Add markdown preview, update rust.vim

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

@@ -0,0 +1,39 @@
+let options = {}
+
+const dot = (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() === 'dot' || token.info.trim() === 'graphviz')) {
+                const code = token.content.trim()
+                return `<div class="dot">${code}</div>`
+            }
+        } catch (e) {
+            console.error(`Parse flowchart Error: `, e)
+        }
+        return temp(tokens, idx, options, env, slf)
+    }
+}
+
+export const renderDot = () => {
+    let list = document.querySelectorAll('.dot')
+    if (!list) {
+        return
+    }
+    var viz = new Viz();
+    list.forEach(item => {
+        viz.renderSVGElement(item.textContent).then(function (e) {
+            item.textContent = ''
+            item.appendChild(e)
+        })
+            .catch(e => {
+                var viz = new Viz();
+                console.error(`Parse dot Error: ${e}`)
+            })
+    })
+    list = null
+}
+
+export default dot