def METHOD_NAME(self, **options):
    self.force_compress = options.get('force', False)
    # This will loop through every bundle, and do the following:
    # - Concat all files into one
    # - Cache bust all images in CSS files
    # - Minify the concatted files
    for ftype, bundle in settings.MINIFY_BUNDLES.items():
        for name, files in bundle.items():
            # Set the paths to the files.
            concatted_file = os.path.join(
                settings.ROOT,
                'static',
                ftype,
                '%s-all.%s'
                % (
                    name,
                    ftype,
                ),
            )
            compressed_file = os.path.join(
                settings.ROOT,
                'static',
                ftype,
                '%s-min.%s'
                % (
                    name,
                    ftype,
                ),
            )
            ensure_path_exists(concatted_file)
            ensure_path_exists(compressed_file)
            files_all = []
            contents = []
            for filename in files:
                processed = self._preprocess_file(filename)
                # If the file can't be processed, we skip it.
                if processed is not None:
                    files_all.append(processed)
                with open(processed) as f:
                    contents.append(f.read())
            # Concat all the files.
            tmp_concatted = '%s.tmp' % concatted_file
            if len(files_all) == 0:
                raise CommandError(
                    'No input files specified in '
                    'MINIFY_BUNDLES["%s"]["%s"] in settings.py!' % (ftype, name)
                )
            with open(tmp_concatted, 'w') as f:
                f.write(''.join(contents))
            # Compresses the concatenations.
            is_changed = self._is_changed(concatted_file)
            self._clean_tmp(concatted_file)
            if is_changed or not os.path.isfile(compressed_file):
                self._minify(ftype, concatted_file, compressed_file)
            else:
                print(
                    'File unchanged, skipping minification of %s' % (concatted_file)
                )
                self.minify_skipped += 1
    if self.minify_skipped:
        print(
            'Unchanged files skipped for minification: %s' % (self.minify_skipped)
        )