feat: google analytics

Author: yyx990803

docs/config/README.md

@@ -18,6 +18,8 @@ sidebar: auto
 
 ### dest
 
+### ga
+
 ## Theming
 
 ### theme

docs/guide/README.md

@@ -29,10 +29,9 @@ Each markdown file is compiled into HTML with [markdown-it](https://github.com/m
 VuePress is still a work in progress. There are a few things that it currently does not support but are planned:
 
 - Dropdown Items in Navbar
-- Google Analytics Integration
-- Algolia DocSearch Integration
 - Multi-Language Support
 - PWA Support
+- Algolia DocSearch Integration
 - Blogging support
 
 Contributions are welcome!

lib/app/clientEntry.js

@@ -1,8 +1,34 @@
+/* global GA_ID, ga */
+
 import './.temp/polyfill'
 import { createApp } from './app'
 
 const { app, router } = createApp()
 
+// Google analytics integration
+if (process.env.NODE_ENV === 'production' && GA_ID) {
+  (function (i, s, o, g, r, a, m) {
+    i['GoogleAnalyticsObject'] = r
+    i[r] = i[r] || function () {
+      (i[r].q = i[r].q || []).push(arguments)
+    }
+    i[r].l = 1 * new Date()
+    a = s.createElement(o)
+    m = s.getElementsByTagName(o)[0]
+    a.async = 1
+    a.src = g
+    m.parentNode.insertBefore(a, m)
+  })(window, document, 'script', 'https://www.google-analytics.com/analytics.js', 'ga')
+
+  ga('create', GA_ID, 'auto')
+  ga('send', 'pageview')
+
+  router.afterEach(function (to) {
+    ga('set', 'page', to.fullPath)
+    ga('send', 'pageview')
+  })
+}
+
 router.onReady(() => {
   app.$mount('#app')
 })

lib/webpack/createBaseConfig.js

@@ -210,5 +210,12 @@ module.exports = function createBaseConfig ({
       })
   }
 
+  // inject Google analytics ID
+  config
+    .plugin('ga')
+    .use(require('webpack/lib/DefinePlugin'), [{
+      GA_ID: siteConfig.ga ? JSON.stringify(siteConfig.ga) : `false`
+    }])
+
   return config
 }