summaryrefslogtreecommitdiff
path: root/lisp/org-footnote.el
blob: 7fd55d9b908a26fcafef7708006ce58eb3ee4055 (plain)
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
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
;;; org-footnote.el --- Footnote support in Org and elsewhere
;;
;; Copyright (C) 2009-2015 Free Software Foundation, Inc.
;;
;; Author: Carsten Dominik <carsten at orgmode dot org>
;; Keywords: outlines, hypermedia, calendar, wp
;; Homepage: http://orgmode.org
;;
;; 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 <http://www.gnu.org/licenses/>.
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;
;;; Commentary:

;; This file contains the code dealing with footnotes in Org-mode.
;; The code can also be used in arbitrary text modes to provide
;; footnotes.  Compared to Steven L Baur's footnote.el it provides
;; better support for resuming editing.  It is less configurable than
;; Steve's code, though.

;;; Code:

(eval-when-compile
  (require 'cl))
(require 'org-macs)
(require 'org-compat)

(declare-function message-point-in-header-p "message" ())
(declare-function org-at-comment-p "org" ())
(declare-function org-at-heading-p "org" (&optional ignored))
(declare-function org-back-over-empty-lines "org" ())
(declare-function org-back-to-heading "org" (&optional invisible-ok))
(declare-function org-combine-plists "org" (&rest plists))
(declare-function org-edit-footnote-reference "org-src" ())
(declare-function org-element-context "org-element" (&optional element))
(declare-function org-element-property "org-element" (property element))
(declare-function org-element-type "org-element" (element))
(declare-function org-end-of-subtree "org"  (&optional invisible-ok to-heading))
(declare-function org-fill-paragraph "org" (&optional justify))
(declare-function org-icompleting-read "org" (&rest args))
(declare-function org-id-uuid "org-id" ())
(declare-function org-in-block-p "org" (names))
(declare-function org-in-regexp "org" (re &optional nlines visually))
(declare-function org-in-verbatim-emphasis "org" ())
(declare-function org-inside-LaTeX-fragment-p "org" ())
(declare-function org-inside-latex-macro-p "org" ())
(declare-function org-mark-ring-push "org" (&optional pos buffer))
(declare-function org-show-context "org" (&optional key))
(declare-function org-skip-whitespace "org" ())
(declare-function org-skip-whitespace "org" ())
(declare-function org-trim "org" (s))
(declare-function outline-next-heading "outline")

(defvar message-cite-prefix-regexp)	; defined in message.el
(defvar message-signature-separator)	; defined in message.el
(defvar org-bracket-link-regexp)	; defined in org.el
(defvar org-complex-heading-regexp)	; defined in org.el
(defvar org-element-all-elements)	; defined in org-element.el
(defvar org-element-all-objects)	; defined in org-element.el
(defvar org-odd-levels-only)		; defined in org.el
(defvar org-outline-regexp-bol)		; defined in org.el

(defconst org-footnote-re
  ;; Only [1]-like footnotes are closed in this regexp, as footnotes
  ;; from other types might contain square brackets (i.e. links) in
  ;; their definition.
  ;;
  ;; `org-re' is used for regexp compatibility with XEmacs.
  (concat "\\[\\(?:"
	  ;; Match inline footnotes.
	  (org-re "fn:\\([-_[:word:]]+\\)?:\\|")
	  ;; Match other footnotes.
	  "\\(?:\\([0-9]+\\)\\]\\)\\|"
	  (org-re "\\(fn:[-_[:word:]]+\\)")
	  "\\)")
  "Regular expression for matching footnotes.")

(defconst org-footnote-definition-re
  (org-re "^\\[\\([0-9]+\\|fn:[-_[:word:]]+\\)\\]")
  "Regular expression matching the definition of a footnote.")

(defconst org-footnote-forbidden-blocks
  '("ascii" "beamer" "comment" "example" "html" "latex" "odt" "src")
  "Names of blocks where footnotes are not allowed.")

(defgroup org-footnote nil
  "Footnotes in Org-mode."
  :tag "Org Footnote"
  :group 'org)

(defcustom org-footnote-section "Footnotes"
  "Outline heading containing footnote definitions.

This can be nil, to place footnotes locally at the end of the
current outline node.  If can also be the name of a special
outline heading under which footnotes should be put.

This variable defines the place where Org puts the definition
automatically, i.e. when creating the footnote, and when sorting
the notes.  However, by hand you may place definitions
*anywhere*.

If this is a string, during export, all subtrees starting with
this heading will be ignored.

If you don't use the customize interface to change this variable,
you will need to run the following command after the change:

  \\[universal-argument] \\[org-element-cache-reset]"
  :group 'org-footnote
  :initialize 'custom-initialize-default
  :set (lambda (var val)
	 (set var val)
	 (when (fboundp 'org-element-cache-reset)
	   (org-element-cache-reset 'all)))
  :type '(choice
	  (string :tag "Collect footnotes under heading")
	  (const :tag "Define footnotes locally" nil)))

(defcustom org-footnote-tag-for-non-org-mode-files "Footnotes:"
  "Tag marking the beginning of footnote section.
The Org footnote engine can be used in arbitrary text files as well
as in Org-mode.  Outside Org mode, new footnotes are always placed at
the end of the file.  When you normalize the notes, any line containing
only this tag will be removed, a new one will be inserted at the end
of the file, followed by the collected and normalized footnotes.

