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from pelican import signals
def set_category_order(generator):
CATEGORY_ORDER = generator.settings.get('CATEGORY_ORDER', [])
categories = generator.context.get('categories', [])
# categories is a list op tuples, in format (Category, [<Article>])
generator.context['categories'] = sorted(categories, key=lambda entry: CATEGORY_ORDER.index(entry[0].slug))
def register():
signals.article_generator_finalized.connect(set_category_order)