2021-2022 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 `biblatex' citation processor, which provides
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;; the "export" capability for citations.
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;; The processor relies on "biblatex" LaTeX package. As such it ensures that
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;; the package is properly required in the document's preamble. More
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;; accurately, it will re-use any "\usepackage{biblatex}" already present in
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;; the document (e.g., through `org-latex-packages-alist'), or insert one using
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;; options defined in `org-cite-biblatex-options'.
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;; In any case, the library will override style-related options with those
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;; specified with the citation processor, in `org-cite-export-processors' or
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;; "cite_export" keyword. If you need to use different styles for bibliography
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;; and citations, you can separate them with "bibstyle/citestyle" syntax. E.g.,
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;;
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;; #+cite_export: biblatex authortitle/authortitle-ibid
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;; The library supports the following citation styles:
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;;
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;; - author (a), including caps (c), full (f) and caps-full (cf) variants,
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;; - locators (l), including bare (b), caps (c) and bare-caps (bc) variants,
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;; - noauthor (na), including bare (b) variant,
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;; - nocite (n),
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;; - text (t), including caps (c) variant,
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;; - default style, including bare (b), caps (c) and bare-caps (bc) variants.
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;; When citation and style permit, the library automatically generates
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;; "multicite" versions of the commands above.
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;; Bibliography is printed using "\printbibliography" command. Additional
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;; options may be passed to it through a property list attached to the
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;; "print_bibliography" keyword. E.g.,
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;;
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;; #+print_bibliography: :section 2 :heading subbibliography
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;;
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;; Values including spaces must be surrounded with double quotes. If you need
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;; to use a key multiple times, you can separate its values with commas, but
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;; without any space in-between:
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;;
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;; #+print_bibliography: :keyword abc,xyz :title "Primary Sources"
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;;; Code:
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(require 'map)
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(require 'org-macs)
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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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;;; Customization
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(defcustom org-cite-biblatex-options nil
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"Options added to \"biblatex\" package.
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If \"biblatex\" 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 '(choice
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(string :tag "Options (key=value,key2=value2...)")
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(const :tag "No option" nil))
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:safe #'string-or-null-p)
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(defcustom org-cite-biblatex-styles
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'(("author" "caps" "Citeauthor*" nil nil)
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("author" "full" "citeauthor" nil nil)
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("author" "caps-full" "Citeauthor" nil nil)
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("author" nil "citeauthor*" nil nil)
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("locators" "bare" "notecite" nil nil)
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("locators" "caps" "Pnotecite" nil nil)
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("locators" "bare-caps" "Notecite" nil nil)
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("locators" nil "pnotecite" nil nil)
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("noauthor" "bare" "cite*" nil nil)
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("noauthor" nil "autocite*" nil nil)
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("nocite" nil "nocite" nil t)
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("text" "caps" "Textcite" "Textcites" nil)
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("text" nil "textcite" "textcites" nil)
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(nil "bare" "cite" "cites" nil)
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(nil "caps" "Autocite" "Autocites" nil)
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(nil "bare-caps" "Cite" "Cites" nil)
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(nil nil "autocite" "autocites" nil))
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"List of styles and variants, with associated BibLaTeX commands.
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Each style follows the pattern
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(NAME VARIANT COMMAND MULTI-COMMAND NO-OPTION)
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where:
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NAME is the name of the style, as a string, or nil. The nil
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style is the default style. As such, it must have an entry in
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the list.
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VARIANT is the name of the style variant, as a string or nil.
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The nil variant is the default variant for the current style.
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As such, each style name must be associated to a nil variant.
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COMMAND is the LaTeX command to use, as a string. It should
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not contain the leading backslash character.
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MULTI-COMMAND is the LaTeX command to use when a multi-cite
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command is appropriate. When nil, the style is deemed
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inappropriate for multi-cites. The command should not contain
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the leading backslash character.
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NO-OPTION is a boolean. When non-nil, no optional argument
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should be added to the LaTeX command.
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Each NAME-VARIANT pair should be unique in the list.
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It is also possible to provide shortcuts for style and variant
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names. See `org-cite-biblatex-style-shortcuts'."
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:group 'org-cite
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:package-version '(Org . "9.6")
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:type '(repeat
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(list :tag "Style/variant combination"
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;; Name part.
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(choice :tag "Style"
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(string :tag "Name")
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(const :tag "Default style" nil))
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;; Variant part.
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(choice :tag "Variant"
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(string :tag "Name")
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(const :tag "Default variant" nil))
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;; Command part.
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(string :tag "Command name")
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(choice :tag "Multicite command"
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(string :tag "Command name")
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(const :tag "No multicite support" nil))
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(choice :tag "Skip optional arguments"
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(const :tag "Yes" t)
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(const :tag "No" nil)))))
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(defcustom org-cite-biblatex-style-shortcuts
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'(("a" . "author")
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("b" . "bare")
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("bc" . "bare-caps")
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("c" . "caps")
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("cf" . "caps-full")
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("f" . "full")
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("l" . "locators")
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("n" . "nocite")
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("na" . "noauthor")
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("t" . "text"))
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"List of shortcuts associated to style or variant names.
