emacs-orgmode@gnu.org archives
 help / color / mirror / code / Atom feed
blob 95fa40a8fd9aa220cc51cd0252bc4708fb6fe2b8 28447 bytes (raw)
name: lisp/ox-md.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
 
;;; ox-md.el --- Markdown Back-End for Org Export Engine -*- lexical-binding: t; -*-

;; Copyright (C) 2012-2023 Free Software Foundation, Inc.

;; Author: Nicolas Goaziou <n.goaziou@gmail.com>
;; Maintainer: Nicolas Goaziou <mail@nicolasgoaziou.fr>
;; Keywords: org, wp, markdown

;; 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 a Markdown back-end (vanilla flavor) for
;; Org exporter, based on `html' back-end.  See Org manual for more
;; information.

;;; Code:

(require 'org-macs)
(unless (version< emacs-version "29")
  (org-assert-version))

(require 'cl-lib)
(require 'ox-html)
(require 'ox-publish)

\f
;;; User-Configurable Variables

(defgroup org-export-md nil
  "Options specific to Markdown export back-end."
  :tag "Org Markdown"
  :group 'org-export
  :version "24.4"
  :package-version '(Org . "8.0"))

(defcustom org-md-headline-style 'atx
  "Style used to format headlines.
This variable can be set to either `atx' or `setext'."
  :group 'org-export-md
  :type '(choice
	  (const :tag "Use \"atx\" style" atx)
	  (const :tag "Use \"Setext\" style" setext)))


;;;; Footnotes

(defcustom org-md-footnotes-section "%s%s"
  "Format string for the footnotes section.
The first %s placeholder will be replaced with the localized Footnotes section
heading, the second with the contents of the Footnotes section."
  :group 'org-export-md
  :type 'string
  :version "26.1"
  :package-version '(Org . "9.0"))

(defcustom org-md-footnote-format "<sup>%s</sup>"
  "Format string for the footnote reference.
The %s will be replaced by the footnote reference itself."
  :group 'org-export-md
  :type 'string
  :version "26.1"
  :package-version '(Org . "9.0"))

(defcustom org-md-toplevel-hlevel 1
  "Heading level to use for level 1 Org headings in markdown export.

If this is 1, headline levels will be preserved on export.  If this is
2, top level Org headings will be exported to level 2 markdown
headings, level 2 Org headings will be exported to level 3 markdown
headings, and so on.

Incrementing this value may be helpful when creating markdown to be
included into another document or application that reserves top-level
headings for its own use."
  :group 'org-export-md
  :package-version '(Org . "9.6")
  ;; Avoid `natnum' because that's not available until Emacs 28.1.
  :type 'integer)


\f
;;; Define Back-End

(org-export-define-derived-backend 'md 'html
  :filters-alist '((:filter-parse-tree . org-md-separate-elements))
  :menu-entry
  '(?m "Export to Markdown"
       ((?M "To temporary buffer"
	    (lambda (a s v b) (org-md-export-as-markdown a s v)))
	(?m "To file" (lambda (a s v b) (org-md-export-to-markdown a s v)))
	(?o "To file and open"
	    (lambda (a s v b)
	      (if a (org-md-export-to-markdown t s v)
		(org-open-file (org-md-export-to-markdown nil s v)))))))
  :translate-alist '((bold . org-md-bold)
		     (center-block . org-md--convert-to-html)
		     (code . org-md-verbatim)
		     (drawer . org-md--identity)
		     (dynamic-block . org-md--identity)
		     (example-block . org-md-example-block)
		     (export-block . org-md-export-block)
		     (fixed-width . org-md-example-block)
		     (headline . org-md-headline)
		     (horizontal-rule . org-md-horizontal-rule)
		     (inline-src-block . org-md-verbatim)
		     (inlinetask . org-md--convert-to-html)
		     (inner-template . org-md-inner-template)
		     (italic . org-md-italic)
		     (item . org-md-item)
		     (keyword . org-md-keyword)
                     (latex-environment . org-md-latex-environment)
                     (latex-fragment . org-md-latex-fragment)
		     (line-break . org-md-line-break)
		     (link . org-md-link)
		     (node-property . org-md-node-property)
		     (paragraph . org-md-paragraph)
		     (plain-list . org-md-plain-list)
		     (plain-text . org-md-plain-text)
		     (property-drawer . org-md-property-drawer)
		     (quote-block . org-md-quote-block)
		     (section . org-md-section)
		     (special-block . org-md--convert-to-html)
		     (src-block . org-md-example-block)
		     (table . org-md--convert-to-html)
		     (template . org-md-template)
		     (verbatim . org-md-verbatim))
  :options-alist
  '((:md-footnote-format nil nil org-md-footnote-format)
    (:md-footnotes-section nil nil org-md-footnotes-section)
    (:md-headline-style nil nil org-md-headline-style)
    (:md-toplevel-hlevel nil nil org-md-toplevel-hlevel)))

