[PATCH] Suggestion to self-link headlines exported to HTML

[Toon Claes <toon@iotcl.com>]

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Hi,

Recently I wrote a blog post on making headlines clickable when Org mode
is exported to HTML:
https://writepermission.com/org-blogging-clickable-headlines.html

With this mail, I'd like to suggest a change to bring this feature to
the Org mode core.

It's my first contribution to Org mode, but I've already completed the
paperwork to contribute to Emacs core in the past.

Of course any comment is welcome.

-- Toon



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From 5b279778326d844b6dd2895dba7eae2c096056cc Mon Sep 17 00:00:00 2001
From: Toon Claes <toon@iotcl.com>
Date: Sun, 16 Dec 2018 21:55:40 +0100
Subject: [PATCH] ox-html: Make it possible to self link headlines

* lisp/ox-html.el (org-html-self-link-headlines): New variable.
  (org-html-headline): Create a hyperlink on headlines
  when :html-self-link-headlines is set.
---
 doc/org-manual.org |  1 +
 etc/ORG-NEWS       |  5 +++++
 lisp/ox-html.el    | 18 +++++++++++++++---
 3 files changed, 21 insertions(+), 3 deletions(-)

diff --git a/doc/org-manual.org b/doc/org-manual.org
index 59e31d8b3..4f00655fa 100644
--- a/doc/org-manual.org
+++ b/doc/org-manual.org
@@ -15610,6 +15610,7 @@ Settings]]), however, override everything.
 | ~:html-postamble~                              | ~org-html-postamble~                              |
 | ~:html-preamble-format~                        | ~org-html-preamble-format~                        |
 | ~:html-preamble~                               | ~org-html-preamble~                               |
+| ~:html-self-link-headlines~                    | ~org-html-self-link-headlines~                    |
 | ~:html-table-align-individual-field~           | ~de{org-html-table-align-individual-fields~       |
 | ~:html-table-attributes~                       | ~org-html-table-default-attributes~               |
 | ~:html-table-caption-above~                    | ~org-html-table-caption-above~                    |
diff --git a/etc/ORG-NEWS b/etc/ORG-NEWS
index 811e98147..817d6eacc 100644
--- a/etc/ORG-NEWS
+++ b/etc/ORG-NEWS
@@ -312,6 +312,11 @@ beginning of a headline when using Org speed commands.  Now, if there
 is already a restriction at point, hitting =<= again (or =C-x C-x <=) will
 remove it.
 
+*** Headlines can now link to themselves in HTML export
+
+When enabling ~org-html-self-link-headlines~ the headlines exported to
+HTML contain a hyperlink to themselves.
+
 ** New commands and functions
 
 *** ~org-insert-structure-template~
diff --git a/lisp/ox-html.el b/lisp/ox-html.el
index b4ec25786..826d97a5d 100644
--- a/lisp/ox-html.el
+++ b/lisp/ox-html.el
@@ -152,6 +152,7 @@
     (:html-metadata-timestamp-format nil nil org-html-metadata-timestamp-format)
     (:html-postamble-format nil nil org-html-postamble-format)
     (:html-preamble-format nil nil org-html-preamble-format)
+    (:html-self-link-headlines nil nil org-html-self-link-headlines)
     (:html-table-align-individual-fields
      nil nil org-html-table-align-individual-fields)
     (:html-table-caption-above nil nil org-html-table-caption-above)
@@ -802,6 +803,13 @@ but without \"name\" attribute."
   :package-version '(Org . "8.0")
   :type 'boolean)
 
+(defcustom org-html-self-link-headlines nil
+  "When set, the headlines contain a hyperlink to themselves."
+  :group 'org-export-html
+  :version "27.1"
+  :package-version '(Org . "9.2")
+  :type 'boolean)
+
 ;;;; Inlinetasks
 
 (defcustom org-html-format-inlinetask-function
@@ -2592,7 +2600,11 @@ holding contextual information."
                                todo todo-type priority text tags info))
            (contents (or contents ""))
 	   (id (or (org-element-property :CUSTOM_ID headline)
-		   (org-export-get-reference headline info))))
+		   (org-export-get-reference headline info)))
+	   (formatted-text
+	    (if (and id (plist-get info :html-self-link-headlines))
+		(format "<a href=\"#%s\">%s</a>" id full-text)
+	      text)))
       (if (org-export-low-level-p headline info)
           ;; This is a deep sub-tree: export it as a list item.
           (let* ((html-type (if numberedp "ol" "ul")))
@@ -2603,7 +2615,7 @@ holding contextual information."
 	     (org-html-format-list-item
 	      contents (if numberedp 'ordered 'unordered)
 	      nil info nil
-	      (concat (org-html--anchor id nil nil info) full-text)) "\n"
+	      (concat (org-html--anchor id nil nil info) formatted-text)) "\n"
 	     (and (org-export-last-sibling-p headline info)
 		  (format "</%s>\n" html-type))))
 	;; Standard headline.  Export it as a section.
@@ -2625,7 +2637,7 @@ holding contextual information."
                                  "<span class=\"section-number-%d\">%s</span> "
                                  level
                                  (mapconcat #'number-to-string numbers ".")))
-                           full-text)
+                           formatted-text)
                           level)
                   ;; When there is no section, pretend there is an
                   ;; empty one to get the correct <div
-- 
2.19.0.rc0.2.g29d9e3e2c.dirty


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