emacs-orgmode@gnu.org archives
 help / color / mirror / code / Atom feed
blob f110a4b2b3d1ff9a3ab97e48ab2b7ee92305f1d5 38363 bytes (raw)
name: lisp/ox-icalendar.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
1030
1031
 
;;; ox-icalendar.el --- iCalendar Back-End for Org Export Engine -*- lexical-binding: t; -*-

;; Copyright (C) 2004-2020 Free Software Foundation, Inc.

;; Author: Carsten Dominik <carsten at orgmode dot org>
;;      Nicolas Goaziou <n dot goaziou at gmail dot com>
;; Keywords: outlines, hypermedia, calendar, wp
;; 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 library implements an iCalendar back-end for Org generic
;; exporter.  See Org manual for more information.
;;
;; It is expected to conform to RFC 5545.

;;; Code:

(require 'cl-lib)
(require 'ox-ascii)
(declare-function org-bbdb-anniv-export-ical "ol-bbdb" nil)


\f
;;; User-Configurable Variables

(defgroup org-export-icalendar nil
  "Options specific for iCalendar export back-end."
  :tag "Org Export iCalendar"
  :group 'org-export)

(defcustom org-icalendar-combined-agenda-file "~/org.ics"
  "The file name for the iCalendar file covering all agenda files.
This file is created with the command `\\[org-icalendar-combine-agenda-files]'.
The file name should be absolute.  It will be overwritten without warning."
  :group 'org-export-icalendar
  :type 'file)

(defcustom org-icalendar-alarm-time 0
  "Number of minutes for triggering an alarm for exported timed events.

A zero value (the default) turns off the definition of an alarm trigger
for timed events.  If non-zero, alarms are created.

- a single alarm per entry is defined
- The alarm will go off N minutes before the event
- only a DISPLAY action is defined."
  :group 'org-export-icalendar
  :version "24.1"
  :type 'integer)

(defcustom org-icalendar-combined-name "OrgMode"
  "Calendar name for the combined iCalendar representing all agenda files."
  :group 'org-export-icalendar
  :type 'string)

(defcustom org-icalendar-combined-description ""
  "Calendar description for the combined iCalendar (all agenda files)."
  :group 'org-export-icalendar
  :type 'string)

(defcustom org-icalendar-exclude-tags nil
  "Tags that exclude a tree from export.
This variable allows specifying different exclude tags from other
back-ends.  It can also be set with the ICALENDAR_EXCLUDE_TAGS
keyword."
  :group 'org-export-icalendar
  :type '(repeat (string :tag "Tag")))

(defcustom org-icalendar-scheduled-summary-prepend "S: "
  "String used for prepending summary in exported scheduled headlines.")

(defcustom org-icalendar-deadline-summary-prepend "DL: "
  "String used for prepending summary in exported deadlines.")

(defcustom org-icalendar-use-deadline '(event-if-not-todo todo-due)
  "Contexts where iCalendar export should use a deadline time stamp.

This is a list with possibly several symbols in it.  Valid symbols are:

`event-if-todo'

  Deadlines in TODO entries become calendar events.

`event-if-todo-not-done'

  Deadlines in TODO entries with not-DONE state become events.

`event-if-not-todo'

  Deadlines in non-TODO entries become calendar events.

`todo-due'

  Use deadlines in TODO entries as due-dates."
  :group 'org-export-icalendar
  :type
  '(set :greedy t
	(const :tag "DEADLINE in non-TODO entries become events"
	       event-if-not-todo)
	(const :tag "DEADLINE in TODO entries become events"
	       event-if-todo)
	(const :tag "DEADLINE in TODO entries with not-DONE state become events"
	       event-if-todo-not-done)
	(const :tag "DEADLINE in TODO entries become due-dates"
	       todo-due)))

(defcustom org-icalendar-use-scheduled '(todo-start)
  "Contexts where iCalendar export should use a scheduling time stamp.

This is a list with possibly several symbols in it.  Valid symbols are:

`event-if-todo'

  Scheduling time stamps in TODO entries become an event.

`event-if-todo-not-done'

  Scheduling time stamps in TODO entries with not-DONE state
  become events.

`event-if-not-todo'

  Scheduling time stamps in non-TODO entries become an event.

`todo-start'

  Scheduling time stamps in TODO entries become start date.  Some
  calendar applications show TODO entries only after that date."
  :group 'org-export-icalendar
  :type
  '(set :greedy t
	(const :tag "SCHEDULED timestamps in non-TODO entries become events"
	       event-if-not-todo)
	(const :tag "SCHEDULED timestamps in TODO entries become events"
	       event-if-todo)
	(const :tag "SCHEDULED in TODO entries with not-DONE state become events"
	       event-if-todo-not-done)
	(const :tag "SCHEDULED in TODO entries become start date"
	       todo-start)))

(defcustom org-icalendar-categories '(local-tags category)
  "Items that should be entered into the \"categories\" field.

