feat: markdown anchors

client/themes/default/scss/app.scss

@@ -3,6 +3,26 @@
 .contents {
   color: mc('grey', '800');
 
+  h1, h2, h3, h4, h5, h6 {
+    position: relative;
+
+    &:hover {
+      .toc-anchor {
+        display: block;
+      }
+    }
+
+    .toc-anchor {
+      display: none;
+      position: absolute;
+      right: 1rem;
+      bottom: .5rem;
+      font-size: 1.25rem;
+      text-decoration: none;
+      color: mc('grey', '500');
+    }
+  }
+
   h1 {
     padding-left: 24px;
     color: mc('blue', '800');

package.json

@@ -147,6 +147,7 @@
     "semver": "5.5.1",
     "serve-favicon": "2.5.0",
     "sqlite3": "4.0.2",
+    "uslug": "1.0.4",
     "uuid": "3.3.2",
     "validator": "10.7.1",
     "validator-as-promised": "1.0.2",

server/modules/rendering/markdown-core/renderer.js

@@ -1,5 +1,7 @@
 const md = require('markdown-it')
+const mdAnchor = require('markdown-it-anchor')
 const _ = require('lodash')
+const uslug = require('uslug')
 
 const quoteStyles = {
   Chinese: '””‘’',
@@ -29,6 +31,14 @@ module.exports = {
       }
     })
 
+    mkdown.use(mdAnchor, {
+      slugify: s => uslug(s),
+      permalink: true,
+      permalinkClass: 'toc-anchor',
+      permalinkSymbol: '¶',
+      permalinkBefore: true
+    })
+
     for (let child of this.children) {
       const renderer = require(`../${_.kebabCase(child.key)}/renderer.js`)
       renderer.init(mkdown, child.config)

yarn.lock

@@ -12085,6 +12085,10 @@ universalify@^0.1.0:
   version "0.1.1"
   resolved "https://registry.yarnpkg.com/universalify/-/universalify-0.1.1.tgz#fa71badd4437af4c148841e3b3b165f9e9e590b7"
 
+"unorm@>= 1.0.0":
+  version "1.4.1"
+  resolved "https://registry.yarnpkg.com/unorm/-/unorm-1.4.1.tgz#364200d5f13646ca8bcd44490271335614792300"
+
 unpipe@1.0.0, unpipe@~1.0.0:
   version "1.0.0"
   resolved "https://registry.yarnpkg.com/unpipe/-/unpipe-1.0.0.tgz#b2bf4ee8514aae6165b4817829d21b2ef49904ec"
@@ -12172,6 +12176,12 @@ use@^3.1.0:
   dependencies:
     kind-of "^6.0.2"
 
+uslug@1.0.4:
+  version "1.0.4"
+  resolved "https://registry.yarnpkg.com/uslug/-/uslug-1.0.4.tgz#b9a22f0914e0a86140633dacc302e5f4fa450677"
+  dependencies:
+    unorm ">= 1.0.0"
+
 util-deprecate@~1.0.1:
   version "1.0.2"
   resolved "https://registry.yarnpkg.com/util-deprecate/-/util-deprecate-1.0.2.tgz#450d4dc9fa70de732762fbd2d4a28981419a0ccf"