This project is now DEPRECATED. Currently there are better alternatives, please use those in new projects.

Webassets CompassConnector

Seamless integration with Compass for Python3 apps.

For full blown experience you have to use webassets with patches from and . Especially if you're using Python3.3. Alternatively you can install webassets fork from (branch mymaster).

Using unpatched version can result in bad dependency traacking (parent asset may not compile even if child has changed).

What problems is it solving?

  • adds load_path namespace for compass files - so you can do cross app imports or use assets from other packages
  • you don't need already installed assets - connector uses files for you packages
  • assets recompiling/updating when any of its dependencies are modified - be it another import, inlined font file or just width: image-width(path/myimage.png);

How to install

  • firstly you need to install ruby connector gem:
gem install compass-connector
  • then install filter:
pip install webassets_compassconnector

Virtual Paths

There are three kind of "paths":

  • app, starts with an @ and may look like public/images/asset.png
  • vendor: a relative path, should be used only by compass plugins (eg. zurb-foundation, blueprint)
  • absolute path: starts with /, http:// etc. and will NOT be changed by connector

Some examples:

@import "@package/scss/settings"; /* will resolve to eg. .../package/scss/_settings.scss */
@import "foundation"; /* will include foundation scss from your compass instalation */

width: image-size("@package/public/images/my.png");
background-image: image-url("@package/public/images/my.png"); // will generate url with prefixes given by Webassets
@import "@package/sprites/*.png"; // will import sprites located in package/sprites/ (generated url will be with applied Webasset prefixes)


Standalone example:

from webassets import Environment, Bundle
from webassets_cc.filter import CompassConnectorFilter

env = Environment("/some/path/out", '/media-prefix')

env.config["compass_bin"] = "/path/to/compass/bin"
env.config["vendor_path"] = "vendor" #it is relative path prepended in vendor urls

#if using zurb_foundation python package
env.config["compass_imports"] = [pkg_resources.resource_filename("zurb_foundation", "scss")]
#if using zurb-foundation ruby package
env.config["compass_plugins"] = {"zurb-foundation":">4"}

env.append_path("/some/path/assets", "/")
env.append_path("/some/path/vendors", "/vendors")

scss = Bundle('scss/my.scss', filters=CompassConnectorFilter, output='my.css')

With Webassets, Pyramid and Jinja2:

config = Configurator()

config.add_settings({"webassets.base_dir": join(root_dir, "cache", "assets"),"webassets.base_url":"/static"})

config.add_route('show', '/')
config.add_static_view(name='static', path=join(root_dir, "cache", "assets"))

scss = Bundle('package:resources/assets/app.scss', filters=CompassConnectorFilter, output='app.css')
config.add_webasset('styles', scss)

assets_env = config.get_webassets_env()
assets_env.config["compass_bin"] = "/home/user/.gem/ruby/1.9.1/bin/compass"
assets_env.config["compass_plugins"] = {"zurb-foundation":">4"}
config.get_jinja2_environment().assets_environment = assets_env