add goldmark-mathjax extension

go.mod

@@ -129,6 +129,7 @@ require (
 	github.com/josharian/intern v1.0.0 // indirect
 	github.com/kr/pretty v0.3.1 // indirect
 	github.com/kr/text v0.2.0 // indirect
+	github.com/litao91/goldmark-mathjax v0.0.0-20210217064022-a43cf739a50f // indirect
 	github.com/mailru/easyjson v0.7.7 // indirect
 	github.com/mattn/go-colorable v0.1.13 // indirect
 	github.com/mattn/go-runewidth v0.0.9 // indirect

go.sum

@@ -355,6 +355,8 @@ github.com/kylelemons/godebug v1.1.0 h1:RPNrshWIDI6G2gRW9EHilWtl7Z6Sb1BR0xunSBf0
 github.com/kylelemons/godebug v1.1.0/go.mod h1:9/0rRGxNHcop5bhtWyNeEfOS8JIWk580+fNqagV/RAw=
 github.com/kyokomi/emoji/v2 v2.2.12 h1:sSVA5nH9ebR3Zji1o31wu3yOwD1zKXQA2z0zUyeit60=
 github.com/kyokomi/emoji/v2 v2.2.12/go.mod h1:JUcn42DTdsXJo1SWanHh4HKDEyPaR5CqkmoirZZP9qE=
+github.com/litao91/goldmark-mathjax v0.0.0-20210217064022-a43cf739a50f h1:plCPYXRXDCO57qjqegCzaVf1t6aSbgCMD+zfz18POfs=
+github.com/litao91/goldmark-mathjax v0.0.0-20210217064022-a43cf739a50f/go.mod h1:leg+HM7jUS84JYuY120zmU68R6+UeU6uZ/KAW7cViKE=
 github.com/magefile/mage v1.15.0 h1:BvGheCMAsG3bWUDbZ8AyXXpCNwU9u5CB6sM+HNb9HYg=
 github.com/magefile/mage v1.15.0/go.mod h1:z5UZb/iS3GoOSn0JgWuiw7dxlurVYTu+/jHXqQg881A=
 github.com/mailru/easyjson v0.0.0-20190614124828-94de47d64c63/go.mod h1:C1wdFJiN94OJF2b5HbByQZoLdCWB1Yqtg26g4irojpc=

markup/goldmark/convert.go

@@ -34,6 +34,8 @@ import (
 	"github.com/yuin/goldmark/renderer"
 	"github.com/yuin/goldmark/renderer/html"
 	"github.com/yuin/goldmark/text"
+
+	"github.com/litao91/goldmark-mathjax"
 )
 
 const (
@@ -100,6 +102,7 @@ func newMarkdown(pcfg converter.ProviderConfig) goldmark.Markdown {
 	)
 
 	extensions = append(extensions, images.New(cfg.Parser.WrapStandAloneImageWithinParagraph))
+	extensions = append(extensions, mathjax.MathJax)
 
 	if mcfg.Highlight.CodeFences {
 		extensions = append(extensions, codeblocks.New())