jekyll-code-example-tag

Provides a tag that allows you to include in your posts and pages code examples for multiple languages that are kept in separate files. Another tag allows you to combine all code examples that are on a page.

Add the following to your application's Gemfile:

gem 'jekyll-code-example-tag'

and then execute:

bundle install

Or install it manually:

gem install jekyll-code-example-tag

Then, include a script tag in your page or layout to fetch the required javascript:

<script type="text/javascript" src="/js/jekyll-code-example-buttons.js"></script>

You may also overwrite the provided javascript by writing a jekyll-code-example-buttons.js file in the /js/ directory of your Jekyll project.

Via your site's _config.yml, you can define what CSS class or classes the example buttons and button containers will have. For example:

code_example_buttons_class: 'the_buttons'
code_example_button_class: 'a_button'

will cause each button to have the class a_button, and buttons will be inside a div with the class the_buttons.

code_example_buttons_class defaults to 'buttons', and code_example_button_class defaults to 'button'.

Same is true for code_example_list_class which controls the class used for the <li> and <ul> tags. The default class is 'code-tab' which can be changed by setting:

code_example_list_class: my-list-class

in _config.yml.

First, select a folder to place your code examples in. By default, the top level folder code_examples will be used. If you would like to store your examples in a different folder, than create and set a code_example_dir setting in your _config.yaml:

code_example_dir: assets/code/examples

Now, add some code examples. Create folders for each language you would like to provide a code example for. Then, add files to each language folder that contain language appropriate code examples.

For example, say we would like to include some Hello World examples in Ruby and Python. First, assuming we are using the default code examples directory, we would add the following to your project:

.
|-code_examples
  |-ruby
    |-hello_world
  |-python
    |-hello_world

ruby/hello_world could contain

puts "Hello World"

while python/hello_world could contain

print "Hello World"

Now, create a post that includes these code examples. Include a code example in a page or posting with the code_example tag:

---
title: Starting to Program
---

Here is everybody's favorite first program, in Ruby and Python.

{% code_example hello_world %}

Build your site, and you will find a page that contains the following markup:

<p>Here is everybody's favorite first program, in Ruby and Python.</p>

<div class="code-examples">            
  <div class="buttons examples">
    <ul>
      <li><a href="#" class="button active" target="Python">Python</a></li>
      <li><a href="#" class="button" target="ruby">Ruby</a></li>
    </ul>
  </div>
  <div class="highlight example python" style="display: block;">
    <pre><code class="language-python" data-lang="python">print "Hello World"</code></pre>
  </div>
  <div class="highlight example ruby" style="display: none;">
        <pre><code class="language-ruby" data-lang="ruby">puts "Hello World"</code></pre>
  </div>
</div>

The code_example tag will search the folders in your code examples directory for files that match whatever string is given to it, and will include only languages/files that match it. Thus, if you add a goodbye_world example in just Ruby:

.
|-code_examples
  |-ruby
    |-goodbye_world
    |-hello_world
  |-python
    |-hello_world

and include it in a post:

{% code_example goodbye_world %}

the resulting markup will include just the Ruby example:

<div class="code-examples">            
  <div class="buttons examples">
    <ul>
      <li><a href="#" class="button" target="ruby">Ruby</a></li>
    </ul>
  </div>
  <div class="highlight example ruby" style="display: none;">
        <pre><code class="language-ruby" data-lang="ruby">puts "Goodbye World"</code></pre>
  </div>
</div>

The code_example tag can also support examples organized in sub directories. For example, say you would like to organize some of your code examples by product and API version:

.
|-code_examples
  |-productA
    |-api_v1
      |-ruby
        |-widget_maker
      |-python
        |-widget_maker
    |-api_v2
      |-ruby
        |-widget_maker
      |-python
        |-widget_maker
  |-productB
    |-api_v1
      |-ruby
        |-authenticating
      |-python
        |-authenticating
  |-ruby
    |-hello_world
  |-python
    |-hello_world

With the above directory structure, including any of the following calls to code_example will result in including only the relevant code examples from the referred to directory:

{% code_example productA/api_v1/widget_maker %}
{% code_example productA/api_v2/widget_maker %}
{% code_example productB/api_v1/authenticating %}
{% code_example hello_world %}

If you have included a few code examples on a page via the code_example tag, you can provide your readers with an easy to copy version of all of your examples by using the all_page_code_examples tag:

{% all_page_code_examples %}