refactor(core): adjust directory structure:

src/core/render/dom.js

@@ -0,0 +1,12 @@
+const cacheNode = {}
+
+export function getCacheNode (el) {
+  if (typeof el === 'string') {
+    const selector = el
+
+    el = cacheNode[el] || document.querySelector(el)
+    if (!el) console.error('Cannot find element:', selector)
+  }
+
+  return el
+}

src/core/render/index.js

@@ -0,0 +1,9 @@
+export function renderMixin (Docsify) {
+  Docsify.prototype._renderTo = function (dom, content) {
+
+  }
+}
+
+export function initRender (vm) {
+  // init
+}

src/core/render/progressbar.js

@@ -0,0 +1,45 @@
+import { isPrimitive } from '../util/core'
+
+let loadingEl
+let timeId
+
+/**
+ * Init progress component
+ */
+function init () {
+  if (loadingEl) return
+  const div = document.createElement('div')
+
+  div.classList.add('progress')
+  document.body.appendChild(div)
+  loadingEl = div
+}
+/**
+ * Render progress bar
+ */
+export default function ({ loaded, total, step }) {
+  let num
+
+  loadingEl = init()
+
+  if (!isPrimitive(step)) {
+    step = Math.floor(Math.random() * 5 + 1)
+  }
+  if (step) {
+    num = parseInt(loadingEl.style.width, 10) + step
+    num = num > 80 ? 80 : num
+  } else {
+    num = Math.floor(loaded / total * 100)
+  }
+
+  loadingEl.style.opacity = 1
+  loadingEl.style.width = num >= 95 ? '100%' : num + '%'
+
+  if (num >= 95) {
+    clearTimeout(timeId)
+    timeId = setTimeout(_ => {
+      loadingEl.style.opacity = 0
+      loadingEl.style.width = '0%'
+    }, 200)
+  }
+}

src/core/render/tpl.js

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+import { isMobile } from '../util/core'
+/**
+ * Render github corner
+ * @param  {Object} data
+ * @return {String}
+ */
+export function corner (data) {
+  if (!data) return ''
+  if (!/\/\//.test(data)) data = 'https://github.com/' + data
+  data = data.replace(/^git\+/, '')
+
+  return `
+  <a href="${data}" class="github-corner" aria-label="View source on Github">
+    <svg viewBox="0 0 250 250" aria-hidden="true">
+      <path d="M0,0 L115,115 L130,115 L142,142 L250,250 L250,0 Z"></path>
+      <path d="M128.3,109.0 C113.8,99.7 119.0,89.6 119.0,89.6 C122.0,82.7 120.5,78.6 120.5,78.6 C119.2,72.0 123.4,76.3 123.4,76.3 C127.3,80.9 125.5,87.3 125.5,87.3 C122.9,97.6 130.6,101.9 134.4,103.2" fill="currentColor" style="transform-origin: 130px 106px;" class="octo-arm"></path>
+      <path d="M115.0,115.0 C114.9,115.1 118.7,116.5 119.8,115.4 L133.7,101.6 C136.9,99.2 139.9,98.4 142.2,98.6 C133.8,88.0 127.5,74.4 143.8,58.0 C148.5,53.4 154.0,51.2 159.7,51.0 C160.3,49.4 163.2,43.6 171.4,40.1 C171.4,40.1 176.1,42.5 178.8,56.2 C183.1,58.6 187.2,61.8 190.9,65.4 C194.5,69.0 197.7,73.2 200.1,77.6 C213.8,80.2 216.3,84.9 216.3,84.9 C212.7,93.1 206.9,96.0 205.4,96.6 C205.1,102.4 203.0,107.8 198.3,112.5 C181.9,128.9 168.3,122.5 157.7,114.1 C157.9,116.9 156.7,120.9 152.7,124.9 L141.0,136.5 C139.8,137.7 141.6,141.9 141.8,141.8 Z" fill="currentColor" class="octo-body"></path>
+    </svg>
+  </a>`
+}
+
+/**
+ * Render main content
+ */
+export function main () {
+  const aside = `${toggle()}<aside class="sidebar"><div class="sidebar-nav"></div></aside>`
+
+  return (isMobile() ? `${aside}<main>` : `<main>${aside}`) +
+    `<section class="content">
+      <article class="markdown-section"></article>
+    </section>
+    </main>`
+}
+
+/**
+ * Cover Page
+ */
+export function cover () {
+  const SL = ', 100%, 85%'
+  const bgc = `linear-gradient(to left bottom, hsl(${Math.floor(Math.random() * 255) + SL}) 0%, hsl(${Math.floor(Math.random() * 255) + SL}) 100%)`
+
+  return `<section class="cover" style="background: ${bgc}">
+    <div class="cover-main"></div>
+    <div class="mask"></div>
+  </section>`
+}
+
+export function toggle () {
+  return `<button class="sidebar-toggle">
+      <div class="sidebar-toggle-button">
+        <span></span><span></span><span></span>
+      </div>
+    </button>`
+}
+
+/**
+ * Render tree
+ * @param  {Array} tree
+ * @param  {String} tpl
+ * @return {String}
+ */
+export function tree (toc, tpl = '') {
+  if (!toc || !toc.length) return ''
+
+  toc.forEach(node => {
+    tpl += `<li><a class="section-link" href="${node.slug}">${node.title}</a></li>`
+    if (node.children) {
+      tpl += `<li><ul class="children">${tree(node.children)}</li></ul>`
+    }
+  })
+
+  return tpl
+}
+
+export function helper (className, content) {
+  return `<p class="${className}">${content.slice(5).trim()}</p>`
+}
+
+export function theme (color) {
+  return `<style>:root{--theme-color: ${color};}</style>`
+}