If you don't want any tag in such buffers, set this variable to nil."
  :group 'org-footnote
  :type '(choice
	  (string :tag "Collect footnotes under tag")
	  (const :tag "Don't use a tag" nil)))

(defcustom org-footnote-define-inline nil
  "Non-nil means define footnotes inline, at reference location.
When nil, footnotes will be defined in a special section near
the end of the document.  When t, the [fn:label:definition] notation
will be used to define the footnote at the reference position."
  :group 'org-footnote
  :type 'boolean)

(defcustom org-footnote-auto-label t
  "Non-nil means define automatically new labels for footnotes.
Possible values are:

nil        Prompt the user for each label.
t          Create unique labels of the form [fn:1], [fn:2], etc.
confirm    Like t, but let the user edit the created value.
           The label can be removed from the minibuffer to create
           an anonymous footnote.
random	   Automatically generate a unique, random label.
plain      Automatically create plain number labels like [1]."
  :group 'org-footnote
  :type '(choice
	  (const :tag "Prompt for label" nil)
	  (const :tag "Create automatic [fn:N]" t)
	  (const :tag "Offer automatic [fn:N] for editing" confirm)
	  (const :tag "Create a random label" random)
	  (const :tag "Create automatic [N]" plain)))

(defcustom org-footnote-auto-adjust nil
  "Non-nil means automatically adjust footnotes after insert/delete.
When this is t, after each insertion or deletion of a footnote,
simple fn:N footnotes will be renumbered, and all footnotes will be sorted.
If you want to have just sorting or just renumbering, set this variable
to `sort' or `renumber'.

The main values of this variable can be set with in-buffer options:

#+STARTUP: fnadjust
#+STARTUP: nofnadjust"
  :group 'org-footnote
  :type '(choice
	  (const :tag "No adjustment" nil)
	  (const :tag "Renumber" renumber)
	  (const :tag "Sort" sort)
	  (const :tag "Renumber and Sort" t)))

(defcustom org-footnote-fill-after-inline-note-extraction nil
  "Non-nil means fill paragraphs after extracting footnotes.
When extracting inline footnotes, the lengths of lines can change a lot.
When this option is set, paragraphs from which an inline footnote has been
extracted will be filled again."
  :group 'org-footnote
  :type 'boolean)

(defun org-footnote-in-valid-context-p ()
  "Is point in a context where footnotes are allowed?"
  (save-match-data
    (not (or (org-at-comment-p)
	     (org-inside-LaTeX-fragment-p)
	     ;; Avoid literal example.
	     (org-in-verbatim-emphasis)
	     (save-excursion
	       (beginning-of-line)
	       (looking-at "[ \t]*:[ \t]+"))
	     ;; Avoid cited text and headers in message-mode.
	     (and (derived-mode-p 'message-mode)
		  (or (save-excursion
			(beginning-of-line)
			(looking-at message-cite-prefix-regexp))
		      (message-point-in-header-p)))
	     ;; Avoid forbidden blocks.
	     (org-in-block-p org-footnote-forbidden-blocks)))))

(defun org-footnote-at-reference-p ()
  "Is the cursor at a footnote reference?

If so, return a list containing its label, beginning and ending
positions, and the definition, when inlined."
  (when (and (org-footnote-in-valid-context-p)
	     (or (looking-at org-footnote-re)
		 (org-in-regexp org-footnote-re)
		 (save-excursion (re-search-backward org-footnote-re nil t)))
	     (/= (match-beginning 0) (point-at-bol)))
    (let* ((beg (match-beginning 0))
	   (label (or (org-match-string-no-properties 2)
		      (org-match-string-no-properties 3)
		      ;; Anonymous footnotes don't have labels
		      (and (match-string 1)
			   (concat "fn:" (org-match-string-no-properties 1)))))
	   ;; Inline footnotes don't end at (match-end 0) as
	   ;; `org-footnote-re' stops just after the second colon.
	   ;; Find the real ending with `scan-sexps', so Org doesn't
	   ;; get fooled by unrelated closing square brackets.
	   (end (ignore-errors (scan-sexps beg 1))))
      ;; Point is really at a reference if it's located before true
      ;; ending of the footnote.
      (when (and end (< (point) end)
		 ;; Verify match isn't a part of a link.
		 (not (save-excursion
			(goto-char beg)
			(let ((linkp
			       (save-match-data
				 (org-in-regexp org-bracket-link-regexp))))
			  (and linkp (< (point) (cdr linkp))))))
		 ;; Verify point doesn't belong to a LaTeX macro.
		 (not (org-inside-latex-macro-p)))
	(list label beg end
	      ;; Definition: ensure this is an inline footnote first.
	      (and (or (not label) (match-string 1))
		   (org-trim (buffer-substring-no-properties
			      (match-end 0) (1- end)))))))))

(defun org-footnote-at-definition-p ()
  "Is point within a footnote definition?