\f
;;; Filters

(defun org-md-separate-elements (tree _backend info)
  "Fix blank lines between elements.

TREE is the parse tree being exported.  BACKEND is the export
back-end used.  INFO is a plist used as a communication channel.

Enforce a blank line between elements.  There are two exceptions
to this rule:

  1. Preserve blank lines between sibling items in a plain list,

  2. In an item, remove any blank line before the very first
     paragraph and the next sub-list when the latter ends the
     current item.

Assume BACKEND is `md'."
  (org-element-map tree (remq 'item org-element-all-elements)
    (lambda (e)
      (org-element-put-property
       e :post-blank
       (if (and (eq (org-element-type e) 'paragraph)
		(eq (org-element-type (org-element-property :parent e)) 'item)
		(org-export-first-sibling-p e info)
		(let ((next (org-export-get-next-element e info)))
		  (and (eq (org-element-type next) 'plain-list)
		       (not (org-export-get-next-element next info)))))
	   0
	 1))))
  ;; Return updated tree.
  tree)

\f
;;; Internal functions

(defun org-md--headline-referred-p (headline info)
  "Non-nil when HEADLINE is being referred to.
INFO is a plist used as a communication channel.  Links and table
of contents can refer to headlines."
  (unless (org-element-property :footnote-section-p headline)
    (or
     ;; Global table of contents includes HEADLINE.
     (and (plist-get info :with-toc)
	  (memq headline
		(org-export-collect-headlines info (plist-get info :with-toc))))
     ;; A local table of contents includes HEADLINE.
     (cl-some
      (lambda (h)
	(let ((section (car (org-element-contents h))))
	  (and
	   (eq 'section (org-element-type section))
	   (org-element-map section 'keyword
	     (lambda (keyword)
	       (when (equal "TOC" (org-element-property :key keyword))
		 (let ((case-fold-search t)
		       (value (org-element-property :value keyword)))
		   (and (string-match-p "\\<headlines\\>" value)
			(let ((n (and
				  (string-match "\\<[0-9]+\\>" value)
				  (string-to-number (match-string 0 value))))
			      (local? (string-match-p "\\<local\\>" value)))
			  (memq headline
				(org-export-collect-headlines
				 info n (and local? keyword))))))))
	     info t))))
      (org-element-lineage headline))
     ;; A link refers internally to HEADLINE.
     (org-element-map (plist-get info :parse-tree) 'link
       (lambda (link)
	 (equal headline
                ;; Ignore broken links.
                (condition-case nil
                    (org-export-resolve-id-link link info)
                  (org-link-broken nil))))
       info t))))

(defun org-md--headline-title (style level title &optional anchor tags)
  "Generate a headline title in the preferred Markdown headline style.
STYLE is the preferred style (`atx' or `setext').  LEVEL is the
header level.  TITLE is the headline title.  ANCHOR is the HTML
anchor tag for the section as a string.  TAGS are the tags set on
the section."
  (let ((anchor-lines (and anchor (concat anchor "\n\n"))))
    ;; Use "Setext" style
    (if (and (eq style 'setext) (< level 3))
        (let* ((underline-char (if (= level 1) ?= ?-))
               (underline (concat (make-string (length title) underline-char)
				  "\n")))
          (concat "\n" anchor-lines title tags "\n" underline "\n"))
      ;; Use "Atx" style
      (let ((level-mark (make-string level ?#)))
        (concat "\n" anchor-lines level-mark " " title tags "\n\n")))))

(defun org-md--build-toc (info &optional n _keyword scope)
  "Return a table of contents.