This is a list of symbols, the following are valid:
`category'    The Org mode category of the current file or tree
`todo-state'  The todo state, if any
`local-tags'  The tags, defined in the current line
`all-tags'    All tags, including inherited ones."
  :group 'org-export-icalendar
  :type '(repeat
	  (choice
	   (const :tag "The file or tree category" category)
	   (const :tag "The TODO state" todo-state)
	   (const :tag "Tags defined in current line" local-tags)
	   (const :tag "All tags, including inherited ones" all-tags))))

(defcustom org-icalendar-with-timestamps 'active
  "Non-nil means make an event from plain time stamps.

It can be set to `active', `inactive', t or nil, in order to make
an event from, respectively, only active timestamps, only
inactive ones, all of them or none.

This variable has precedence over `org-export-with-timestamps'.
It can also be set with the #+OPTIONS line, e.g. \"<:t\"."
  :group 'org-export-icalendar
  :type '(choice
	  (const :tag "All timestamps" t)
	  (const :tag "Only active timestamps" active)
	  (const :tag "Only inactive timestamps" inactive)
	  (const :tag "No timestamp" nil)))

(defcustom org-icalendar-include-todo nil
  "Non-nil means create VTODO components from TODO items.

Valid values are:
nil                  don't include any task.
t                    include tasks that are not in DONE state.
`unblocked'          include all TODO items that are not blocked.
`all'                include both done and not done items."
  :group 'org-export-icalendar
  :type '(choice
	  (const :tag "None" nil)
	  (const :tag "Unfinished" t)
	  (const :tag "Unblocked" unblocked)
	  (const :tag "All" all)
	  (repeat :tag "Specific TODO keywords"
		  (string :tag "Keyword"))))

(defcustom org-icalendar-include-bbdb-anniversaries nil
  "Non-nil means a combined iCalendar file should include anniversaries.
The anniversaries are defined in the BBDB database."
  :group 'org-export-icalendar
  :type 'boolean)

(defcustom org-icalendar-include-sexps t
  "Non-nil means export to iCalendar files should also cover sexp entries.
These are entries like in the diary, but directly in an Org file."
  :group 'org-export-icalendar
  :type 'boolean)

(defcustom org-icalendar-include-body t
  "Amount of text below headline to be included in iCalendar export.
This is a number of characters that should maximally be included.
Properties, scheduling and clocking lines will always be removed.
The text will be inserted into the DESCRIPTION field."
  :group 'org-export-icalendar
  :type '(choice
	  (const :tag "Nothing" nil)
	  (const :tag "Everything" t)
	  (integer :tag "Max characters")))

(defcustom org-icalendar-store-UID nil
  "Non-nil means store any created UIDs in properties.

The iCalendar standard requires that all entries have a unique identifier.
Org will create these identifiers as needed.  When this variable is non-nil,
the created UIDs will be stored in the ID property of the entry.  Then the
next time this entry is exported, it will be exported with the same UID,
superseding the previous form of it.  This is essential for
synchronization services.

This variable is not turned on by default because we want to avoid creating
a property drawer in every entry if people are only playing with this feature,
or if they are only using it locally."
  :group 'org-export-icalendar
  :type 'boolean)

(defcustom org-icalendar-timezone (getenv "TZ")
  "The time zone string for iCalendar export.
When nil or the empty string, use output
from (current-time-zone)."
  :group 'org-export-icalendar
  :type '(choice
	  (const :tag "Unspecified" nil)
	  (string :tag "Time zone")))

(defcustom org-icalendar-date-time-format ":%Y%m%dT%H%M%S"
  "Format-string for exporting icalendar DATE-TIME.

See `format-time-string' for a full documentation.  The only
difference is that `org-icalendar-timezone' is used for %Z.

Interesting value are:
 - \":%Y%m%dT%H%M%S\" for local time
 - \";TZID=%Z:%Y%m%dT%H%M%S\" for local time with explicit timezone
 - \":%Y%m%dT%H%M%SZ\" for time expressed in Universal Time"
  :group 'org-export-icalendar
  :version "24.1"
  :type '(choice
	  (const :tag "Local time" ":%Y%m%dT%H%M%S")
	  (const :tag "Explicit local time" ";TZID=%Z:%Y%m%dT%H%M%S")
	  (const :tag "Universal time" ":%Y%m%dT%H%M%SZ")
	  (string :tag "Explicit format")))

(defvar org-icalendar-after-save-hook nil
  "Hook run after an iCalendar file has been saved.
This hook is run with the name of the file as argument.  A good
way to use this is to tell a desktop calendar application to
re-read the iCalendar file.")


