emacs-orgmode@gnu.org archives
 help / color / mirror / code / Atom feed
blob acf7c076147af542178d42438f00b576a1858530 50080 bytes (raw)

   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
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
 
;;; org-fold.el --- Folding of Org entries -*- lexical-binding: t; -*-
;;
;; Copyright (C) 2020-2020 Free Software Foundation, Inc.
;;
;; Author: Ihor Radchenko <yantar92 at gmail dot com>
;; Keywords: folding, invisible text
;; Homepage: 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 code handling temporary invisibility (folding
;; and unfolding) of text in org buffers.

;; The folding is implemented using generic org-fold-core library.  This file
;; contains org-specific implementation of the folding.  Also, various
;; useful functions from org-fold-core are aliased under shorted `org-fold'
;; prefix.

;; The following features are implemented:
;; - Folding/unfolding various Org mode elements and regions of Org buffers:
;;   + Region before first heading;
;;   + Org headings, their text, children (subtree), siblings, parents, etc;
;;   + Org blocks and drawers
;; - Revealing Org structure around invisible point location
;; - Revealing folded Org elements broken by user edits

;;; Code:

(require 'org-macs)
(require 'org-fold-core)

(defvar org-inlinetask-min-level)
(defvar org-link--link-folding-spec)
(defvar org-link--description-folding-spec)
(defvar org-odd-levels-only)
(defvar org-drawer-regexp)
(defvar org-property-end-re)
(defvar org-link-descriptive)
(defvar org-outline-regexp-bol)
(defvar org-archive-tag)
(defvar org-custom-properties-overlays)

(declare-function isearch-filter-visible "isearch" (beg end))
(declare-function org-element-type "org-element" (element))
(declare-function org-element-at-point "org-element" (&optional pom cached-only))
(declare-function org-element-property "org-element" (property element))
(declare-function org-element--current-element "org-element" (limit &optional granularity mode structure))
(declare-function org-element--cache-active-p "org-element" ())
(declare-function org-toggle-custom-properties-visibility "org" ())
(declare-function org-item-re "org-list" ())
(declare-function org-up-heading-safe "org" ())
(declare-function org-get-tags "org" (&optional pos local fontify))
(declare-function org-get-valid-level "org" (level &optional change))
(declare-function org-before-first-heading-p "org" ())
(declare-function org-goto-sibling "org" (&optional previous))
(declare-function org-block-map "org" (function &optional start end))
(declare-function org-map-region "org" (fun beg end))
(declare-function org-end-of-subtree "org" (&optional invisible-ok to-heading))
(declare-function org-back-to-heading-or-point-min "org" (&optional invisible-ok))
(declare-function org-back-to-heading "org" (&optional invisible-ok))
(declare-function org-at-heading-p "org" (&optional invisible-not-ok))
(declare-function org-cycle-hide-drawers "org-cycle" (state))

(declare-function outline-show-branches "outline" ())
(declare-function outline-hide-sublevels "outline" (levels))
(declare-function outline-get-next-sibling "outline" ())
(declare-function outline-invisible-p "outline" (&optional pos))
(declare-function outline-next-heading "outline" ())

;;; Customization

(defgroup org-fold-reveal-location nil
  "Options about how to make context of a location visible."
  :tag "Org Reveal Location"
  :group 'org-structure)

(defcustom org-fold-show-context-detail '((agenda . local)
				  (bookmark-jump . lineage)
				  (isearch . lineage)
				  (default . ancestors))
  "Alist between context and visibility span when revealing a location.

\\<org-mode-map>Some actions may move point into invisible
locations.  As a consequence, Org always exposes a neighborhood
around point.  How much is shown depends on the initial action,
or context.  Valid contexts are

  agenda         when exposing an entry from the agenda
  org-goto       when using the command `org-goto' (`\\[org-goto]')
  occur-tree     when using the command `org-occur' (`\\[org-sparse-tree] /')
  tags-tree      when constructing a sparse tree based on tags matches
  link-search    when exposing search matches associated with a link
  mark-goto      when exposing the jump goal of a mark
  bookmark-jump  when exposing a bookmark location
  isearch        when exiting from an incremental search
  default        default for all contexts not set explicitly

Allowed visibility spans are

  minimal        show current headline; if point is not on headline,
                 also show entry

  local          show current headline, entry and next headline

  ancestors      show current headline and its direct ancestors; if
                 point is not on headline, also show entry

  ancestors-full show current subtree and its direct ancestors

  lineage        show current headline, its direct ancestors and all
                 their children; if point is not on headline, also show
                 entry and first child

  tree           show current headline, its direct ancestors and all
                 their children; if point is not on headline, also show
                 entry and all children

  canonical      show current headline, its direct ancestors along with
                 their entries and children; if point is not located on
                 the headline, also show current entry and all children

As special cases, a nil or t value means show all contexts in
`minimal' or `canonical' view, respectively.

Some views can make displayed information very compact, but also
make it harder to edit the location of the match.  In such
a case, use the command `org-fold-reveal' (`\\[org-fold-reveal]') to show
more context."
  :group 'org-fold-reveal-location
  :version "26.1"
  :package-version '(Org . "9.0")
  :type '(choice
	  (const :tag "Canonical" t)
	  (const :tag "Minimal" nil)
	  (repeat :greedy t :tag "Individual contexts"
		  (cons
		   (choice :tag "Context"
			   (const agenda)
			   (const org-goto)
			   (const occur-tree)
			   (const tags-tree)
			   (const link-search)
			   (const mark-goto)
			   (const bookmark-jump)
			   (const isearch)
			   (const default))
		   (choice :tag "Detail level"
			   (const minimal)
			   (const local)
			   (const ancestors)
                           (const ancestors-full)
			   (const lineage)
			   (const tree)
			   (const canonical))))))

(defvar org-fold-reveal-start-hook nil
  "Hook run before revealing a location.")