INFO is a plist used as a communication channel.

Optional argument N, when non-nil, is an integer specifying the
depth of the table.

When optional argument SCOPE is non-nil, build a table of
contents according to the specified element."
  (concat
   (unless scope
     (let ((level (plist-get info :md-toplevel-hlevel))
           (style (plist-get info :md-headline-style))
	   (title (org-html--translate "Table of Contents" info)))
       (org-md--headline-title style level title nil)))
   (mapconcat
    (lambda (headline)
      (let* ((indentation
	      (make-string
	       (* 4 (1- (org-export-get-relative-level headline info)))
	       ?\s))
	     (bullet
	      (if (not (org-export-numbered-headline-p headline info)) "-   "
		(let ((prefix
		       (format "%d." (org-last (org-export-get-headline-number
						headline info)))))
		  (concat prefix (make-string (max 1 (- 4 (length prefix)))
					      ?\s)))))
	     (title
	      (format "[%s](#%s)"
		      (org-export-data-with-backend
		       (org-export-get-alt-title headline info)
		       (org-export-toc-entry-backend 'md)
		       info)
		      (or (org-element-property :CUSTOM_ID headline)
			  (org-export-get-reference headline info))))
	     (tags (and (plist-get info :with-tags)
			(not (eq 'not-in-toc (plist-get info :with-tags)))
			(org-make-tag-string
			 (org-export-get-tags headline info)))))
	(concat indentation bullet title tags)))
    (org-export-collect-headlines info n scope) "\n")
   "\n"))

(defun org-md--footnote-formatted (footnote info)
  "Formats a single footnote entry FOOTNOTE.
FOOTNOTE is a cons cell of the form (number . definition).
INFO is a plist with contextual information."
  (let* ((fn-num (car footnote))
         (fn-text (cdr footnote))
         (fn-format (plist-get info :md-footnote-format))
         (fn-anchor (format "fn.%d" fn-num))
         (fn-href (format " href=\"#fnr.%d\"" fn-num))
         (fn-link-to-ref (org-html--anchor fn-anchor fn-num fn-href info)))
    (concat (format fn-format fn-link-to-ref) " " fn-text "\n")))

(defun org-md--footnote-section (info)
  "Format the footnote section.
INFO is a plist used as a communication channel."
  (let* ((fn-alist (org-export-collect-footnote-definitions info))
         (fn-alist (cl-loop for (n _type raw) in fn-alist collect
                            (cons n (org-trim (org-export-data raw info)))))
         (headline-style (plist-get info :md-headline-style))
         (section-title (org-html--translate "Footnotes" info)))
    (when fn-alist
      (format (plist-get info :md-footnotes-section)
              (org-md--headline-title headline-style 1 section-title)
              (mapconcat (lambda (fn) (org-md--footnote-formatted fn info))
                         fn-alist
                         "\n")))))

(defun org-md--convert-to-html (datum _contents info)
  "Convert DATUM into raw HTML, including contents."
  (org-export-data-with-backend datum 'html info))

(defun org-md--identity (_datum contents _info)
  "Return CONTENTS only."
  contents)

\f
;;; Transcode Functions

;;;; Bold

(defun org-md-bold (_bold contents _info)
  "Transcode BOLD object into Markdown format.
CONTENTS is the text within bold markup.  INFO is a plist used as
a communication channel."
  (format "**%s**" contents))


;;;; Code and Verbatim

(defun org-md-verbatim (verbatim _contents _info)
  "Transcode VERBATIM object into Markdown format.
CONTENTS is nil.  INFO is a plist used as a communication
channel."
  (let ((value (org-element-property :value verbatim)))
    (format (cond ((not (string-match "`" value)) "`%s`")
		  ((or (string-prefix-p "`" value)
		       (string-suffix-p "`" value))
		   "`` %s ``")
		  (t "``%s``"))
	    value)))


