Retain markup in titles when deriving them for internal/x-post links

ox-hugo.el

@@ -1997,8 +1997,10 @@ and rewrite link paths to make blogging more seamless."
                (format "<%s>" path))))
           (`headline                 ;Links of type [[* Some heading]]
            (let ((title (org-hugo--sanitize-title
-                         info (org-element-property :title destination))))
-             ;; (message "[ox-hugo-link DBG] headline title: %s" title)
+                         info (org-element-property :title destination) 'md)))
+             ;; (message "[ox-hugo-link DBG] headline title pre sanitize: %s"
+             ;;          (org-export-data (org-element-property :title destination) info))
+             ;; (message "[ox-hugo-link DBG] headline title post sanitize: %s" title)
              (format
               "[%s](#%s)"
               ;; Description
@@ -2951,7 +2953,7 @@ to ((name . \"foo\") (weight . 80))."
           (push cell valid-menu-alist))))
     valid-menu-alist))
 
-(defun org-hugo--sanitize-title (info &optional title)
+(defun org-hugo--sanitize-title (info &optional title backend)
   "Return sanitized version of an Org headline TITLE.
 
 INFO is a plist used as a communication channel.
@@ -2966,22 +2968,26 @@ If TITLE is non-nil, ignore the value of
 `org-export-with-title'. When non-nil, TITLE is the object
 returned by `org-element-property'.
 
-The title string is returned in a markup-free \"raw\" form."
+If BACKEND is nil, return the TITLE without any markup
+characters, else export it using the BACKEND."
   (unless title
     (when (plist-get info :with-title)
       (setq title (plist-get info :title))))
 
-  ;; "Raw" backend that returns emphasis elements without any markup
-  ;; characters -- http://lists.gnu.org/r/emacs-orgmode/2017-12/msg00490.html
-  (let* ((raw-backend (let ((get-raw (lambda (object contents _)
+  (let* ((backend (or backend
+                      ;; "Raw" backend that returns emphasis elements
+                      ;; without any markup characters --
+                      ;; http://lists.gnu.org/r/emacs-orgmode/2017-12/msg00490.html
+                      (let ((get-raw (lambda (object contents _)
                                        (or contents
                                            (org-element-property :value object)))))
                         (org-export-create-backend
                          :parent 'ascii
                          :transcoders (mapcar (lambda (type)
                                                 (cons type get-raw))
-                                              '(bold code italic strike-through underline verbatim)))))
-         (title (org-export-data-with-backend title raw-backend info))
+                                              '(bold code italic strike-through
+                                                     underline verbatim))))))
+         (title (org-export-data-with-backend title backend info))
          ;; Hugo does not render Markdown in the titles and so the
          ;; Blackfriday smartDashes conversion does not work there.  So
          ;; do that here instead.  Convert "---" to EM DASH, "--" to EN
@@ -3950,7 +3956,7 @@ links."
                                  (equal 'headline destination-type))
                         (let ((headline-title
                                (org-hugo--sanitize-title
-                                info (org-element-property :title destination))))
+                                info (org-element-property :title destination) 'ascii)))
                           ;; (message "[ox-hugo pre process DBG] destination heading: %s" headline-title)
                           (org-element-set-contents link-copy headline-title)))
                       (org-element-set-element link link-copy))))))))

test/site/content-org/all-posts.org

@@ -2906,18 +2906,18 @@ Once that is evaluated, links like these will export fine i.e. no
 :END:
 - Link (with description) to a heading with section number: [[* Beta 102][Link to
  /Beta 102/ heading]]
-- Link (no description) to a heading without section number: [[* Zeta
-  103]].
+- Link (no description) to a heading without section number: [[* Zeta 103
+  which has *some markup*]].
 