(defcustom org-fold-catch-invisible-edits 'smart
  "Check if in invisible region before inserting or deleting a character.
Valid values are:

nil              Do not check, so just do invisible edits.
error            Throw an error and do nothing.
show             Make point visible, and do the requested edit.
show-and-error   Make point visible, then throw an error and abort the edit.
smart            Make point visible, and do insertion/deletion if it is
                 adjacent to visible text and the change feels predictable.
                 Never delete a previously invisible character or add in the
                 middle or right after an invisible region.  Basically, this
                 allows insertion and backward-delete right before ellipses.
                 FIXME: maybe in this case we should not even show?"
  :group 'org-edit-structure
  :version "24.1"
  :type '(choice
	  (const :tag "Do not check" nil)
	  (const :tag "Throw error when trying to edit" error)
	  (const :tag "Unhide, but do not do the edit" show-and-error)
	  (const :tag "Show invisible part and do the edit" show)
	  (const :tag "Be smart and do the right thing" smart)))

;;; Core functionality

;;; API

;;;; Modifying folding specs

(defalias 'org-fold-folding-spec-p #'org-fold-core-folding-spec-p)
(defalias 'org-fold-add-folding-spec #'org-fold-core-add-folding-spec)
(defalias 'org-fold-remove-folding-spec #'org-fold-core-remove-folding-spec)

(defun org-fold-initialize (ellipsis)
  "Setup folding in current Org buffer."
  (setq-local org-fold-core-isearch-open-function #'org-fold--isearch-reveal)
  (setq-local org-fold-core-extend-changed-region-functions (list #'org-fold--extend-changed-region))
  ;; FIXME: Converting org-link + org-description to overlays when
  ;; search matches hidden "[[" part of the link, reverses priority of
  ;; link and description and hides the whole link.  Working around
  ;; this until there will be no need to convert text properties to
  ;; overlays for isearch.
  (setq-local org-fold-core--isearch-special-specs '(org-link))
  (org-fold-core-initialize `((org-fold-outline
                       (:ellipsis . ,ellipsis)
                       (:fragile . ,#'org-fold--reveal-outline-maybe)
                       (:isearch-open . t)
                       ;; This is needed to make sure that inserting a
                       ;; new planning line in folded heading is not
                       ;; revealed.
                       (:front-sticky . t)
                       (:rear-sticky . t)
                       (:font-lock-skip . t)
                       (:alias . (headline heading outline inlinetask plain-list)))
                      (org-fold-block
                       (:ellipsis . ,ellipsis)
                       (:fragile . ,#'org-fold--reveal-drawer-or-block-maybe)
                       (:isearch-open . t)
                       (:front-sticky . t)
                       (:alias . ( block center-block comment-block
                                   dynamic-block example-block export-block
                                   quote-block special-block src-block
                                   verse-block)))
                      (org-fold-drawer
                       (:ellipsis . ,ellipsis)
                       (:fragile . ,#'org-fold--reveal-drawer-or-block-maybe)
                       (:isearch-open . t)
                       (:front-sticky . t)
                       (:alias . (drawer property-drawer)))
                      ,org-link--description-folding-spec
                      ,org-link--link-folding-spec)))

;;;; Searching and examining folded text

(defalias 'org-fold-folded-p #'org-fold-core-folded-p)
(defalias 'org-fold-get-folding-spec #'org-fold-core-get-folding-spec)
(defalias 'org-fold-get-folding-specs-in-region #'org-fold-core-get-folding-specs-in-region)
(defalias 'org-fold-get-region-at-point #'org-fold-core-get-region-at-point)
(defalias 'org-fold-next-visibility-change #'org-fold-core-next-visibility-change)
(defalias 'org-fold-previous-visibility-change #'org-fold-core-previous-visibility-change)
(defalias 'org-fold-next-folding-state-change #'org-fold-core-next-folding-state-change)
(defalias 'org-fold-previous-folding-state-change #'org-fold-core-previous-folding-state-change)
(defalias 'org-fold-search-forward #'org-fold-core-search-forward)

;;;;; Macros

(defmacro org-fold-save-outline-visibility--overlays (use-markers &rest body)
  "Save and restore outline visibility around BODY.
If USE-MARKERS is non-nil, use markers for the positions.  This
means that the buffer may change while running BODY, but it also
means that the buffer should stay alive during the operation,
because otherwise all these markers will point to nowhere."
  (declare (debug (form body)) (indent 1))
  (org-with-gensyms (data invisible-types markers?)
    `(let* ((,invisible-types '(org-hide-block outline))
	    (,markers? ,use-markers)
	    (,data
	     (mapcar (lambda (o)
		       (let ((beg (overlay-start o))
			     (end (overlay-end o))
			     (type (overlay-get o 'invisible)))
			 (and beg end
			      (> end beg)
			      (memq type ,invisible-types)
			      (list (if ,markers? (copy-marker beg) beg)
				    (if ,markers? (copy-marker end t) end)
				    type))))
		     (org-with-wide-buffer
		      (overlays-in (point-min) (point-max))))))
       (unwind-protect (progn ,@body)
	 (org-with-wide-buffer
	  (dolist (type ,invisible-types)
	    (remove-overlays (point-min) (point-max) 'invisible type))
	  (pcase-dolist (`(,beg ,end ,type) (delq nil ,data))
	    (org-fold-region beg end t type)
	    (when ,markers?
	      (set-marker beg nil)
	      (set-marker end nil))))))))
(defmacro org-fold-save-outline-visibility--text-properties (use-markers &rest body)
  "Save and restore outline visibility around BODY.
If USE-MARKERS is non-nil, use markers for the positions.  This
means that the buffer may change while running BODY, but it also
means that the buffer should stay alive during the operation,
because otherwise all these markers will point to nowhere."
  (declare (debug (form body)) (indent 1))
  (org-with-gensyms (data specs markers?)
    `(let* ((,specs (org-fold-core-folding-spec-list))
	    (,markers? ,use-markers)
	    (,data
             (org-with-wide-buffer
              (let (data-val)
                (dolist (spec ,specs)
                  (let ((pos (point-min)))
		    (while (< pos (point-max))
                      (when (org-fold-get-folding-spec spec pos)
                        (let ((region (org-fold-get-region-at-point spec pos)))
		          (if ,markers?
			      (push (list (copy-marker (car region))
				          (copy-marker (cdr region) t)
                                          spec)
                                    data-val)
                            (push (list (car region) (cdr region) spec)
			          data-val))))
                      (setq pos (org-fold-next-folding-state-change spec pos)))))
                data-val))))
       (unwind-protect (progn ,@body)
	 (org-with-wide-buffer
	  (org-fold-region (point-min) (point-max) nil)
	  (pcase-dolist (`(,beg ,end ,spec) (delq nil ,data))
	    (org-fold-region beg end t spec)
	    (when ,markers?
	      (set-marker beg nil)
	      (set-marker end nil))))))))
(defmacro org-fold-save-outline-visibility (use-markers &rest body)
  "Save and restore outline visibility around BODY.
If USE-MARKERS is non-nil, use markers for the positions.  This
means that the buffer may change while running BODY, but it also
means that the buffer should stay alive during the operation,
because otherwise all these markers will point to nowhere."
  (declare (debug (form body)) (indent 1))
  `(if (eq org-fold-core-style 'text-properties)
       (org-fold-save-outline-visibility--text-properties ,use-markers ,@body)
     (org-fold-save-outline-visibility--overlays ,use-markers ,@body)))

