feat: add read time and word count

src/.vitepress/config.ts

@@ -1,9 +1,43 @@
 import genConfig from "@project-trans/vitepress-theme-project-trans/config";
 import type { ThemeContext } from "@project-trans/vitepress-theme-project-trans/utils";
 import { withThemeContext } from "@project-trans/vitepress-theme-project-trans/utils";
+import path from "path";
 import type { DefaultTheme } from "vitepress";
+import fs from "fs";
 
 type NavConfig = DefaultTheme.Config["nav"];
+function countWords(content: string): number {
+  const cleanedContent = content
+    .replace(/```[\s\S]*?```/g, "") // 移除代码块
+    .replace(/!\[.*?\]\(.*?\)/g, "") // 移除图片链接
+    .replace(/\[.*?\]\(.*?\)/g, "") // 移除普通链接
+    .replace(/<[^>]+(>|$)/g, "") // 移除 HTML 标签
+    .replace(/[.,/#!$%^&*;:{}=\-_`~()]/g, "") // 移除标点符号
+    .replace(/\s+/g, " ") // 将多余的空格归为一个空格
+    .trim(); // 去除首尾空格
+
+  const chineseCharacters =
+    cleanedContent.match(/[\u4E00-\u9FFF\uFF01-\uFFE5]/g) || [];
+  const words = cleanedContent.split(/\s+/).filter(Boolean);
+
+  return chineseCharacters.length + words.length;
+}
+
+function readMarkdownFileContent(filePath: string): string {
+  if (fs.existsSync(filePath)) {
+    return fs.readFileSync(filePath, "utf-8");
+  }
+  return "";
+}
+
+function searchForFirstTitle(filePath: string): string {
+  const content = readMarkdownFileContent(filePath);
+  const title = content.match(/# (.*)/);
+  if (title) {
+    return title[1];
+  }
+  return "";
+}
 
 const nav = [
   { text: "正文", link: "/foreword" },
@@ -41,6 +75,7 @@ const sidebarOptions = [
 
 const themeConfig: ThemeContext = {
   siteTitle: "药娘的天空",
+  SiteTitle: "药娘的天空",
   siteDescription: "一个 2000 年代的跨性别者的故事。",
   siteLogo: "/progynova.png",
   /** Repo */
@@ -58,4 +93,29 @@ const themeConfig: ThemeContext = {
 };
 
 // https://vitepress.dev/reference/site-config
-export default withThemeContext(themeConfig, genConfig);
+export default withThemeContext(themeConfig, () => {
+  const config = genConfig();
+  return {
+    ...config,
+    transformPageData(pageData) {
+      // 构建 Markdown 文件路径
+      const markdownFile = `${pageData.relativePath}`;
+      const filePath = path.join(process.cwd(), "src", markdownFile);
+
+      // 从文件系统读取文件内容
+      const content = readMarkdownFileContent(filePath);
+      const title = searchForFirstTitle(filePath);
+
+      // 统计字数并插入到 Frontmatter
+      const wordCount = countWords(content);
+
+      return {
+        frontmatter: {
+          ...pageData.frontmatter,
+          wordCount, // 将字数写入 Frontmatter
+          autoTitle: title,
+        },
+      };
+    },
+  };
+});

src/.vitepress/env.d.ts

@@ -1,13 +1,13 @@
-declare module 'markdown-it-pangu' {
-  import type { PluginSimple } from 'markdown-it'
+declare module "markdown-it-pangu" {
+  import type { PluginSimple } from "markdown-it";
 
-  const pangu: PluginSimple
-  export default pangu
+  const pangu: PluginSimple;
+  export default pangu;
 }
 
-declare module 'markdown-it-katex' {
-  import type { PluginSimple } from 'markdown-it'
+declare module "markdown-it-katex" {
+  import type { PluginSimple } from "markdown-it";
 
-  const katex: PluginSimple
-  export default katex
+  const katex: PluginSimple;
+  export default katex;
 }

src/.vitepress/theme/Layout.vue

@@ -13,6 +13,7 @@ import {
 } from "@project-trans/vitepress-theme-project-trans/components";
 
 import CopyrightInfo from "./CopyrightInfo.vue";
+import PageInfo from "./PageInfo.vue";
 
 const { Layout } = DefaultTheme;
 </script>
@@ -22,16 +23,19 @@ const { Layout } = DefaultTheme;
     <Layout>
       <template #doc-before>
         <NolebaseHighlightTargetedHeading />
+        <PageInfo />
       </template>
       <template #doc-after>
         <AppFooter />
         <br />
         <CopyrightInfo />
         <p style="text-align: center; margin-top: 40px">
           本站不提供评论服务，如有评论需求，请移步至
-          <a style="color: var(--vp-c-brand-1)"
-            href="https://github.com/transky-book/transky/discussions/categories/%E8%AF%84%E8%AE%BA%E5%8C%BA">GitHub
-            Discussions</a>。
+          <a
+            style="color: var(--vp-c-brand-1)"
+            href="https://github.com/transky-book/transky/discussions/categories/%E8%AF%84%E8%AE%BA%E5%8C%BA"
+            >GitHub Discussions</a
+          >。
         </p>
       </template>
       <template #nav-bar-content-after>
@@ -49,4 +53,9 @@ const { Layout } = DefaultTheme;
   --vp-font-family-base: sans-serif;
   --vp-font-family-mono: monospace;
 }
+
+/* hide the first h1 under vp-doc */
+.vp-doc div h1:first-of-type {
+  display: none;
+}
 </style>