\f
;;; Define Back-End

(org-export-define-derived-backend 'icalendar 'ascii
  :translate-alist '((clock . ignore)
		     (footnote-definition . ignore)
		     (footnote-reference . ignore)
		     (headline . org-icalendar-entry)
		     (inlinetask . ignore)
		     (planning . ignore)
		     (section . ignore)
		     (inner-template . (lambda (c i) c))
		     (template . org-icalendar-template))
  :options-alist
  '((:exclude-tags
     "ICALENDAR_EXCLUDE_TAGS" nil org-icalendar-exclude-tags split)
    (:with-timestamps nil "<" org-icalendar-with-timestamps)
    ;; Other variables.
    (:icalendar-alarm-time nil nil org-icalendar-alarm-time)
    (:icalendar-categories nil nil org-icalendar-categories)
    (:icalendar-date-time-format nil nil org-icalendar-date-time-format)
    (:icalendar-include-bbdb-anniversaries nil nil org-icalendar-include-bbdb-anniversaries)
    (:icalendar-include-body nil nil org-icalendar-include-body)
    (:icalendar-include-sexps nil nil org-icalendar-include-sexps)
    (:icalendar-include-todo nil nil org-icalendar-include-todo)
    (:icalendar-store-UID nil nil org-icalendar-store-UID)
    (:icalendar-timezone nil nil org-icalendar-timezone)
    (:icalendar-use-deadline nil nil org-icalendar-use-deadline)
    (:icalendar-use-scheduled nil nil org-icalendar-use-scheduled))
  :filters-alist
  '((:filter-headline . org-icalendar-clear-blank-lines))
  :menu-entry
  '(?c "Export to iCalendar"
       ((?f "Current file" org-icalendar-export-to-ics)
	(?a "All agenda files"
	    (lambda (a s v b) (org-icalendar-export-agenda-files a)))
	(?c "Combine all agenda files"
	    (lambda (a s v b) (org-icalendar-combine-agenda-files a))))))


\f
;;; Internal Functions

(defun org-icalendar-create-uid (file &optional bell)
  "Set ID property on headlines missing it in FILE.
When optional argument BELL is non-nil, inform the user with
a message if the file was modified."
  (let (modified-flag)
    (org-map-entries
     (lambda ()
       (let ((entry (org-element-at-point)))
	 (unless (org-element-property :ID entry)
	   (org-id-get-create)
	   (setq modified-flag t)
	   (forward-line))))
     nil nil 'comment)
    (when (and bell modified-flag)
      (message "ID properties created in file \"%s\"" file)
      (sit-for 2))))

(defun org-icalendar-blocked-headline-p (headline info)
  "Non-nil when HEADLINE is considered to be blocked.

INFO is a plist used as a communication channel.

A headline is blocked when either

  - it has children which are not all in a completed state;

  - it has a parent with the property :ORDERED:, and there are
    siblings prior to it with incomplete status;

  - its parent is blocked because it has siblings that should be
    done first or is a child of a blocked grandparent entry."
  (or
   ;; Check if any child is not done.
   (org-element-map (org-element-contents headline) 'headline
     (lambda (hl) (eq (org-element-property :todo-type hl) 'todo))
     info 'first-match)
   ;; Check :ORDERED: node property.
   (catch 'blockedp
     (let ((current headline))
       (dolist (parent (org-element-lineage headline))
	 (cond
	  ((not (org-element-property :todo-keyword parent))
	   (throw 'blockedp nil))
	  ((org-not-nil (org-element-property :ORDERED parent))
	   (let ((sibling current))
	     (while (setq sibling (org-export-get-previous-element
				   sibling info))
	       (when (eq (org-element-property :todo-type sibling) 'todo)
		 (throw 'blockedp t)))))
	  (t (setq current parent))))))))

(defun org-icalendar-use-UTC-date-time-p ()
  "Non-nil when `org-icalendar-date-time-format' requires UTC time."
  (char-equal (elt org-icalendar-date-time-format
		   (1- (length org-icalendar-date-time-format)))
	      ?Z))

(defvar org-agenda-default-appointment-duration) ; From org-agenda.el.
(defun org-icalendar-convert-timestamp (timestamp keyword &optional end tz)
  "Convert TIMESTAMP to iCalendar format.

TIMESTAMP is a timestamp object.  KEYWORD is added in front of
it, in order to make a complete line (e.g. \"DTSTART\").

When optional argument END is non-nil, use end of time range.
Also increase the hour by two (if time string contains a time),
or the day by one (if it does not contain a time) when no
explicit ending time is specified.

When optional argument TZ is non-nil, timezone data time will be
added to the timestamp.  It can be the string \"UTC\", to use UTC
time, or a string in the IANA TZ database
format (e.g. \"Europe/London\").  In either case, the value of
`org-icalendar-date-time-format' will be ignored."
  (let* ((year-start (org-element-property :year-start timestamp))
	 (year-end (org-element-property :year-end timestamp))
	 (month-start (org-element-property :month-start timestamp))
	 (month-end (org-element-property :month-end timestamp))
	 (day-start (org-element-property :day-start timestamp))
	 (day-end (org-element-property :day-end timestamp))
	 (hour-start (org-element-property :hour-start timestamp))
	 (hour-end (org-element-property :hour-end timestamp))
	 (minute-start (org-element-property :minute-start timestamp))
	 (minute-end (org-element-property :minute-end timestamp))
	 (with-time-p minute-start)
	 (equal-bounds-p
	  (equal (list year-start month-start day-start hour-start minute-start)
		 (list year-end month-end day-end hour-end minute-end)))
	 (mi (cond ((not with-time-p) 0)
		   ((not end) minute-start)
		   ((and org-agenda-default-appointment-duration equal-bounds-p)
		    (+ minute-end org-agenda-default-appointment-duration))
		   (t minute-end)))
	 (h (cond ((not with-time-p) 0)
		  ((not end) hour-start)
		  ((or (not equal-bounds-p)
		       org-agenda-default-appointment-duration)
		   hour-end)
		  (t (+ hour-end 2))))
	 (d (cond ((not end) day-start)
		  ((not with-time-p) (1+ day-end))
		  (t day-end)))
	 (m (if end month-end month-start))
	 (y (if end year-end year-start)))
    (concat
     keyword
     (format-time-string
      (cond ((string-equal tz "UTC") ":%Y%m%dT%H%M%SZ")
	    ((not with-time-p) ";VALUE=DATE:%Y%m%d")
	    ((stringp tz) (concat ";TZID=" tz ":%Y%m%dT%H%M%S"))
	    (t (replace-regexp-in-string "%Z"
					 org-icalendar-timezone
					 org-icalendar-date-time-format
					 t)))
      ;; Convert timestamp into internal time in order to use
      ;; `format-time-string' and fix any mistake (i.e. MI >= 60).
      (encode-time 0 mi h d m y)
      (and (or (string-equal tz "UTC")
	       (and (null tz)
		    with-time-p
		    (org-icalendar-use-UTC-date-time-p)))
	   t)))))