;;;; Changing visibility (regions, blocks, drawers, headlines)

;;;;; Region visibility

;; (defalias 'org-fold-region #'org-fold-core-region)
(defun org-fold-region--overlays (from to flag spec)
  "Hide or show lines from FROM to TO, according to FLAG.
SPEC is the invisibility spec, as a symbol."
  (remove-overlays from to 'invisible spec)
  ;; Use `front-advance' since text right before to the beginning of
  ;; the overlay belongs to the visible line than to the contents.
  (when flag
    (let ((o (make-overlay from to nil 'front-advance)))
      (overlay-put o 'evaporate t)
      (overlay-put o 'invisible spec)
      (overlay-put o
                   'isearch-open-invisible
                   (lambda (&rest _) (org-fold-show-context 'isearch))))))
(defsubst org-fold-region (from to flag &optional spec)
  "Hide or show lines from FROM to TO, according to FLAG.
SPEC is the invisibility spec, as a symbol."
  (if (eq org-fold-core-style 'text-properties)
      (org-fold-core-region from to flag spec)
    (org-fold-region--overlays from to flag spec)))

(defun org-fold-show-all--text-properties (&optional types)
  "Show all contents in the visible part of the buffer.
By default, the function expands headings, blocks and drawers.
When optional argument TYPES is a list of symbols among `blocks',
`drawers' and `headings', to only expand one specific type."
  (interactive)
  (dolist (type (or types '(blocks drawers headings)))
    (org-fold-region (point-min) (point-max) nil
	             (pcase type
	               (`blocks 'block)
	               (`drawers 'drawer)
	               (`headings 'headline)
	               (_ (error "Invalid type: %S" type))))))
(defun org-fold-show-all--overlays (&optional types)
  "Show all contents in the visible part of the buffer.
By default, the function expands headings, blocks and drawers.
When optional argument TYPE is a list of symbols among `blocks',
`drawers' and `headings', to only expand one specific type."
  (interactive)
  (let ((types (or types '(blocks drawers headings))))
    (when (memq 'blocks types)
      (org-fold-region (point-min) (point-max) nil 'org-hide-block))
    (cond
     ;; Fast path.  Since headings and drawers share the same
     ;; invisible spec, clear everything in one go.
     ((and (memq 'headings types)
           (memq 'drawers types))
      (org-fold-region (point-min) (point-max) nil 'outline))
     ((memq 'headings types)
      (org-fold-region (point-min) (point-max) nil 'outline)
      (org-cycle-hide-drawers 'all))
     ((memq 'drawers types)
      (save-excursion
        (goto-char (point-min))
        (while (re-search-forward org-drawer-regexp nil t)
          (let* ((pair (get-char-property-and-overlay (line-beginning-position)
                                                      'invisible))
                 (o (cdr-safe pair)))
            (if (overlayp o) (goto-char (overlay-end o))
              (pcase (get-char-property-and-overlay (point) 'invisible)
                (`(outline . ,o)
                 (goto-char (overlay-end o))
                 (delete-overlay o))
                (_ nil))))))))))
(defsubst org-fold-show-all (&optional types)
  "Show all contents in the visible part of the buffer.
By default, the function expands headings, blocks and drawers.
When optional argument TYPES is a list of symbols among `blocks',
`drawers' and `headings', to only expand one specific type."
  (interactive)
  (if (eq org-fold-core-style 'text-properties)
      (org-fold-show-all--text-properties types)
    (org-fold-show-all--overlays types)))

(defun org-fold-flag-above-first-heading (&optional arg)
  "Hide from bob up to the first heading.
Move point to the beginning of first heading or end of buffer."
  (goto-char (point-min))
  (unless (org-at-heading-p)
    (outline-next-heading))
  (unless (bobp)
    (org-fold-region 1 (1- (point)) (not arg) 'outline)))

;;;;; Heading visibility

(defun org-fold-heading (flag &optional entry)
  "Fold/unfold the current heading.  FLAG non-nil means make invisible.
When ENTRY is non-nil, show the entire entry."
  (save-excursion
    (org-back-to-heading t)
    ;; Check if we should show the entire entry
    (if (not entry)
	(org-fold-region
	 (line-end-position 0) (line-end-position) flag 'outline)
      (org-fold-show-entry)
      (save-excursion
	;; FIXME: potentially catches inlinetasks
	(and (outline-next-heading)
	     (org-fold-heading nil))))))