This matches only pure definitions like [1] or [fn:name] at the
beginning of a line.  It does not match references like
\[fn:name:definition], where the footnote text is included and
defined locally.

The return value will be nil if not at a footnote definition, and
a list with label, start, end and definition of the footnote
otherwise."
  (when (save-excursion (beginning-of-line) (org-footnote-in-valid-context-p))
    (save-excursion
      (end-of-line)
      ;; Footnotes definitions are separated by new headlines, another
      ;; footnote definition or 2 blank lines.
      (let ((lim (save-excursion
		   (re-search-backward
		    (concat org-outline-regexp-bol
			    "\\|^\\([ \t]*\n\\)\\{2,\\}") nil t))))
	(when (re-search-backward org-footnote-definition-re lim t)
	  (let ((label (org-match-string-no-properties 1))
		(beg (match-beginning 0))
		(beg-def (match-end 0))
		;; In message-mode, do not search after signature.
		(end (let ((bound (and (derived-mode-p 'message-mode)
				       (save-excursion
					 (goto-char (point-max))
					 (re-search-backward
					  message-signature-separator nil t)))))
		       (if (progn
			     (end-of-line)
			     (re-search-forward
			      (concat org-outline-regexp-bol "\\|"
				      org-footnote-definition-re "\\|"
				      "^\\([ \t]*\n\\)\\{2,\\}") bound 'move))
			   (match-beginning 0)
			 (point)))))
	    (list label beg end
		  (org-trim (buffer-substring-no-properties beg-def end)))))))))

(defun org-footnote-get-next-reference (&optional label backward limit)
  "Return complete reference of the next footnote.

If LABEL is provided, get the next reference of that footnote.  If
BACKWARD is non-nil, find previous reference instead.  LIMIT is
the buffer position bounding the search.

Return value is a list like those provided by `org-footnote-at-reference-p'.
If no footnote is found, return nil."
  (save-excursion
    (let* ((label-fmt (if label (format "\\[%s[]:]" label) org-footnote-re)))
      (catch 'exit
	(while t
	  (unless (funcall (if backward #'re-search-backward #'re-search-forward)
			   label-fmt limit t)
	    (throw 'exit nil))
	  (unless backward (backward-char))
	  (let ((ref (org-footnote-at-reference-p)))
	    (when ref (throw 'exit ref))))))))

(defun org-footnote-next-reference-or-definition (limit)
  "Move point to next footnote reference or definition.

LIMIT is the buffer position bounding the search.

Return value is a list like those provided by
`org-footnote-at-reference-p' or `org-footnote-at-definition-p'.
If no footnote is found, return nil."
  (let* (ref (origin (point)))
    (catch 'exit
      (while t
	(unless (re-search-forward org-footnote-re limit t)
	  (goto-char origin)
	  (throw 'exit nil))
	;; Beware: with [1]-like footnotes point will be just after
	;; the closing square bracket.
	(backward-char)
	(cond
	 ((setq ref (org-footnote-at-reference-p))
	  (throw 'exit ref))
	 ;; Definition: also grab the last square bracket, only
	 ;; matched in `org-footnote-re' for [1]-like footnotes.
	 ((save-match-data (org-footnote-at-definition-p))
	  (let ((end (match-end 0)))
	    (throw 'exit
		   (list nil (match-beginning 0)
			 (if (eq (char-before end) 93) end (1+ end)))))))))))

(defun org-footnote-get-definition (label)
  "Return label, boundaries and definition of the footnote LABEL."
  (let* ((label (regexp-quote (org-footnote-normalize-label label)))
	 (re (format "^\\[%s\\]\\|.\\[%s:" label label)))
    (org-with-wide-buffer
     (goto-char (point-min))
     (catch 'found
       (while (re-search-forward re nil t)
	 (let* ((datum (progn (backward-char) (org-element-context)))
		(type (org-element-type datum)))
	   (when (memq type '(footnote-definition footnote-reference))
	     (throw 'found
		    (list
		     label
		     (org-element-property :begin datum)
		     (org-element-property :end datum)
		     (let ((cbeg (org-element-property :contents-begin datum)))
		       (if (not cbeg) ""
			 (replace-regexp-in-string
			  "[ \t\n]*\\'"
			  ""
			  (buffer-substring-no-properties
			   cbeg
			   (org-element-property :contents-end datum))))))))))
       nil))))

(defun org-footnote-goto-definition (label &optional location)
  "Move point to the definition of the footnote LABEL.

LOCATION, when non-nil specifies the buffer position of the
definition.