   The space after that =*= in the link is optional.. so this also
-  works: [[*Zeta 103]].
+  works: [[*Zeta 103 which has *some markup*]].
 **** Beta 102
 - Link (with description) to a heading without section number: [[* Alpha 101][Link to
  /Alpha 101/ heading]]
 ***** Gamma 102.1
 ****** Delta 102.1.1
 ****** Epsilon 102.1.2
-**** Zeta 103
+**** Zeta 103 which has *some markup*
 :PROPERTIES:
 :UNNUMBERED: t
 :END:

test/site/content/posts/link-to-headings-by-name.md

@@ -19,7 +19,7 @@ draft = false
     - <span class="section-num">1.1</span> [Gamma 102.1](#gamma-102-dot-1)
         - <span class="section-num">1.1.1</span> [Delta 102.1.1](#delta-102-dot-1-dot-1)
         - <span class="section-num">1.1.2</span> [Epsilon 102.1.2](#epsilon-102-dot-1-dot-2)
-- [Zeta 103](#zeta-103)
+- [Zeta 103 which has **some markup**](#zeta-103-which-has-some-markup)
     - [Links (no descriptions) to headings with section numbers](#links--no-descriptions--to-headings-with-section-numbers)
 
 </div>
@@ -30,10 +30,10 @@ draft = false
 
 -   Link (with description) to a heading with section number: [Link to
     _Beta 102_ heading](#beta-102)
--   Link (no description) to a heading without section number: [Zeta 103](#zeta-103).
+-   Link (no description) to a heading without section number: [Zeta 103 which has **some markup**](#zeta-103-which-has-some-markup).
 
     The space after that `*` in the link is optional.. so this also
-    works: [Zeta 103](#zeta-103).
+    works: [Zeta 103 which has **some markup**](#zeta-103-which-has-some-markup).
 
 
 ## <span class="section-num">1</span> Beta 102 {#beta-102}
@@ -51,7 +51,7 @@ draft = false
 #### <span class="section-num">1.1.2</span> Epsilon 102.1.2 {#epsilon-102-dot-1-dot-2}
 
 
-## Zeta 103 {#zeta-103}
+## Zeta 103 which has **some markup** {#zeta-103-which-has-some-markup}
 
 
 ### Links (no descriptions) to headings with section numbers {#links--no-descriptions--to-headings-with-section-numbers}

test/site/content/posts/links-outside-the-same-post.md

@@ -30,7 +30,7 @@ init file.
 -   [Link to CUSTOM\_ID within the same post](#internal-target)
 -   [Link to ID within the same post](#internal-target)
 -   [Link to headline within the same post](#internal-target)
--   [Link to target within the same post](#org5518ced)
+-   [Link to target within the same post](#org7d2d8b5)
 
 
 ## Cross-post links {#cross-post-links}
@@ -49,7 +49,7 @@ resolved to the containing post.
 -   Link to CUSTOM\_ID outside the same post: [External target]({{< relref "link-destination#external-target" >}})
 -   Link to ID outside the same post: [External target]({{< relref "link-destination#external-target" >}})
 -   Link to target outside the same post: [External target]({{< relref "link-destination#external-target" >}})
--   Another link to target outside the same post: [External target with bold and italic]({{< relref "link-destination#external-target-with-bold-and-italic" >}})
+-   Another link to target outside the same post: [External target with **bold** and _italic_]({{< relref "link-destination#external-target-with-bold-and-italic" >}})
 -   Link to subtree by CUSTOM\_ID: [Link destination]({{< relref "link-destination" >}})
 -   Link to subtree by ID: [Link destination]({{< relref "link-destination" >}})
 -   Link to subtree by headline: [Link destination]({{< relref "link-destination" >}})
@@ -68,7 +68,7 @@ resolved to the containing post.
 
 ## Internal target {#internal-target}
 
-<a id="org5518ced"></a>
+<a id="org7d2d8b5"></a>
 
 
 ## Link destination {#link-destination}
@@ -76,7 +76,7 @@ resolved to the containing post.
 
 ### External target {#external-target}
 
-<a id="org1b9b4fd"></a>
+<a id="orga9009ef"></a>
 
 
 ### External target with **bold** and _italic_ {#external-target-with-bold-and-italic}