(defun org-fold-hide-entry ()
  "Hide the body directly following this heading."
  (interactive)
  (save-excursion
    (org-back-to-heading-or-point-min t)
    (when (org-at-heading-p) (forward-line))
    (unless (eobp) ; Current headline is empty and ends at the end of buffer.
      (org-fold-region
       (line-end-position 0)
       (save-excursion
         (if (re-search-forward
 	      (concat "[\r\n]" (org-get-limited-outline-regexp)) nil t)
             (line-end-position 0)
 	   (point-max)))
       t
       'outline))))

(defun org-fold-subtree (flag)
  (save-excursion
    (org-back-to-heading t)
    (org-fold-region (line-end-position)
	     (progn (org-end-of-subtree t) (point))
	     flag
	     'outline)))

;; Replaces `outline-hide-subtree'.
(defun org-fold-hide-subtree ()
  "Hide everything after this heading at deeper levels."
  (interactive)
  (org-fold-subtree t))

;; Replaces `outline-hide-sublevels'
(defun org-fold-hide-sublevels (levels)
  "Hide everything but the top LEVELS levels of headers, in whole buffer.
This also unhides the top heading-less body, if any.

Interactively, the prefix argument supplies the value of LEVELS.
When invoked without a prefix argument, LEVELS defaults to the level
of the current heading, or to 1 if the current line is not a heading."
  (interactive (list
		(cond
		 (current-prefix-arg (prefix-numeric-value current-prefix-arg))
		 ((save-excursion (beginning-of-line)
				  (looking-at outline-regexp))
		  (funcall outline-level))
		 (t 1))))
  (if (< levels 1)
      (error "Must keep at least one level of headers"))
  (save-excursion
    (let* ((beg (progn
                  (goto-char (point-min))
                  ;; Skip the prelude, if any.
                  (unless (org-at-heading-p) (outline-next-heading))
                  (point)))
           (end (progn
                  (goto-char (point-max))
                  ;; Keep empty last line, if available.
                  (max (point-min) (if (bolp) (1- (point)) (point))))))
      (if (< end beg)
	  (setq beg (prog1 end (setq end beg))))
      ;; First hide everything.
      (org-fold-region beg end t 'headline)
      ;; Then unhide the top level headers.
      (org-map-region
       (lambda ()
	 (when (<= (funcall outline-level) levels)
           (org-fold-heading nil)))
       beg end)
      ;; Finally unhide any trailing newline.
      (goto-char (point-max))
      (if (and (bolp) (not (bobp)) (outline-invisible-p (1- (point))))
          (org-fold-region (max (point-min) (1- (point))) (point) nil)))))

(defun org-fold-show-entry ()
  "Show the body directly following its heading.
Show the heading too, if it is currently invisible."
  (interactive)
  (save-excursion
    (org-back-to-heading-or-point-min t)
    (org-fold-region
     (line-end-position 0)
     (save-excursion
       (if (re-search-forward
 	    (concat "[\r\n]\\(" (org-get-limited-outline-regexp) "\\)") nil t)
 	   (match-beginning 1)
 	 (point-max)))
     nil
     'outline)
    (org-cycle-hide-drawers 'children)))

(defalias 'org-fold-show-hidden-entry #'org-fold-show-entry
  "Show an entry where even the heading is hidden.")

(defun org-fold-show-siblings ()
  "Show all siblings of the current headline."
  (save-excursion
    (while (org-goto-sibling) (org-fold-heading nil)))
  (save-excursion
    (while (org-goto-sibling 'previous)
      (org-fold-heading nil))))

(defun org-fold-show-children (&optional level)
  "Show all direct subheadings of this heading.
Prefix arg LEVEL is how many levels below the current level
should be shown.  Default is enough to cause the following
heading to appear."
  (interactive "p")
  (unless (org-before-first-heading-p)
    (save-excursion
      (org-with-limited-levels (org-back-to-heading t))
      (let* ((current-level (funcall outline-level))
             (max-level (org-get-valid-level
                         current-level
                         (if level (prefix-numeric-value level) 1)))
             (end (save-excursion (org-end-of-subtree t t)))
             (regexp-fmt "^\\*\\{%d,%s\\}\\(?: \\|$\\)")
             (past-first-child nil)
             ;; Make sure to skip inlinetasks.
             (re (format regexp-fmt
                         current-level
                         (cond
                          ((not (featurep 'org-inlinetask)) "")
                          (org-odd-levels-only (- (* 2 org-inlinetask-min-level)
                                                  3))
                          (t (1- org-inlinetask-min-level))))))
        ;; Display parent heading.
        (org-fold-heading nil)
        (forward-line)
        ;; Display children.  First child may be deeper than expected
        ;; MAX-LEVEL.  Since we want to display it anyway, adjust
        ;; MAX-LEVEL accordingly.
        (while (re-search-forward re end t)
          (unless past-first-child
            (setq re (format regexp-fmt
                             current-level
                             (max (funcall outline-level) max-level)))
            (setq past-first-child t))
          (org-fold-heading nil))))))

(defun org-fold-show-subtree ()
  "Show everything after this heading at deeper levels."
  (interactive)
  (org-fold-region
   (point) (save-excursion (org-end-of-subtree t t)) nil 'outline))

(defun org-fold-show-branches ()
  "Show all subheadings of this heading, but not their bodies."
  (interactive)
  (org-fold-show-children 1000))

(defun org-fold-show-branches-buffer--text-properties ()
  "Show all branches in the buffer."
  (org-fold-flag-above-first-heading)
  (org-fold-hide-sublevels 1)
  (unless (eobp)
    (org-fold-show-branches)
    (while (outline-get-next-sibling)
      (org-fold-show-branches)))
  (goto-char (point-min)))
(defun org-fold-show-branches-buffer--overlays ()
  "Show all branches in the buffer."
  (org-fold-flag-above-first-heading)
  (outline-hide-sublevels 1)
  (unless (eobp)
    (outline-show-branches)
    (while (outline-get-next-sibling)
      (outline-show-branches)))
  (goto-char (point-min)))
(defsubst org-fold-show-branches-buffer ()
  "Show all branches in the buffer."
  (if (eq org-fold-core-style 'text-properties)
      (org-fold-show-branches-buffer--text-properties)
    (org-fold-show-branches-buffer--overlays)))

;;;;; Blocks and drawers visibility

(defun org-fold--hide-wrapper-toggle (element category force no-error)
  "Toggle visibility for ELEMENT.

