fix: 修復夜間模式下，閲讀模式代碼塊背景顔色的顯示bug

fix: 修復在 chrome上，進入頁面時，頁面元素會出現模糊到清晰的bug close #479
fix: 修復 文章頁面上滑子菜單圖標文字無法顯示的 bug close #481
improvement: meta description 限制在150字以內 close #480
improvement: pug優化和結構調整

scripts/helpers/inject_head_js.js

@@ -0,0 +1,145 @@
+/**
+ * Butterfly
+ * inject js to head
+ */
+
+'use strict'
+
+hexo.extend.helper.register('inject_head_js', function () {
+  const { darkmode, aside, change_font_size } = this.theme
+
+  const localStore = `
+    win.saveToLocal = {
+      set: function setWithExpiry(key, value, ttl) {
+        if (ttl === 0) return
+        const now = new Date()
+        const expiryDay = ttl * 86400000
+        const item = {
+          value: value,
+          expiry: now.getTime() + expiryDay,
+        }
+        localStorage.setItem(key, JSON.stringify(item))
+      },
+
+      get: function getWithExpiry(key) {
+        const itemStr = localStorage.getItem(key)
+
+        if (!itemStr) {
+          return undefined
+        }
+        const item = JSON.parse(itemStr)
+        const now = new Date()
+
+        if (now.getTime() > item.expiry) {
+          localStorage.removeItem(key)
+          return undefined
+        }
+        return item.value
+      }
+    }
+  `
+
+  // https://stackoverflow.com/questions/16839698/jquery-getscript-alternative-in-native-javascript
+  const getScript = `
+    win.getScript = url => new Promise((resolve, reject) => {
+      const script = document.createElement('script')
+      script.src = url
+      script.async = true
+      script.onerror = reject
+      script.onload = script.onreadystatechange = function() {
+        const loadState = this.readyState
+        if (loadState && loadState !== 'loaded' && loadState !== 'complete') return
+        script.onload = script.onreadystatechange = null
+        resolve()
+      }
+      document.head.appendChild(script)
+    })
+  `
+
+  let darkmodeJs = ''
+  if (darkmode.enable) {
+    darkmodeJs = `
+      win.activateDarkMode = function () {
+        document.documentElement.setAttribute('data-theme', 'dark')
+        if (document.querySelector('meta[name="theme-color"]') !== null) {
+          document.querySelector('meta[name="theme-color"]').setAttribute('content', '#0d0d0d')
+        }
+      }
+      win.activateLightMode = function () {
+        document.documentElement.setAttribute('data-theme', 'light')
+        if (document.querySelector('meta[name="theme-color"]') !== null) {
+          document.querySelector('meta[name="theme-color"]').setAttribute('content', '#ffffff')
+        }
+      }
+      const t = saveToLocal.get('theme')
+    `
+
+    const autoChangeMode = darkmode.autoChangeMode
+
+    if (autoChangeMode === 1) {
+      darkmodeJs += `
+          const isDarkMode = window.matchMedia('(prefers-color-scheme: dark)').matches
+          const isLightMode = window.matchMedia('(prefers-color-scheme: light)').matches
+          const isNotSpecified = window.matchMedia('(prefers-color-scheme: no-preference)').matches
+          const hasNoSupport = !isDarkMode && !isLightMode && !isNotSpecified
+
+          if (t === undefined) {
+            if (isLightMode) activateLightMode()
+            else if (isDarkMode) activateDarkMode()
+            else if (isNotSpecified || hasNoSupport) {
+              const now = new Date()
+              const hour = now.getHours()
+              const isNight = hour <= 6 || hour >= 18
+              isNight ? activateDarkMode() : activateLightMode()
+            }
+            window.matchMedia('(prefers-color-scheme: dark)').addListener(function (e) {
+              if (saveToLocal.get('theme') === undefined) {
+                e.matches ? activateDarkMode() : activateLightMode()
+              }
+            })
+          } else if (t === 'light') activateLightMode()
+          else activateDarkMode()
+        `
+    } else if (autoChangeMode === 2) {
+      darkmodeJs += `
+          const now = new Date()
+          const hour = now.getHours()
+          const isNight = hour <= 6 || hour >= 18
+          if (t === undefined) isNight ? activateDarkMode() : activateLightMode()
+          else if (t === 'light') activateLightMode()
+          else activateDarkMode()
+        `
+    } else {
+      darkmodeJs += `
+          if (t === 'dark') activateDarkMode()
+          else if (t === 'light') activateLightMode()
+        `
+    }
+  }
+
+  let asideStatus = ''
+  if (aside.enable && aside.button) {
+    asideStatus = `
+      const asideStatus = saveToLocal.get('aside-status')
+      if (asideStatus !== undefined) {
+        if (asideStatus === 'hide') {
+          document.documentElement.classList.add('hide-aside')
+        } else {
+          document.documentElement.classList.remove('hide-aside')
+        }
+      }
+    `
+  }
+
+  let changFontAside = ''
+  if (change_font_size) {
+    changFontAside = `
+    const fontSizeVal = saveToLocal.get('global-font-size')
+    if (fontSizeVal !== undefined) {
+      document.documentElement.style.setProperty('--global-font-size', fontSizeVal + 'px')
+    }
+    `
+  }
+
+  return `<script>(win=>{${localStore + getScript + darkmodeJs + asideStatus + changFontAside}})(window)</script>`
+})

scripts/helpers/page.js

@@ -15,7 +15,7 @@ hexo.extend.helper.register('page_description', function () {
   let description = page.description || page.content || page.title || config.description
 
   if (description) {
-    description = escapeHTML(stripHTML(description).substring(0, 200)
+    description = escapeHTML(stripHTML(description).substring(0, 150)
       .trim()
     ).replace(/\n/g, ' ')
     return description