fix: 修復隨機封面死循環的問題

package.json

@@ -1,6 +1,6 @@
 {
   "name": "hexo-theme-butterfly",
-  "version": "5.3.0",
+  "version": "5.3.1",
   "description": "A Simple and Card UI Design theme for Hexo",
   "main": "package.json",
   "scripts": {

scripts/filters/random_cover.js

@@ -5,23 +5,32 @@
 'use strict'
 
 hexo.extend.generator.register('post', locals => {
-  const recentCovers = []
-  const randomCoverFn = () => {
-    const { cover: { default_cover: defaultCover } } = hexo.theme.config
+  const previousIndexes = []
+
+  const getRandomCover = defaultCover => {
     if (!defaultCover) return false
     if (!Array.isArray(defaultCover)) return defaultCover
-    const defaultCoverLen = defaultCover.length
-    const limit = 3
 
-    let num
+    const coverCount = defaultCover.length
+
+    if (coverCount === 1) {
+      return defaultCover[0]
+    }
+
+    const maxPreviousIndexes = coverCount === 2 ? 1 : (coverCount === 3 ? 2 : 3)
+
+    let index
     do {
-      num = Math.floor(Math.random() * defaultCoverLen)
-    } while (recentCovers.includes(num))
+      index = Math.floor(Math.random() * coverCount)
+    } while (previousIndexes.includes(index) && previousIndexes.length < coverCount)
 
-    recentCovers.push(num)
-    if (recentCovers.length > limit) recentCovers.shift()
+    previousIndexes.push(index)
+    if (previousIndexes.length > maxPreviousIndexes) {
+      previousIndexes.shift()
+    }
 
-    return defaultCover[num]
+    console.log(defaultCover[index])
+    return defaultCover[index]
   }
 
   const handleImg = data => {
@@ -30,15 +39,20 @@ hexo.extend.generator.register('post', locals => {
 
     // Add path to top_img and cover if post_asset_folder is enabled
     if (hexo.config.post_asset_folder) {
-      if (topImg && topImg.indexOf('/') === -1 && imgTestReg.test(topImg)) data.top_img = `${data.path}${topImg}`
-      if (coverVal && coverVal.indexOf('/') === -1 && imgTestReg.test(coverVal)) data.cover = `${data.path}${coverVal}`
+      if (topImg && topImg.indexOf('/') === -1 && imgTestReg.test(topImg)) {
+        data.top_img = `${data.path}${topImg}`
+      }
+      if (coverVal && coverVal.indexOf('/') === -1 && imgTestReg.test(coverVal)) {
+        data.cover = `${data.path}${coverVal}`
+      }
     }
 
     if (coverVal === false) return data
 
     // If cover is not set, use random cover
     if (!coverVal) {
-      const randomCover = randomCoverFn()
+      const { cover: { default_cover: defaultCover } } = hexo.theme.config
+      const randomCover = getRandomCover(defaultCover)
       data.cover = randomCover
       coverVal = randomCover // update coverVal
     }
@@ -50,11 +64,9 @@ hexo.extend.generator.register('post', locals => {
     return data
   }
 
-  return locals.posts.sort('date').map(post => {
-    return {
-      data: handleImg(post),
-      layout: 'post',
-      path: post.path
-    }
-  })
+  return locals.posts.sort('date').map(post => ({
+    data: handleImg(post),
+    layout: 'post',
+    path: post.path
+  }))
 })