ELEMENT is a block or drawer type parsed element.  CATEGORY is
either `block' or `drawer'.  When FORCE is `off', show the block
or drawer.  If it is non-nil, hide it unconditionally.  Throw an
error when not at a block or drawer, unless NO-ERROR is non-nil.

Return a non-nil value when toggling is successful."
  (let ((type (org-element-type element)))
    (cond
     ((memq type
            (pcase category
              (`drawer '(drawer property-drawer))
              (`block '(center-block
                        comment-block dynamic-block example-block export-block
                        quote-block special-block src-block verse-block))
              (_ (error "Unknown category: %S" category))))
      (let* ((post (org-element-property :post-affiliated element))
             (start (save-excursion
                      (goto-char post)
                      (line-end-position)))
             (end (save-excursion
                    (goto-char (org-element-property :end element))
                    (skip-chars-backward " \t\n")
                    (line-end-position))))
        ;; Do nothing when not before or at the block opening line or
        ;; at the block closing line.
        (unless (let ((eol (line-end-position)))
                  (and (> eol start) (/= eol end)))
          (let* ((spec (if (eq org-fold-core-style 'text-properties)
                           category
                         (if (eq category 'block) 'org-hide-block 'outline)))
                 (flag
                  (cond ((eq force 'off) nil)
                        (force t)
                        ((if (eq org-fold-core-style 'text-properties)
                             (org-fold-folded-p start spec)
                           (eq spec (get-char-property start 'invisible)))
                         nil)
                        (t t))))
            (org-fold-region start end flag spec))
          ;; When the block is hidden away, make sure point is left in
          ;; a visible part of the buffer.
          (when (invisible-p (max (1- (point)) (point-min)))
            (goto-char post))
          ;; Signal success.
          t)))
     (no-error nil)
     (t
      (user-error (format "%s@%s: %s"
                          (buffer-file-name (buffer-base-buffer))
                          (point)
                          (if (eq category 'drawer)
	                      "Not at a drawer"
	                    "Not at a block")))))))

(defun org-fold-hide-block-toggle (&optional force no-error element)
  "Toggle the visibility of the current block.

When optional argument FORCE is `off', make block visible.  If it
is non-nil, hide it unconditionally.  Throw an error when not at
a block, unless NO-ERROR is non-nil.  When optional argument
ELEMENT is provided, consider it instead of the current block.

Return a non-nil value when toggling is successful."
  (interactive)
  (org-fold--hide-wrapper-toggle
   (or element (org-element-at-point)) 'block force no-error))

(defun org-fold-hide-drawer-toggle (&optional force no-error element)
  "Toggle the visibility of the current drawer.

When optional argument FORCE is `off', make drawer visible.  If
it is non-nil, hide it unconditionally.  Throw an error when not
at a drawer, unless NO-ERROR is non-nil.  When optional argument
ELEMENT is provided, consider it instead of the current drawer.

Return a non-nil value when toggling is successful."
  (interactive)
  (org-fold--hide-wrapper-toggle
   (or element (org-element-at-point)) 'drawer force no-error))

(defun org-fold-hide-block-all ()
  "Fold all blocks in the current buffer."
  (interactive)
  (org-block-map (apply-partially #'org-fold-hide-block-toggle 'hide)))

(defun org-fold-hide-drawer-all ()
  "Fold all drawers in the current buffer."
  (let ((begin (point-min))
        (end (point-max)))
    (org-fold--hide-drawers begin end)))

(defun org-fold--hide-drawers--overlays (begin end)
  "Hide all drawers between BEGIN and END."
  (save-excursion
    (goto-char begin)
    (while (and (< (point) end) (re-search-forward org-drawer-regexp end t))
      (let* ((pair (get-char-property-and-overlay (line-beginning-position)
                                                  'invisible))
             (o (cdr-safe pair)))
        (if (overlayp o) (goto-char (overlay-end o)) ;invisible drawer
          (pcase (get-char-property-and-overlay (point) 'invisible)
            (`(outline . ,o) (goto-char (overlay-end o))) ;already folded
            (_
             (let* ((drawer (org-element-at-point))
                    (type (org-element-type drawer)))
               (when (memq type '(drawer property-drawer))
                 (org-fold-hide-drawer-toggle t nil drawer)
                 ;; Make sure to skip drawer entirely or we might flag it
                 ;; another time when matching its ending line with
                 ;; `org-drawer-regexp'.
                 (goto-char (org-element-property :end drawer)))))))))))
(defun org-fold--hide-drawers--text-properties (begin end)
  "Hide all drawers between BEGIN and END."
  (save-excursion
    (goto-char begin)
    (while (and (< (point) end)
                (re-search-forward org-drawer-regexp end t))
      ;; Skip folded drawers
      (if (org-fold-folded-p nil 'drawer)
          (goto-char (org-fold-next-folding-state-change 'drawer nil end))
        (let* ((drawer (org-element-at-point))
               (type (org-element-type drawer)))
          (when (memq type '(drawer property-drawer))
            (org-fold-hide-drawer-toggle t nil drawer)
            ;; Make sure to skip drawer entirely or we might flag it
            ;; another time when matching its ending line with
            ;; `org-drawer-regexp'.
            (goto-char (org-element-property :end drawer))))))))
(defun org-fold--hide-drawers (begin end)
  "Hide all drawers between BEGIN and END."
  (if (eq org-fold-core-style 'text-properties)
      (org-fold--hide-drawers--text-properties begin end)
    (org-fold--hide-drawers--overlays begin end)))

