unofficial mirror of bug-gnu-emacs@gnu.org 
 help / color / mirror / code / Atom feed
blob 7874a4af197313d8acc2a020c206ad9e045d7e97 38287 bytes (raw)
name: lisp/org-footnote.el 	 # note: path name is non-authoritative(*)

   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
 991
 992
 993
 994
 995
 996
 997
 998
 999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
 
;;; org-footnote.el --- Footnote support in Org      -*- lexical-binding: t; -*-
;;
;; Copyright (C) 2009-2023 Free Software Foundation, Inc.
;;
;; Author: Carsten Dominik <carsten.dominik@gmail.com>
;; Keywords: outlines, hypermedia, calendar, wp
;; URL: https://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 <https://www.gnu.org/licenses/>.
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;
;;; Commentary:

;; This file contains the code dealing with footnotes in Org mode.

;;; Code:

(require 'org-load)
(org-assert-version)

;;;; Declarations

(require 'cl-lib)
(require 'org-macs)
(require 'org-compat)

(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-end-of-meta-data "org" (&optional full))
(declare-function org-edit-footnote-reference "org-src" ())
(declare-function org-element-at-point "org-element" (&optional pom cached-only))
(declare-function org-element-class "org-element" (datum &optional parent))
(declare-function org-element-context "org-element" (&optional element))
(declare-function org-element-lineage "org-element" (blob &optional types with-self))
(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 region))
(declare-function org-in-block-p "org" (names))
(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-fold-show-context "org-fold" (&optional key))
(declare-function outline-next-heading "outline")

(defvar electric-indent-mode)
(defvar org-blank-before-new-entry)	; defined in org.el
(defvar org-link-bracket-re)	; defined in org.el
(defvar org-complex-heading-regexp)	; defined in org.el
(defvar org-odd-levels-only)		; defined in org.el
(defvar org-outline-regexp)		; defined in org.el
(defvar org-outline-regexp-bol)		; defined in org.el

\f
;;;; Constants

(defconst org-footnote-re
  "\\[fn:\\(?:\\(?1:[-_[:word:]]+\\)?\\(:\\)\\|\\(?1:[-_[:word:]]+\\)\\]\\)"
  "Regular expression for matching footnotes.
Match group 1 contains footnote's label.  It is nil for anonymous
footnotes.  Match group 2 is non-nil only when footnote is
inline, i.e., it contains its own definition.")

(defconst org-footnote-definition-re "^\\[fn:\\([-_[:word:]]+\\)\\]"
  "Regular expression matching the definition of a footnote.
Match group 1 contains definition's label.")

(defconst org-footnote-forbidden-blocks '("comment" "example" "export" "src")
  "Names of blocks where footnotes are not allowed.")

\f
;;;; Customization

(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.  It can also be a string representing 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-default-toplevel-value 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))
  :safe #'string-or-null-p)

(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
  :safe #'booleanp)

(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."
  :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))
  :safe #'symbolp)

(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))
  :safe #'symbolp)

(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
  :safe #'booleanp)

\f
;;;; Predicates

(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 forbidden blocks.
	     (org-in-block-p org-footnote-forbidden-blocks)))))

(defun org-footnote-at-reference-p ()
  "Non-nil if point is at a footnote reference.
If so, return a list containing its label, beginning and ending
positions, and the definition, when inline."
  (let ((reference (org-element-context)))
    (when (eq 'footnote-reference (org-element-type reference))
      (let ((end (save-excursion
		   (goto-char (org-element-property :end reference))
		   (skip-chars-backward " \t")
		   (point))))
	(when (< (point) end)
	  (list (org-element-property :label reference)
		(org-element-property :begin reference)
		end
		(and (eq 'inline (org-element-property :type reference))
		     (buffer-substring-no-properties
		      (org-element-property :contents-begin reference)
		      (org-element-property :contents-end
					    reference)))))))))

(defun org-footnote-at-definition-p ()
  "Non-nil if point is within a footnote definition.

