Replace SmartyPants plugin with custom

shared/naturalcrit/markdown.js

@@ -2,8 +2,7 @@
 const _ = require('lodash');
 const Marked = require('marked');
 const MarkedExtendedTables = require('marked-extended-tables');
-const {gfmHeadingId: MarkedGFMHeadingId} = require('marked-gfm-heading-id');
-const {markedSmartypants: MarkedSmartyPants} = require('marked-smartypants');
+const { gfmHeadingId: MarkedGFMHeadingId } = require('marked-gfm-heading-id');
 const renderer = new Marked.Renderer();
 
 //Processes the markdown within an HTML block if it's just a class-wrapper
@@ -238,10 +237,49 @@ const definitionLists = {
 	}
 };
 
+const MarkedSmartyPantsLite = ()=>{
+	return {
+		tokenizer : {
+			inlineText(src) {
+				// don't escape inlineText
+				const cap = this.rules.inline.text.exec(src);
+
+				/* istanbul ignore next */
+				if(!cap) {
+					// should never happen
+					return;
+				}
+
+				const text = cap[0]
+					// em-dashes
+					.replace(/---/g, '\u2014')
+					// en-dashes
+					.replace(/--/g, '\u2013')
+					// opening singles
+					.replace(/(^|[-\u2014/(\[{"\s])'/g, '$1\u2018')
+					// closing singles & apostrophes
+					.replace(/'/g, '\u2019')
+					// opening doubles
+					.replace(/(^|[-\u2014/(\[{\u2018\s])"/g, '$1\u201c')
+					// closing doubles
+					.replace(/"/g, '\u201d')
+					// ellipses
+					.replace(/\.{3}/g, '\u2026');
+
+				return {
+					type : 'text',
+					raw  : cap[0],
+					text : text
+				};
+			}
+		}
+	};
+};
+
 Marked.use({ extensions: [mustacheSpans, mustacheDivs, mustacheInjectInline, definitionLists] });
 Marked.use(mustacheInjectBlock);
-Marked.use({ renderer: renderer, smartypants: true, mangle: false, smartypants: false });
-Marked.use(MarkedExtendedTables(), MarkedGFMHeadingId(), MarkedSmartyPants());
+Marked.use({ renderer: renderer, mangle: false });
+Marked.use(MarkedExtendedTables(), MarkedGFMHeadingId(), MarkedSmartyPantsLite());
 
 //Fix local links in the Preview iFrame to link inside the frame
 renderer.link = function (href, title, text) {