(defun org-fold-hide-archived-subtrees (beg end)
  "Re-hide all archived subtrees after a visibility state change."
  (org-with-wide-buffer
   (let ((case-fold-search nil)
	 (re (concat org-outline-regexp-bol ".*:" org-archive-tag ":")))
     (goto-char beg)
     ;; Include headline point is currently on.
     (beginning-of-line)
     (while (and (< (point) end) (re-search-forward re end t))
       (when (member org-archive-tag (org-get-tags nil t))
	 (org-fold-subtree t)
	 (org-end-of-subtree t))))))

;;;;; Reveal point location

(defun org-fold-show-context (&optional key)
  "Make sure point and context are visible.
Optional argument KEY, when non-nil, is a symbol.  See
`org-fold-show-context-detail' for allowed values and how much is to
be shown."
  (org-fold-show-set-visibility
   (cond ((symbolp org-fold-show-context-detail) org-fold-show-context-detail)
	 ((cdr (assq key org-fold-show-context-detail)))
	 (t (cdr (assq 'default org-fold-show-context-detail))))))

(defun org-fold-show-set-visibility--overlays (detail)
  "Set visibility around point according to DETAIL.
DETAIL is either nil, `minimal', `local', `ancestors',
`ancestors-full', `lineage', `tree', `canonical' or t.  See
`org-show-context-detail' for more information."
  ;; Show current heading and possibly its entry, following headline
  ;; or all children.
  (if (and (org-at-heading-p) (not (eq detail 'local)))
      (org-fold-heading nil)
    (org-fold-show-entry)
    ;; If point is hidden within a drawer or a block, make sure to
    ;; expose it.
    (dolist (o (overlays-at (point)))
      (when (memq (overlay-get o 'invisible) '(org-hide-block outline))
        (delete-overlay o)))
    (unless (org-before-first-heading-p)
      (org-with-limited-levels
       (cl-case detail
         ((tree canonical t) (org-fold-show-children))
         ((nil minimal ancestors ancestors-full))
         (t (save-excursion
              (outline-next-heading)
              (org-fold-heading nil)))))))
  ;; Show whole subtree.
  (when (eq detail 'ancestors-full) (org-fold-show-subtree))
  ;; Show all siblings.
  (when (eq detail 'lineage) (org-fold-show-siblings))
  ;; Show ancestors, possibly with their children.
  (when (memq detail '(ancestors ancestors-full lineage tree canonical t))
    (save-excursion
      (while (org-up-heading-safe)
        (org-fold-heading nil)
        (when (memq detail '(canonical t)) (org-fold-show-entry))
        (when (memq detail '(tree canonical t)) (org-fold-show-children))))))
(defvar org-hide-emphasis-markers); Defined in org.el
(defvar org-pretty-entities); Defined in org.el
(defun org-fold-show-set-visibility--text-properties (detail)
  "Set visibility around point according to DETAIL.
DETAIL is either nil, `minimal', `local', `ancestors',
`ancestors-full', `lineage', `tree', `canonical' or t.  See
`org-show-context-detail' for more information."
  ;; Show current heading and possibly its entry, following headline
  ;; or all children.
  (if (and (org-at-heading-p) (not (eq detail 'local)))
      (org-fold-heading nil)
    (org-fold-show-entry)
    ;; If point is hidden make sure to expose it.
    (when (org-invisible-p)
      ;; FIXME: No clue why, but otherwise the following might not work.
      (redisplay)
      (let ((region (org-fold-get-region-at-point)))
        ;; Reveal emphasis markers.
        (when (eq detail 'local)
          (let (org-hide-emphasis-markers
                org-link-descriptive
                org-pretty-entities
                org-hide-macro-markers
                (region (or (org-find-text-property-region (point) 'org-emphasis)
                            (org-find-text-property-region (point) 'org-macro)
                            (org-find-text-property-region (point) 'invisible)
                            region)))
            (when region
              (org-with-point-at (car region)
                (beginning-of-line)
                (let (font-lock-extend-region-functions)
                  (font-lock-fontify-region (max (point-min) (1- (car region))) (cdr region))))))
          ;; Unfold links.
          (when region
            (dolist (spec '(org-link org-link-description))
              (org-fold-region (car region) (cdr region) nil spec))))
        (when region
          (dolist (spec (org-fold-core-folding-spec-list))
            ;; Links are taken care by above.
            (unless (memq spec '(org-link org-link-description))
              (org-fold-region (car region) (cdr region) nil spec))))))
    (unless (org-before-first-heading-p)
      (org-with-limited-levels
       (cl-case detail
	 ((tree canonical t) (org-fold-show-children))
	 ((nil minimal ancestors ancestors-full))
	 (t (save-excursion
	      (outline-next-heading)
	      (org-fold-heading nil)))))))
  ;; Show whole subtree.
  (when (eq detail 'ancestors-full) (org-fold-show-subtree))
  ;; Show all siblings.
  (when (eq detail 'lineage) (org-fold-show-siblings))
  ;; Show ancestors, possibly with their children.
  (when (memq detail '(ancestors ancestors-full lineage tree canonical t))
    (save-excursion
      (while (org-up-heading-safe)
	(org-fold-heading nil)
	(when (memq detail '(canonical t)) (org-fold-show-entry))
	(when (memq detail '(tree canonical t)) (org-fold-show-children))))))
(defun org-fold-show-set-visibility (detail)
  "Set visibility around point according to DETAIL.
DETAIL is either nil, `minimal', `local', `ancestors', `lineage',
`tree', `canonical' or t.  See `org-fold-show-context-detail' for more
information."
  (if (eq org-fold-core-style 'text-properties)
      (org-fold-show-set-visibility--text-properties detail)
    (org-fold-show-set-visibility--overlays detail)))

(defun org-fold-reveal (&optional siblings)
  "Show current entry, hierarchy above it, and the following headline.

This can be used to show a consistent set of context around
locations exposed with `org-fold-show-context'.

With optional argument SIBLINGS, on each level of the hierarchy all
siblings are shown.  This repairs the tree structure to what it would
look like when opened with hierarchical calls to `org-cycle'.

