1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
| | ;;; oc-biblatex.el --- biblatex citation processor for Org -*- lexical-binding: t; -*-
;; Copyright (C) 2021-2022 Free Software Foundation, Inc.
;; Author: Nicolas Goaziou <mail@nicolasgoaziou.fr>
;; This file is part of GNU Emacs.
;; GNU Emacs 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.
;; GNU Emacs 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 GNU Emacs. If not, see <https://www.gnu.org/licenses/>.
;;; Commentary:
;; This library registers the `biblatex' citation processor, which provides
;; the "export" capability for citations.
;; The processor relies on "biblatex" LaTeX package. As such it ensures that
;; the package is properly required in the document's preamble. More
;; accurately, it will re-use any "\usepackage{biblatex}" already present in
;; the document (e.g., through `org-latex-packages-alist'), or insert one using
;; options defined in `org-cite-biblatex-options'.
;; In any case, the library will override style-related options with those
;; specified with the citation processor, in `org-cite-export-processors' or
;; "cite_export" keyword. If you need to use different styles for bibliography
;; and citations, you can separate them with "bibstyle/citestyle" syntax. E.g.,
;;
;; #+cite_export: biblatex authortitle/authortitle-ibid
;; The library supports the following citation styles:
;;
;; - author (a), including caps (c), full (f) and caps-full (cf) variants,
;; - locators (l), including bare (b), caps (c) and bare-caps (bc) variants,
;; - noauthor (na), including bare (b) variant,
;; - nocite (n),
;; - text (t), including caps (c) variant,
;; - default style, including bare (b), caps (c) and bare-caps (bc) variants.
;; When citation and style permit, the library automatically generates
;; "multicite" versions of the commands above.
;; Bibliography is printed using "\printbibliography" command. Additional
;; options may be passed to it through a property list attached to the
;; "print_bibliography" keyword. E.g.,
;;
;; #+print_bibliography: :section 2 :heading subbibliography
;;
;; Values including spaces must be surrounded with double quotes. If you need
;; to use a key multiple times, you can separate its values with commas, but
;; without any space in-between:
;;
;; #+print_bibliography: :keyword abc,xyz :title "Primary Sources"
;;; Code:
(require 'map)
(require 'org-macs)
(require 'oc)
(declare-function org-element-property "org-element" (property element))
(declare-function org-export-data "org-export" (data info))
\f
;;; Customization
(defcustom org-cite-biblatex-options nil
"Options added to \"biblatex\" package.
If \"biblatex\" package is already required in the document, e.g., through
`org-latex-packages-alist' variable, these options are ignored."
:group 'org-cite
:package-version '(Org . "9.5")
:type '(choice
(string :tag "Options (key=value,key2=value2...)")
(const :tag "No option" nil))
:safe #'string-or-null-p)
(defcustom org-cite-biblatex-styles
'(("author" "caps" "Citeauthor*" nil nil)
("author" "full" "citeauthor" nil nil)
("author" "caps-full" "Citeauthor" nil nil)
("author" nil "citeauthor*" nil nil)
("locators" "bare" "notecite" nil nil)
("locators" "caps" "Pnotecite" nil nil)
("locators" "bare-caps" "Notecite" nil nil)
("locators" nil "pnotecite" nil nil)
("noauthor" "bare" "cite*" nil nil)
("noauthor" nil "autocite*" nil nil)
("nocite" nil "nocite" nil t)
("text" "caps" "Textcite" "Textcites" nil)
("text" nil "textcite" "textcites" nil)
(nil "bare" "cite" "cites" nil)
(nil "caps" "Autocite" "Autocites" nil)
(nil "bare-caps" "Cite" "Cites" nil)
(nil nil "autocite" "autocites" nil))
"List of styles and variants, with associated BibLaTeX commands.
Each style follows the pattern
(NAME VARIANT COMMAND MULTI-COMMAND NO-OPTION)
where:
NAME is the name of the style, as a string, or nil. The nil
style is the default style. As such, it must have an entry in
the list.
VARIANT is the name of the style variant, as a string or nil.
The nil variant is the default variant for the current style.
As such, each style name must be associated to a nil variant.
COMMAND is the LaTeX command to use, as a string. It should
not contain the leading backslash character.
MULTI-COMMAND is the LaTeX command to use when a multi-cite
command is appropriate. When nil, the style is deemed
inappropriate for multi-cites. The command should not contain
the leading backslash character.
NO-OPTION is a boolean. When non-nil, no optional argument
should be added to the LaTeX command.
Each NAME-VARIANT pair should be unique in the list.
It is also possible to provide shortcuts for style and variant
names. See `org-cite-biblatex-style-shortcuts'."
:group 'org-cite
:package-version '(Org . "9.6")
:type '(repeat
(list :tag "Style/variant combination"
;; Name part.
(choice :tag "Style"
(string :tag "Name")
(const :tag "Default style" nil))
;; Variant part.
(choice :tag "Variant"
(string :tag "Name")
(const :tag "Default variant" nil))
;; Command part.
