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Markup: Syntax Highlighting
Post displaying the various ways one can highlight code blocks with Jekyll. Some options include standard Markdown, GitHub Flavored Markdown, and Jekyll's `{% highlight %}` tag.
2017-03-09 10:27:01 -0500
code
syntax highlighting

Syntax highlighting is a feature that displays source code, in different colors and fonts according to the category of terms. This feature facilitates writing in a structured language such as a programming language or a markup language as both structures and syntax errors are visually distinct. Highlighting does not affect the meaning of the text itself; it is intended only for human readers.^1

GFM Code Blocks

GitHub Flavored Markdown fenced code blocks are supported by default with Jekyll. You may need to update your _config.yml file to enable them if you're using an older version.

kramdown:
  input: GFM

Here's an example of a CSS code snippet written in GFM:

#container {
  float: left;
  margin: 0 -240px 0 0;
  width: 100%;
}

Yet another code snippet for demonstration purposes:

module Jekyll
  class TagIndex < Page
    def initialize(site, base, dir, tag)
      @site = site
      @base = base
      @dir = dir
      @name = 'index.html'
      self.process(@name)
      self.read_yaml(File.join(base, '_layouts'), 'tag_index.html')
      self.data['tag'] = tag
      tag_title_prefix = site.config['tag_title_prefix'] || 'Tagged: '
      tag_title_suffix = site.config['tag_title_suffix'] || '&#8211;'
      self.data['title'] = "#{tag_title_prefix}#{tag}"
      self.data['description'] = "An archive of posts tagged #{tag}."
    end
  end
end

Jekyll Highlight Liquid Tag

Jekyll also has built-in support for syntax highlighting of code snippets using either Rouge or Pygments, using a dedicated Liquid tag as follows:

{% raw %}{% highlight scss %}
.highlight {
  margin: 0;
  padding: 1em;
  font-family: $monospace;
  font-size: $type-size-7;
  line-height: 1.8;
}
{% endhighlight %}{% endraw %}

And the output will look like this:

{% highlight scss %} .highlight { margin: 0; padding: 1em; font-family: $monospace; font-size: $type-size-7; line-height: 1.8; } {% endhighlight %}

Here's an example of a code snippet using the Liquid tag and linenos enabled.

{% highlight html linenos %} {% raw %}

{% if page.previous %} Previous article {% endif %} {% if page.next %} Next article {% endif %}

{% endraw %} {% endhighlight %}

Code Blocks in Lists

Indentation matters. Be sure the indent of the code block aligns with the first non-space character after the list item marker (e.g., 1.). Usually this will mean indenting 3 spaces instead of 4.

  1. Do step 1.

  2. Now do this:

    def print_hi(name)
      puts "Hi, #{name}"
    end
    print_hi('Tom')
    #=> prints 'Hi, Tom' to STDOUT.
  3. Now you can do this.

GitHub Gist Embed

GitHub Gist embeds can also be used:

<script src="https://gist.github.com/mmistakes/77c68fbb07731a456805a7b473f47841.js"></script>

Which outputs as:

<script src="https://gist.github.com/mmistakes/77c68fbb07731a456805a7b473f47841.js"></script>