From f766348fd8ca2d619d9d4081d744a331eacdce02 Mon Sep 17 00:00:00 2001
From: John MacFarlane <jgm@berkeley.edu>
Date: Thu, 4 Oct 2018 10:04:49 -0700
Subject: [PATCH] KaTeX: don't use autorenderer.

We no longer surround formulas with `\(..\)` or `\[..\]` and
rely on the autorenderer. Instead, we tell katex to convert
the contents of span elements with class "math". Since math has
already been identified, this avoids wasted time parsing
for LaTeX delimiters.

Note, however, that this may yield unexpected results
if you have span elements with class "math" that
don't contain LaTeX math.

Also, use latest version of KaTeX by default (0.9.0).

Closes #4946.
---
 src/Text/Pandoc/Writers/HTML.hs | 10 +++++-----
 src/Text/Pandoc/Writers/Math.hs |  2 +-
 2 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/src/Text/Pandoc/Writers/HTML.hs b/src/Text/Pandoc/Writers/HTML.hs
index 19ec4692e..46f754226 100644
--- a/src/Text/Pandoc/Writers/HTML.hs
+++ b/src/Text/Pandoc/Writers/HTML.hs
@@ -277,10 +277,10 @@ pandocToHtml opts (Pandoc meta blocks) = do
                       KaTeX url -> do
                          H.script !
                            A.src (toValue $ url ++ "katex.min.js") $ mempty
-                         H.script !
-                           A.src (toValue $ url ++ "contrib/auto-render.min.js") $ mempty
+                         nl opts
                          H.script
-                            "document.addEventListener(\"DOMContentLoaded\", function() {\n  renderMathInElement(document.body);\n});"
+                            "document.addEventListener(\"DOMContentLoaded\", function () {\n  var mathElements = document.getElementsByClassName(\"math\");\n  for (var i = 0; i < mathElements.length; i++) {\n    var texText = mathElements[i].firstChild;\n    if (mathElements[i].tagName == \"SPAN\") { katex.render(texText.data, mathElements[i], { displayMode: mathElements[i].classList.contains(\"display\"), throwOnError: false } );\n  }}});"
+                         nl opts
                          H.link ! A.rel "stylesheet" !
                            A.href (toValue $ url ++ "katex.min.css")
 
@@ -1065,8 +1065,8 @@ inlineToHtml opts inline = do
                 DisplayMath -> "\\[" ++ str ++ "\\]"
            KaTeX _ -> return $ H.span ! A.class_ mathClass $ toHtml $
               case t of
-                InlineMath  -> "\\(" ++ str ++ "\\)"
-                DisplayMath -> "\\[" ++ str ++ "\\]"
+                InlineMath  -> str
+                DisplayMath -> str
            PlainMath -> do
               x <- lift (texMathToInlines t str) >>= inlineListToHtml opts
               let m = H.span ! A.class_ mathClass $ x
diff --git a/src/Text/Pandoc/Writers/Math.hs b/src/Text/Pandoc/Writers/Math.hs
index 99d17d594..61decf2df 100644
--- a/src/Text/Pandoc/Writers/Math.hs
+++ b/src/Text/Pandoc/Writers/Math.hs
@@ -55,4 +55,4 @@ defaultMathJaxURL :: String
 defaultMathJaxURL = "https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.2/"
 
 defaultKaTeXURL :: String
-defaultKaTeXURL = "https://cdnjs.cloudflare.com/ajax/libs/KaTeX/0.8.3/"
+defaultKaTeXURL = "https://cdnjs.cloudflare.com/ajax/libs/KaTeX/0.9.0/"