Throw an error if there is no definition or if it cannot be
reached from current narrowed part of buffer.  Return a non-nil
value if point was successfully moved."
  (interactive "sLabel: ")
  (let ((def-start (or location (nth 1 (org-footnote-get-definition label)))))
    (cond
     ((not def-start)
      (user-error "Cannot find definition of footnote %s" label))
     ((or (> def-start (point-max)) (< def-start (point-min)))
      (user-error "Definition is outside narrowed part of buffer")))
    (org-mark-ring-push)
    (goto-char def-start)
    (looking-at (format "\\[%s[]:] ?" label))
    (goto-char (match-end 0))
    (org-show-context 'link-search)
    (when (derived-mode-p 'org-mode)
      (message
       (substitute-command-keys
	"Edit definition and go back with `\\[org-mark-ring-goto]' or, if \
unique, with `\\[org-ctrl-c-ctrl-c]'.")))
    t))

(defun org-footnote-goto-previous-reference (label)
  "Find the first closest (to point) reference of footnote with label LABEL."
  (interactive "sLabel: ")
  (org-mark-ring-push)
  (let* ((label (org-footnote-normalize-label label)) ref)
    (save-excursion
      (setq ref (or (org-footnote-get-next-reference label t)
		    (org-footnote-get-next-reference label)
		    (save-restriction
		      (widen)
		      (or
		       (org-footnote-get-next-reference label t)
		       (org-footnote-get-next-reference label))))))
    (if (not ref)
	(error "Cannot find reference of footnote %s" label)
      (goto-char (nth 1 ref))
      (org-show-context 'link-search))))

(defun org-footnote-normalize-label (label)
  "Return LABEL as an appropriate string."
  (cond
   ((numberp label) (number-to-string label))
   ((equal "" label) nil)
   ((not (string-match "^[0-9]+$\\|^fn:" label))
    (concat "fn:" label))
   (t label)))

(defun org-footnote-all-labels (&optional with-defs)
  "Return list with all defined foot labels used in the buffer.

If WITH-DEFS is non-nil, also associate the definition to each
label.  The function will then return an alist whose key is label
and value definition."
  (let* (rtn
	 (push-to-rtn
	  (function
	   ;; Depending on WITH-DEFS, store label or (label . def) of
	   ;; footnote reference/definition given as argument in RTN.
	   (lambda (el)
	     (let ((lbl (car el)))
	       (push (if with-defs (cons lbl (nth 3 el)) lbl) rtn))))))
    (save-excursion
      (save-restriction
	(widen)
	;; Find all labels found in definitions.
	(goto-char (point-min))
	(let (def)
	  (while (re-search-forward org-footnote-definition-re nil t)
	    (when (setq def (org-footnote-at-definition-p))
	      (funcall push-to-rtn def))))
	;; Find all labels found in references.
	(goto-char (point-min))
	(let (ref)
	  (while (setq ref (org-footnote-get-next-reference))
	    (goto-char (nth 2 ref))
	    (and (car ref)		; ignore anonymous footnotes
		 (not (funcall (if with-defs #'assoc #'member) (car ref) rtn))
		 (funcall push-to-rtn ref))))))
    rtn))

(defun org-footnote-unique-label (&optional current)
  "Return a new unique footnote label.

The function returns the first \"fn:N\" or \"N\" label that is
currently not used.

Optional argument CURRENT is the list of labels active in the
buffer."
  (unless current (setq current (org-footnote-all-labels)))
  (let ((fmt (if (eq org-footnote-auto-label 'plain) "%d" "fn:%d"))
	(cnt 1))
    (while (member (format fmt cnt) current)
      (incf cnt))
    (format fmt cnt)))

(defun org-footnote--allow-reference-p ()
  "Non-nil when a footnote reference can be inserted at point."
  ;; XXX: This is similar to `org-footnote-in-valid-context-p' but
  ;; more accurate and usually faster, except in some corner cases.
  ;; It may replace it after doing proper benchmarks as it would be
  ;; used in fontification.
  (unless (bolp)
    (let* ((context (org-element-context))
	   (type (org-element-type context)))
      (cond
       ;; No footnote reference in attributes.
       ((let ((post (org-element-property :post-affiliated context)))
	  (and post (< (point) post)))
	nil)
       ;; Paragraphs and blank lines at top of document are fine.
       ((memq type '(nil paragraph)))
       ;; So are contents of verse blocks.
       ((eq type 'verse-block)
	(and (>= (point) (org-element-property :contents-begin context))
	     (< (point) (org-element-property :contents-end context))))
       ;; In an headline or inlinetask, point must be either on the
       ;; heading itself or on the blank lines below.
       ((memq type '(headline inlinetask))
	(or (not (org-at-heading-p))
	    (and (save-excursion (beginning-of-line)
				 (and (let ((case-fold-search t))
					(not (looking-at "\\*+ END[ \t]*$")))
				      (looking-at org-complex-heading-regexp)))
		 (match-beginning 4)
		 (>= (point) (match-beginning 4))
		 (or (not (match-beginning 5))
		     (< (point) (match-beginning 5))))))
       ;; White spaces after an object or blank lines after an element
       ;; are OK.
       ((>= (point)
	    (save-excursion (goto-char (org-element-property :end context))
			    (skip-chars-backward " \r\t\n")
			    (if (memq type org-element-all-objects) (point)
			      (1+ (line-beginning-position 2))))))
       ;; Other elements are invalid.
       ((memq type org-element-all-elements) nil)
       ;; Just before object is fine.
       ((= (point) (org-element-property :begin context)))
       ;; Within recursive object too, but not in a link.
       ((eq type 'link) nil)
       ((let ((cbeg (org-element-property :contents-begin context))
	      (cend (org-element-property :contents-end context)))
	  (and cbeg (>= (point) cbeg) (<= (point) cend))))))))

