Add markdown preview, update rust.vim

sources_non_forked/markdown-preview.nvim/app/pages/flowchart.js

@@ -0,0 +1,39 @@
+let options = {}
+
+const flowchart = (md, opts = {}) => {
+  options = opts
+  const temp = md.renderer.rules.fence.bind(md.renderer.rules)
+  md.renderer.rules.fence = (tokens, idx, options, env, slf) => {
+    const token = tokens[idx]
+    try {
+      if (token.info && token.info.trim() === 'flowchart') {
+        const code = token.content.trim()
+        return `<div class="flowchart">${code}</div>`
+      }
+    } catch (e) {
+      console.error(`Parse flowchart Error: `, e)
+    }
+    return temp(tokens, idx, options, env, slf)
+  }
+}
+
+export const renderFlowchart = () => {
+  let list = document.querySelectorAll('div.flowchart')
+  if (!list) {
+    return
+  }
+  list.forEach(item => {
+    try {
+      let d = window.flowchart.parse(item.textContent);
+      item.className = ''
+      item.textContent = ''
+      d.drawSVG(item, options);
+      d = null
+    } catch (e) {
+      console.error(`Parse flowchart Error: ${e}`)
+    }
+  })
+  list = null
+}
+
+export default flowchart