initial

themes/next/layout/_third-party/analytics/firestore.swig

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+{% if theme.firestore.enable %}
+  <script src="https://www.gstatic.com/firebasejs/4.6.0/firebase.js"></script>
+  <script src="https://www.gstatic.com/firebasejs/4.6.0/firebase-firestore.js"></script>
+  {% if theme.firestore.bluebird %}
+    <script src="https://cdnjs.cloudflare.com/ajax/libs/bluebird/3.5.1/bluebird.core.min.js"></script>
+  {% endif %}
+  <script>
+    (function () {
+
+      firebase.initializeApp({
+        apiKey: '{{ theme.firestore.apiKey }}',
+        projectId: '{{ theme.firestore.projectId }}'
+      })
+
+      function getCount(doc, increaseCount) {
+        //increaseCount will be false when not in article page
+
+        return doc.get().then(function (d) {
+          var count
+          if (!d.exists) { //has no data, initialize count
+            if (increaseCount) {
+              doc.set({
+                count: 1
+              })
+              count = 1
+            }
+            else {
+              count = 0
+            }
+          }
+          else { //has data
+            count = d.data().count
+            if (increaseCount) {
+              if (!(window.localStorage && window.localStorage.getItem(title))) { //if first view this article
+                doc.set({ //increase count
+                  count: count + 1
+                })
+                count++
+              }
+            }
+          }
+          if (window.localStorage && increaseCount) { //mark as visited
+            localStorage.setItem(title, true)
+          }
+
+          return count
+        })
+      }
+
+      function appendCountTo(el) {
+        return function (count) {
+          $(el).append(
+            $('<span>').addClass('post-visitors-count').append(
+              $('<span>').addClass('post-meta-divider').text('|')
+            ).append(
+              $('<span>').addClass('post-meta-item-icon').append(
+                $('<i>').addClass('fa fa-users')
+              )
+              ).append($('<span>').text('{{ __("post.views")}} ' + count))
+          )
+        }
+      }
+
+      var db = firebase.firestore()
+      var articles = db.collection('{{ theme.firestore.collection }}')
+
+      //https://hexo.io/docs/variables.html
+      var isPost = '{{ page.title }}'.length > 0
+      var isArchive = '{{ page.archive }}' === 'true'
+      var isCategory = '{{ page.category }}'.length > 0
+      var isTag = '{{ page.tag }}'.length > 0
+
+      if (isPost) { //is article page
+        var title = '{{ page.title }}'
+        var doc = articles.doc(title)
+
+        getCount(doc, true).then(appendCountTo($('.post-meta')))
+      }
+      else if (!isArchive && !isCategory && !isTag) { //is index page
+        var titles = [] //array to titles
+
+        var postsstr = '{% for post in page.posts %}titles.push("{{ post.title }}");{% endfor %}' //if you have a better way to get titles of posts, please change it
+        eval(postsstr)
+
+        var promises = titles.map(function (title) {
+          return articles.doc(title)
+        }).map(function (doc) {
+          return getCount(doc)
+        })
+        Promise.all(promises).then(function (counts) {
+          var metas = $('.post-meta')
+          counts.forEach(function (val, idx) {
+            appendCountTo(metas[idx])(val)
+          })
+        })
+      }
+    })()
+  </script>
+{% endif %}