(defun org-footnote-new ()
  "Insert a new footnote.
This command prompts for a label.  If this is a label referencing an
existing label, only insert the label.  If the footnote label is empty
or new, let the user edit the definition of the footnote."
  (interactive)
  (unless (org-footnote--allow-reference-p)
    (user-error "Cannot insert a footnote here"))
  (let* ((all (org-footnote-all-labels))
	 (label
	  (org-footnote-normalize-label
	   (if (eq org-footnote-auto-label 'random)
	       (format "fn:%x" (random most-positive-fixnum))
	     (let ((propose (org-footnote-unique-label all)))
	       (if (memq org-footnote-auto-label '(t plain)) propose
		 (org-icompleting-read
		  "Label (leave empty for anonymous): "
		  (mapcar #'list all) nil nil
		  (and (eq org-footnote-auto-label 'confirm) propose))))))))
    (cond ((not label)
	   (insert "[fn::]")
	   (backward-char 1))
	  ((member label all)
	   (insert "[" label "]")
	   (message "New reference to existing note"))
	  (org-footnote-define-inline
	   (insert "[" label ":]")
	   (backward-char 1)
	   (org-footnote-auto-adjust-maybe))
	  (t
	   (insert "[" label "]")
	   (let ((p (org-footnote-create-definition label)))
	     ;; `org-footnote-goto-definition' needs to be called
	     ;; after `org-footnote-auto-adjust-maybe'.  Otherwise
	     ;; both label and location of the definition are lost.
	     ;; On the contrary, it needs to be called before
	     ;; `org-edit-footnote-reference' so that the remote
	     ;; editing buffer can display the correct label.
	     (if (ignore-errors (org-footnote-goto-definition label p))
		 (org-footnote-auto-adjust-maybe)
	       ;; Definition was created outside current scope: edit
	       ;; it remotely.
	       (org-footnote-auto-adjust-maybe)
	       (org-edit-footnote-reference)))))))

(defvar org-blank-before-new-entry) ; Silence byte-compiler.
(defun org-footnote-create-definition (label)
  "Start the definition of a footnote with label LABEL.
Return buffer position at the beginning of the definition.  In an
Org buffer, this function doesn't move point."
  (let ((label (org-footnote-normalize-label label))
	electric-indent-mode)		; Prevent wrong indentation.
    (cond
     ;; In an Org document.
     ((derived-mode-p 'org-mode)
      ;; If `org-footnote-section' is defined, find it, or create it
      ;; at the end of the buffer.
      (org-with-wide-buffer
       (cond
	((not org-footnote-section)
	 (org-footnote--goto-local-insertion-point))
	((save-excursion
	   (goto-char (point-min))
	   (re-search-forward
	    (concat "^\\*+[ \t]+" (regexp-quote org-footnote-section) "[ \t]*$")
	    nil t))
	 (goto-char (match-end 0))
	 (forward-line)
	 (unless (bolp) (insert "\n")))
	(t
	 (goto-char (point-max))
	 (unless (bolp) (insert "\n"))
	 ;; Insert new section.  Separate it from the previous one
	 ;; with a blank line, unless `org-blank-before-new-entry'
	 ;; explicitly says no.
	 (when (and (cdr (assq 'heading org-blank-before-new-entry))
		    (zerop (save-excursion (org-back-over-empty-lines))))
	   (insert "\n"))
	 (insert "* " org-footnote-section "\n")))
       (when (zerop (org-back-over-empty-lines)) (insert "\n"))
       (insert "[" label "] \n")
       (line-beginning-position 0)))
     (t
      ;; In a non-Org file.  Search for footnote tag, or create it if
      ;; specified (at the end of buffer, or before signature if in
      ;; Message mode).  Set point after any definition already there.
      (let ((tag (and org-footnote-tag-for-non-org-mode-files
		      (concat "^" (regexp-quote
				   org-footnote-tag-for-non-org-mode-files)
			      "[ \t]*$")))
	    (max (if (and (derived-mode-p 'message-mode)
			  (goto-char (point-max))
			  (re-search-backward
			   message-signature-separator nil t))
		     (progn
		       ;; Ensure one blank line separates last
		       ;; footnote from signature.
		       (beginning-of-line)
		       (open-line 2)
		       (point-marker))
		   (point-max-marker))))
	(set-marker-insertion-type max t)
	(goto-char max)
	;; Check if the footnote tag is defined but missing.  In this
	;; case, insert it, before any footnote or one blank line
	;; after any previous text.
	(when (and tag (not (re-search-backward tag nil t)))
	  (skip-chars-backward " \t\r\n")
	  (while (re-search-backward org-footnote-definition-re nil t))
	  (unless (bolp) (newline 2))
	  (insert org-footnote-tag-for-non-org-mode-files "\n\n"))
	;; Remove superfluous white space and clear marker.
	(goto-char max)
	(skip-chars-backward " \t\r\n")
	(delete-region (point) max)
	(unless (bolp) (newline))
	(set-marker max nil))
      (when (zerop (org-back-over-empty-lines)) (insert "\n"))
      (insert "[" label "] \n")
      (backward-char)
      (line-beginning-position)))))