;;;; Example Block, Src Block and Export Block

(defun org-md-example-block (example-block _contents info)
  "Transcode EXAMPLE-BLOCK element into Markdown format.
CONTENTS is nil.  INFO is a plist used as a communication
channel."
  (replace-regexp-in-string
   "^" "    "
   (org-remove-indentation
    (org-export-format-code-default example-block info))))

(defun org-md-export-block (export-block contents info)
  "Transcode a EXPORT-BLOCK element from Org to Markdown.
CONTENTS is nil.  INFO is a plist holding contextual information."
  (if (member (org-element-property :type export-block) '("MARKDOWN" "MD"))
      (org-remove-indentation (org-element-property :value export-block))
    ;; Also include HTML export blocks.
    (org-export-with-backend 'html export-block contents info)))


;;;; Headline

(defun org-md-headline (headline contents info)
  "Transcode HEADLINE element into Markdown format.
CONTENTS is the headline contents.  INFO is a plist used as
a communication channel."
  (unless (org-element-property :footnote-section-p headline)
    (let* ((level (+ (org-export-get-relative-level headline info)
                     (1- (plist-get info :md-toplevel-hlevel))))
	   (title (org-export-data (org-element-property :title headline) info))
	   (todo (and (plist-get info :with-todo-keywords)
		      (let ((todo (org-element-property :todo-keyword
							headline)))
			(and todo (concat (org-export-data todo info) " ")))))
	   (tags (and (plist-get info :with-tags)
		      (let ((tag-list (org-export-get-tags headline info)))
			(and tag-list
			     (concat "     " (org-make-tag-string tag-list))))))
	   (priority
	    (and (plist-get info :with-priority)
		 (let ((char (org-element-property :priority headline)))
		   (and char (format "[#%c] " char)))))
	   ;; Headline text without tags.
	   (heading (concat todo priority title))
	   (style (plist-get info :md-headline-style)))
      (cond
       ;; Cannot create a headline.  Fall-back to a list.
       ((or (org-export-low-level-p headline info)
	    (not (memq style '(atx setext)))
	    (and (eq style 'atx) (> level 6))
	    (and (eq style 'setext) (> level 2)))
	(let ((bullet
	       (if (not (org-export-numbered-headline-p headline info)) "-"
		 (concat (number-to-string
			  (car (last (org-export-get-headline-number
				      headline info))))
			 "."))))
	  (concat bullet (make-string (- 4 (length bullet)) ?\s) heading tags "\n\n"
		  (and contents (replace-regexp-in-string "^" "    " contents)))))
       (t
	(let ((anchor
	       (and (org-md--headline-referred-p headline info)
		    (format "<a id=\"%s\"></a>"
			    (or (org-element-property :CUSTOM_ID headline)
				(org-export-get-reference headline info))))))
	  (concat (org-md--headline-title style level heading anchor tags)
		  contents)))))))

;;;; Horizontal Rule

(defun org-md-horizontal-rule (_horizontal-rule _contents _info)
  "Transcode HORIZONTAL-RULE element into Markdown format.
CONTENTS is the horizontal rule contents.  INFO is a plist used
as a communication channel."
  "---")


;;;; Italic

(defun org-md-italic (_italic contents _info)
  "Transcode ITALIC object into Markdown format.
CONTENTS is the text within italic markup.  INFO is a plist used
as a communication channel."
  (format "*%s*" contents))


;;;; Item

(defun org-md-item (item contents info)
  "Transcode ITEM element into Markdown format.
CONTENTS is the item contents.  INFO is a plist used as
a communication channel."
  (let* ((type (org-element-property :type (org-export-get-parent item)))
	 (struct (org-element-property :structure item))
	 (bullet (if (not (eq type 'ordered)) "-"
		   (concat (number-to-string
			    (car (last (org-list-get-item-number
					(org-element-property :begin item)
					struct
					(org-list-prevs-alist struct)
					(org-list-parents-alist struct)))))
			   "."))))
    (concat bullet
	    (make-string (- 4 (length bullet)) ? )
	    (pcase (org-element-property :checkbox item)
	      (`on "[X] ")
	      (`trans "[-] ")
	      (`off "[ ] "))
	    (let ((tag (org-element-property :tag item)))
	      (and tag (format "**%s:** "(org-export-data tag info))))
	    (and contents
		 (org-trim (replace-regexp-in-string "^" "    " contents))))))



