From a7c078e4b5f3d97fa7db0e1df192e26e6953ef71 Mon Sep 17 00:00:00 2001
From: Brian Powell <powellb@hawaii.edu>
Date: Sun, 19 Apr 2020 12:59:53 -1000
Subject: [PATCH] add org-html-equation-reference-format to customize MathJax
 ref command

---
 doc/org-manual.org |  1 +
 lisp/ox-html.el    | 23 ++++++++++++++++++++---
 2 files changed, 21 insertions(+), 3 deletions(-)

diff --git a/doc/org-manual.org b/doc/org-manual.org
index 6d5a34e56..4b1a14ef4 100644
--- a/doc/org-manual.org
+++ b/doc/org-manual.org
@@ -15851,6 +15851,7 @@ Settings]]), however, override everything.
 | ~:html-link-use-abs-url~                       | ~org-html-link-use-abs-url~                       |
 | ~:html-mathjax-options~                        | ~org-html-mathjax-options~                        |
 | ~:html-mathjax-template~                       | ~org-html-mathjax-template~                       |
+| ~:html-equation-reference-format~              | ~org-html-equation-reference-format~              |
 | ~:html-metadata-timestamp-format~              | ~org-html-metadata-timestamp-format~              |
 | ~:html-postamble-format~                       | ~org-html-postamble-format~                       |
 | ~:html-postamble~                              | ~org-html-postamble~                              |
diff --git a/lisp/ox-html.el b/lisp/ox-html.el
index e70b8279b..0565d47f0 100644
--- a/lisp/ox-html.el
+++ b/lisp/ox-html.el
@@ -121,6 +121,7 @@
     (:html-link-home "HTML_LINK_HOME" nil org-html-link-home)
     (:html-link-up "HTML_LINK_UP" nil org-html-link-up)
     (:html-mathjax "HTML_MATHJAX" nil "" space)
+    (:html-equation-reference-format "HTML_EQUATION_REFERENCE_FORMAT" nil org-html-equation-reference-format t)
     (:html-postamble nil "html-postamble" org-html-postamble)
     (:html-preamble nil "html-preamble" org-html-preamble)
     (:html-head "HTML_HEAD" nil org-html-head newline)
@@ -761,6 +762,22 @@ The function should return the string to be exported."
 
 ;;;; LaTeX
 
+(defcustom org-html-equation-reference-format "\\eqref{%s}"
+  "MathJax command to use when referencing equations. This is a
+format controls string, expecting a single argument, the equation
+being referenced that is generated on export.
+
+Default is to wrap equations in parentheses (using \"\\eqref{%s}\)\".
+
+Most common values are:
+
+  \"\\eqref{%s}\"    Wrap the equation in parentheses
+  \"\\ref{%s}\"      Do not wrap the equation in parentheses"
+  :group 'org-export-html
+  :package-version '(Org . "9.4")
+  :type 'string
+  :safe t)
+
 (defcustom org-html-with-latex org-export-with-latex
   "Non-nil means process LaTeX math snippets.
 
@@ -3113,9 +3130,9 @@ INFO is a plist holding contextual information.  See
                     (eq 'latex-environment (org-element-type destination))
                     (eq 'math (org-latex--environment-type destination)))
                ;; Caption and labels are introduced within LaTeX
-	       ;; environment.  Use "eqref" macro to refer to those in
-	       ;; the document.
-               (format "\\eqref{%s}"
+	       ;; environment.  Use "ref" or "eqref" macro, depending on user
+               ;; preference to refer to those in the document.
+               (format (plist-get info :html-equation-reference-format)
                        (org-export-get-reference destination info))
              (let* ((ref (org-export-get-reference destination info))
                     (org-html-standalone-image-predicate
-- 
2.26.0