(defun org-icalendar-dtstamp ()
  "Return DTSTAMP property, as a string."
  (format-time-string "DTSTAMP:%Y%m%dT%H%M%SZ" nil t))

(defun org-icalendar-get-categories (entry info)
  "Return categories according to `org-icalendar-categories'.
ENTRY is a headline or an inlinetask element.  INFO is a plist
used as a communication channel."
  (mapconcat
   #'identity
   (org-uniquify
    (let (categories)
      (dolist (type org-icalendar-categories (nreverse categories))
	(cl-case type
	  (category
	   (push (org-export-get-category entry info) categories))
	  (todo-state
	   (let ((todo (org-element-property :todo-keyword entry)))
	     (and todo (push todo categories))))
	  (local-tags
	   (setq categories
		 (append (nreverse (org-export-get-tags entry info))
			 categories)))
	  (all-tags
	   (setq categories
		 (append (nreverse (org-export-get-tags entry info nil t))
			 categories)))))))
   ","))

(defun org-icalendar-transcode-diary-sexp (sexp uid summary)
  "Transcode a diary sexp into iCalendar format.
SEXP is the diary sexp being transcoded, as a string.  UID is the
unique identifier for the entry.  SUMMARY defines a short summary
or subject for the event."
  (when (require 'icalendar nil t)
    (org-element-normalize-string
     (with-temp-buffer
       (let ((sexp (if (not (string-match "\\`<%%" sexp)) sexp
		     (concat (substring sexp 1 -1) " " summary))))
	 (put-text-property 0 1 'uid uid sexp)
	 (insert sexp "\n"))
       (org-diary-to-ical-string (current-buffer))))))

(defun org-icalendar-cleanup-string (s)
  "Cleanup string S according to RFC 5545."
  (when s
    ;; Protect "\", "," and ";" characters. and replace newline
    ;; characters with literal \n.
    (replace-regexp-in-string
     "[ \t]*\n" "\\n"
     (replace-regexp-in-string "[\\,;]" "\\\\\\&" s)
     nil t)))

(defun org-icalendar-fold-string (s)
  "Fold string S according to RFC 5545."
  (org-element-normalize-string
   (mapconcat
    (lambda (line)
      ;; Limit each line to a maximum of 75 characters.  If it is
      ;; longer, fold it by using "\r\n " as a continuation marker.
      (let ((len (length line)))
	(if (<= len 75) line
	  (let ((folded-line (substring line 0 75))
		(chunk-start 75)
		chunk-end)
	    ;; Since continuation marker takes up one character on the
	    ;; line, real contents must be split at 74 chars.
	    (while (< (setq chunk-end (+ chunk-start 74)) len)
	      (setq folded-line
		    (concat folded-line "\r\n "
			    (substring line chunk-start chunk-end))
		    chunk-start chunk-end))
	    (concat folded-line "\r\n " (substring line chunk-start))))))
    (org-split-string s "\n") "\r\n")))


\f
;;; Filters

(defun org-icalendar-clear-blank-lines (headline _back-end _info)
  "Remove blank lines in HEADLINE export.
HEADLINE is a string representing a transcoded headline.
BACK-END and INFO are ignored."
  (replace-regexp-in-string "^\\(?:[ \t]*\n\\)+" "" headline))


\f
;;; Transcode Functions

;;;; Headline and Inlinetasks

;; The main function is `org-icalendar-entry', which extracts
;; information from a headline or an inlinetask (summary,
;; description...) and then delegates code generation to
;; `org-icalendar--vtodo' and `org-icalendar--vevent', depending
;; on the component needed.

;; Obviously, `org-icalendar--valarm' handles alarms, which can
;; happen within a VTODO component.

(defun org-icalendar-entry (entry contents info)
  "Transcode ENTRY element into iCalendar format.

ENTRY is either a headline or an inlinetask.  CONTENTS is
ignored.  INFO is a plist used as a communication channel.