This matches only pure definitions like [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 is nil if not at a footnote definition, and
a list with label, start, end and definition of the footnote
otherwise."
  (pcase (org-element-lineage (org-element-at-point) '(footnote-definition) t)
    (`nil nil)
    (definition
      (let* ((label (org-element-property :label definition))
	     (begin (org-element-property :post-affiliated definition))
	     (end (save-excursion
		    (goto-char (org-element-property :end definition))
		    (skip-chars-backward " \r\t\n")
		    (line-beginning-position 2)))
	     (contents-begin (org-element-property :contents-begin definition))
	     (contents-end (org-element-property :contents-end definition))
	     (contents
	      (if (not contents-begin) ""
		(org-trim
		 (buffer-substring-no-properties contents-begin
						 contents-end)))))
	(list label begin end contents)))))

\f
;;;; Internal functions

(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-p "\\*+ END[ \t]*$")))
			(let ((case-fold-search nil))
			  (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 (eq (org-element-class context) 'object) (point)
			      (line-beginning-position 2)))))
       ;; At the beginning of a footnote definition, right after the
       ;; label, is OK.
       ((eq type 'footnote-definition) (looking-at (rx space)))
       ;; Other elements are invalid.
       ((eq (org-element-class context) 'element) 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)
       ((eq type 'table-cell)
        ;; :contents-begin is not reliable on empty cells, so special
        ;; case it.
        (<= (save-excursion (skip-chars-backward " \t") (point))
            (org-element-property :contents-end context)))
       ((let ((cbeg (org-element-property :contents-begin context))
	      (cend (org-element-property :contents-end context)))
	  (and cbeg (>= (point) cbeg) (<= (point) cend))))))))

(defun org-footnote--clear-footnote-section ()
  "Remove all footnote sections in buffer and create a new one.
New section is created at the end of the buffer.  Leave point
within the new section."
  (when org-footnote-section
    (goto-char (point-min))
    (let ((regexp (format "^\\*+ +%s[ \t]*$"
			  (regexp-quote org-footnote-section))))
      (while (re-search-forward regexp nil t)
	(delete-region
	 (match-beginning 0)
	 (org-end-of-subtree t t))))
    (goto-char (point-max))
    ;; Clean-up blank lines at the end of the buffer.
    (skip-chars-backward " \r\t\n")
    (unless (bobp)
      (forward-line)
      (when (eolp) (insert "\n")))
    (delete-region (point) (point-max))
    (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")))

(defun org-footnote--set-label (label)
  "Set label of footnote at point to string LABEL.
Assume point is at the beginning of the reference or definition
to rename."
  (forward-char 4)
  (cond ((eq (char-after) ?:) (insert label))
	((looking-at "\\([-_[:word:]]+\\)") (replace-match label nil nil nil 1))
	(t nil)))

(defun org-footnote--collect-references (&optional anonymous)
  "Collect all labeled footnote references in current buffer.

Return an alist where associations follow the pattern

  (LABEL MARKER TOP-LEVEL SIZE)

with

  LABEL     the label of the of the definition,
  MARKER    a marker pointing to its beginning,
  TOP-LEVEL a boolean, nil when the footnote is contained within
            another one,
  SIZE      the length of the inline definition, in characters,
            or nil for non-inline references.

When optional ANONYMOUS is non-nil, also collect anonymous
references.  In such cases, LABEL is nil.

