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新年第一炮，轻松加愉快的，来完成一些年前准备写的文章。Jekyll 中格式化代码有很多种方式，在这里说说几种的实现方式。
Jekyll
Jekyll 是一种通过模版和数据编译为HTML的工具，说是工具，但是也可以说是服务，如果借助Github（搭建有Jekyll服务，可以实时编译）可以做出半动态网页；对于没有自己服务器的朋友来说是不错的选择。
一般情况下，使用Github＋Jekyll来搭建博客和一些说明性质的网页。
之前有发表WIN系统下搭建的文章：[环境搭建]Windows下安装Ruby和Jekyll
，至于Mac下就用命令行搞定了。
代码高亮
代码高亮可以说是程序员必备，无论是搭建模块，或者是产品的说明网站都是需要展示代码的，而代码的样式直接的影响了阅读效果，一个好的代码高亮插件将会有好的体验。
官方说明
http://jekyllrb.com/docs/posts/#highlighting-code-snippets
在官方文档中可以看见其代码是非常简单的：
{% highlight ruby %}def show @widget = Widget(params[:id]) respond_to do |format| format.html # show.html.erb format.json { render json: @widget } endend{% endhighlight %} 得到的效果也就是：
当然，不同的代码高亮插件也需要不同的编译代码。
其实高亮插件也就是JS查找HTML中特定的节点，并对特定节点赋予特定css，而css的结果也就是给代码上色；所以纯粹说代码高亮的话就与Jekyll无关了，在这里要说的是Jekyll＋MD文件＋CODE 的方式。
Pygments
这个算是很多Jekyll 教程中使用的了，在大部分的高亮博客中基本都是使用的该高亮器。编译的时候需要先安装Python。
安装后我们执行命令：
gem install pygments.rb
安装好了后，我们需要修改Jekyll项目的**_config.yml** 文件，修改其中的 highlighter 为：
markdown: kramdownhighlighter: pygments
然后重启Jekyll服务。
Code
<head> <title>pygments</title> <link media="all" rel="stylesheet" type="text/css" href="../assets/pygments/pygments.css" /></head><body> {% highlight ruby %} def show @widget = Widget(params[:id]) respond_to do |format| format.html # show.html.erb format.json { render json: @widget } end end {% endhighlight %}</body> 很多人都不知道这个css文件从哪来；大部分都是拷贝拷贝再拷贝，而且都是6～7年前的了。
其实有多种办法得到：
第一种
命令行模式，太复杂了，详细见：
http://pygments.org/docs/styles/
第二种
直接下载，打开网页：http://pygments.org/demo/3666780/ 右边可以选择样式，选择GO就可以看见效果，而此时打开浏览器调试，可以看见其中有一个 pygments.css 文件，下载即可。
Show
Rouge
这个个人比较喜欢，上色比较纯净，看着舒服。比Pygments支持语言少一些，如果是使用的 Pygments ，哪么基本不用更改任何源码，只需要更改css引用就OK。当然rouge也是Jekyll默认的高亮编译。
开源项目地址：https://github.com/jneen/rouge
首先修改Jekyll项目的**_config.yml** 文件，修改其中的 highlighter 为：
markdown: kramdownhighlighter: rouge
然后重启Jekyll服务。
Code
<head> <title>Rouge</title> <link media="all" rel="stylesheet" type="text/css" href="../assets/rouge/rouge.css" /> <style> pre{ background: rgba(0, 0, 0, 0.95); } </style></head><body> {% highlight ruby %} def show @widget = Widget(params[:id]) respond_to do |format| format.html # show.html.erb format.json { render json: @widget } end end {% endhighlight %}</body> 默认的 rouge 主题偏向于白色，所以我设置了背景为黑色。
这里也是需要 rouge.css 文件，此时我们使用命令行来得到：
rougify style monokai.sublime > rouge.css
这样就能生成一个默认的css文件，当然更多的主题生成详见开源项目说明。
Show
Highlight JS
总的来说，Highlight算是比较广泛，使用用户量也挺高的了。效果不错，支持语言多。
Highlight 可以完美兼容 Rouge 与 Pygments ，所以不需要修改任何配置，只需要更改一下css与js引用就OK。
下载地址：https://highlightjs.org/
Code
<head> <title>Highlight.js</title> <link rel="stylesheet" href="http://cdnjs.cloudflare.com/ajax/libs/highlight.js/9.1.0/styles/default.min.css"> <script src="http://cdnjs.cloudflare.com/ajax/libs/highlight.js/9.1.0/highlight.min.js"></script> <script type="text/javascript"> hljs.initHighlightingOnLoad(); </script></head><body> {% highlight ruby %} def show @widget = Widget(params[:id]) respond_to do |format| format.html # show.html.erb format.json { render json: @widget } end end {% endhighlight %}</body> 当然你也可以直接使用HTML在MD文档中：
<pre class='brush:html;toolbar:false;'>...
Show
样式有多种，可以任意选择。
SyntaxHighlighter
这算是比较老的一种代码高亮插件了，去年迁移了一次，现在在Github上维护，质量挺好的，V4版本不错。
官方地址：https://github.com/syntaxhighlighter/syntaxhighlighter
首先下载, 然后自己使用命令编译：
https://github.com/syntaxhighlighter/syntaxhighlighter/releases
https://github.com/syntaxhighlighter/syntaxhighlighter/wiki/Building
编译后可以得到 js 与 css 文件；当然使用命令不同样式可以有几种可以选择。
Code
<head> <title>SyntaxHighlighter</title> <link media="all" rel="stylesheet" type="text/css" href="../assets/syntax/theme.css" /> <script type="text/javascript" src="../assets/syntax/syntaxhighlighter.js"></script></head><body> <pre class="brush: ruby"> def show @widget = Widget(params[:id]) respond_to do |format| format.html # show.html.erb format.json { render json: @widget } end end 
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