This function is called on every headline, the section below
it (minus inlinetasks) being its contents.  It tries to create
VEVENT and VTODO components out of scheduled date, deadline date,
plain timestamps, diary sexps.  It also calls itself on every
inlinetask within the section."
  (unless (org-element-property :footnote-section-p entry)
    (let* ((type (org-element-type entry))
	   ;; Determine contents really associated to the entry.  For
	   ;; a headline, limit them to section, if any.  For an
	   ;; inlinetask, this is every element within the task.
	   (inside
	    (if (eq type 'inlinetask)
		(cons 'org-data (cons nil (org-element-contents entry)))
	      (let ((first (car (org-element-contents entry))))
		(and (eq (org-element-type first) 'section)
		     (cons 'org-data
			   (cons nil (org-element-contents first))))))))
      (concat
       (let ((todo-type (org-element-property :todo-type entry))
	     (uid (or (org-element-property :ID entry) (org-id-new)))
	     (summary (org-icalendar-cleanup-string
		       (or (org-element-property :SUMMARY entry)
			   (org-export-data
			    (org-element-property :title entry) info))))
	     (loc (org-icalendar-cleanup-string
		   (org-export-get-node-property
		    :LOCATION entry
		    (org-property-inherit-p "LOCATION"))))
	     (class (org-icalendar-cleanup-string
		     (org-export-get-node-property
		      :CLASS entry
		      (org-property-inherit-p "CLASS"))))
	     ;; Build description of the entry from associated section
	     ;; (headline) or contents (inlinetask).
	     (desc
	      (org-icalendar-cleanup-string
	       (or (org-element-property :DESCRIPTION entry)
		   (let ((contents (org-export-data inside info)))
		     (cond
		      ((not (org-string-nw-p contents)) nil)
		      ((wholenump org-icalendar-include-body)
		       (let ((contents (org-trim contents)))
			 (substring
			  contents 0 (min (length contents)
					  org-icalendar-include-body))))
		      (org-icalendar-include-body (org-trim contents)))))))
	     (cat (org-icalendar-get-categories entry info))
	     (tz (org-export-get-node-property
		  :TIMEZONE entry
		  (org-property-inherit-p "TIMEZONE"))))
	 (concat
	  ;; Events: Delegate to `org-icalendar--vevent' to generate
	  ;; "VEVENT" component from scheduled, deadline, or any
	  ;; timestamp in the entry.
	  (let ((deadline (org-element-property :deadline entry))
		(use-deadline (plist-get info :icalendar-use-deadline)))
	    (and deadline
		 (pcase todo-type
		   (`todo (or (memq 'event-if-todo-not-done use-deadline)
			      (memq 'event-if-todo use-deadline)))
		   (`done (memq 'event-if-todo use-deadline))
		   (_ (memq 'event-if-not-todo use-deadline)))
		 (org-icalendar--vevent
		  entry deadline (concat "DL-" uid)
		  (concat org-icalendar-deadline-summary-prepend summary) loc desc cat tz class)))
	  (let ((scheduled (org-element-property :scheduled entry))
		(use-scheduled (plist-get info :icalendar-use-scheduled)))
	    (and scheduled
		 (pcase todo-type
		   (`todo (or (memq 'event-if-todo-not-done use-scheduled)
			      (memq 'event-if-todo use-scheduled)))
		   (`done (memq 'event-if-todo use-scheduled))
		   (_ (memq 'event-if-not-todo use-scheduled)))
		 (org-icalendar--vevent
		  entry scheduled (concat "SC-" uid)
		  (concat org-icalendar-scheduled-summary-prepend summary) loc desc cat tz class)))
	  ;; When collecting plain timestamps from a headline and its
	  ;; title, skip inlinetasks since collection will happen once
	  ;; ENTRY is one of them.
	  (let ((counter 0))
	    (mapconcat
	     #'identity
	     (org-element-map (cons (org-element-property :title entry)
				    (org-element-contents inside))
		 'timestamp
	       (lambda (ts)
		 (when (let ((type (org-element-property :type ts)))
			 (cl-case (plist-get info :with-timestamps)
			   (active (memq type '(active active-range)))
			   (inactive (memq type '(inactive inactive-range)))
			   ((t) t)))
		   (let ((uid (format "TS%d-%s" (cl-incf counter) uid)))
		     (org-icalendar--vevent
		      entry ts uid summary loc desc cat tz class))))
	       info nil (and (eq type 'headline) 'inlinetask))
	     ""))
	  ;; Task: First check if it is appropriate to export it.  If
	  ;; so, call `org-icalendar--vtodo' to transcode it into
	  ;; a "VTODO" component.
	  (when (and todo-type
		     (cl-case (plist-get info :icalendar-include-todo)
		       (all t)
		       (unblocked
			(and (eq type 'headline)
			     (not (org-icalendar-blocked-headline-p
				   entry info))))
		       ((t) (eq todo-type 'todo))))
	    (org-icalendar--vtodo entry uid summary loc desc cat tz class))
	  ;; Diary-sexp: Collect every diary-sexp element within ENTRY
	  ;; and its title, and transcode them.  If ENTRY is
	  ;; a headline, skip inlinetasks: they will be handled
	  ;; separately.
	  (when org-icalendar-include-sexps
	    (let ((counter 0))
	      (mapconcat #'identity
			 (org-element-map
			     (cons (org-element-property :title entry)
				   (org-element-contents inside))
			     'diary-sexp
			   (lambda (sexp)
			     (org-icalendar-transcode-diary-sexp
			      (org-element-property :value sexp)
			      (format "DS%d-%s" (cl-incf counter) uid)
			      summary))
			   info nil (and (eq type 'headline) 'inlinetask))
			 "")))))
       ;; If ENTRY is a headline, call current function on every
       ;; inlinetask within it.  In agenda export, this is independent
       ;; from the mark (or lack thereof) on the entry.
       (when (eq type 'headline)
	 (mapconcat #'identity
		    (org-element-map inside 'inlinetask
		      (lambda (task) (org-icalendar-entry task nil info))
		      info) ""))
       ;; Don't forget components from inner entries.
       contents))))

