update theme to butterfly

themes/butterfly/scripts/helpers/related_post.js

@@ -9,14 +9,22 @@
 
 const { postDesc } = require('../common/postDesc')
 
-hexo.extend.helper.register('related_posts', function (currentPost, allPosts) {
-  let relatedPosts = []
+hexo.extend.helper.register('related_posts', function (currentPost) {
+  const relatedPosts = new Map()
   const tagsData = currentPost.tags
-  tagsData.length && tagsData.forEach(function (tag) {
-    allPosts.forEach(function (post) {
-      if (currentPost.path !== post.path && isTagRelated(tag.name, post.tags)) {
+
+  if (!tagsData || !tagsData.length) return ''
+
+  tagsData.forEach(tag => {
+    const posts = tag.posts
+    posts.forEach(post => {
+      if (currentPost.path === post.path) return
+
+      if (relatedPosts.has(post.path)) {
+        relatedPosts.get(post.path).weight += 1
+      } else {
         const getPostDesc = post.postDesc || postDesc(post, hexo)
-        const relatedPost = {
+        relatedPosts.set(post.path, {
           title: post.title,
           path: post.path,
           cover: post.cover,
@@ -24,22 +32,17 @@ hexo.extend.helper.register('related_posts', function (currentPost, allPosts) {
           weight: 1,
           updated: post.updated,
           created: post.date,
-          postDesc: getPostDesc
-        }
-        const index = findItem(relatedPosts, 'path', post.path)
-        if (index !== -1) {
-          relatedPosts[index].weight += 1
-        } else {
-          relatedPosts.push(relatedPost)
-        }
+          postDesc: getPostDesc,
+          random: Math.random()
+        })
       }
     })
   })
 
-  if (relatedPosts.length === 0) {
+  if (relatedPosts.size === 0) {
     return ''
   }
-  let result = ''
+
   const hexoConfig = hexo.config
   const config = hexo.theme.config
 
@@ -47,51 +50,42 @@ hexo.extend.helper.register('related_posts', function (currentPost, allPosts) {
   const dateType = config.related_post.date_type || 'created'
   const headlineLang = this._p('post.recommend')
 
-  relatedPosts = relatedPosts.sort(compare('weight'))
-
-  if (relatedPosts.length > 0) {
-    result += '<div class="relatedPosts">'
-    result += `<div class="headline"><i class="fas fa-thumbs-up fa-fw"></i><span>${headlineLang}</span></div>`
-    result += '<div class="relatedPosts-list">'
-
-    for (let i = 0; i < Math.min(relatedPosts.length, limitNum); i++) {
-      let { cover, title, path, cover_type, created, updated, postDesc } = relatedPosts[i]
-      const { escape_html, url_for, date } = this
-      cover = cover || 'var(--default-bg-color)'
-      title = escape_html(title)
-      const className = postDesc ? 'pagination-related' : 'pagination-related no-desc'
-      result += `<a class="${className}" href="${url_for(path)}" title="${title}">`
-      if (cover_type === 'img') {
-        result += `<img class="cover" src="${url_for(cover)}" alt="cover">`
-      } else {
-        result += `<div class="cover" style="background: ${cover}"></div>`
-      }
-      if (dateType === 'created') {
-        result += `<div class="info text-center"><div class="info-1"><div class="info-item-1"><i class="far fa-calendar-alt fa-fw"></i> ${date(created, hexoConfig.date_format)}</div>`
-      } else {
-        result += `<div class="info text-center"><div class="info-1"><div class="info-item-1"><i class="fas fa-history fa-fw"></i> ${date(updated, hexoConfig.date_format)}</div>`
-      }
-      result += `<div class="info-item-2">${title}</div></div>`
-
-      if (postDesc) {
-        result += `<div class="info-2"><div class="info-item-1">${postDesc}</div></div>`
-      }
-      result += '</div></a>'
+  const relatedPostsList = Array.from(relatedPosts.values()).sort((a, b) => {
+    if (b.weight !== a.weight) {
+      return b.weight - a.weight
     }
+    return b.random - a.random
+  })
 
-    result += '</div></div>'
-    return result
+  let result = '<div class="relatedPosts">'
+  result += `<div class="headline"><i class="fas fa-thumbs-up fa-fw"></i><span>${headlineLang}</span></div>`
+  result += '<div class="relatedPosts-list">'
+
+  for (let i = 0; i < Math.min(relatedPostsList.length, limitNum); i++) {
+    let { cover, title, path, cover_type, created, updated, postDesc } = relatedPostsList[i]
+    const { escape_html, url_for, date } = this
+    cover = cover || 'var(--default-bg-color)'
+    title = escape_html(title)
+    const className = postDesc ? 'pagination-related' : 'pagination-related no-desc'
+    result += `<a class="${className}" href="${url_for(path)}" title="${title}">`
+    if (cover_type === 'img') {
+      result += `<img class="cover" src="${url_for(cover)}" alt="cover">`
+    } else {
+      result += `<div class="cover" style="background: ${cover}"></div>`
+    }
+    if (dateType === 'created') {
+      result += `<div class="info text-center"><div class="info-1"><div class="info-item-1"><i class="far fa-calendar-alt fa-fw"></i> ${date(created, hexoConfig.date_format)}</div>`
+    } else {
+      result += `<div class="info text-center"><div class="info-1"><div class="info-item-1"><i class="fas fa-history fa-fw"></i> ${date(updated, hexoConfig.date_format)}</div>`
+    }
+    result += `<div class="info-item-2">${title}</div></div>`
+
+    if (postDesc) {
+      result += `<div class="info-2"><div class="info-item-1">${postDesc}</div></div>`
+    }
+    result += '</div></a>'
   }
+
+  result += '</div></div>'
+  return result
 })
-
-function isTagRelated (tagName, tags) {
-  return tags.some(tag => tag.name === tagName)
-}
-
-function findItem (arrayToSearch, attr, val) {
-  return arrayToSearch.findIndex(item => item[attr] === val)
-}
-
-function compare (attr) {
-  return (a, b) => b[attr] - a[attr]
-}