References are sorted according to a deep-reading order."
  (org-with-wide-buffer
   (goto-char (point-min))
   (let ((regexp (if anonymous org-footnote-re "\\[fn:[-_[:word:]]+[]:]"))
	 references nested)
     (save-excursion
       (while (re-search-forward regexp nil t)
	 ;; Ignore definitions.
	 (unless (and (eq (char-before) ?\])
		      (= (line-beginning-position) (match-beginning 0)))
	   ;; Ensure point is within the reference before parsing it.
	   (backward-char)
	   (let ((object (org-element-context)))
	     (when (eq (org-element-type object) 'footnote-reference)
	       (let* ((label (org-element-property :label object))
		      (begin (org-element-property :begin object))
		      (size
		       (and (eq (org-element-property :type object) 'inline)
			    (- (org-element-property :contents-end object)
			       (org-element-property :contents-begin object)))))
		 (let ((d (org-element-lineage object '(footnote-definition))))
		   (push (list label (copy-marker begin) (not d) size)
			 references)
		   (when d
		     ;; Nested references are stored in alist NESTED.
		     ;; Associations there follow the pattern
		     ;;
		     ;;   (DEFINITION-LABEL . REFERENCES)
		     (let* ((def-label (org-element-property :label d))
			    (labels (assoc def-label nested)))
		       (if labels (push label (cdr labels))
			 (push (list def-label label) nested)))))))))))
     ;; Sort the list of references.  Nested footnotes have priority
     ;; over top-level ones.
     (letrec ((ordered nil)
	      (add-reference
	       (lambda (ref allow-nested)
		 (when (or allow-nested (nth 2 ref))
		   (push ref ordered)
		   (dolist (r (mapcar (lambda (l) (assoc l references))
				      (reverse
				       (cdr (assoc (nth 0 ref) nested)))))
		     (funcall add-reference r t))))))
       (dolist (r (reverse references) (nreverse ordered))
	 (funcall add-reference r nil))))))

(defun org-footnote--collect-definitions (&optional delete)
  "Collect all footnote definitions in current buffer.

Return an alist where associations follow the pattern

  (LABEL . DEFINITION)

with LABEL and DEFINITION being, respectively, the label and the
definition of the footnote, as strings.

When optional argument DELETE is non-nil, delete the definition
while collecting them."
  (org-with-wide-buffer
   (goto-char (point-min))
   (let (definitions seen)
     (while (re-search-forward org-footnote-definition-re nil t)
       (backward-char)
       (let ((element (org-element-at-point)))
	 (let ((label (org-element-property :label element)))
	   (when (and (eq (org-element-type element) 'footnote-definition)
		      (not (member label seen)))
	     (push label seen)
	     (let* ((beg (progn
			   (goto-char (org-element-property :begin element))
			   (skip-chars-backward " \r\t\n")
			   (if (bobp) (point) (line-beginning-position 2))))
		    (end (progn
			   (goto-char (org-element-property :end element))
			   (skip-chars-backward " \r\t\n")
			   (line-beginning-position 2)))
		    (def (org-trim (buffer-substring-no-properties beg end))))
	       (push (cons label def) definitions)
	       (when delete (delete-region beg end)))))))
     definitions)))

(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-chars-backward " \t\n")
  (unless (bobp) (forward-line))
  (unless (bolp) (insert "\n")))

\f
;;;; Navigation

(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."
  (let ((label-regexp (if label (format "\\[fn:%s[]:]" label) org-footnote-re)))
    (catch :exit
      (save-excursion
	(while (funcall (if backward #'re-search-backward #'re-search-forward)
			label-regexp limit t)
	  (unless backward (backward-char))
	  (pcase (org-footnote-at-reference-p)
	    (`nil nil)
	    (reference (throw :exit reference))))))))

(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.