;;;###autoload
(defun org-footnote-action (&optional special)
  "Do the right thing for footnotes.

When at a footnote reference, jump to the definition.

When at a definition, jump to the references if they exist, offer
to create them otherwise.

When neither at definition or reference, create a new footnote,
interactively if possible.

With prefix arg SPECIAL, or when no footnote can be created,
offer additional commands in a menu."
  (interactive "P")
  (let* ((context (and (not special) (org-element-context)))
	 (type (org-element-type context)))
    (cond
     ;; On white space after element, insert a new footnote.
     ((and context
	   (> (point)
	      (save-excursion
		(goto-char (org-element-property :end context))
		(skip-chars-backward " \t")
		(point))))
      (org-footnote-new))
     ((eq type 'footnote-reference)
      (let ((label (org-element-property :label context)))
	(cond
	 ;; Anonymous footnote: move point at the beginning of its
	 ;; definition.
	 ((not label)
	  (goto-char (org-element-property :contents-begin context)))
	 ;; Check if a definition exists: then move to it.
	 ((let ((p (nth 1 (org-footnote-get-definition label))))
	    (when p (org-footnote-goto-definition label p))))
	 ;; No definition exists: offer to create it.
	 ((yes-or-no-p (format "No definition for %s.  Create one? " label))
	  (let ((p (org-footnote-create-definition label)))
	    (or (ignore-errors (org-footnote-goto-definition label p))
		;; Since definition was created outside current scope,
		;; edit it remotely.
		(org-edit-footnote-reference)))))))
     ((eq type 'footnote-definition)
      (org-footnote-goto-previous-reference
       (org-element-property :label context)))
     ((or special (not (org-footnote--allow-reference-p)))
      (message "Footnotes: [s]ort  |  [r]enumber fn:N  |  [S]=r+s  |  \
->[n]umeric  |  [d]elete")
      (let ((c (read-char-exclusive)))
	(cond
	 ((eq c ?s) (org-footnote-normalize 'sort))
	 ((eq c ?r) (org-footnote-renumber-fn:N))
	 ((eq c ?S)
	  (org-footnote-renumber-fn:N)
	  (org-footnote-normalize 'sort))
	 ((eq c ?n) (org-footnote-normalize))
	 ((eq c ?d) (org-footnote-delete))
	 (t (error "No such footnote command %c" c)))))
     (t (org-footnote-new)))))

;;;###autoload
(defun org-footnote-normalize (&optional sort-only)
  "Collect the footnotes in various formats and normalize them.

This finds the different sorts of footnotes allowed in Org, and
normalizes them to the usual [N] format.

