3 files changed, 113 insertions, 0 deletions
diff --git a/node_modules/vuepress/lib/app/root-mixins/activeHeaderLinks.js b/node_modules/vuepress/lib/app/root-mixins/activeHeaderLinks.js
new file mode 100644
index 00000000..6cad69d5
--- /dev/null
+++ b/node_modules/vuepress/lib/app/root-mixins/activeHeaderLinks.js
@@ -0,0 +1,47 @@
+import store from '@app/store'
+import throttle from 'lodash.throttle'
+
+export default {
+  mounted () {
+    window.addEventListener('scroll', this.onScroll)
+  },
+  methods: {
+    onScroll: throttle(function () {
+      this.setActiveHash()
+    }, 300),
+    setActiveHash () {
+      const sidebarLinks = [].slice.call(document.querySelectorAll('.sidebar-link'))
+      const anchors = [].slice.call(document.querySelectorAll('.header-anchor'))
+      .filter(anchor => sidebarLinks.some(sidebarLink => sidebarLink.hash === anchor.hash))
+
+      const scrollTop = Math.max(
+        window.pageYOffset,
+        document.documentElement.scrollTop,
+        document.body.scrollTop
+      )
+
+      for (let i = 0; i < anchors.length; i++) {
+        const anchor = anchors[i]
+        const nextAnchor = anchors[i + 1]
+
+        const isActive = i === 0 && scrollTop === 0 ||
+        (scrollTop >= anchor.parentElement.offsetTop + 10 &&
+        (!nextAnchor || scrollTop < nextAnchor.parentElement.offsetTop - 10))
+
+        if (isActive && decodeURIComponent(this.$route.hash) !== decodeURIComponent(anchor.hash)) {
+          store.disableScrollBehavior = true
+          this.$router.replace(decodeURIComponent(anchor.hash), () => {
+            // execute after scrollBehavior handler.
+            this.$nextTick(() => {
+              store.disableScrollBehavior = false
+            })
+          })
+          return
+        }
+      }
+    }
+  },
+  beforeDestroy () {
+    window.removeEventListener('scroll', this.onScroll)
+  }
+}
diff --git a/node_modules/vuepress/lib/app/root-mixins/index.js b/node_modules/vuepress/lib/app/root-mixins/index.js
new file mode 100644
index 00000000..fd966f39
--- /dev/null
+++ b/node_modules/vuepress/lib/app/root-mixins/index.js
@@ -0,0 +1,7 @@
+import updateMeta from './updateMeta'
+import activeHeaderLinks from '@activeHeaderLinks'
+
+export default [
+  updateMeta, // required
+  activeHeaderLinks // optional
+]
diff --git a/node_modules/vuepress/lib/app/root-mixins/updateMeta.js b/node_modules/vuepress/lib/app/root-mixins/updateMeta.js
new file mode 100644
index 00000000..ff2703ac
--- /dev/null
+++ b/node_modules/vuepress/lib/app/root-mixins/updateMeta.js
@@ -0,0 +1,59 @@
+export default {
+  created () {
+    if (this.$ssrContext) {
+      this.$ssrContext.title = this.$title
+      this.$ssrContext.lang = this.$lang
+      this.$ssrContext.description = this.$page.description || this.$description
+    }
+  },
+
+  mounted () {
+    // update title / meta tags
+    this.currentMetaTags = new Set()
+
+    const updateMeta = () => {
+      document.title = this.$title
+      document.documentElement.lang = this.$lang
+      const userMeta = this.$page.frontmatter.meta || []
+      const meta = userMeta.slice(0)
+      const useGlobalDescription = userMeta.filter(m => m.name === 'description').length === 0
+
+      // #665 Avoid duplicate description meta at runtime.
+      if (useGlobalDescription) {
+        meta.push({ name: 'description', content: this.$description })
+      }
+
+      // Including description meta coming from SSR.
+      const descriptionMetas = document.querySelectorAll('meta[name="description"]')
+      if (descriptionMetas.length) {
+        descriptionMetas.forEach(m => this.currentMetaTags.add(m))
+      }
+
+      this.currentMetaTags = new Set(updateMetaTags(meta, this.currentMetaTags))
+    }
+    this.$watch('$page', updateMeta)
+    updateMeta()
+  },
+
+  beforeDestroy () {
+    updateMetaTags(null, this.currentMetaTags)
+  }
+}
+
+function updateMetaTags (meta, current) {
+  if (current) {
+    [...current].forEach(c => {
+      document.head.removeChild(c)
+    })
+  }
+  if (meta) {
+    return meta.map(m => {
+      const tag = document.createElement('meta')
+      Object.keys(m).forEach(key => {
+        tag.setAttribute(key, m[key])
+      })
+      document.head.appendChild(tag)
+      return tag
+    })
+  }
+}