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Jekyll Minibundle plugin

A minimalistic plugin for bundling assets to Jekyll's site generation directory.

In addition to the plugin itself, you only need your asset bundling tool of choice. The plugin needs no other configuration than setting an environment variable. There are no gem dependencies.

Tested with Ruby MRI 1.9.3. Ruby 1.8 is not supported.

Build Status


There are two features: asset stamping with MD5 digest over the contents of the asset, and asset bundling combined with the first feature.

You still need a separate bundling tool, such as UglifyJS2 to do the actual work of bundling (concatenation, minification). There are no other dependencies.

Why is this good? Well, a unique content specific identifier in asset filename is the best way to handle web caching, because you can allow caching the asset for forever. Calculating MD5 digest over the contents of the asset is fast and the resulting digest is reasonably unique to be generated automatically.

Asset bundling is good for reducing the number of requests to server upon page load. It also allows minification for stylesheets and JavaScript sources, which makes asset sizes smaller and thus faster to load over network.


The plugin is shipped as a RubyGem:

gem install jekyll-minibundle

Add file _plugins/minibundle.rb to your Jekyll site project with this line:

require 'jekyll/minibundle'

Asset stamping

Asset stamping is intended to be used together with Compass and other similar asset generation tools where you do not want to include unprocessed input assets in the generated site.

Configure Compass to take inputs from _assets/styles/*.scss and to put output to _tmp/site.css. Use ministamp tag to copy the processed style asset to the generated site:

<link href="{% ministamp _tmp/site.css assets/site.css %}" rel="stylesheet" media="screen, projection">

Output, containing the MD5 digest in the filename:

<link href="assets/site-390be921ee0eff063817bb5ef2954300.css" rel="stylesheet" media="screen, projection">

This feature does not require any external tools.

Asset bundling

A straightforward way to bundle assets with any tool that supports reading input files from STDIN and writing the output to STDOUT. The bundled file has MD5 digest in the filename.

Place minibundle block with configuration to your content file where you want the generated markup to appear. For example, for bundling JavaScript sources:

{% minibundle js %}
source_dir: _assets/scripts
destination_path: assets/site
  - dependency
  - app
  id: my-scripts
{% endminibundle %}

Then, specify the command for launching your favorite bundling tool in $JEKYLL_MINIBUNDLE_CMD_JS environment variable. For example, when launching Jekyll:

$ JEKYLL_MINIBUNDLE_CMD_JS="./node_modules/.bin/uglifyjs --" jekyll

You can pass custom attributes to the generated markup with attributes map in the configuration.


<script src="assets/site-8e764372a0dbd296033cb2a416f064b5.js" type="text/javascript" id="my-scripts"></script>

For bundling CSS assets, you use css as the argument to minibundle block:

{% minibundle css %}
source_dir: _assets/styles
destination_path: assets/site
  - reset
  - common
  media: screen
{% endminibundle %}

And then specify the command for launching bundling in $JEKYLL_MINIBUNDLE_CMD_CSS environment variable.

Example site

See the contents of test/fixture/site directory.


MIT. See License.txt.

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