webassets-debug-filter.py

class DebugLevelFilter(Filter):
    max_debug_level = None

    def __init__(self, required_level):
        super(DebugLevelFilter, self).__init__()
        self.required_level = required_level

    def input(self, in_, out, **kw):
        if self.required_level == self.env.debug:
            out.write(in_.read())
        else:
            skip_msg = '/* Skipped {} because of debug level */'.format(os.path.basename(kw['source_path']))
            out.write(skip_msg)