Fix info add latex

Author: dark-flames

package-lock.json

@@ -1,6 +1,8 @@
 import 'highlight.js/styles/tomorrow.css'
+import 'katex/dist/katex.css'
 import Highlight from './Highlight'
 import escapeHtml from 'escape-html'
+import katex from 'katex/dist/katex'
 
 export function MarkdownParser (code, stringMap) {
     const marked = require('marked')
@@ -20,6 +22,16 @@ export function MarkdownParser (code, stringMap) {
             code = code.replace(mapItem.hash, mapItem.segment)
         })
 
+        if (lang === 'latex') {
+            try {
+                return katex.renderToString(code, {
+                    displayMode: true
+                })
+            } catch (exception) {
+                return code
+            }
+        }
+
         const out = highlight(code, lang)
         if (out !== null) {
             code = out

src/components/plugin/MarkdownParser.js

@@ -40,6 +40,10 @@ export default {
                                 title: 'php',
                                 value: 'php'
                             },
+                            {
+                                title: 'latex',
+                                value: 'latex'
+                            },
                             {
                                 title: '未选择',
                                 value: ''

src/components/toolbar-button/btn-code.js

@@ -5,6 +5,7 @@ export default {
     action: {
         insert () {
             window.location.href = 'https://github.com/luogu-dev/markdown-palettes'
+            return ''
         }
     }
 }