feat: add disqus plugin, closed #123

Author: QingWei-Li

build/build.js

@@ -48,7 +48,8 @@ var plugins = [
   { name: 'external-script', entry: 'external-script.js' },
   { name: 'front-matter', entry: 'front-matter/index.js' },
   { name: 'zoom-image', entry: 'zoom-image.js' },
-  { name: 'codesponsor', entry: 'codesponsor.js' }
+  { name: 'codesponsor', entry: 'codesponsor.js' },
+  { name: 'disqus', entry: 'disqus.js' }
 ]
 
 plugins.forEach(item => {

docs/plugins.md

@@ -147,3 +147,17 @@ window.$docsify = {
 ```
 
 See [here](https://github.com/jperasmus/docsify-copy-code/blob/master/README.md) for more details.
+
+
+## Disqus
+
+Disqus comments. https://disqus.com/
+
+```html
+<script>
+  window.$docsify = {
+    disqus: 'shortname'
+  }
+</script>
+<script src="//unpkg.com/docsify/lib/plugins/disqus.min.js"></script>
+```

src/plugins/disqus.js

@@ -0,0 +1,47 @@
+location.href = location.href.replace('/-/', '/#/')
+
+function install (hook, vm) {
+  const dom = Docsify.dom
+  const disqus = vm.config.disqus
+  if (!disqus) {
+    throw Error('$docsify.disqus is required')
+  }
+
+  hook.init(_ => {
+    const script = dom.create('script')
+
+    script.async = true
+    script.src = `https://${disqus}.disqus.com/embed.js`
+    script.setAttribute('data-timestamp', +new Date())
+    dom.appendTo(dom.body, script)
+  })
+
+  hook.mounted(_ => {
+    const div = dom.create('div')
+    div.id = 'disqus_thread'
+    const main = dom.getNode('#main')
+    div.style = `width: ${main.clientWidth}px; margin: 0 auto 20px;`
+    dom.appendTo(dom.find('.content'), div)
+
+    window.disqus_config = function () {
+      this.page.url = location.origin + '/-' + vm.route.path
+      this.page.identifier = vm.route.path
+      this.page.title = document.title
+    }
+  })
+
+  hook.doneEach(_ => {
+    if (typeof window.DISQUS !== 'undefined') {
+      DISQUS.reset({
+        reload: true,
+        config: function () {
+          this.page.url = location.origin + '/-' + vm.route.path
+          this.page.identifier = vm.route.path
+          this.page.title = document.title
+        }
+      })
+    }
+  })
+}
+
+$docsify.plugins = [].concat(install, $docsify.plugins)