;;;; Keyword

(defun org-md-keyword (keyword contents info)
  "Transcode a KEYWORD element into Markdown format.
CONTENTS is nil.  INFO is a plist used as a communication
channel."
  (pcase (org-element-property :key keyword)
    ((or "MARKDOWN" "MD") (org-element-property :value keyword))
    ("TOC"
     (let ((case-fold-search t)
	   (value (org-element-property :value keyword)))
       (cond
	((string-match-p "\\<headlines\\>" value)
	 (let ((depth (and (string-match "\\<[0-9]+\\>" value)
			   (string-to-number (match-string 0 value))))
	       (scope
		(cond
		 ((string-match ":target +\\(\".+?\"\\|\\S-+\\)" value) ;link
		  (org-export-resolve-link
		   (org-strip-quotes (match-string 1 value)) info))
		 ((string-match-p "\\<local\\>" value) keyword)))) ;local
	   (org-remove-indentation
	    (org-md--build-toc info depth keyword scope)))))))
    (_ (org-export-with-backend 'html keyword contents info))))


;;;; LaTeX Environment

(defun org-md-latex-environment (latex-environment _contents info)
  "Transcode a LATEX-ENVIRONMENT object from Org to Markdown.
CONTENTS is nil.  INFO is a plist holding contextual information."
  (when (plist-get info :with-latex)
    (let ((latex-frag (org-remove-indentation
                       (org-element-property :value latex-environment)))
          (label (org-html--reference latex-environment info t)))
      (if (org-string-nw-p label)
          (replace-regexp-in-string "\\`.*"
                                    (format "\\&\n\\\\label{%s}" label)
                                    latex-frag)
        latex-frag))))

;;;; LaTeX Fragment

(defun org-md-latex-fragment (latex-fragment _contents info)
  "Transcode a LATEX-FRAGMENT object from Org to Markdown.
CONTENTS is nil.  INFO is a plist holding contextual information."
  (when (plist-get info :with-latex)
    (let ((frag (org-element-property :value latex-fragment)))
      (cond
       ((string-match-p "^\\\\(" frag)
        (concat "$" (substring frag 2 -2) "$"))
       ((string-match-p "^\\\\\\[" frag)
        (concat "$$" (substring frag 2 -2) "$$"))
       (t frag))))) ; either already $-deliminated or a macro

;;;; Line Break

(defun org-md-line-break (_line-break _contents _info)
  "Transcode LINE-BREAK object into Markdown format.
CONTENTS is nil.  INFO is a plist used as a communication
channel."
  "  \n")


