Bundle generators for use with webassets

assets.py

from django.conf import settings
from django_assets import Bundle, register
from webassets.filter import get_filter

def js(name, *args, **kwargs):
    """
    Convenience helper for creating JavaScript bundles.

    Given a `name`, this function registers a bundle named `name +
    "_js"` with default filters. The output file will prefixed with
    the `ASSETS_OUTPUT_PREFIX`.
    """
    assert not name.endswith('.js'), 'first arg should be a bundle name'
    assert not name.endswith('_js'), '"_js" is automatically added to the bundle name'
    kwargs.setdefault('filters', 'jsmin')
    kwargs.setdefault('output', settings.ASSETS_OUTPUT_PREFIX + name + '.js')
    return register(name + '_js', Bundle(*args, **kwargs))

def css(name, *args, **kwargs):
    """
    Convenience helper for creating CSS bundles.

    Given a `name`, this function registers a bundle named `name +
    "_css"` with default filters. The output file will prefixed with
    the `ASSETS_OUTPUT_PREFIX`.

    Files ending in `.sass` will be converted to SASS bundles
    automatically, so you don't neeed to use the `sass()` function
    defined above.
    """
    assert not name.endswith('.css'), 'first arg should be a bundle name'
    assert not name.endswith('_css'), '"_css" is automatically added to the bundle name'
    kwargs.setdefault('filters', 'cssmin,cssrewrite')
    kwargs.setdefault('output', settings.ASSETS_OUTPUT_PREFIX + name + '.css')

    # Convert files ending in '.sass' to SASS bundles.
    sass_filter = get_filter('sass', debug_info=False)
    dest = settings.ASSETS_OUTPUT_PREFIX
    files = []
    for f in args:
        if f.endswith('.sass'):
            # We need a unique name for the bundle.
            path = f.replace('/', '__')
            files.append(Bundle(f, filters=(sass_filter, 'cssrewrite'),
                                debug=False,
                                output='%s%s__%s.src.css' % (dest, name, path)))
        else:
            files.append(f)

    return register(name + '_css', Bundle(*files, **kwargs))

# --------------------------------------------------

jquery = ('jquery15', 'third_party/jquery-1.5.js')

js('base', 'globals.js', jquery)
css('base', 'global.sass', 'buttons.sass', 'tooltips.sass', 'legacy.css')