When SORT-ONLY is set, only sort the footnote definitions into the
referenced sequence."
  ;; This is based on Paul's function, but rewritten.
  ;;
  ;; Re-create `org-with-limited-levels', but not limited to Org
  ;; buffers.
  (let* ((limit-level
	  (and (boundp 'org-inlinetask-min-level)
	       org-inlinetask-min-level
	       (1- org-inlinetask-min-level)))
	 (nstars (and limit-level
		      (if org-odd-levels-only (1- (* limit-level 2))
			limit-level)))
	 (org-outline-regexp
	  (concat "\\*" (if nstars (format "\\{1,%d\\} " nstars) "+ ")))
	 (count 0)
	 ins-point ref ref-table)
    (org-with-wide-buffer
     ;; 1. Find every footnote reference, extract the definition, and
     ;;    collect that data in REF-TABLE.  If SORT-ONLY is nil, also
     ;;    normalize references.
     (goto-char (point-min))
     (while (setq ref (org-footnote-get-next-reference))
       (let* ((lbl (car ref))
	      (pos (nth 1 ref))
	      ;; When footnote isn't anonymous, check if it's label
	      ;; (REF) is already stored in REF-TABLE.  In that case,
	      ;; extract number used to identify it (MARKER).  If
	      ;; footnote is unknown, increment the global counter
	      ;; (COUNT) to create an unused identifier.
	      (a (and lbl (assoc lbl ref-table)))
	      (marker (or (nth 1 a) (incf count)))
	      ;; Is the reference inline or pointing to an inline
	      ;; footnote?
	      (inlinep (or (stringp (nth 3 ref)) (nth 3 a))))
	 ;; Replace footnote reference with [MARKER].  Maybe fill
	 ;; paragraph once done.  If SORT-ONLY is non-nil, only move
	 ;; to the end of reference found to avoid matching it twice.
	 (if sort-only (goto-char (nth 2 ref))
	   (delete-region (nth 1 ref) (nth 2 ref))
	   (goto-char (nth 1 ref))
	   (insert (format "[%d]" marker))
	   (and inlinep
		org-footnote-fill-after-inline-note-extraction
		(org-fill-paragraph)))
	 ;; Add label (REF), identifier (MARKER), definition (DEF)
	 ;; type (INLINEP) and position (POS) to REF-TABLE if data was
	 ;; unknown.
	 (unless a
	   (let ((def (or (nth 3 ref)	; Inline definition.
			  (nth 3 (org-footnote-get-definition lbl)))))
	     (push (list lbl marker def
			 ;; Reference beginning position is a marker
			 ;; to preserve it during further buffer
			 ;; modifications.
			 inlinep (copy-marker pos)) ref-table)))))
     ;; 2. Find and remove the footnote section, if any.  Also
     ;;    determine where footnotes shall be inserted (INS-POINT).
     (cond
      ((and org-footnote-section (derived-mode-p 'org-mode))
       (goto-char (point-min))
       (if (re-search-forward
	    (concat "^\\*[ \t]+" (regexp-quote org-footnote-section)
		    "[ \t]*$") nil t)
	   (delete-region (match-beginning 0) (org-end-of-subtree t t)))
       ;; A new footnote section is inserted by default at the end of
       ;; the buffer.
       (goto-char (point-max))
       (skip-chars-backward " \r\t\n")
       (forward-line)
       (unless (bolp) (newline)))
      ;; No footnote section set: Footnotes will be added at the end
      ;; of the section containing their first reference.
      ((derived-mode-p 'org-mode))
      (t
       ;; Remove any left-over tag in the buffer, if one is set up.
       (when org-footnote-tag-for-non-org-mode-files
	 (let ((tag (concat "^" (regexp-quote
				 org-footnote-tag-for-non-org-mode-files)
			    "[ \t]*$")))
	   (goto-char (point-min))
	   (while (re-search-forward tag nil t)
	     (replace-match "")
	     (delete-region (point) (progn (forward-line) (point))))))
       ;; In Message mode, ensure footnotes are inserted before the
       ;; signature.
       (if (and (derived-mode-p 'message-mode)
		(goto-char (point-max))
		(re-search-backward message-signature-separator nil t))
	   (beginning-of-line)
	 (goto-char (point-max)))))
     (setq ins-point (point-marker))
     ;; 3. Clean-up REF-TABLE.
     (setq ref-table
	   (delq nil
		 (mapcar
		  (lambda (x)
		    (cond
		     ;; When only sorting, ignore inline footnotes.
		     ;; Also clear position marker.
		     ((and sort-only (nth 3 x))
		      (set-marker (nth 4 x) nil) nil)
		     ;; No definition available: provide one.
		     ((not (nth 2 x))
		      (append
		       (list (car x) (nth 1 x)
			     (format "DEFINITION NOT FOUND: %s" (car x)))
		       (nthcdr 3 x)))
		     (t x)))
		  ref-table)))
     (setq ref-table (nreverse ref-table))
     ;; 4. Remove left-over definitions in the buffer.
     (dolist (x ref-table)
       (unless (nth 3 x) (org-footnote-delete-definitions (car x))))
     ;; 5. Insert the footnotes again in the buffer, at the
     ;;    appropriate spot.
     (goto-char ins-point)
     (cond
      ;; No footnote: exit.
      ((not ref-table))
      ;; Cases when footnotes should be inserted in one place.
      ((or (not (derived-mode-p 'org-mode)) org-footnote-section)
       ;; Insert again the section title, if any.  Ensure that title,
       ;; or the subsequent footnotes, will be separated by a blank
       ;; lines from the rest of the document.  In an Org buffer,
       ;; separate section with a blank line, unless explicitly stated
       ;; in `org-blank-before-new-entry'.
       (if (not (derived-mode-p 'org-mode))
	   (progn (skip-chars-backward " \t\n\r")
		  (delete-region (point) ins-point)
		  (unless (bolp) (newline))
		  (when org-footnote-tag-for-non-org-mode-files
		    (insert "\n" org-footnote-tag-for-non-org-mode-files "\n")))
	 (when (and (cdr (assq 'heading org-blank-before-new-entry))
		    (zerop (save-excursion (org-back-over-empty-lines))))
	   (insert "\n"))
	 (insert "* " org-footnote-section "\n"))
       (set-marker ins-point nil)
       ;; Insert the footnotes, separated by a blank line.
       (insert
	(mapconcat
	 (lambda (x)
	   ;; Clean markers.
	   (set-marker (nth 4 x) nil)
	   (format "\n[%s] %s" (nth (if sort-only 0 1) x) (nth 2 x)))
	 ref-table "\n"))
       (unless (eobp) (insert "\n\n")))
      ;; Each footnote definition has to be inserted at the end of the
      ;; section where its first reference belongs.
      (t
       (dolist (x ref-table)
	 (let ((pos (nth 4 x)))
	   (goto-char pos)
	   ;; Clean marker.
	   (set-marker pos nil))
	 (org-footnote--goto-local-insertion-point)
	 (insert (format "\n[%s] %s\n"
			 (nth (if sort-only 0 1) x)
			 (nth 2 x)))))))))