;;;; Link

(defun org-md-link (link desc info)
  "Transcode LINK object into Markdown format.
DESC is the description part of the link, or the empty string.
INFO is a plist holding contextual information.  See
`org-export-data'."
  (let* ((link-org-files-as-md
	  (lambda (raw-path)
	    ;; Treat links to `file.org' as links to `file.md'.
	    (if (string= ".org" (downcase (file-name-extension raw-path ".")))
		(concat (file-name-sans-extension raw-path) ".md")
	      raw-path)))
	 (type (org-element-property :type link))
	 (raw-path (org-element-property :path link))
	 (path (cond
		((member type '("http" "https" "ftp" "mailto"))
		 (concat type ":" raw-path))
		((string-equal  type "file")
		 (org-export-file-uri (funcall link-org-files-as-md raw-path)))
		(t raw-path))))
    (cond
     ;; Link type is handled by a special function.
     ((org-export-custom-protocol-maybe link desc 'md info))
     ((member type '("custom-id" "id" "fuzzy"))
      (let ((destination (if (string= type "fuzzy")
			     (org-export-resolve-fuzzy-link link info)
			   (org-export-resolve-id-link link info))))
	(pcase (org-element-type destination)
	  (`plain-text			; External file.
	   (let ((path (funcall link-org-files-as-md destination)))
	     (if (not desc) (format "<%s>" path)
	       (format "[%s](%s)" desc path))))
	  (`headline
	   (format
	    "[%s](#%s)"
	    ;; Description.
	    (cond ((org-string-nw-p desc))
		  ((org-export-numbered-headline-p destination info)
		   (mapconcat #'number-to-string
			      (org-export-get-headline-number destination info)
			      "."))
		  (t (org-export-data (org-element-property :title destination)
				      info)))
	    ;; Reference.
	    (or (org-element-property :CUSTOM_ID destination)
		(org-export-get-reference destination info))))
	  (_
	   (let ((description
		  (or (org-string-nw-p desc)
		      (let ((number (org-export-get-ordinal destination info)))
			(cond
			 ((not number) nil)
			 ((atom number) (number-to-string number))
			 (t (mapconcat #'number-to-string number ".")))))))
	     (when description
	       (format "[%s](#%s)"
		       description
		       (org-export-get-reference destination info))))))))
     ((org-export-inline-image-p link org-html-inline-image-rules)
      (let ((path (cond ((not (string-equal type "file"))
			 (concat type ":" raw-path))
			((not (file-name-absolute-p raw-path)) raw-path)
			(t (expand-file-name raw-path))))
	    (caption (org-export-data
		      (org-export-get-caption
		       (org-export-get-parent-element link))
		      info)))
	(format "![img](%s)"
		(if (not (org-string-nw-p caption)) path
		  (format "%s \"%s\"" path caption)))))
     ((string= type "coderef")
      (format (org-export-get-coderef-format path desc)
	      (org-export-resolve-coderef path info)))
     ((string= type "radio")
      (let ((destination (org-export-resolve-radio-link link info)))
	(if (not destination) desc
	  (format "<a href=\"#%s\">%s</a>"
		  (org-export-get-reference destination info)
		  desc))))
     (t (if (not desc) (format "<%s>" path)
	  (format "[%s](%s)" desc path))))))


;;;; Node Property

(defun org-md-node-property (node-property _contents _info)
  "Transcode a NODE-PROPERTY element into Markdown syntax.
CONTENTS is nil.  INFO is a plist holding contextual
information."
  (format "%s:%s"
          (org-element-property :key node-property)
          (let ((value (org-element-property :value node-property)))
            (if value (concat " " value) ""))))


;;;; Paragraph

(defun org-md-paragraph (paragraph contents _info)
  "Transcode PARAGRAPH element into Markdown format.
CONTENTS is the paragraph contents.  INFO is a plist used as
a communication channel."
  (let ((first-object (car (org-element-contents paragraph))))
    ;; If paragraph starts with a #, protect it.
    (if (and (stringp first-object) (string-prefix-p "#" first-object))
	(concat "\\" contents)
      contents)))


;;;; Plain List

(defun org-md-plain-list (_plain-list contents _info)
  "Transcode PLAIN-LIST element into Markdown format.
CONTENTS is the plain-list contents.  INFO is a plist used as
a communication channel."
  contents)


;;;; Plain Text

(defun org-md-plain-text (text info)
  "Transcode a TEXT string into Markdown format.
TEXT is the string to transcode.  INFO is a plist holding
contextual information."
  (when (plist-get info :with-smart-quotes)
    (setq text (org-export-activate-smart-quotes text :html info)))
  ;; The below series of replacements in `text' is order sensitive.
  ;; Protect `, *, _, and \
  (setq text (replace-regexp-in-string "[`*_\\]" "\\\\\\&" text))
  ;; Protect ambiguous #.  This will protect # at the beginning of
  ;; a line, but not at the beginning of a paragraph.  See
  ;; `org-md-paragraph'.
  (setq text (replace-regexp-in-string "\n#" "\n\\\\#" text))
  ;; Protect ambiguous !
  (setq text (replace-regexp-in-string "\\(!\\)\\[" "\\\\!" text nil nil 1))
  ;; Handle special strings, if required.
  (when (plist-get info :with-special-strings)
    (setq text (org-html-convert-special-strings text)))
  ;; Handle break preservation, if required.
  (when (plist-get info :preserve-breaks)
    (setq text (replace-regexp-in-string "[ \t]*\n" "  \n" text)))
  ;; Return value.
  text)


