hugo/docs/content/extras/shortcodes.md

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/doc/shortcodes/	2013-07-01	main parent extras	/extras/highlighting	/extras/permalinks	Shortcodes	80

Hugo uses Markdown for its simple content format. However, there’s a lot of things that Markdown doesn’t support well.

We are unwilling to accept being constrained by our simple format. Also unacceptable is writing raw HTML in our Markdown every time we want to include unsupported content such as a video. To do so is in complete opposition to the intent of using a bare bones format for our content and utilizing templates to apply styling for display.

To avoid both of these limitations, Hugo created shortcodes.

A shortcode is a simple snippet inside a content file that Hugo will render using a predefined template. Note that shortcodes will not work in template files---if you need a functionality like that in a template, you most likely want a partial template instead.

Using a shortcode

In your content files, a shortcode can be called by using '{{%/* name parameters */%}}' respectively. Shortcodes are space delimited (parameters with spaces can be quoted).

The first word is always the name of the shortcode. Parameters follow the name. The format for named parameters models that of HTML with the format name="value".

Some shortcodes use or require closing shortcodes. Like HTML, the opening and closing shortcodes match (name only), the closing being prepended with a slash.

Example of a paired shortcode:

{{</* highlight go */>}} A bunch of code here {{</* /highlight */>}}

The examples above use two different delimiters, the difference being the % and the < character:

Shortcodes with Markdown

The % characters indicates that the shortcode's inner content needs further processing by the page's rendering processor (i.e. Markdown), needed to get the bold text in the example below:

{{%/* myshortcode */%}}Hello **World!**{{%/* /myshortcode */%}}

Shortcodes without Markdown

The < character indicates that the shortcode's inner content doesn't need any further rendering, this will typically be pure HTML:

{{</* myshortcode */>}}<p>Hello <strong>World!</strong></p>{{</* /myshortcode */>}}

Hugo Shortcodes

Hugo ships with a set of predefined shortcodes.

highlight

This shortcode will convert the source code provided into syntax highlighted HTML. Read more on highlighting.

Usage

highlight takes exactly one required parameter of language and requires a closing shortcode.

Example

{{</* highlight html */>}}
<section id="main">
  <div>
   <h1 id="title">{{ .Title }}</h1>
    {{ range .Data.Pages }}
        {{ .Render "summary"}}
    {{ end }}
  </div>
</section>
{{</* /highlight */>}}

Example Output

<span style="color: #f92672">&lt;section</span> <span style="color: #a6e22e">id=</span><span style="color: #e6db74">&quot;main&quot;</span><span style="color: #f92672">&gt;</span>
  <span style="color: #f92672">&lt;div&gt;</span>
   <span style="color: #f92672">&lt;h1</span> <span style="color: #a6e22e">id=</span><span style="color: #e6db74">&quot;title&quot;</span><span style="color: #f92672">&gt;</span>{{ .Title }}<span style="color: #f92672">&lt;/h1&gt;</span>
    {{ range .Data.Pages }}
        {{ .Render &quot;summary&quot;}}
    {{ end }}
  <span style="color: #f92672">&lt;/div&gt;</span>
<span style="color: #f92672">&lt;/section&gt;</span>

figure

figure is simply an extension of the image capabilities present with Markdown. figure provides the ability to add captions, CSS classes, alt text, links etc.

Usage

figure can use the following parameters:

• src
• link
• title
• caption
• attr (attribution)
• attrlink
• alt

Example

{{</* figure src="/media/spf13.jpg" title="Steve Francia" */>}}

Example output

<figure>
    <img src="/media/spf13.jpg"  />
    <figcaption>
        <h4>Steve Francia</h4>
    </figcaption>
</figure>

ref, relref

These shortcodes will look up the pages by their relative path (e.g., blog/post.md) or their logical name (post.md) and return the permalink (ref) or relative permalink (relref) for the found page.

ref and relref also make it possible to make fragmentary links that work for the header links generated by Hugo.

Read more on [cross-references]({{% ref "extras/crossreferences.md" %}}).

Usage

ref and relref take exactly one required parameter of reference.

Example

[Neat]({{</* ref "blog/neat.md" */>}})
[Who]({{</* relref "about.md#who" */>}})

Example Output

Assuming that standard Hugo pretty URLs are turned on.

