KaTeX fixes:

* In Options.HTMLMathMethod, the KaTeX contsructor now takes only
  one string (for the KaTeX base URL), rather than two [API change].
* The default URL has been updated to the latest version.
* The autoload script is now loaded by default.

5 files changed, 22 insertions, 44 deletions

diff --git a/MANUAL.txt b/MANUAL.txt
index d3364ca26..ebf235896 100644
--- a/MANUAL.txt
+++ b/MANUAL.txt
@@ -1116,7 +1116,7 @@ Math rendering in HTML
 `--katex`[`=`*URL*]
 
 :   Use [KaTeX] to display embedded TeX math in HTML output.
-    The *URL* should point to the `katex.js` load script. If a *URL* is
+    The *URL* is the base URL for the KaTeX library. If a *URL* is
     not provided, a link to the KaTeX CDN will be inserted.
     Note: [KaTeX] seems to work best with `html5` output.
 
diff --git a/src/Text/Pandoc/App.hs b/src/Text/Pandoc/App.hs
index 57a91581b..a18cc2961 100644
--- a/src/Text/Pandoc/App.hs
+++ b/src/Text/Pandoc/App.hs
@@ -183,13 +183,6 @@ convertWithOpts opts = do
                          Nothing -> return Nothing
                          Just fp -> Just <$> UTF8.readFile fp
 
-  let mathMethod =
-        case (optKaTeXJS opts, optKaTeXStylesheet opts) of
-            (Nothing, _)  -> optHTMLMathMethod opts
-            (Just js, ss) -> KaTeX js (fromMaybe
-                               (defaultKaTeXURL ++ "katex.min.css") ss)
-
-
   -- --bibliography implies -F pandoc-citeproc for backwards compatibility:
   let needsCiteproc = isJust (lookup "bibliography" (optMetadata opts)) &&
                       optCiteMethod opts `notElem` [Natbib, Biblatex] &&
@@ -368,7 +361,7 @@ convertWithOpts opts = do
         maybe return (addStringAsVariable "epub-cover-image")
                      (optEpubCoverImage opts)
         >>=
-        (\vars -> case mathMethod of
+        (\vars -> case optHTMLMathMethod opts of
                        LaTeXMathML Nothing -> do
                           s <- UTF8.toString <$> readDataFile "LaTeXMathML.js"
                           return $ ("mathml-script", s) : vars
@@ -428,7 +421,7 @@ convertWithOpts opts = do
           , writerVariables        = variables
           , writerTabStop          = optTabStop opts
           , writerTableOfContents  = optTableOfContents opts
-          , writerHTMLMathMethod   = mathMethod
+          , writerHTMLMathMethod   = optHTMLMathMethod opts
           , writerIncremental      = optIncremental opts
           , writerCiteMethod       = optCiteMethod opts
           , writerNumberSections   = optNumberSections opts
@@ -642,8 +635,6 @@ data Opt = Opt
     , optExtractMedia          :: Maybe FilePath -- ^ Path to extract embedded media
     , optTrackChanges          :: TrackChanges -- ^ Accept or reject MS Word track-changes.
     , optFileScope             :: Bool         -- ^ Parse input files before combining
-    , optKaTeXStylesheet       :: Maybe String     -- ^ Path to stylesheet for KaTeX
-    , optKaTeXJS               :: Maybe String     -- ^ Path to js file for KaTeX
     , optTitlePrefix           :: Maybe String     -- ^ Prefix for title
     , optCss                   :: [FilePath]       -- ^ CSS files to link to
     , optIncludeBeforeBody     :: [FilePath]       -- ^ Files to include before
@@ -719,8 +710,6 @@ defaultOpts = Opt
     , optExtractMedia          = Nothing
     , optTrackChanges          = AcceptChanges
     , optFileScope             = False
-    , optKaTeXStylesheet       = Nothing
-    , optKaTeXJS               = Nothing
     , optTitlePrefix           = Nothing
     , optCss                   = []
     , optIncludeBeforeBody     = []
@@ -1455,18 +1444,11 @@ options =
                  (OptArg
                   (\arg opt ->
                       return opt
-                        { optKaTeXJS =
-                           arg <|> Just (defaultKaTeXURL ++ "katex.min.js")})
+                        { optHTMLMathMethod = KaTeX $
+                           fromMaybe defaultKaTeXURL arg })
                   "URL")
                   "" -- Use KaTeX for HTML Math
 