(string :tag "Command name")
(choice :tag "Multicite command"
(string :tag "Command name")
(const :tag "No multicite support" nil))
(choice :tag "Skip optional arguments"
(const :tag "Yes" t)
(const :tag "No" nil)))))
(defcustom org-cite-biblatex-style-shortcuts
'(("a" . "author")
("b" . "bare")
("bc" . "bare-caps")
("c" . "caps")
("cf" . "caps-full")
("f" . "full")
("l" . "locators")
("n" . "nocite")
("na" . "noauthor")
("t" . "text"))
"List of shortcuts associated to style or variant names.
Each entry is a pair (NAME . STYLE-NAME) where NAME is the name
of the shortcut, as a string, and STYLE-NAME is the name of
a style in `org-cite-biblatex-styles'."
:group 'org-cite
:package-version '(Org . "9.6")
:type '(repeat
(cons :tag "Shortcut"
(string :tag "Name")
(string :tag "Full name")))
:safe t)
\f
;;; Internal functions
(defun org-cite-biblatex--package-options (initial style)
"Return options string for \"biblatex\" package.
INITIAL is an initial style of comma-separated options, as a string or nil.
STYLE is the style definition as a string or nil.
Return a string."
(let ((options-no-style
(and initial
(let ((re (rx string-start (or "bibstyle" "citestyle" "style"))))
(seq-filter
(lambda (option) (not (string-match re option)))
(split-string (org-unbracket-string "[" "]" initial)
"," t " \t")))))
(style-options
(cond
((null style) nil)
((not (string-match "/" style)) (list (concat "style=" style)))
(t
(list (concat "bibstyle=" (substring style nil (match-beginning 0)))
(concat "citestyle=" (substring style (match-end 0))))))))
(if (or options-no-style style-options)
(format "[%s]"
(mapconcat #'identity
(append options-no-style style-options)
","))
"")))
(defun org-cite-biblatex--multicite-p (citation)
"Non-nil when citation could make use of a \"multicite\" command."
(let ((references (org-cite-get-references citation)))
(and (< 1 (length references))
(seq-some (lambda (r)
(or (org-element-property :prefix r)
(org-element-property :suffix r)))
references))))
(defun org-cite-biblatex--atomic-arguments (references info &optional no-opt)
"Build argument for the list of citation REFERENCES.
When NO-OPT argument is non-nil, only provide mandatory arguments."
(let ((mandatory
(format "{%s}"
(mapconcat (lambda (r) (org-element-property :key r))
references
","))))
(if no-opt mandatory
(let* ((origin (pcase references
(`(,reference) reference)
(`(,reference . ,_)
(org-element-property :parent reference))))
(suffix (org-element-property :suffix origin))
(prefix (org-element-property :prefix origin)))
(concat (and prefix
(format "[%s]" (org-trim (org-export-data prefix info))))
(cond
(suffix (format "[%s]"
(org-trim (org-export-data suffix info))))
(prefix "[]")
(t nil))
mandatory)))))
(defun org-cite-biblatex--multi-arguments (citation info)
"Build \"multicite\" command arguments for CITATION object.
INFO is the export state, as a property list."
(let ((global-prefix (org-element-property :prefix citation))
(global-suffix (org-element-property :suffix citation)))
(concat (and global-prefix
(format "(%s)"
(org-trim (org-export-data global-prefix info))))
(cond
;; Global pre/post-notes.
(global-suffix
(format "(%s)"
(org-trim (org-export-data global-suffix info))))
(global-prefix "()")
(t nil))
;; All arguments.
(mapconcat (lambda (r)
(org-cite-biblatex--atomic-arguments (list r) info))
(org-cite-get-references citation)
""))))
(defun org-cite-biblatex--command (citation info name &optional multi no-opt)
"Return BibLaTeX command NAME for CITATION object.
INFO is the export state, as a property list.
When optional argument MULTI is non-nil, use it as a multicite
command name when appropriate. When optional argument NO-OPT is
non-nil, do not add optional arguments to the command."
(if (and multi (org-cite-biblatex--multicite-p citation))
(format "\\%s%s" multi (org-cite-biblatex--multi-arguments citation info))
(format "\\%s%s"
name
(org-cite-biblatex--atomic-arguments
(org-cite-get-references citation) info no-opt))))
(defun org-cite-biblatex--expand-shortcuts (style)
"Return STYLE pair with shortcuts expanded."
(pcase style
(`(,style . ,variant)
(cons (or (alist-get style org-cite-biblatex-style-shortcuts
nil nil #'equal)
style)
(or (alist-get variant org-cite-biblatex-style-shortcuts
nil nil #'equal)
variant)))
(_ (error "This should not happen"))))
(defun org-cite-biblatex-list-styles ()
"List styles and variants supported in `biblatex' citation processor.
The output format is appropriate as a value for `:cite-styles' keyword
in `org-cite-register-processor', which see."