(defun org-footnote--goto-local-insertion-point ()
  "Find insertion point for footnote, just before next outline heading.
Assume insertion point is within currently accessible part of the buffer."
  (org-with-limited-levels (outline-next-heading))
  ;; Skip file local variables.  See `modify-file-local-variable'.
  (when (eobp)
    (let ((case-fold-search t))
      (re-search-backward "^[ \t]*# +Local Variables:"
			  (max (- (point-max) 3000) (point-min))
			  t)))
  (skip-chars-backward " \t\n")
  (forward-line)
  (unless (bolp) (insert "\n")))

(defun org-footnote-delete-references (label)
  "Delete every reference to footnote LABEL.
Return the number of footnotes removed."
  (save-excursion
    (goto-char (point-min))
    (let (ref (nref 0))
      (while (setq ref (org-footnote-get-next-reference label))
	(goto-char (nth 1 ref))
	(delete-region (nth 1 ref) (nth 2 ref))
	(incf nref))
      nref)))

(defun org-footnote-delete-definitions (label)
  "Delete every definition of the footnote LABEL.
Return the number of footnotes removed."
  (save-excursion
    (goto-char (point-min))
    (let ((def-re (concat "^\\[" (regexp-quote label) "\\]"))
	  (ndef 0))
      (while (re-search-forward def-re nil t)
	(let ((full-def (org-footnote-at-definition-p)))
	  (when full-def
	    ;; Remove the footnote, and all blank lines before it.
	    (goto-char (nth 1 full-def))
	    (skip-chars-backward " \r\t\n")
	    (unless (bolp) (forward-line))
	    (delete-region (point) (nth 2 full-def))
	    (incf ndef))))
      ndef)))

(defun org-footnote-delete (&optional label)
  "Delete the footnote at point.
This will remove the definition (even multiple definitions if they exist)
and all references of a footnote label.

If LABEL is non-nil, delete that footnote instead."
  (catch 'done
    (let* ((nref 0) (ndef 0) x
	   ;; 1. Determine LABEL of footnote at point.
	   (label (cond
		   ;; LABEL is provided as argument.
		   (label)
		   ;; Footnote reference at point.  If the footnote is
		   ;; anonymous, delete it and exit instead.
		   ((setq x (org-footnote-at-reference-p))
		    (or (car x)
			(progn
			  (delete-region (nth 1 x) (nth 2 x))
			  (message "Anonymous footnote removed")
			  (throw 'done t))))
		   ;; Footnote definition at point.
		   ((setq x (org-footnote-at-definition-p))
		    (car x))
		   (t (error "Don't know which footnote to remove")))))
      ;; 2. Now that LABEL is non-nil, find every reference and every
      ;; definition, and delete them.
      (setq nref (org-footnote-delete-references label)
	    ndef (org-footnote-delete-definitions label))
      ;; 3. Verify consistency of footnotes and notify user.
      (org-footnote-auto-adjust-maybe)
      (message "%d definition(s) of and %d reference(s) of footnote %s removed"
	       ndef nref label))))

(defun org-footnote-renumber-fn:N ()
  "Renumber the simple footnotes like fn:17 into a sequence in the document."
  (interactive)
  (let (map (n 0))
    (org-with-wide-buffer
     (goto-char (point-min))
     (while (re-search-forward "\\[fn:\\([0-9]+\\)[]:]" nil t)
       (save-excursion
	 (goto-char (match-beginning 0))
	 ;; Ensure match is a footnote reference or definition.
	 (when (save-match-data (if (bolp)
				    (org-footnote-at-definition-p)
				  (org-footnote-at-reference-p)))
	   (let ((new-val (or (cdr (assoc (match-string 1) map))
			      (number-to-string (incf n)))))
	     (unless (assoc (match-string 1) map)
	       (push (cons (match-string 1) new-val) map))
	     (replace-match new-val nil nil nil 1))))))))

(defun org-footnote-auto-adjust-maybe ()
  "Renumber and/or sort footnotes according to user settings."
  (when (memq org-footnote-auto-adjust '(t renumber))
    (org-footnote-renumber-fn:N))
  (when (memq org-footnote-auto-adjust '(t sort))
    (let ((label (car (org-footnote-at-definition-p))))
      (org-footnote-normalize 'sort)
      (when label
	(goto-char (point-min))
	(and (re-search-forward (concat "^\\[" (regexp-quote label) "\\]")
				nil t)
	     (progn (insert " ")
		    (just-one-space)))))))

(provide 'org-footnote)

;; Local variables:
;; generated-autoload-file: "org-loaddefs.el"
;; End:

;;; org-footnote.el ends here