(defun org-icalendar--vevent
    (entry timestamp uid summary location description categories timezone class)
  "Create a VEVENT component.

ENTRY is either a headline or an inlinetask element.  TIMESTAMP
is a timestamp object defining the date-time of the event.  UID
is the unique identifier for the event.  SUMMARY defines a short
summary or subject for the event.  LOCATION defines the intended
venue for the event.  DESCRIPTION provides the complete
description of the event.  CATEGORIES defines the categories the
event belongs to.  TIMEZONE specifies a time zone for this event
only.  CLASS contains the visibility attribute.  Three of them
(\"PUBLIC\", \"CONFIDENTIAL\", and \"PRIVATE\") are predefined, others
should be treated as \"PRIVATE\" if they are unknown to the iCalendar server.

Return VEVENT component as a string."
  (org-icalendar-fold-string
   (if (eq (org-element-property :type timestamp) 'diary)
       (org-icalendar-transcode-diary-sexp
	(org-element-property :raw-value timestamp) uid summary)
     (concat "BEGIN:VEVENT\n"
	     (org-icalendar-dtstamp) "\n"
	     "UID:" uid "\n"
	     (org-icalendar-convert-timestamp timestamp "DTSTART" nil timezone) "\n"
	     (org-icalendar-convert-timestamp timestamp "DTEND" t timezone) "\n"
	     ;; RRULE.
	     (when (org-element-property :repeater-type timestamp)
	       (format "RRULE:FREQ=%s;INTERVAL=%d\n"
		       (cl-case (org-element-property :repeater-unit timestamp)
			 (hour "HOURLY") (day "DAILY") (week "WEEKLY")
			 (month "MONTHLY") (year "YEARLY"))
		       (org-element-property :repeater-value timestamp)))
	     "SUMMARY:" summary "\n"
	     (and (org-string-nw-p location) (format "LOCATION:%s\n" location))
	     (and (org-string-nw-p class) (format "CLASS:%s\n" class))
	     (and (org-string-nw-p description)
		  (format "DESCRIPTION:%s\n" description))
	     "CATEGORIES:" categories "\n"
	     ;; VALARM.
	     (org-icalendar--valarm entry timestamp summary)
	     "END:VEVENT"))))

(defun org-icalendar--vtodo
  (entry uid summary location description categories timezone class)
  "Create a VTODO component.

ENTRY is either a headline or an inlinetask element.  UID is the
unique identifier for the task.  SUMMARY defines a short summary
or subject for the task.  LOCATION defines the intended venue for
the task.  DESCRIPTION provides the complete description of the
task.  CATEGORIES defines the categories the task belongs to.
TIMEZONE specifies a time zone for this TODO only.

Return VTODO component as a string."
  (let ((start (or (and (memq 'todo-start org-icalendar-use-scheduled)
			(org-element-property :scheduled entry))
		   ;; If we can't use a scheduled time for some
		   ;; reason, start task now.
		   (let ((now (decode-time)))
		     (list 'timestamp
			   (list :type 'active
				 :minute-start (nth 1 now)
				 :hour-start (nth 2 now)
				 :day-start (nth 3 now)
				 :month-start (nth 4 now)
				 :year-start (nth 5 now)))))))
    (org-icalendar-fold-string
     (concat "BEGIN:VTODO\n"
	     "UID:TODO-" uid "\n"
	     (org-icalendar-dtstamp) "\n"
	     (org-icalendar-convert-timestamp start "DTSTART" nil timezone) "\n"
	     (and (memq 'todo-due org-icalendar-use-deadline)
		  (org-element-property :deadline entry)
		  (concat (org-icalendar-convert-timestamp
			   (org-element-property :deadline entry) "DUE" nil timezone)
			  "\n"))
	     "SUMMARY:" summary "\n"
	     (and (org-string-nw-p location) (format "LOCATION:%s\n" location))
	     (and (org-string-nw-p class) (format "CLASS:%s\n" class))
	     (and (org-string-nw-p description)
		  (format "DESCRIPTION:%s\n" description))
	     "CATEGORIES:" categories "\n"
	     "SEQUENCE:1\n"
	     (format "PRIORITY:%d\n"
		     (let ((pri (or (org-element-property :priority entry)
				    org-priority-default)))
		       (floor (- 9 (* 8. (/ (float (- org-priority-lowest pri))
					    (- org-priority-lowest
					       org-priority-highest)))))))
	     (format "STATUS:%s\n"
		     (if (eq (org-element-property :todo-type entry) 'todo)
			 "NEEDS-ACTION"
		       "COMPLETED"))
	     "END:VTODO"))))

(defun org-icalendar--valarm (entry timestamp summary)
  "Create a VALARM component.