(let ((shortcuts (make-hash-table :test #'equal))
(variants (make-hash-table :test #'equal)))
(pcase-dolist (`(,name . ,full-name) org-cite-biblatex-style-shortcuts)
(push name (gethash full-name shortcuts)))
(pcase-dolist (`(,name ,variant . ,_) org-cite-biblatex-styles)
(unless (null variant) (push variant (gethash name variants))))
(map-apply (lambda (style-name variants)
(cons (cons (or style-name "nil")
(gethash style-name shortcuts))
(mapcar (lambda (v)
(cons v (gethash v shortcuts)))
variants)))
variants)))
\f
;;; Export capability
(defun org-cite-biblatex-export-bibliography (_keys _files _style props &rest _)
"Print references from bibliography.
PROPS is the local properties of the bibliography, as a property list."
(concat "\\printbibliography"
(and props
(let ((key nil)
(results nil))
(dolist (datum props)
(cond
((keywordp datum)
(when key (push key results))
(setq key (substring (symbol-name datum) 1)))
(t
;; Comma-separated values are associated to the
;; same keyword.
(push (mapconcat (lambda (v) (concat key "=" v))
(split-string datum "," t)
",")
results)
(setq key nil))))
(format "[%s]"
(mapconcat #'identity (nreverse results) ","))))))
(defun org-cite-biblatex-export-citation (citation style _ info)
"Export CITATION object.
STYLE is the citation style, as a pair of either strings or nil.
INFO is the export state, as a property list."
(pcase-let* ((`(,name . ,variant) (org-cite-biblatex--expand-shortcuts style))
(candidates nil)
(style-match-flag nil))
(catch :match
;; Walk `org-cite-biblatex-styles' and prioritize matching
;; candidates. At the end of the process, the optimal candidate
;; should appear in front of CANDIDATES.
(dolist (style org-cite-biblatex-styles)
(pcase style
;; A matching style-variant pair trumps anything else.
;; Return it.
(`(,(pred (equal name)) ,(pred (equal variant)) . ,_)
(throw :match (setq candidates (list style))))
;; nil-nil style-variant is the fallback value. Consider it
;; only if nothing else matches.
(`(nil nil . ,_)
(unless candidates (push style candidates)))
;; A matching style with default variant trumps a matching
;; variant without the adequate style. Ensure the former
;; appears first in the list.
(`(,(pred (equal name)) nil . ,_)
(push style candidates)
(setq style-match-flag t))
(`(nil ,(pred (equal variant)) . ,_)
(unless style-match-flag (push style candidates)))
;; Discard anything else.
(_ nil))))
(apply
#'org-cite-biblatex--command citation info
(pcase (seq-elt candidates 0) ;; `seq-first' is not available in Emacs 26.
(`(,_ ,_ . ,command-parameters) command-parameters)
('nil
(user-error
"Missing default style or variant in `org-cite-biblatex-styles'"))
(other
(user-error "Invalid entry %S in `org-cite-biblatex-styles'" other))))))
(defun org-cite-biblatex-prepare-preamble (output _keys files style &rest _)
"Prepare document preamble for \"biblatex\" usage.
OUTPUT is the final output of the export process. FILES is the list of file
names used as the bibliography.
This function ensures \"biblatex\" package is required. It also adds resources
to the document, and set styles."
(with-temp-buffer
(save-excursion (insert output))
(when (search-forward "\\begin{document}" nil t)
;; Ensure there is a \usepackage{biblatex} somewhere or add one.
;; Then set options.
(goto-char (match-beginning 0))
(let ((re (rx "\\usepackage"
(opt (group "[" (*? anything) "]"))
"{biblatex}")))
(cond
;; No "biblatex" package loaded. Insert "usepackage" command
;; with appropriate options, including style.
((not (re-search-backward re nil t))
(save-excursion
(insert
(format "\\usepackage%s{biblatex}\n"
(org-cite-biblatex--package-options
org-cite-biblatex-options style)))))
;; "biblatex" package loaded, but without any option.
;; Include style only.
((not (match-beginning 1))
(search-forward "{" nil t)
(insert (org-cite-biblatex--package-options nil style)))
;; "biblatex" package loaded with some options set. Override
;; style-related options with ours.
(t
(replace-match
(save-match-data
(org-cite-biblatex--package-options (match-string 1) style))
nil nil nil 1))))
;; Insert resources below.
(forward-line)
(insert (mapconcat (lambda (f)
(format "\\addbibresource%s{%s}"
(if (org-url-p f) "[location=remote]" "")
f))
files
"\n")
"\n"))
(buffer-string)))
\f
;;; Register `biblatex' processor
(org-cite-register-processor 'biblatex
:export-bibliography #'org-cite-biblatex-export-bibliography
:export-citation #'org-cite-biblatex-export-citation
:export-finalizer #'org-cite-biblatex-prepare-preamble
:cite-styles #'org-cite-biblatex-list-styles)
(provide 'oc-biblatex)
;;; oc-biblatex.el ends here
|