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Plugin Information


A small plugin for Jekyll to easily bundle and compress site assets


Jekyll Asset Bundler

Jekyll Asset Bundler is a Jekyll plugin for... bundling assets.
It is hacked onto... I mean, utilizes deep integration with Jekyll
for a seamless deployment experience.


Copy or link asset_bundler.rb into your _plugins folder
for your Jekyll project.

If your Jekyll project is in a git repository, you can easily
manage your plugins by utilizing git submodules.

To install this plugin as a git submodule:

git submodule add git://github.com/moshen/jekyll-asset_bundler.git _plugins/asset_bundler

To update:

cd _plugins/asset_bundler
git pull origin master


Currently only supports absolute asset paths in relation to your
source directory. For example: /css/mystyle.css looks for a file
in my_source_dir/css/mystyle.css.


  • Works with Octopress
  • Custom commands for bundle compression
  • Compressed bundle caching
  • Bundling and caching of remote assets
  • Dev mode, for easy site development with all assets
  • Dev-only asset inclusion


  • Relative paths support
  • CoffeeScript and LessCSS compilation support


v0.05 - Changed from using Liquid::Tags to Liquid::Blocks.
This will break on existing bundle markup if you upgrade.

Why change it? Well, Liquid::Tags have to be on one line,
whereas Liquid::Blocks do not, also it opens up some more
flexibility, as additional options could be included in the
tag text.

v0.08 - Changed the cdn config parameter to server_url in order to be
more generic. For the time being, cdn still works (see below).

Why change it? There seemed to be a little confusion about the parameter name
and what the parameter does.

v0.11 - jekyll --watch now turns on dev mode. Removed code for
compatibility with versions of Jekyll pre 1.0.

Why change it? jekyll --watch isn't really supported by the plugin anyway.
Also, Jekyll is changing and I don't want this to be any more of an
unmaintainable mess.

Is it production ready?

Consider this beta software, though for small Jekyll sites you
should have no problem using it.


Once installed in your _plugins folder Jekyll Asset Bundler provides
Liquid::Blocks to use which will generate the appropriate
markup for including JavaScript and CSS.
Each of the following blocks consumes a YAML
formatted array.



{% bundle %} [/js/main.js, /js/somethingelse.js] {% endbundle %}

Is equal to:

{% bundle %}
- /js/main.js
- /js/somethingelse.js
{% endbundle %}

Remote assets can also be bundled:

{% bundle %}
- http://cdnjs.cloudflare.com/ajax/libs/jquery/1.7.2/jquery.min.js
- //cdnjs.cloudflare.com/ajax/libs/underscore.js/1.3.1/underscore-min.js
- https://cdnjs.cloudflare.com/ajax/libs/backbone.js/0.9.2/backbone-min.js
- /js/my_local_javascript.js
{% endbundle %}

Remote assets will be cached in the _asset_bundler_cache folder
(in the same directory as your _plugins folder). If you want to
regenerate cached items, delete the cache folder.

The bundle tag will concatenate the provided scripts and make a hash of
the result. This hash is used as a filename. The Bundle is then compressed
(if desired), and the final result cached in the _asset_bundler_cache folder.
Therefore, the bundle is only recreated and compressed again if the source
files have been modified. This greatly speeds up future site builds.

Note: Asset Bundler makes no attempt to clean up the cache folder. If it
has grown too large, simply delete it.

The proper markup is finally inserted to include your bundle file.


{% bundle_glob %}
- /js/*.js
- /css/*.css
{% endbundle_glob %}

The bundle_glob tag uses the
Ruby Dir.glob
method to include multiple assets.
WARNING: assets will be included in alphanumeric order,
this may screw something up.


{% dev_assets %}
- /js/less.js
{% enddev_assets %}

The dev_assets tag includes the normal markup for the referenced
assets only in 'dev mode'. The array items can either be local files
or urls for external scripts and are included as-is.
At any other time, it does nothing.
In a future version (hopefully soon), this will play a role in
utilizing things like LessCSS and CoffeeScript.


Some behavior can be modified with settings in your _config.yml. The
following represents the default configuration:

    js: false
    css: false
  base_path: /bundles/
  remove_bundled: false
  dev: false
  bundle_name: false
    js: "<script type='text/javascript' src='{{url}}'></script>\n"
    css: "<link rel='stylesheet' type='text/css' href='{{url}}' />\n"

Here is a breakdown of each configuration option under the top level
asset_bundler key.


Compresses nothing by default. Change the js and css keys to
modify compression behavior.


To compress with the yui-compressor gem, use 'yui' here,
to compress with the closure compiler gem, use 'closure' here.

  js: yui

To compress with a system command, enter it for the
appropriate asset type:

  js: uglifyjs :infile -o :outfile -c

This example will run a uglifyjs command from your PATH
while substituting :outfile and :infile for temporary files
stored in _asset_bundler_cache.

If either :outfile or :infile are omitted, stdout and
stdin will be used. WARNING, stdin and stdout are done
with IO.popen , which doesn't work on Windows

Note: Some have reported other issues when using the yui-compressor or
closure compiler gems on Windows. If you having trouble on windows, try
specifying a command as outlined above.


Takes the exact same arguments as js:, with the exception
of the Google Closure Compiler ( it's JavaScript only ).


Where the bundles will be copied within your destination

Default: /bundles/.


NOTE: In v0.07 and earlier this setting was cdn. The cdn key still
works and will act as an alias. However, if the server_url key is set, it
will override cdn.

The root path of your server_url or CDN (if you use one).
For example: http://my-cdn.cloudfront.net/

Jekyll Asset Bundler checks to make sure that this setting ends in a slash.

Default: (blank).


If set to true, will remove the files included in your
bundles from the destination folder.

Default: false.


NOTE: In v0.10 and earlier, dev mode was not enabled automatically for
--auto or --watch mode.

If set to true, enables dev mode. When dev mode is active,
no bundles are created and all the referenced files are
included individually without modification.

Dev mode is also automatically enabled when using
jekyll server, jekyll --watch or when a top level configuration key: dev
is set to true.

Default: false.


Overrides bundle name. When false, MD5 hash of the content is used instead.

Default: false.


Use the relevant markup_template options to override the default templates
for inserting bundles. Each option is parsed with Liquid::Template.parse
and passed a url (String) parameter.

Note: if you want newlines to be passed in properly, be sure to quote your
templates in _config.yml.


The default JavaScript markup is fairly verbose. If you would like a modern
replacement, try "<script src='{{url}}'></script>\n".

Default: "<script type='text/javascript' src='{{url}}'></script>\n"


The default CSS is also verbose. If you would like a modern
replacement, try "<link rel=stylesheet href='{{url}}'>\n".

Default: "<link rel='stylesheet' type='text/css' href='{{url}}' />\n"


Jekyll Asset Bundler uses the
yui-compressor or
closure-compiler gems
(when configured) and (obviously)


Colin Kennedy, moshen on GitHub


see LICENSE file.