Works

Former-commit-id: 512f2d3da4804173fe57742e0a50105b6daa9b6a [formerly cb018be7957dea25f4e5636a6c86f6344bb21223] [formerly 8e9ef6e466dc6ea6c300583a944a2223721c08cc [formerly 63982d402d]]
Former-commit-id: 1491644778252a8edc2a7056d9cfb997d412cd8d [formerly 808628c9d571e2960fce0e5064d237c23336d9df]
Former-commit-id: d54ab5932876063015895ed2a57f9e598ac7d27b

routes.go

@@ -4,6 +4,7 @@ import (
 	"html/template"
 	"io/ioutil"
 	"net/http"
+	"regexp"
 	"strconv"
 	"strings"
 
@@ -62,9 +63,16 @@ func renderMarkdown(c *gin.Context, title string) {
 	}
 	unsafe := blackfriday.MarkdownCommon([]byte(p.Text))
 	html := bluemonday.UGCPolicy().SanitizeBytes(unsafe)
+	html2 := string(html)
+
+	r, _ := regexp.Compile("\\$(.*?)\\$")
+	for _, s := range r.FindAllString(html2, -1) {
+		html2 = strings.Replace(html2, s, "<div class='tex' data-expr='"+s[1:len(s)-1]+"'></div>", 1)
+	}
+
 	c.HTML(http.StatusOK, "view.tmpl", gin.H{
 		"Title": title,
-		"Body":  template.HTML(html),
+		"Body":  template.HTML([]byte(html2)),
 	})
 }
 

templates/view.tmpl

@@ -7,7 +7,8 @@
   {{ template "header" }}
 
   <link rel="stylesheet" type="text/css" href="/static/css/view.css">
-
+  <link rel="stylesheet" type="text/css" href="/static/css/katex.min.css">
+<script src="/static/js/katex.min.js"></script>
 
 
 </head>
@@ -42,6 +43,17 @@
   </div>
 
 
+<script>
+$( document ).ready(function() {
+  var tex = document.getElementsByClassName("tex");
+  Array.prototype.forEach.call(tex, function(el) {
+      katex.render(el.getAttribute("data-expr"), el);
+  });
+
+});
+
+
+</script>
 </body>
 
 </html>