ENTRY is the calendar entry triggering the alarm.  TIMESTAMP is
the start date-time of the entry.  SUMMARY defines a short
summary or subject for the task.

Return VALARM component as a string, or nil if it isn't allowed."
  ;; Create a VALARM entry if the entry is timed.  This is not very
  ;; general in that:
  ;; (a) only one alarm per entry is defined,
  ;; (b) only minutes are allowed for the trigger period ahead of the
  ;;     start time,
  ;; (c) only a DISPLAY action is defined.                       [ESF]
  (let ((alarm-time
	 (let ((warntime
		(org-element-property :APPT_WARNTIME entry)))
	   (if warntime (string-to-number warntime) 0))))
    (and (or (> alarm-time 0) (> org-icalendar-alarm-time 0))
	 (org-element-property :hour-start timestamp)
	 (format "BEGIN:VALARM
ACTION:DISPLAY
DESCRIPTION:%s
TRIGGER:-P0DT0H%dM0S
END:VALARM\n"
		 summary
		 (if (zerop alarm-time) org-icalendar-alarm-time alarm-time)))))


;;;; Template

(defun org-icalendar-template (contents info)
  "Return complete document string after iCalendar conversion.
CONTENTS is the transcoded contents string.  INFO is a plist used
as a communication channel."
  (org-icalendar--vcalendar
   ;; Name.
   (if (not (plist-get info :input-file)) (buffer-name (buffer-base-buffer))
     (file-name-nondirectory
      (file-name-sans-extension (plist-get info :input-file))))
   ;; Owner.
   (if (not (plist-get info :with-author)) ""
     (org-export-data (plist-get info :author) info))
   ;; Timezone.
   (if (org-string-nw-p org-icalendar-timezone) org-icalendar-timezone
     (cadr (current-time-zone)))
   ;; Description.
   (org-export-data (plist-get info :title) info)
   contents))

(defun org-icalendar--vcalendar (name owner tz description contents)
  "Create a VCALENDAR component.
NAME, OWNER, TZ, DESCRIPTION and CONTENTS are all strings giving,
respectively, the name of the calendar, its owner, the timezone
used, a short description and the other components included."
  (concat (format "BEGIN:VCALENDAR
VERSION:2.0
X-WR-CALNAME:%s
PRODID:-//%s//Emacs with Org mode//EN
X-WR-TIMEZONE:%s
X-WR-CALDESC:%s
CALSCALE:GREGORIAN\n"
		  (org-icalendar-cleanup-string name)
		  (org-icalendar-cleanup-string owner)
		  (org-icalendar-cleanup-string tz)
		  (org-icalendar-cleanup-string description))
	  contents
	  "END:VCALENDAR\n"))


\f
;;; Interactive Functions

;;;###autoload
(defun org-icalendar-export-to-ics
  (&optional async subtreep visible-only body-only)
  "Export current buffer to an iCalendar file.

If narrowing is active in the current buffer, only export its
narrowed part.

If a region is active, export that region.

A non-nil optional argument ASYNC means the process should happen
asynchronously.  The resulting file should be accessible through
the `org-export-stack' interface.

When optional argument SUBTREEP is non-nil, export the sub-tree
at point, extracting information from the headline properties
first.

When optional argument VISIBLE-ONLY is non-nil, don't export
contents of hidden elements.

When optional argument BODY-ONLY is non-nil, only write code
between \"BEGIN:VCALENDAR\" and \"END:VCALENDAR\".

Return ICS file name."
  (interactive)
  (let ((file (buffer-file-name (buffer-base-buffer))))
    (when (and file org-icalendar-store-UID)
      (org-icalendar-create-uid file 'warn-user)))
  ;; Export part.  Since this back-end is backed up by `ascii', ensure
  ;; links will not be collected at the end of sections.
  (let ((outfile (org-export-output-file-name ".ics" subtreep)))
    (org-export-to-file 'icalendar outfile
      async subtreep visible-only body-only
      '(:ascii-charset utf-8 :ascii-links-to-notes nil)
      (lambda (file)
	(run-hook-with-args 'org-icalendar-after-save-hook file) nil))))

;;;###autoload
(defun org-icalendar-export-agenda-files (&optional async)
  "Export all agenda files to iCalendar files.
When optional argument ASYNC is non-nil, export happens in an
external process."
  (interactive)
  (if async
      ;; Asynchronous export is not interactive, so we will not call
      ;; `org-check-agenda-file'.  Instead we remove any non-existent
      ;; agenda file from the list.
      (let ((files (cl-remove-if-not #'file-exists-p (org-agenda-files t))))
	(org-export-async-start
	    (lambda (results)
	      (dolist (f results) (org-export-add-to-stack f 'icalendar)))
	  `(let (output-files)
	     (dolist (file ',files outputfiles)
	       (with-current-buffer (org-get-agenda-file-buffer file)
		 (push (expand-file-name (org-icalendar-export-to-ics))
		       output-files))))))
    (let ((files (org-agenda-files t)))
      (org-agenda-prepare-buffers files)
      (unwind-protect
	  (dolist (file files)
	    (catch 'nextfile
	      (org-check-agenda-file file)
	      (with-current-buffer (org-get-agenda-file-buffer file)
		(org-icalendar-export-to-ics))))
	(org-release-buffers org-agenda-new-buffers)))))

;;;###autoload
(defun org-icalendar-combine-agenda-files (&optional async)
  "Combine all agenda files into a single iCalendar file.