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Each entry is a pair (NAME . STYLE-NAME) where NAME is the name
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of the shortcut, as a string, and STYLE-NAME is the name of
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a style in `org-cite-biblatex-styles'."
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:group 'org-cite
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:package-version '(Org . "9.6")
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:type '(repeat
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(cons :tag "Shortcut"
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(string :tag "Name")
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(string :tag "Full name")))
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:safe t)
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;;; Internal functions
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(defun org-cite-biblatex--package-options (initial style)
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"Return options string for \"biblatex\" package.
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INITIAL is an initial style of comma-separated options, as a string or nil.
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STYLE is the style definition as a string or nil.
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Return a string."
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(let ((options-no-style
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(and initial
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(let ((re (rx string-start (or "bibstyle" "citestyle" "style"))))
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(seq-filter
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(lambda (option) (not (string-match re option)))
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(split-string (org-unbracket-string "[" "]" initial)
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"," t " \t")))))
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(style-options
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(cond
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((null style) nil)
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((not (string-match "/" style)) (list (concat "style=" style)))
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(t
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(list (concat "bibstyle=" (substring style nil (match-beginning 0)))
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(concat "citestyle=" (substring style (match-end 0))))))))
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(if (or options-no-style style-options)
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(format "[%s]"
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(mapconcat #'identity
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(append options-no-style style-options)
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","))
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"")))
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(defun org-cite-biblatex--multicite-p (citation)
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"Non-nil when citation could make use of a \"multicite\" command."
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(let ((references (org-cite-get-references citation)))
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(and (< 1 (length references))
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(seq-some (lambda (r)
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(or (org-element-property :prefix r)
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(org-element-property :suffix r)))
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references))))
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(defun org-cite-biblatex--atomic-arguments (references info &optional no-opt)
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"Build argument for the list of citation REFERENCES.
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When NO-OPT argument is non-nil, only provide mandatory arguments."
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(let ((mandatory
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(format "{%s}"
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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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(if no-opt mandatory
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(let* ((origin (pcase references
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(`(,reference) reference)
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(`(,reference . ,_)
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(org-element-property :parent reference))))
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(suffix (org-element-property :suffix origin))
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(prefix (org-element-property :prefix origin)))
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(concat (and prefix
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(format "[%s]" (org-trim (org-export-data prefix info))))
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(cond
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(suffix (format "[%s]"
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(org-trim (org-export-data suffix info))))
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(prefix "[]")
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(t nil))
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mandatory)))))
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(defun org-cite-biblatex--multi-arguments (citation info)
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"Build \"multicite\" command arguments for CITATION object.
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INFO is the export state, as a property list."
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(let ((global-prefix (org-element-property :prefix citation))
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(global-suffix (org-element-property :suffix citation)))
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(concat (and global-prefix
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(format "(%s)"
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(org-trim (org-export-data global-prefix info))))
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(cond
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;; Global pre/post-notes.
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(global-suffix
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(format "(%s)"
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(org-trim (org-export-data global-suffix info))))
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(global-prefix "()")
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(t nil))
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;; All arguments.
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(mapconcat (lambda (r)
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(org-cite-biblatex--atomic-arguments (list r) info))
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(org-cite-get-references citation)
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"")
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;; According to BibLaTeX manual, left braces or brackets
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;; following a multicite command could be parsed as other
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;; arguments. So we stop any further parsing by inserting
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;; a \relax unconditionally.
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"\\relax")))
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(defun org-cite-biblatex--command (citation info name &optional multi no-opt)
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"Return BibLaTeX command NAME for CITATION object.
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INFO is the export state, as a property list.
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When optional argument MULTI is non-nil, use it as a multicite
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command name when appropriate. When optional argument NO-OPT is
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non-nil, do not add optional arguments to the command."
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(if (and multi (org-cite-biblatex--multicite-p citation))
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(format "\\%s%s" multi (org-cite-biblatex--multi-arguments citation info))
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(format "\\%s%s"
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name
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(org-cite-biblatex--atomic-arguments
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(org-cite-get-references citation) info no-opt))))
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(defun org-cite-biblatex--expand-shortcuts (style)
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"Return STYLE pair with shortcuts expanded."
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(pcase style
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(`(,style . ,variant)
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(cons (or (alist-get style org-cite-biblatex-style-shortcuts
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nil nil #'equal)
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style)
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(or (alist-get variant org-cite-biblatex-style-shortcuts
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nil nil #'equal)
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variant)))
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(_ (error "This should not happen"))))
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(defun org-cite-biblatex-list-styles ()
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"List styles and variants supported in `biblatex' citation processor.
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The output format is appropriate as a value for `:cite-styles' keyword
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in `org-cite-register-processor', which see."
