From b2d532ea28eaaf0b7b2cf225c713c8a8d3f4a3bf Mon Sep 17 00:00:00 2001
From: Benjamin Tan <demoneaux@gmail.com>
Date: Thu, 8 Feb 2018 20:54:21 +0800
Subject: Allow users to customise MathJax options.

Ref. #1856, #2006, #2045.

This is a more open approach to allow customisation of all MathJax options instead of select options only.
---
 plugin/math/math.js | 39 ++++++++++++++++++++++++++++-----------
 1 file changed, 28 insertions(+), 11 deletions(-)

(limited to 'plugin')

diff --git a/plugin/math/math.js b/plugin/math/math.js
index 7867376..29445cd 100755
--- a/plugin/math/math.js
+++ b/plugin/math/math.js
@@ -7,19 +7,26 @@
 var RevealMath = window.RevealMath || (function(){
 
 	var options = Reveal.getConfig().math || {};
-	options.mathjax = options.mathjax || 'https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.0/MathJax.js';
-	options.config = options.config || 'TeX-AMS_HTML-full';
-	options.tex2jax = options.tex2jax || {
-				inlineMath: [['$','$'],['\\(','\\)']] ,
-				skipTags: ['script','noscript','style','textarea','pre'] };
+	var mathjax = options.mathjax || 'https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.0/MathJax.js';
+	var config = options.config || 'TeX-AMS_HTML-full';
+	var url = mathjax + '?config=' + config;
 
-	loadScript( options.mathjax + '?config=' + options.config, function() {
+	var defaultOptions = {
+		messageStyle: 'none',
+		tex2jax: {
+			inlineMath: [ [ '$', '$' ], [ '\\(', '\\)' ] ],
+			skipTags: [ 'script', 'noscript', 'style', 'textarea', 'pre' ]
+		},
+		skipStartupTypeset: true
+	};
 
-		MathJax.Hub.Config({
-			messageStyle: 'none',
-			tex2jax: options.tex2jax,
-			skipStartupTypeset: true
-		});
+	defaults( options, defaultOptions );
+	defaults( options.tex2jax, defaultOptions.tex2jax );
+	options.mathjax = options.config = null;
+
+	loadScript( url, function() {
+
+		MathJax.Hub.Config( options );
 
 		// Typeset followed by an immediate reveal.js layout since
 		// the typesetting process could affect slide height
@@ -35,6 +42,16 @@ var RevealMath = window.RevealMath || (function(){
 
 	} );
 
+	function defaults( options, defaultOptions ) {
+
+		for ( var i in defaultOptions ) {
+			if ( !options.hasOwnProperty( i ) ) {
+				options[i] = defaultOptions[i];
+			}
+		}
+
+	}
+
 	function loadScript( url, callback ) {
 
 		var head = document.querySelector( 'head' );
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