A non-nil optional argument ASYNC means the process should happen
asynchronously.  The resulting file should be accessible through
the `org-export-stack' interface.

The file is stored under the name chosen in
`org-icalendar-combined-agenda-file'."
  (interactive)
  (if async
      (let ((files (cl-remove-if-not #'file-exists-p (org-agenda-files t))))
	(org-export-async-start
	    (lambda (_)
	      (org-export-add-to-stack
	       (expand-file-name org-icalendar-combined-agenda-file)
	       'icalendar))
	  `(apply #'org-icalendar--combine-files ',files)))
    (apply #'org-icalendar--combine-files (org-agenda-files t))))

(defun org-icalendar-export-current-agenda (file)
  "Export current agenda view to an iCalendar FILE.
This function assumes major mode for current buffer is
`org-agenda-mode'."
  (let* ((org-export-use-babel)		;don't evaluate Babel blocks
	 (contents
	  (org-export-string-as
	   (with-output-to-string
	     (save-excursion
	       (let ((p (point-min))
		     (seen nil))	;prevent duplicates
		 (while (setq p (next-single-property-change p 'org-hd-marker))
		   (let ((m (get-text-property p 'org-hd-marker)))
		     (when (and m (not (member m seen)))
		       (push m seen)
		       (with-current-buffer (marker-buffer m)
			 (org-with-wide-buffer
			  (goto-char (marker-position m))
			  (princ
			   (org-element-normalize-string
			    (buffer-substring (point)
					      (org-entry-end-position))))))))
		   (forward-line)))))
	   'icalendar t
	   '(:ascii-charset utf-8 :ascii-links-to-notes nil
			    :icalendar-include-todo all))))
    (with-temp-file file
      (insert
       (org-icalendar--vcalendar
	org-icalendar-combined-name
	user-full-name
	(or (org-string-nw-p org-icalendar-timezone) (cadr (current-time-zone)))
	org-icalendar-combined-description
	contents)))
    (run-hook-with-args 'org-icalendar-after-save-hook file)))

(defun org-icalendar--combine-files (&rest files)
  "Combine entries from multiple files into an iCalendar file.
FILES is a list of files to build the calendar from."
  ;; At the end of the process, all buffers related to FILES are going
  ;; to be killed.  Make sure to only kill the ones opened in the
  ;; process.
  (let ((org-agenda-new-buffers nil))
    (unwind-protect
	(progn
	  (with-temp-file org-icalendar-combined-agenda-file
	    (insert
	     (org-icalendar--vcalendar
	      ;; Name.
	      org-icalendar-combined-name
	      ;; Owner.
	      user-full-name
	      ;; Timezone.
	      (or (org-string-nw-p org-icalendar-timezone)
		  (cadr (current-time-zone)))
	      ;; Description.
	      org-icalendar-combined-description
	      ;; Contents.
	      (concat
	       ;; Agenda contents.
	       (mapconcat
		(lambda (file)
		  (catch 'nextfile
		    (org-check-agenda-file file)
		    (with-current-buffer (org-get-agenda-file-buffer file)
		      ;; Create ID if necessary.
		      (when org-icalendar-store-UID
			(org-icalendar-create-uid file t))
		      (org-export-as
		       'icalendar nil nil t
		       '(:ascii-charset utf-8 :ascii-links-to-notes nil)))))
		files "")
	       ;; BBDB anniversaries.
	       (when (and org-icalendar-include-bbdb-anniversaries
			  (require 'ol-bbdb nil t))
		 (with-output-to-string (org-bbdb-anniv-export-ical)))))))
	  (run-hook-with-args 'org-icalendar-after-save-hook
			      org-icalendar-combined-agenda-file))
      (org-release-buffers org-agenda-new-buffers))))


(provide 'ox-icalendar)

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

;;; ox-icalendar.el ends here

debug log:

solving f110a4b2b ...
found f110a4b2b in https://yhetil.org/orgmode/1938211.TxZjiQ5Hcs@trex230/
found 0f890534a in https://git.savannah.gnu.org/cgit/emacs/org-mode.git
preparing index
index prepared:
100644 0f890534a8ac338cd27bd336935d9466410bbbd4	lisp/ox-icalendar.el

applying [1/1] https://yhetil.org/orgmode/1938211.TxZjiQ5Hcs@trex230/
diff --git a/lisp/ox-icalendar.el b/lisp/ox-icalendar.el
index 0f890534a..f110a4b2b 100644

Checking patch lisp/ox-icalendar.el...
Applied patch lisp/ox-icalendar.el cleanly.

index at:
100644 f110a4b2b3d1ff9a3ab97e48ab2b7ee92305f1d5	lisp/ox-icalendar.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/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).