From 75c849cf984a1064a62585877afbbdb4e9581717 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Micka=C3=ABl=20V=C3=A9ril?= <mveril@irsamc.ups-tlse.fr>
Date: Tue, 28 Apr 2020 17:27:22 +0200
Subject: [PATCH] Downgrade to MathJax 2.7 to fix the \ce problem and add
 MathJaxPolyfill.js to add the typesetPromise() function that is missing in
 the V2 API

---
 layouts/partials/head_custom.html | 14 ++++++++++++--
 static/js/MathJaxPolyfill.js      |  8 ++++++++
 2 files changed, 20 insertions(+), 2 deletions(-)
 create mode 100644 static/js/MathJaxPolyfill.js

diff --git a/layouts/partials/head_custom.html b/layouts/partials/head_custom.html
index 1ffe2c29..6510406f 100644
--- a/layouts/partials/head_custom.html
+++ b/layouts/partials/head_custom.html
@@ -2,9 +2,19 @@
 <link rel="stylesheet" href="https://unpkg.com/tippy.js@5/dist/backdrop.css" />
 <link rel="stylesheet" href="https://unpkg.com/tippy.js@5/themes/light.css" />
 <script src="https://unpkg.com/tippy.js@5"></script>
+<script  type="text/x-mathjax-config">
+  MathJax.Ajax.config.path["mhchem"] =
+  "https://cdnjs.cloudflare.com/ajax/libs/mathjax-mhchem/3.3.2";
+MathJax.Hub.Config({
+  TeX: {
+    extensions: ["[mhchem]/mhchem.js"]
+  }
+});
+</script>
 <script src="https://cdn.plot.ly/plotly-latest.min.js"></script>
 <script src="/js/MathJaxUtils.js"></script>
-<script type="text/javascript" id="MathJax-script" async
-  src="https://cdn.jsdelivr.net/npm/mathjax@3/es5/tex-mml-chtml.js">
+<script src="/js/MathJaxPolyfill.js"></script>
+<script type="text/javascript" async
+  src="https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.7/MathJax.js?config=TeX-MML-AM_CHTML" onload="MathJaxPolyfillInit()">
 </script>
 <script src="https://cdn.rawgit.com/larsgw/citation.js/archive/citation.js/citation-0.4.0-9.js" type="text/javascript"></script>
\ No newline at end of file
diff --git a/static/js/MathJaxPolyfill.js b/static/js/MathJaxPolyfill.js
new file mode 100644
index 00000000..6c09d8ce
--- /dev/null
+++ b/static/js/MathJaxPolyfill.js
@@ -0,0 +1,8 @@
+function MathJaxPolyfillInit(){
+  var typesetPromise = function() {
+    return new Promise(function (resolve, reject) {
+      MathJax.Hub.Queue(["Typeset",MathJax.Hub],[resolve]);
+    })
+  }
+  MathJax.typesetPromise=typesetPromise
+}
\ No newline at end of file