With a \\[universal-argument] \\[universal-argument] prefix, \
go to the parent and show the entire tree."
  (interactive "P")
  (run-hooks 'org-fold-reveal-start-hook)
  (cond ((equal siblings '(4)) (org-fold-show-set-visibility 'canonical))
	((equal siblings '(16))
	 (save-excursion
	   (when (org-up-heading-safe)
	     (org-fold-show-subtree)
	     (run-hook-with-args 'org-cycle-hook 'subtree))))
	(t (org-fold-show-set-visibility 'lineage))))

;;; Make isearch search in some text hidden via text properties.

(defun org-fold--isearch-reveal (&rest _)
  "Reveal text at POS found by isearch."
  (org-fold-show-context 'isearch))

;;; Handling changes in folded elements

(defun org-fold--extend-changed-region (from to)
  "Consider folded regions in the next/previous line when fixing
region visibility.
This function is intended to be used as a member of
`org-fold-core-extend-changed-region-functions'."
  ;; If the edit is done in the first line of a folded drawer/block,
  ;; the folded text is only starting from the next line and needs to
  ;; be checked.
  (setq to (save-excursion (goto-char to) (line-beginning-position 2)))
  ;; If the ":END:" line of the drawer is deleted, the folded text is
  ;; only ending at the previous line and needs to be checked.
  (setq from (save-excursion (goto-char from) (line-beginning-position 0)))
  (cons from to))

(defun org-fold--reveal-outline-maybe (region _)
  "Reveal folded outline in REGION when needed.

This function is intended to be used as :fragile property of
`org-fold-outline' spec.  See `org-fold-core--specs' for details."
  (save-match-data
    (org-with-wide-buffer
     (goto-char (car region))
     ;; The line before beginning of the fold should be either a
     ;; headline or a list item.
     (backward-char)
     (beginning-of-line)
     ;; Make sure that headline is not partially hidden
     (unless (org-fold-folded-p nil 'headline)
       (org-fold-region
        (max (point-min) (1- (point)))
        (let ((endl (line-end-position)))
          (save-excursion
            (goto-char endl)
            (skip-chars-forward "\n\t\r ")
            ;; Unfold blank lines.
            (if (or (and (looking-at-p "\\*")
                         (> (point) (1+ endl)))
                    (eq (point) (point-max)))
                (point)
              endl)))
        nil 'headline))
     ;; Never hide level 1 headlines
     (save-excursion
       (goto-char (line-end-position))
       (when (re-search-forward (rx bol "* ") (cdr region) t)
         (org-fold-region (match-beginning 0) (line-end-position) nil 'headline)))
     ;; Check the validity of headline
     (unless (let ((case-fold-search t))
	       (looking-at (rx-to-string
                            `(or (regex ,(org-item-re))
			         (regex ,org-outline-regexp-bol)))))
       t))))

(defun org-fold--reveal-drawer-or-block-maybe (region spec)
  "Reveal folded drawer/block (according to SPEC) in REGION when needed.

This function is intended to be used as :fragile property of
`org-fold-drawer' or `org-fold-block' spec."
  (let ((begin-re (cond
		   ((eq spec (org-fold-core-get-folding-spec-from-alias 'drawer))
		    org-drawer-regexp)
		   ;; Group one below contains the type of the block.
		   ((eq spec (org-fold-core-get-folding-spec-from-alias 'block))
		    (rx bol (zero-or-more (any " " "\t"))
			"#+begin"
			(or ":"
			    (seq "_"
				 (group (one-or-more (not (syntax whitespace))))))))))
        ;; To be determined later. May depend on `begin-re' match (i.e. for blocks).
        end-re)
    (save-match-data ; we should not clobber match-data in after-change-functions
      (let ((fold-begin (car region))
	    (fold-end (cdr region)))
	(let (unfold?)
	  (catch :exit
	    ;; The line before folded text should be beginning of
	    ;; the drawer/block.
	    (save-excursion
	      (goto-char fold-begin)
	      ;; The line before beginning of the fold should be the
	      ;; first line of the drawer/block.
	      (backward-char)
	      (beginning-of-line)
	      (unless (let ((case-fold-search t))
			(looking-at begin-re)) ; the match-data will be used later
		(throw :exit (setq unfold? t))))
            ;; Set `end-re' for the current drawer/block.
            (setq end-re
		  (cond
		   ((eq spec (org-fold-core-get-folding-spec-from-alias 'drawer))
                    org-property-end-re)
		   ((eq spec (org-fold-core-get-folding-spec-from-alias 'block))
		    (let ((block-type (match-string 1))) ; the last match is from `begin-re'
		      (concat (rx bol (zero-or-more (any " " "\t")) "#+end")
			      (if block-type
				  (concat "_"
					  (regexp-quote block-type)
					  (rx (zero-or-more (any " " "\t")) eol))
				(rx (opt ":") (zero-or-more (any " " "\t")) eol)))))))
	    ;; The last line of the folded text should match `end-re'.
	    (save-excursion
	      (goto-char fold-end)
	      (beginning-of-line)
	      (unless (let ((case-fold-search t))
			(looking-at end-re))
		(throw :exit (setq unfold? t))))
	    ;; There should be no `end-re' or
	    ;; `org-outline-regexp-bol' anywhere in the
	    ;; drawer/block body.
	    (save-excursion
	      (goto-char fold-begin)
	      (when (save-excursion
		      (let ((case-fold-search t))
			(re-search-forward (rx-to-string `(or (regex ,end-re)
						              (regex ,org-outline-regexp-bol)))
					   (max (point)
						(1- (save-excursion
						      (goto-char fold-end)
						      (line-beginning-position))))
					   t)))
		(throw :exit (setq unfold? t)))))
          unfold?)))))