<a href="/blog/neat">Neat</a>
<a href="/about/#who:c28654c202e73453784cfd2c5ab356c0">Who</a>

Creating your own shortcodes

To create a shortcode, place a template in the layouts/shortcodes directory. The template name will be the name of the shortcode.

In creating a shortcode, you can choose if the shortcode will use positional parameters or named parameters (but not both). A good rule of thumb is that if a shortcode has a single required value in the case of the youtube example below, then positional works very well. For more complex layouts with optional parameters, named parameters work best.

Inside the template

To access a parameter by position, the .Get method can be used:

{{ .Get 0 }}

To access a parameter by name, the .Get method should be utilized:

{{ .Get "class" }}

with is great when the output depends on a parameter being set:

{{ with .Get "class"}} class="{{.}}"{{ end }}

.Get can also be used to check if a parameter has been provided. This is most helpful when the condition depends on either one value or another... or both:

{{ or .Get "title" | .Get "alt" | if }} alt="{{ with .Get "alt"}}{{.}}{{else}}{{.Get "title"}}{{end}}"{{ end }}

If a closing shortcode is used, the variable .Inner will be populated with all of the content between the opening and closing shortcodes. If a closing shortcode is required, you can check the length of .Inner and provide a warning to the user.

The variable .Params contains the list of parameters in case you need to do more complicated things than .Get.

You can also use the variable .Page to access all the normal Page Variables.

Single Positional Example: youtube

{{</* youtube 09jf3ow9jfw */>}}

Would load the template /layouts/shortcodes/youtube.html

<div class="embed video-player">
<iframe class="youtube-player" type="text/html" width="640" height="385" src="http://www.youtube.com/embed/{{ index .Params 0 }}" allowfullscreen frameborder="0">
</iframe>
</div>

This would be rendered as:

<div class="embed video-player">
<iframe class="youtube-player" type="text/html"
    width="640" height="385"
    src="http://www.youtube.com/embed/09jf3ow9jfw"
    allowfullscreen frameborder="0">
</iframe>
</div>

Single Named Example: image with caption

{{</* img src="/media/spf13.jpg" title="Steve Francia" */>}}

Would load the template /layouts/shortcodes/img.html

<!-- image -->
<figure {{ with .Get "class" }}class="{{.}}"{{ end }}>
    {{ with .Get "link"}}<a href="{{.}}">{{ end }}
        <img src="{{ .Get "src" }}" {{ if or (.Get "alt") (.Get "caption") }}alt="{{ with .Get "alt"}}{{.}}{{else}}{{ .Get "caption" }}{{ end }}"{{ end }} />
    {{ if .Get "link"}}</a>{{ end }}
    {{ if or (or (.Get "title") (.Get "caption")) (.Get "attr")}}
    <figcaption>{{ if isset .Params "title" }}
        <h4>{{ .Get "title" }}</h4>{{ end }}
        {{ if or (.Get "caption") (.Get "attr")}}<p>
        {{ .Get "caption" }}
        {{ with .Get "attrlink"}}<a href="{{.}}"> {{ end }}
            {{ .Get "attr" }}
        {{ if .Get "attrlink"}}</a> {{ end }}
        </p> {{ end }}
    </figcaption>
    {{ end }}
</figure>
<!-- image -->

Would be rendered as:

<figure >
    <img src="/media/spf13.jpg"  />
    <figcaption>
        <h4>Steve Francia</h4>
    </figcaption>
</figure>

Paired Example: Highlight

Hugo already ships with the highlight shortcode

{{</* highlight html */>}}
<html>
    <body> This HTML </body>
</html>
{{</* /highlight */>}}

The template for this utilizes the following code (already include in Hugo)

{{ .Get 0 | highlight .Inner  }}

And will be rendered as:

<div class="highlight" style="background: #272822"><pre style="line-height: 125%"><span style="color: #f92672">&lt;html&gt;</span>
    <span style="color: #f92672">&lt;body&gt;</span> This HTML <span style="color: #f92672">&lt;/body&gt;</span>
<span style="color: #f92672">&lt;/html&gt;</span>
</pre></div>

Please notice that this template makes use of a Hugo-specific template function called highlight which uses Pygments to add the highlighting code.

More shortcode examples can be found at spf13.com.