src/.vitepress/theme/PageInfo.vue

@@ -0,0 +1,78 @@
+<script setup lang="ts">
+import { useData } from "vitepress";
+import { computed, onMounted, ref, watchEffect } from "vue";
+import ReadingTime from "./ReadingTime.vue"; // 导入 ReadingTime 组件
+
+// 从 VitePress 获取页面数据
+const { frontmatter, page, theme, lang, site } = useData();
+
+// 计算页面的最后更新时间
+const date = computed(
+  () => new Date(frontmatter.value.lastUpdated ?? page.value.lastUpdated)
+);
+
+// 计算 ISO 格式的日期时间字符串
+const isoDatetime = computed(() => date.value.toISOString());
+
+// 定义一个响应式变量来存储格式化后的日期时间字符串
+const datetime = ref("");
+
+// 避免 hydration 错误，在组件挂载后执行
+onMounted(() => {
+  watchEffect(() => {
+    // 使用国际化 API 格式化日期时间
+    datetime.value = new Intl.DateTimeFormat(
+      theme.value.lastUpdated?.formatOptions?.forceLocale
+        ? lang.value
+        : undefined,
+      theme.value.lastUpdated?.formatOptions ?? {
+        dateStyle: "short",
+        timeStyle: "short",
+      }
+    ).format(date.value);
+  });
+});
+
+// 计算页面的作者信息
+const authors = computed(() => {
+  let author = (frontmatter.value?.author ?? []) as string[];
+  if (!Array.isArray(author)) author = [author];
+  return author;
+});
+
+// 计算显示的作者信息
+const displayAuthors = computed(() => {
+  if (authors.value.length === 0) {
+    return "匿名";
+  } else {
+    return `${authors.value.join(", ")} 等`;
+  }
+});
+</script>
+
+<template>
+  <div>
+    <div class="vp-doc">
+      <h1>
+        {{ frontmatter.autoTitle }}
+      </h1>
+    </div>
+    <div class="mb-10 mt-4 flex flex-wrap gap-4">
+      <div v-if="!theme.HideAuthors" class="inline-flex items-center gap-1">
+        <span class="i-octicon:person" />
+        <span>作者:</span>
+        <span>{{ displayAuthors }}</span>
+      </div>
+
+      <div v-if="!theme.HideLastUpdated" class="inline-flex items-center gap-1">
+        <span class="i-octicon:calendar-16" />
+        <span>{{ theme.lastUpdated?.text || "Last updated" }}:</span>
+        <time :datetime="isoDatetime">{{ datetime }}</time>
+      </div>
+      <ClientOnly>
+        <ReadingTime v-if="!theme.HideReadingTime" />
+        <!-- 添加 ReadingTime 组件 -->
+      </ClientOnly>
+    </div>
+  </div>
+</template>

src/.vitepress/theme/ReadingTime.vue

@@ -0,0 +1,43 @@
+<script setup lang="ts">
+import { useData } from "vitepress";
+import { ref, watch } from "vue";
+
+// 获取页面数据
+const { frontmatter } = useData();
+
+// 计算阅读时间的函数
+function calculateReadingTime(wordCount: number) {
+  const wordsPerMinute = 500; // 假设中文阅读速度为每分钟500字
+  return Math.ceil(wordCount / wordsPerMinute); // 计算预计阅读时间
+}
+
+// 使用 ref 创建响应式变量
+const wordCount = ref(frontmatter.value.wordCount || 0);
+const readingTime = ref(calculateReadingTime(wordCount.value));
+
+// 监听 frontmatter 的变化
+watch(
+  () => frontmatter.value,
+  (newFrontmatter) => {
+    wordCount.value = newFrontmatter.wordCount || 0;
+    readingTime.value = calculateReadingTime(wordCount.value);
+  }
+);
+</script>
+
+<template>
+  <div class="inline-flex items-center gap-4">
+    <div class="inline-flex items-center gap-1">
+      <span class="i-octicon:pencil-16" />
+      <span>字数: {{ wordCount }} </span>
+    </div>
+    <div class="inline-flex items-center gap-1">
+      <span class="i-octicon:book-16" />
+      <span>预计阅读时间: {{ readingTime }} 分钟</span>
+    </div>
+  </div>
+</template>
+
+<style scoped>
+/* 这里可以添加样式 */
+</style>