-    , Option "" ["katex-stylesheet"]
-                 (ReqArg
-                  (\arg opt ->
-                      return opt { optKaTeXStylesheet = Just arg })
-                 "URL")
-                 "" -- Set the KaTeX Stylesheet location
-
     , Option "" ["gladtex"]
                  (NoArg
                   (\opt -> return opt { optHTMLMathMethod = GladTeX }))
diff --git a/src/Text/Pandoc/Options.hs b/src/Text/Pandoc/Options.hs
index f936658f4..99c7afba7 100644
--- a/src/Text/Pandoc/Options.hs
+++ b/src/Text/Pandoc/Options.hs
@@ -107,7 +107,7 @@ data HTMLMathMethod = PlainMath
                     | WebTeX String               -- url of TeX->image script.
                     | MathML
                     | MathJax String              -- url of MathJax.js
-                    | KaTeX String String -- url of stylesheet and katex.js
+                    | KaTeX String                -- url of KaTeX files
                     deriving (Show, Read, Eq, Data, Typeable, Generic)
 
 instance ToJSON HTMLMathMethod where
diff --git a/src/Text/Pandoc/Writers/HTML.hs b/src/Text/Pandoc/Writers/HTML.hs
index 1641b991c..41b50bf70 100644
--- a/src/Text/Pandoc/Writers/HTML.hs
+++ b/src/Text/Pandoc/Writers/HTML.hs
@@ -268,10 +268,17 @@ pandocToHtml opts (Pandoc meta blocks) = do
                          H.script ! A.src (toValue url)
                                   ! A.type_ "text/javascript"
                                   $ mempty
-                      KaTeX js css ->
-                         (H.script ! A.src (toValue js) $ mempty) <>
-                         (H.link ! A.rel "stylesheet" ! A.href (toValue css)) <>
-                         (H.script ! A.type_ "text/javascript" $ toHtml renderKaTeX)
+                      KaTeX url ->
+                         (H.script !
+                           A.src (toValue $ url ++ "katex.min.js") $ mempty) <>
+                         (H.script !
+                           A.src (toValue $ url ++ "contrib/auto-render.min.js")
+                             $ mempty) <>
+                         (H.script $
+                            "document.addEventListener(\"DOMContentLoaded\", function() {\n  renderMathInElement(document.body);\n});") <>
+                         (H.link ! A.rel "stylesheet" !
+                           A.href (toValue $ url ++ "katex.min.css"))
+
                       _ -> case lookup "mathml-script" (writerVariables opts) of
                                  Just s | not (stHtml5 st) ->
                                    H.script ! A.type_ "text/javascript"
@@ -1009,10 +1016,10 @@ inlineToHtml opts inline = do
               case t of
                 InlineMath  -> "\\(" ++ str ++ "\\)"
                 DisplayMath -> "\\[" ++ str ++ "\\]"
-           KaTeX _ _ -> return $ H.span ! A.class_ mathClass $
-              toHtml (case t of
-                        InlineMath  -> str
-                        DisplayMath -> "\\displaystyle " ++ str)
+           KaTeX _ -> return $ H.span ! A.class_ mathClass $ toHtml $
+              case t of
+                InlineMath  -> "\\(" ++ str ++ "\\)"
+                DisplayMath -> "\\[" ++ str ++ "\\]"
            PlainMath -> do
               x <- lift (texMathToInlines t str) >>= inlineListToHtml opts
               let m = H.span ! A.class_ mathClass $ x
@@ -1133,17 +1140,6 @@ blockListToNote opts ref blocks =
                               _          -> noteItem
          return $ nl opts >> noteItem'
 
--- Javascript snippet to render all KaTeX elements
-renderKaTeX :: String
-renderKaTeX = unlines [
-    "window.onload = function(){var mathElements = document.getElementsByClassName(\"math\");"
-  , "for (var i=0; i < mathElements.length; i++)"
-  , "{"
-  , " var texText = mathElements[i].firstChild"
-  , " katex.render(texText.data, mathElements[i])"
-  , "}}"
-  ]
-
 isMathEnvironment :: String -> Bool
 isMathEnvironment s = "\\begin{" `isPrefixOf` s &&
                          envName `elem` mathmlenvs
diff --git a/src/Text/Pandoc/Writers/Math.hs b/src/Text/Pandoc/Writers/Math.hs
index 58252d60f..1677cb5b6 100644
--- a/src/Text/Pandoc/Writers/Math.hs
+++ b/src/Text/Pandoc/Writers/Math.hs
@@ -53,4 +53,4 @@ defaultMathJaxURL :: String
 defaultMathJaxURL = "https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.0/"
 
 defaultKaTeXURL :: String
-defaultKaTeXURL = "https://cdnjs.cloudflare.com/ajax/libs/KaTeX/0.6.0/"
+defaultKaTeXURL = "https://cdnjs.cloudflare.com/ajax/libs/KaTeX/0.8.3/"