provide plugin for matomo

docs/index.html

@@ -44,6 +44,10 @@
       maxLevel: 4,
       subMaxLevel: 2,
       ga: 'UA-106147152-1',
+      matomo: {
+        host: '//matomo.thunderwave.de',
+        id: 6
+      },
       name: 'docsify',
       search: {
         noData: {
@@ -84,6 +88,7 @@
   <script src="//unpkg.com/docsify/lib/docsify.min.js"></script>
   <script src="//unpkg.com/docsify/lib/plugins/search.min.js"></script>
   <script src="//unpkg.com/docsify/lib/plugins/ga.min.js"></script>
+  <script src="//unpkg.com/docsify/lib/plugins/matomo.min.js"></script>
   <script src="//unpkg.com/prismjs/components/prism-bash.min.js"></script>
   <script src="//unpkg.com/prismjs/components/prism-markdown.min.js"></script>
   <script src="//unpkg.com/prismjs/components/prism-nginx.min.js"></script>

src/plugins/matomo.js

@@ -0,0 +1,37 @@
+function appendScript(options) {
+  const script = document.createElement('script')
+  script.async = true
+  script.src = options.host + '/matomo.js'
+  document.body.appendChild(script)
+}
+
+function init(options) {
+  window._paq = window._paq || []
+  window._paq.push(['trackPageView'])
+  window._paq.push(['enableLinkTracking'])
+  setTimeout(function() {
+    appendScript(options)
+    window._paq.push(['setTrackerUrl', options.host + '/matomo.php'])
+    window._paq.push(['setSiteId', options.id + ''])
+  }, 0)
+}
+
+function collect() {
+  if (!window._paq) {
+    init($docsify.matomo)
+  }
+  window._paq.push(['setCustomUrl',  window.location.hash.substr(1)])
+  window._paq.push(['setDocumentTitle', document.title])
+  window._paq.push(['trackPageView'])
+}
+
+const install = function (hook) {
+  if (!$docsify.matomo) {
+    console.error('[Docsify] matomo is required.')
+    return
+  }
+
+  hook.beforeEach(collect)
+}
+
+$docsify.plugins = [].concat(install, $docsify.plugins)