;; Catching user edits inside invisible text
(defun org-fold-check-before-invisible-edit--overlays (kind)
  "Check if editing KIND is dangerous with invisible text around.
The detailed reaction depends on the user option
`org-fold-catch-invisible-edits'."
  ;; First, try to get out of here as quickly as possible, to reduce overhead
  (when (and org-fold-catch-invisible-edits
             (or (not (boundp 'visible-mode)) (not visible-mode))
             (or (get-char-property (point) 'invisible)
                 (get-char-property (max (point-min) (1- (point))) 'invisible)))
    ;; OK, we need to take a closer look.  Do not consider
    ;; invisibility obtained through text properties (e.g., link
    ;; fontification), as it cannot be toggled.
    (let* ((invisible-at-point
            (pcase (get-char-property-and-overlay (point) 'invisible)
              (`(,_ . ,(and (pred overlayp) o)) o)))
           (invisible-before-point
            (and (not (bobp))
                 (pcase (get-char-property-and-overlay (1- (point)) 'invisible)
                   (`(,_ . ,(and (pred overlayp) o)) o))))
           (border-and-ok-direction
            (or
             ;; Check if we are acting predictably before invisible
             ;; text.
             (and invisible-at-point (not invisible-before-point)
		  (memq kind '(insert delete-backward)))
             ;; Check if we are acting predictably after invisible text
             ;; This works not well, and I have turned it off.  It seems
             ;; better to always show and stop after invisible text.
             ;; (and (not invisible-at-point) invisible-before-point
             ;;  (memq kind '(insert delete)))
             )))
      (when (or invisible-at-point invisible-before-point)
        (when (eq org-fold-catch-invisible-edits 'error)
          (user-error "Editing in invisible areas is prohibited, make them visible first"))
        (if (and org-custom-properties-overlays
                 (y-or-n-p "Display invisible properties in this buffer? "))
            (org-toggle-custom-properties-visibility)
          ;; Make the area visible
          (save-excursion
            (when (and (not invisible-at-point) invisible-before-point)
              (goto-char
               (previous-single-char-property-change (point) 'invisible)))
            ;; Remove whatever overlay is currently making yet-to-be
            ;; edited text invisible.  Also remove nested invisibility
            ;; related overlays.
            (delete-overlay (or invisible-at-point invisible-before-point))
            (let ((origin (if invisible-at-point (point) (1- (point)))))
              (while (pcase (get-char-property-and-overlay origin 'invisible)
                       (`(,_ . ,(and (pred overlayp) o))
                        (delete-overlay o)
                        t)))))
          (cond
           ((eq org-fold-catch-invisible-edits 'show)
            ;; That's it, we do the edit after showing
            (message
             "Unfolding invisible region around point before editing")
            (sit-for 1))
           ((and (eq org-fold-catch-invisible-edits 'smart)
                 border-and-ok-direction)
            (message "Unfolding invisible region around point before editing"))
           (t
            ;; Don't do the edit, make the user repeat it in full visibility
            (user-error "Edit in invisible region aborted, repeat to confirm with text visible"))))))))
(defun org-fold-check-before-invisible-edit--text-properties (kind)
  "Check if editing KIND is dangerous with invisible text around.
The detailed reaction depends on the user option
`org-fold-catch-invisible-edits'."
  ;; First, try to get out of here as quickly as possible, to reduce overhead
  (when (and org-fold-catch-invisible-edits
	     (or (not (boundp 'visible-mode)) (not visible-mode))
	     (or (org-invisible-p)
		 (org-invisible-p (max (point-min) (1- (point))))))
    ;; OK, we need to take a closer look.  Only consider invisibility
    ;; caused by folding of headlines, drawers, and blocks.  Edits
    ;; inside links will be handled by font-lock.
    (let* ((invisible-at-point (org-fold-folded-p (point) '(headline drawer block)))
	   (invisible-before-point
	    (and (not (bobp))
	         (org-fold-folded-p (1- (point)) '(headline drawer block))))
	   (border-and-ok-direction
	    (or
	     ;; Check if we are acting predictably before invisible
	     ;; text.
	     (and invisible-at-point (not invisible-before-point)
		  (memq kind '(insert delete-backward)))
             ;; Check if we are acting predictably after invisible text
             ;; This works not well, and I have turned it off.  It seems
             ;; better to always show and stop after invisible text.
             ;; (and (not invisible-at-point) invisible-before-point
             ;;  (memq kind '(insert delete)))
             )))
      (when (or invisible-at-point invisible-before-point)
	(when (eq org-fold-catch-invisible-edits 'error)
	  (user-error "Editing in invisible areas is prohibited, make them visible first"))
	(if (and org-custom-properties-overlays
		 (y-or-n-p "Display invisible properties in this buffer? "))
	    (org-toggle-custom-properties-visibility)
	  ;; Make the area visible
          (save-excursion
	    (org-fold-show-set-visibility 'local))
          (when invisible-before-point
            (org-with-point-at (1- (point)) (org-fold-show-set-visibility 'local)))
	  (cond
	   ((eq org-fold-catch-invisible-edits 'show)
	    ;; That's it, we do the edit after showing
	    (message
	     "Unfolding invisible region around point before editing")
	    (sit-for 1))
	   ((and (eq org-fold-catch-invisible-edits 'smart)
		 border-and-ok-direction)
	    (message "Unfolding invisible region around point before editing"))
	   (t
	    ;; Don't do the edit, make the user repeat it in full visibility
	    (user-error "Edit in invisible region aborted, repeat to confirm with text visible"))))))))
(defsubst org-fold-check-before-invisible-edit (kind)
  "Check if editing KIND is dangerous with invisible text around.
The detailed reaction depends on the user option
`org-fold-catch-invisible-edits'."
  ;; First, try to get out of here as quickly as possible, to reduce overhead
  (if (eq org-fold-core-style 'text-properties)
      (org-fold-check-before-invisible-edit--text-properties kind)
    (org-fold-check-before-invisible-edit--overlays kind)))

(provide 'org-fold)

;;; org-fold.el ends here

debug log:

solving acf7c0761 ...
found acf7c0761 in https://git.savannah.gnu.org/cgit/emacs/org-mode.git

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

	https://git.savannah.gnu.org/cgit/emacs/org-mode.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).