;;;; Property Drawer

(defun org-md-property-drawer (_property-drawer contents _info)
  "Transcode a PROPERTY-DRAWER element into Markdown format.
CONTENTS holds the contents of the drawer.  INFO is a plist
holding contextual information."
  (and (org-string-nw-p contents)
       (replace-regexp-in-string "^" "    " contents)))


;;;; Quote Block

(defun org-md-quote-block (_quote-block contents _info)
  "Transcode QUOTE-BLOCK element into Markdown format.
CONTENTS is the quote-block contents.  INFO is a plist used as
a communication channel."
  (replace-regexp-in-string
   "^" "> "
   (replace-regexp-in-string "\n\\'" "" contents)))


;;;; Section

(defun org-md-section (_section contents _info)
  "Transcode SECTION element into Markdown format.
CONTENTS is the section contents.  INFO is a plist used as
a communication channel."
  contents)


;;;; Template

(defun org-md-inner-template (contents info)
  "Return body of document after converting it to Markdown syntax.
CONTENTS is the transcoded contents string.  INFO is a plist
holding export options."
  ;; Make sure CONTENTS is separated from table of contents and
  ;; footnotes with at least a blank line.
  (concat
   ;; Table of contents.
   (let ((depth (plist-get info :with-toc)))
     (when depth
       (concat (org-md--build-toc info (and (wholenump depth) depth)) "\n")))
   ;; Document contents.
   contents
   "\n"
   ;; Footnotes section.
   (org-md--footnote-section info)))

(defun org-md-template (contents _info)
  "Return complete document string after Markdown conversion.
CONTENTS is the transcoded contents string.  INFO is a plist used
as a communication channel."
  contents)


\f
;;; Interactive function

;;;###autoload
(defun org-md-export-as-markdown (&optional async subtreep visible-only)
  "Export current buffer to a Markdown buffer.

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 buffer 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.

Export is done in a buffer named \"*Org MD Export*\", which will
be displayed when `org-export-show-temporary-export-buffer' is
non-nil."
  (interactive)
  (org-export-to-buffer 'md "*Org MD Export*"
    async subtreep visible-only nil nil (lambda () (text-mode))))

;;;###autoload
(defun org-md-convert-region-to-md ()
  "Assume the current region has Org syntax, and convert it to Markdown.
This can be used in any buffer.  For example, you can write an
itemized list in Org syntax in a Markdown buffer and use
this command to convert it."
  (interactive)
  (org-export-replace-region-by 'md))


;;;###autoload
(defun org-md-export-to-markdown (&optional async subtreep visible-only)
  "Export current buffer to a Markdown 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.

Return output file's name."
  (interactive)
  (let ((outfile (org-export-output-file-name ".md" subtreep)))
    (org-export-to-file 'md outfile async subtreep visible-only)))

;;;###autoload
(defun org-md-publish-to-md (plist filename pub-dir)
  "Publish an org file to Markdown.

FILENAME is the filename of the Org file to be published.  PLIST
is the property list for the given project.  PUB-DIR is the
publishing directory.

Return output file name."
  (org-publish-org-to 'md filename ".md" plist pub-dir))

(provide 'ox-md)

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

;;; ox-md.el ends here

debug log:

solving 95fa40a8f ...
found 95fa40a8f in https://yhetil.org/orgmode/87o7obn0dp.fsf@localhost/
found 5be0ca22e in https://git.savannah.gnu.org/cgit/emacs/org-mode.git
preparing index
index prepared:
100644 5be0ca22e07255c20da4eb9caa269bf04cb16994	lisp/ox-md.el

applying [1/1] https://yhetil.org/orgmode/87o7obn0dp.fsf@localhost/
diff --git a/lisp/ox-md.el b/lisp/ox-md.el
index 5be0ca22e..95fa40a8f 100644

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

index at:
100644 95fa40a8fd9aa220cc51cd0252bc4708fb6fe2b8	lisp/ox-md.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).