This function is meant to be used for fontification only."
  (let ((origin (point)))
    (catch 'exit
      (while t
	(unless (re-search-forward org-footnote-re limit t)
	  (goto-char origin)
	  (throw 'exit nil))
	;; Beware: with non-inline footnotes point will be just after
	;; the closing square bracket.
	(backward-char)
	(cond
	 ((and (/= (match-beginning 0) (line-beginning-position))
	       (let* ((beg (match-beginning 0))
		      (label (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))))
		 (and 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-link-bracket-re))))
			       (and linkp (< (point) (cdr linkp))))))
		      ;; Verify point doesn't belong to a LaTeX macro.
		      (not (org-inside-latex-macro-p))
		      (throw 'exit
			     (list label beg end
				   ;; Definition: ensure this is an
				   ;; inline footnote first.
				   (and (match-end 2)
					(org-trim
					 (buffer-substring-no-properties
					  (match-end 0) (1- end))))))))))
	 ;; Definition: also grab the last square bracket, matched in
	 ;; `org-footnote-re' for non-inline footnotes.
	 ((and (save-excursion
		 (beginning-of-line)
		 (save-match-data (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 ((end (match-end 0))
		       (lim (save-excursion
			      (re-search-backward
			       (concat org-outline-regexp-bol
				       "\\|^\\([ \t]*\n\\)\\{2,\\}")
			       nil t))))
		   (and (re-search-backward org-footnote-definition-re lim t)
			(throw 'exit
			       (list nil
				     (match-beginning 0)
				     (if (eq (char-before end) ?\]) end
				       (1+ end)))))))))
	 (t 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* ((label (org-footnote-normalize-label label))
	 (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 "\\[fn:%s[]:]" (regexp-quote label)))
    (goto-char (match-end 0))
    (org-fold-show-context 'link-search)
    (when (derived-mode-p 'org-mode)
      (message "%s" (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: ")
  (let* ((label (org-footnote-normalize-label label))
	 (reference
	  (save-excursion
	    (or (org-footnote-get-next-reference label t)
		(org-footnote-get-next-reference label)
		(and (buffer-narrowed-p)
		     (org-with-wide-buffer
		      (or (org-footnote-get-next-reference label t)
			  (org-footnote-get-next-reference label)))))))
	 (start (nth 1 reference)))
    (cond ((not reference)
	   (user-error "Cannot find reference of footnote %S" label))
	  ((or (> start (point-max)) (< start (point-min)))
	   (user-error "Reference is outside narrowed part of buffer")))
    (org-mark-ring-push)
    (goto-char start)
    (org-fold-show-context 'link-search)))

\f
;;;; Getters

(defun org-footnote-normalize-label (label)
  "Return LABEL without \"fn:\" prefix.
If LABEL is the empty string or constituted of white spaces only,
return nil instead."
  (pcase (org-trim label)
    ("" nil)
    ((pred (string-prefix-p "fn:")) (substring label 3))
    (_ label)))

(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 "^\\[fn:%s\\]\\|.\\[fn:%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-all-labels ()
  "List all defined footnote labels used throughout the buffer.
This function ignores narrowing, if any."
  (org-with-wide-buffer
   (goto-char (point-min))
   (let (all)
     (while (re-search-forward org-footnote-re nil t)
       (backward-char)
       (let ((context (org-element-context)))
	 (when (memq (org-element-type context)
		     '(footnote-definition footnote-reference))
	   (let ((label (org-element-property :label context)))
	     (when label (cl-pushnew label all :test #'equal))))))
     all)))

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

The function returns the first numeric label currently unused.

Optional argument CURRENT is the list of labels active in the
buffer."
  (let ((current (or current (org-footnote-all-labels))))
    (let ((count 1))
      (while (member (number-to-string count) current)
	(cl-incf count))
      (number-to-string count))))

\f
;;;; Adding, Deleting Footnotes

(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
	  (if (eq org-footnote-auto-label 'random)
	      (format "%x" (abs (random)))
	    (org-footnote-normalize-label
	     (let ((propose (org-footnote-unique-label all)))
	       (if (eq org-footnote-auto-label t) propose
		 (completing-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 "[fn:" label "]")
	   (message "New reference to existing note"))
	  (org-footnote-define-inline
	   (insert "[fn:" label ":]")
	   (backward-char 1)
	   (org-footnote-auto-adjust-maybe))
	  (t
	   (insert "[fn:" 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)))))))

(defun org-footnote-create-definition (label)
  "Start the definition of a footnote with label LABEL.
Return buffer position at the beginning of the definition.  This
function doesn't move point."
  (let ((label (org-footnote-normalize-label label))
	electric-indent-mode)		; Prevent wrong indentation.
    (org-preserve-local-variables
     (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))
        (org-end-of-meta-data t)
	(unless (bolp) (insert "\n")))
       (t (org-footnote--clear-footnote-section)))
      (when (zerop (org-back-over-empty-lines)) (insert "\n"))
      (insert "[fn:" label "] \n")
      (line-beginning-position 0)))))