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(let ((shortcuts (make-hash-table :test #'equal))
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(variants (make-hash-table :test #'equal)))
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(pcase-dolist (`(,name . ,full-name) org-cite-biblatex-style-shortcuts)
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(push name (gethash full-name shortcuts)))
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(pcase-dolist (`(,name ,variant . ,_) org-cite-biblatex-styles)
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(unless (null variant) (push variant (gethash name variants))))
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(map-apply (lambda (style-name variants)
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(cons (cons (or style-name "nil")
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(gethash style-name shortcuts))
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(mapcar (lambda (v)
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(cons v (gethash v shortcuts)))
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variants)))
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variants)))
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;;; Export capability
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(defun org-cite-biblatex-export-bibliography (_keys _files _style props &rest _)
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"Print references from bibliography.
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PROPS is the local properties of the bibliography, as a property list."
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(concat "\\printbibliography"
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(and props
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(let ((key nil)
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(results nil))
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(dolist (datum props)
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(cond
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((keywordp datum)
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(when key (push key results))
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(setq key (substring (symbol-name datum) 1)))
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(t
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;; Comma-separated values are associated to the
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;; same keyword.
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(push (mapconcat (lambda (v) (concat key "=" v))
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(split-string datum "," t)
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",")
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results)
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(setq key nil))))
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(format "[%s]"
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(mapconcat #'identity (nreverse results) ","))))))
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(defun org-cite-biblatex-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 either strings or nil.
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INFO is the export state, as a property list."
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(pcase-let* ((`(,name . ,variant) (org-cite-biblatex--expand-shortcuts style))
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(candidates nil)
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(style-match-flag nil))
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(catch :match
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;; Walk `org-cite-biblatex-styles' and prioritize matching
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;; candidates. At the end of the process, the optimal candidate
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;; should appear in front of CANDIDATES.
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(dolist (style org-cite-biblatex-styles)
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(pcase style
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;; A matching style-variant pair trumps anything else.
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;; Return it.
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(`(,(pred (equal name)) ,(pred (equal variant)) . ,_)
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(throw :match (setq candidates (list style))))
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;; nil-nil style-variant is the fallback value. Consider it
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;; only if nothing else matches.
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(`(nil nil . ,_)
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(unless candidates (push style candidates)))
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;; A matching style with default variant trumps a matching
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;; variant without the adequate style. Ensure the former
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;; appears first in the list.
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(`(,(pred (equal name)) nil . ,_)
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(push style candidates)
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(setq style-match-flag t))
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(`(nil ,(pred (equal variant)) . ,_)
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(unless style-match-flag (push style candidates)))
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;; Discard anything else.
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(_ nil))))
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(apply
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#'org-cite-biblatex--command citation info
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(pcase (seq-first candidates)
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(`(,_ ,_ . ,command-parameters) command-parameters)
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('nil
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(user-error
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"Missing default style or variant in `org-cite-biblatex-styles'"))
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(other
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(user-error "Invalid entry %S in `org-cite-biblatex-styles'" other))))))
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(defun org-cite-biblatex-prepare-preamble (output _keys files style &rest _)
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"Prepare document preamble for \"biblatex\" usage.
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OUTPUT is the final output of the export process. FILES is the list of file
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names used as the bibliography.
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This function ensures \"biblatex\" package is required. It also adds resources
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to the document, and set styles."
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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{biblatex} somewhere or add one.
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;; Then set options.
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(goto-char (match-beginning 0))
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(let ((re (rx "\\usepackage"
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(opt (group "[" (*? anything) "]"))
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"{biblatex}")))
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(cond
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;; No "biblatex" package loaded. Insert "usepackage" command
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;; with appropriate options, including style.
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((not (re-search-backward re nil t))
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(save-excursion
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(insert
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(format "\\usepackage%s{biblatex}\n"
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(org-cite-biblatex--package-options
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org-cite-biblatex-options style)))))
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;; "biblatex" package loaded, but without any option.
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;; Include style only.
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((not (match-beginning 1))
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(search-forward "{" nil t)
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(insert (org-cite-biblatex--package-options nil style)))
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;; "biblatex" package loaded with some options set. Override
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;; style-related options with ours.
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(t
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(replace-match
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(save-match-data
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(org-cite-biblatex--package-options (match-string 1) style))
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nil nil nil 1))))
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;; Insert resources below.
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(forward-line)
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(insert (mapconcat (lambda (f)
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(format "\\addbibresource%s{%s}"
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(if (org-url-p f) "[location=remote]" "")
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f))
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files
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"\n")
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"\n"))
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(buffer-string)))
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;;; Register `biblatex' processor
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(org-cite-register-processor 'biblatex
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:export-bibliography #'org-cite-biblatex-export-bibliography
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:export-citation #'org-cite-biblatex-export-citation
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:export-finalizer #'org-cite-biblatex-prepare-preamble
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:cite-styles #'org-cite-biblatex-list-styles)
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(provide 'oc-biblatex)
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;;; oc-biblatex.el ends here
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