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A django-compressor filter to compile SASS files using libsass

Project description

A django-compressor filter to compile Sass files using libsass.


Starting from a Django project with django-compressor set up:

pip install django-libsass

and add django_libsass.SassCompiler to your COMPRESS_PRECOMPILERS setting:

    ('text/x-scss', 'django_libsass.SassCompiler'),

You can now use the content type text/x-scss on your stylesheets, and have them compiled seamlessly into CSS:

{% compress css %}
    <link rel="stylesheet" type="text/x-scss" href="{% static "myapp/css/main.scss" %}" />
{% endcompress %}


Relative paths in @import lines are followed as you would expect:

@import "../variables.scss";

Additionally, Django’s STATICFILES_FINDERS setting is consulted, and all possible locations for static files on the local filesystem are included on the search path. This makes it possible to import files across different apps:

@import "myotherapp/css/widget.scss"

Why django-libsass?

We wanted to use Sass in a Django project without introducing any external (non pip-installable) dependencies. (Actually, we wanted to use Less, but the same arguments apply…) There are a few pure Python implementations of Sass and Less, but we found that they invariably didn’t match the behaviour of the reference compilers, either in their handling of @imports or lesser-used CSS features such as media queries.

libsass is a mature C/C++ port of the Sass engine, co-developed by the original creator of Sass, and we can reasonably rely on it to stay in sync with the reference Sass compiler - and, being C/C++, it’s fast. Thanks to Hong Minhee’s libsass-python project, it has Python bindings and installs straight from pip.

django-libsass builds on libsass-python to make @import paths aware of Django’s staticfiles mechanism, and provides a filter module for django-compressor which uses the libsass-python API directly, avoiding the overheads of calling an external executable to do the compilation.


Matt Westcott

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