(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))
	(cl-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 (format "^\\[fn:%s\\]" (regexp-quote label)))
	  (ndef 0))
      (while (re-search-forward def-re nil t)
	(pcase (org-footnote-at-definition-p)
	  (`(,_ ,start ,end ,_)
	   ;; Remove the footnote, and all blank lines before it.
	   (delete-region (progn
			    (goto-char start)
			    (skip-chars-backward " \r\t\n")
			    (if (bobp) (point) (line-beginning-position 2)))
			  (progn
			    (goto-char end)
			    (skip-chars-backward " \r\t\n")
			    (if (bobp) (point) (line-beginning-position 2))))
	   (cl-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
    (org-preserve-local-variables
     (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)))))

\f
;;;; Sorting, Renumbering, Normalizing

(defun org-footnote-renumber-fn:N ()
  "Order numbered footnotes into a sequence in the document."
  (interactive)
  (let* ((c 0)
	 (references (cl-remove-if-not
		      (lambda (r) (string-match-p "\\`[0-9]+\\'" (car r)))
		      (org-footnote--collect-references)))
	 (alist (mapcar (lambda (l) (cons l (number-to-string (cl-incf c))))
			(delete-dups (mapcar #'car references)))))
    (org-with-wide-buffer
     ;; Re-number references.
     (dolist (ref references)
       (goto-char (nth 1 ref))
       (org-footnote--set-label (cdr (assoc (nth 0 ref) alist))))
     ;; Re-number definitions.
     (goto-char (point-min))
     (while (re-search-forward "^\\[fn:\\([0-9]+\\)\\]" nil t)
       (replace-match (or (cdr (assoc (match-string 1) alist))
			  ;; Un-referenced definitions get higher
			  ;; numbers.
			  (number-to-string (cl-incf c)))
		      nil nil nil 1)))))

(defun org-footnote-sort ()
  "Rearrange footnote definitions in the current buffer.
Sort footnote definitions so they match order of footnote
references.  Also relocate definitions at the end of their
relative section or within a single footnote section, according
to `org-footnote-section'.  Inline definitions are ignored."
  (let ((references (org-footnote--collect-references)))
    (org-preserve-local-variables
     (let ((definitions (org-footnote--collect-definitions 'delete)))
       (org-with-wide-buffer
	(org-footnote--clear-footnote-section)
	;; Insert footnote definitions at the appropriate location,
	;; separated by a blank line.  Each definition is inserted
	;; only once throughout the buffer.
	(let (inserted)
	  (dolist (cell references)
	    (let ((label (car cell))
		  (nested (not (nth 2 cell)))
		  (inline (nth 3 cell)))
	      (unless (or (member label inserted) inline)
		(push label inserted)
		(unless (or org-footnote-section nested)
		  ;; If `org-footnote-section' is non-nil, or
		  ;; reference is nested, point is already at the
		  ;; correct position.  Otherwise, move at the
		  ;; appropriate location within the section
		  ;; containing the reference.
		  (goto-char (nth 1 cell))
		  (org-footnote--goto-local-insertion-point))
		(insert "\n"
			(or (cdr (assoc label definitions))
			    (format "[fn:%s] DEFINITION NOT FOUND." label))
			"\n"))))
	  ;; Insert un-referenced footnote definitions at the end.
          ;; Combine all insertions into one to create a single cache
          ;; update call.
          (org-combine-change-calls (point) (point)
	    (pcase-dolist (`(,label . ,definition) definitions)
	      (unless (member label inserted)
	        (insert "\n" definition "\n"))))))))))

