customize sidebar and navbar via markdown file, #6 (#8)

* Refactor: use iife

* Feat: customize sidebar and navbar via markdown file, #6

* Add changelog

src/tpl.js

@@ -0,0 +1,51 @@
+
+/**
+ * Render github corner
+ * @param  {Object} data
+ * @return {String}
+ */
+export function corner (data) {
+  if (!data) return ''
+  if (!/\/\//.test(data)) data = 'https://github.com/' + data
+
+  return `
+  <a href="${data}" class="github-corner" aria-label="View source on Github">
+    <svg viewBox="0 0 250 250" aria-hidden="true">
+      <path d="M0,0 L115,115 L130,115 L142,142 L250,250 L250,0 Z"></path>
+      <path d="M128.3,109.0 C113.8,99.7 119.0,89.6 119.0,89.6 C122.0,82.7 120.5,78.6 120.5,78.6 C119.2,72.0 123.4,76.3 123.4,76.3 C127.3,80.9 125.5,87.3 125.5,87.3 C122.9,97.6 130.6,101.9 134.4,103.2" fill="currentColor" style="transform-origin: 130px 106px;" class="octo-arm"></path>
+      <path d="M115.0,115.0 C114.9,115.1 118.7,116.5 119.8,115.4 L133.7,101.6 C136.9,99.2 139.9,98.4 142.2,98.6 C133.8,88.0 127.5,74.4 143.8,58.0 C148.5,53.4 154.0,51.2 159.7,51.0 C160.3,49.4 163.2,43.6 171.4,40.1 C171.4,40.1 176.1,42.5 178.8,56.2 C183.1,58.6 187.2,61.8 190.9,65.4 C194.5,69.0 197.7,73.2 200.1,77.6 C213.8,80.2 216.3,84.9 216.3,84.9 C212.7,93.1 206.9,96.0 205.4,96.6 C205.1,102.4 203.0,107.8 198.3,112.5 C181.9,128.9 168.3,122.5 157.7,114.1 C157.9,116.9 156.7,120.9 152.7,124.9 L141.0,136.5 C139.8,137.7 141.6,141.9 141.8,141.8 Z" fill="currentColor" class="octo-body"></path>
+    </svg>
+  </a>`
+}
+
+/**
+ * Render main content
+ * @return {[type]}      [description]
+ */
+export function main () {
+  return `<main>
+    <aside class="sidebar"></aside>
+    <section class="content">
+      <article class="markdown-section"></article>
+    </section>
+  </main>`
+}
+
+/**
+ * Render tree
+ * @param  {Array} tree
+ * @param  {String} tpl
+ * @return {String}
+ */
+export function tree (toc, tpl = '') {
+  if (!toc || !toc.length) return ''
+
+  toc.forEach(node => {
+    tpl += `<li><a class="section-link" href="${node.slug}">${node.title}</a></li>`
+    if (node.children) {
+      tpl += `<li><ul class="children">${tree(node.children)}</li></ul>`
+    }
+  })
+
+  return tpl
+}