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将 Starlight 转换为 PDF:经验和见解

来源:dev.to

时间:2025-01-15 23:00:50 410浏览 收藏

哈喽!大家好,很高兴又见面了,我是golang学习网的一名作者,今天由我给大家带来一篇《将 Starlight 转换为 PDF:经验和见解》,本文主要会讲到等等知识点,希望大家一起学习进步,也欢迎大家关注、点赞、收藏、转发! 下面就一起来看看吧!

想象一下您收到一项任务:在一周内创建一个新的文档网站。它应该具有视觉吸引力、快速且易于导航。您会收到一堆 *.docs 文件、图像和屏幕截图,以及“完成它”.

的说明

有很多优秀的工具可供选择,例如docusaurusnextravitepressdocus等等。之前,我在使用 starlight 构建文档网站方面获得了丰富的经验,因此我选择了它来完成这项任务。然而,我发现了一个缺失的功能:从文档生成 pdf 的能力。这是要求之一。 “听起来像是一个不错的副业项目,”我自己想的。

解决任务

起初,这似乎很简单:获取页面,解析 html,对内容进行分组,瞧!

星光驱动的网站有一个“下一步”按钮来浏览文档。由于 pdf 本质上是页面数组,因此使用“下一步”按钮逐一解析它们似乎是合乎逻辑的。由于网站生成静态页面,我很快编写了一个脚本来获取 html、查询必要的部分,并将所有内容组合在一起。然而,事实证明,生成保留网站样式的 pdf 更为复杂。经过一番头脑风暴,我意识到 puppeteer 是最好的解决方案。

现在流程变得清晰了:

  1. 确定起始页面。这是带有“下一步”按钮的第一页。
  2. 浏览页面。从每个页面提取标题和主要内容,同时构建目录。
  3. 合并内容。添加分页符和其他样式。
  4. 准备最终的 html。 使用生成的 html 重写初始页面的 。
  5. 加载资源。滚动页面至底部加载所有图片。
  6. 生成 pdf。puppeteer 的 page.pdf() 方法可以解决这个问题。
  7. 完成!

这就是starlight-to-pdf 的工作原理。遵循这种模式,您可以为缺乏 pdf 导出功能的其他文档框架构建类似的工具。

后续步骤

基本功能准备就绪后,就该添加一些额外功能了。以下是最有趣和最具挑战性的功能。

添加页眉和页脚

页眉或页脚中包含页码和一些附加信息是很好的。 puppeteer 的 page.pdf() 方法接受 headertemplate 和 footertemplate 选项。这些选项接受 html 字符串。 puppeteer 自动将值注入到具有特定实用程序类的元素中:

  • .date:格式化日期;
  • .title:网页的标签值;</li> <li> .url: 调用打印函数的页面 url;</li> <li> .pagenumber:当前页码;</li> <li> .totalpages: 文档的总页数。</li> </ul><p>当我们在打印之前将所有内容合并在一页上时,标题和网址对我们来说没有太大价值:插入的值将始终保持不变。然而,其他课程有很大帮​​助。这是页脚模板示例:<br></p> <pre class="brush:php;toolbar:false"><style> .footer-container { --color: #000; display: flex; align-items: center; justify-content: space-between; border-block-start: 1px solid var(--color); color: var(--color); font-size: 10px; font-family: arial, helvetica, sans-serif; margin-inline: 1.5cm 1cm; padding-block: 0.25cm 0.5cm; width: 100%; } </style> <div class="footer-container"> <div>awesome docs</div> <div> <!-- numbers inside the elements with `.pagenumber` and `.totalpages` classes are injected automatically by puppeteer --> <span class="pagenumber"></span> / <span class="totalpages"></span> </div> <!-- same for the `.date` class value --> <div class="date"></div> </div> </pre> <p>要使用此功能,请不要忘记将 displayheaderfooter 属性设置为 true:<br></p> <pre class="brush:php;toolbar:false">import puppeteer from 'puppeteer'; const browser = await puppeteer.launch(); const page = await browser.newpage(); await page.goto('https://someurl'); const footertemplatestr = '<style>...<style><div>...</div>' // replace with the html string from the example above await page.pdf({ displayheaderfooter: true, footertemplate: footertemplatestr }) </pre> <p>以下是您应该牢记的一些发现:</p> <ul><li>模板必须是有效的 html 结构。</li> <li>定义 font-size css 属性,puppeteer 的默认值为 0。</li> <li>使用内联 <style> 标签来定义您的样式。网站样式在模板内不可用。</li> <li>图像应编码为 base64 字符串。</li> <li>使用 puppeteer 的边距选项来实现所需的布局。</li> </ul><h3> cli 样式怎么样? </h3> <p>一切正常,生成的 pdf 看起来很棒,但终端消息感觉平淡无奇。对细节的关注将好与伟大区分开来,不是吗?让我们的消息更加丰富多彩、更易于阅读。</p> <p>这就是 ansi 转义序列的魔力。我认为 4 位颜色足以完成这项工作。假设您想要红色背景上的白色文本<em>(这就是我用于[错误]:错误消息之前的前缀)</em>。以下是实现这种外观的方法:<br></p> <pre class="brush:php;toolbar:false">console.log('\x1b[37;41m', 'white on red message'); </pre> <p>让我们来分解一下:</p> <ul><li> x1b[ 是十六进制转义码(您也可以使用 u001b 作为 unicode 替代);</li> <li> 37 是前景色白色,其中 3 代表前景色,7 代表白色;</li> <li> 41 是背景红色,其中 4 代表背景,1 代表红色。</li> </ul><p>一切正常,但现在我们所有的 console.log() 输出都将以这种方式设置样式。要将样式重置回默认值,只需在末尾添加重置序列 x1b[0m:<br></p> <pre class="brush:php;toolbar:false">console.log('\x1b[37;41m', 'white on red message', '\x1b[0m'); </pre> <p>好多了。如果我们想要在灰色背景上显示粗体青色文本<em>(4 位颜色名称中的亮黑色)</em>,该怎么办?很简单:<br></p> 98262315536​​3 <p>以下是每个部分的作用:</p> <ul><li> 1 转义码后应用粗体效果;</li> <li> 36 设置文本颜色为青色;</li> <li> 100 将背景更改为亮黑色,其中 10 表示<em>明亮</em>,0 是<em>黑色</em>的代码。</li> </ul><p>利用这些知识,您可以使您的 cli 工具在视觉上更具吸引力。例如,我在项目中将所有 url 和文件路径设置为带下划线的蓝色文本:<br></p> <pre class="brush:php;toolbar:false">console.log('\x1b[4;34m', './underlined/blue', '\x1b[0m') </pre> <p>查看此备忘单以了解有关该主题的更多信息。</p> <h2> 总结 </h2> <p>你永远不知道日常任务什么时候可能会激发出有益的副业项目。 starlight-to-pdf 的开发为 puppeteer 和 cli 样式提供了宝贵的经验,并且开源社区中出现了一种新工具。这是一个快速演示:</p> <p><img src="/uploads/20250115/17369532276787cd8b80721.gif" alt="starlight-to-pdf usage demo" loading="lazy" style="max-width:100%" style="max-width:100%" data-animated="true"></p> <p>本篇关于《将 Starlight 转换为 PDF:经验和见解》的介绍就到此结束啦,但是学无止境,想要了解学习更多关于文章的相关知识,请关注golang学习网公众号!</p> </div> <div class="labsList"> </div> <div class="articleStatement"> <span class="aRed">声明:</span><b>本文转载于:dev.to 如有侵犯,请联系<a href="javascript:;" class="aRed">study_golang@163.com</a>删除</b> </div> </div> <!-- 最新阅读 --> <div class="contBoxNor"> <div class="contTit"> <div class="tit">相关阅读</div> <a href="/articlelist.html" class="more">更多></a> </div> <ul class="latestReadList"> <li> <div class="info"> <a href="/articlelist/19_new_0_1.html" class="aLightGray" title="文章">文章</a> · <a href="/articlelist/88_new_0_1.html" class="aLightGray" title="前端">前端</a>   |  1年前  |   <a href="javascript:;" class="aLightGray" title="提升">提升</a> <a href="javascript:;" class="aLightGray" title="箭头函数">箭头函数</a> <a href="javascript:;" class="aLightGray" title="函数表达式">函数表达式</a> <a href="javascript:;" class="aLightGray" title="函数声明">函数声明</a> <a href="javascript:;" class="aLightGray" title="Function构造函数">Function构造函数</a> </div> <div class="tit 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