(defun org-footnote-normalize ()
  "Turn every footnote in buffer into a numbered one."
  (interactive)
  (org-preserve-local-variables
   (let ((n 0)
	 (translations nil)
	 (definitions nil)
	 (references (org-footnote--collect-references 'anonymous)))
     (org-with-wide-buffer
      ;; Update label for reference.  We need to do this before
      ;; clearing definitions in order to rename nested footnotes
      ;; before they are deleted.
      (dolist (cell references)
	(let* ((label (car cell))
	       (anonymous (not label))
	       (new
		(cond
		 ;; In order to differentiate anonymous references
		 ;; from regular ones, set their labels to integers,
		 ;; not strings.
		 (anonymous (setcar cell (cl-incf n)))
		 ((cdr (assoc label translations)))
		 (t (let ((l (number-to-string (cl-incf n))))
		      (push (cons label l) translations)
		      l)))))
	  (goto-char (nth 1 cell))	; Move to reference's start.
	  (org-footnote--set-label
	   (if anonymous (number-to-string new) new))
	  (let ((size (nth 3 cell)))
	    ;; Transform inline footnotes into regular references and
	    ;; retain their definition for later insertion as
	    ;; a regular footnote definition.
	    (when size
	      (let ((def (concat
			  (format "[fn:%s] " new)
			  (org-trim
			   (substring
			    (delete-and-extract-region
			     (point) (+ (point) size 1))
			    1)))))
		(push (cons (if anonymous new label) def) definitions)
		(when org-footnote-fill-after-inline-note-extraction
		  (org-fill-paragraph)))))))
      ;; Collect definitions.  Update labels according to ALIST.
      (let ((definitions
	      (nconc definitions
		     (org-footnote--collect-definitions 'delete)))
	    (inserted))
	(org-footnote--clear-footnote-section)
	(dolist (cell references)
	  (let* ((label (car cell))
		 (anonymous (integerp label))
		 (pos (nth 1 cell)))
	    ;; Move to appropriate location, if required.  When there
	    ;; is a footnote section or reference is nested, point is
	    ;; already at the expected location.
	    (unless (or org-footnote-section (not (nth 2 cell)))
	      (goto-char pos)
	      (org-footnote--goto-local-insertion-point))
	    ;; Insert new definition once label is updated.
	    (unless (member label inserted)
	      (push label inserted)
	      (let ((stored (cdr (assoc label definitions)))
		    ;; Anonymous footnotes' label is already
		    ;; up-to-date.
		    (new (if anonymous label
			   (cdr (assoc label translations)))))
		(insert "\n"
			(cond
			 ((not stored)
			  (format "[fn:%s] DEFINITION NOT FOUND." new))
			 (anonymous stored)
			 (t
			  (replace-regexp-in-string
			   "\\`\\[fn:\\(.*?\\)\\]" new stored nil nil 1)))
			"\n")))))
	;; Insert un-referenced footnote definitions at the end.
	(pcase-dolist (`(,label . ,definition) definitions)
	  (unless (member label inserted)
	    (insert "\n"
		    (replace-regexp-in-string org-footnote-definition-re
					      (format "[fn:%d]" (cl-incf n))
					      definition)
		    "\n"))))))))

(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-sort)
      (when label
	(goto-char (point-min))
	(and (re-search-forward (format "^\\[fn:%s\\]" (regexp-quote label))
				nil t)
	     (progn (insert " ")
		    (just-one-space)))))))

\f
;;;; End-user interface

;;;###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]ormalize | \
\[d]elete")
      (pcase (read-char-exclusive)
	(?s (org-footnote-sort))
	(?r (org-footnote-renumber-fn:N))
	(?S (org-footnote-renumber-fn:N)
	    (org-footnote-sort))
	(?n (org-footnote-normalize))
	(?d (org-footnote-delete))
	(char (error "No such footnote command %c" char))))
     (t (org-footnote-new)))))


(provide 'org-footnote)

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

;;; org-footnote.el ends here

debug log:

solving 7874a4af1 ...
found 7874a4af1 in https://yhetil.org/emacs-bugs/871qi2mlnc.fsf@localhost/
found 6bdd0b32f in https://git.savannah.gnu.org/cgit/emacs.git
preparing index
index prepared:
100644 6bdd0b32fedef27639048ef57d9d5b0f557448c5	lisp/org-footnote.el

applying [1/1] https://yhetil.org/emacs-bugs/871qi2mlnc.fsf@localhost/
diff --git a/lisp/org-footnote.el b/lisp/org-footnote.el
index 6bdd0b32f..7874a4af1 100644

Checking patch lisp/org-footnote.el...
Applied patch lisp/org-footnote.el cleanly.

index at:
100644 7874a4af197313d8acc2a020c206ad9e045d7e97	lisp/org-footnote.el

(*) Git path names are given by the tree(s) the blob belongs to.
    Blobs themselves have no identifier aside from the hash of its contents.^

Code repositories for project(s) associated with this public inbox

	https://git.savannah.gnu.org/cgit/emacs.git

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).