Liquid Tags

All of the standard Liquid tags are supported. Bridgetown has a few built in tags to help you build your site. You can also create your own tags using plugins.

Component rendering

You can use the render and rendercontent tags to embed content and template partials into your main templates. Read the documentation here.

Find tag

New in Bridgetown 0.17, you can now use the find tag to loop through a data object or collection and pull out one or more items to use in your Liquid template. Whereas before you could use the where_exp filter to accomplish a similar purpose, this tag is more succinct and has support for single item variables.

The syntax of the tag is as follows:

# Single item:

{% find [item] in [array/collection], [expressions] %}

# Multiple items:

{% find [items] where [array/collection], [expressions] %}

For example, to find a single entry in the albums collection and assign it to the variable album:

{% find album in site.albums, band ==, year >= 1980, categories contains "Rock" %}

Or to find multiple items and assign that array to the variable albums:

{% find albums where site.albums, band ==, year >= 1980, categories contains "Rock" %}

Each expression (separated by a comma) adds an “AND” clause to the conditional logic. If you need OR logic instead, you can still use the where_exp filter, or you can write additional find tags and concat the arrays together (you’ll probably also want to use the uniq filter to ensure you don’t end up with duplicates).

{% find rock_albums where site.albums, band ==, year >= 1980, categories contains "Rock" %}
{% find folk_albums where site.albums, band ==, year >= 1980, categories contains "Folk" %}

{% assign albums = rock_albums | concat: folk_albums | uniq %}

Class Map tag

If you’ve ever had to write a bunch of conditional code and variable assigns to toggle on/off CSS classes based on input variables, you know it can get pretty messy.

But not anymore! Introducing class_map:

<div class="{% class_map has-centered-text: page.centered, is-small: small-var %}">

In this example, the class_map tag will include has-text-centered only if page.centered is truthy, and likewise is-small only if small-var is truthy. If you need to run a comparison with a specific value, you’ll still need to use assign but it’ll still be simpler than in the past:

{% if product.feature_in == "socks" %}{% assign should_bold = true %}{% endif %}
<div class="{% class_map product: true, bold-text: should_bold, float-right: true %}">

Code snippet highlighting

Bridgetown has built in support for syntax highlighting of over 100 languages thanks to Rouge. To render a code block with syntax highlighting, surround your code as follows:

{% highlight ruby %}
def foo
  puts 'foo'
{% endhighlight %}

The argument to the highlight tag (ruby in the example above) is the language identifier. To find the appropriate identifier to use for the language you want to highlight, look for the “short name” on the Rouge wiki.

Line numbers

There is a second argument to highlight called linenos that is optional. Including the linenos argument will force the highlighted code to include line numbers. For instance, the following code block would include line numbers next to each line:

{% highlight ruby linenos %}
def foo
  puts 'foo'
{% endhighlight %}

Stylesheets for syntax highlighting

In order for the highlighting to show up, you’ll need to include a highlighting stylesheet. You can use CSS that’s compatible with Pygments—example gallery here or from its repository.

Copy the CSS file (native.css for example) into your styles directory and import the syntax highlighter styles into your index.scss:

@import "native.css";

To link to a post, a page, collection item, or file, the link tag will generate the correct permalink URL for the path you specify. For example, if you use the link tag to link to mypage.html, even if you change your permalink style to include the file extension or omit it, the URL formed by the link tag will always be valid.

You must include the file’s original extension when using the link tag. Here are some examples:

{% link _collection/ %}
{% link _posts/ %}
{% link news/index.html %}
{% link /assets/files/doc.pdf %}

You can also use the link tag to create a link in Markdown as follows:

[Link to a document]({% link _collection/ %})
[Link to a post]({% link _posts/ %})
[Link to a page]({% link news/index.html %})
[Link to a file]({% link /assets/files/doc.pdf %})

The path to the post, page, or collection is defined as the path relative to the root directory (where your config file is) to the file, not the path from your existing page to the other page.

For example, suppose you’re creating a link in (stored in pages/folder1/folder2) to (stored in pages/folder1). Your path in the link would not be ../page_b.html. Instead, it would be /pages/folder1/

If you’re unsure of the path, add {{ page.path }} to the page and it will display the path.

One major benefit of using the link or post_url tag is link validation. If the link doesn’t exist, Bridgetown won’t build your site. This is a good thing, as it will alert you to a broken link so you can fix it (rather than allowing you to build and deploy a site with broken links).

Note you cannot add filters to link tags. For example, you cannot append a string using Liquid filters, such as {% link mypage.html | append: "#section1" %}. To link to sections on a page, you will need to use regular HTML or Markdown linking techniques.

Linking to posts

If you want to include a link to a post on your site, the post_url tag will generate the correct permalink URL for the post you specify.

{% post_url 2010-07-21-name-of-post %}

If you organize your posts in subdirectories, you need to include subdirectory path to the post:

{% post_url /subdir/2010-07-21-name-of-post %}

There is no need to include the file extension when using the post_url tag.

You can also use this tag to create a link to a post in Markdown as follows:

[Name of Link]({% post_url 2010-07-21-name-of-post %})

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