from __future__ import absolute_import from webassets.filter import Filter __all__ = ('CSSMin',) class CSSMin(Filter): """Minifies CSS. Requires the ``cssmin`` package (http://github.com/zacharyvoase/cssmin), which is a port of the YUI CSS compression algorithm. """ name = 'cssmin' def setup(self): try: import cssmin except ImportError: raise EnvironmentError('The "cssmin" package is not installed.') else: self.cssmin = cssmin def output(self, _in, out, **kw): out.write(self.cssmin.cssmin(_in.read()))