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71 lines
2.3 KiB
Python
71 lines
2.3 KiB
Python
"""
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Neighbor Articles Plugin for Pelican
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====================================
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This plugin adds ``next_article`` (newer) and ``prev_article`` (older)
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variables to the article's context
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"""
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from pelican import signals
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def iter3(seq):
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"""Generate one triplet per element in 'seq' following PEP-479."""
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nxt, cur = None, None
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for prv in seq:
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if cur:
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yield nxt, cur, prv
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nxt, cur = cur, prv
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# Don't yield anything if empty seq
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if cur:
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# Yield last element in seq (also if len(seq) == 1)
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yield nxt, cur, None
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def get_translation(article, prefered_language):
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if not article:
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return None
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for translation in article.translations:
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if translation.lang == prefered_language:
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return translation
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return article
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def set_neighbors(articles, next_name, prev_name):
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for nxt, cur, prv in iter3(articles):
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setattr(cur, next_name, nxt)
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setattr(cur, prev_name, prv)
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for translation in cur.translations:
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setattr(translation, next_name, get_translation(nxt, translation.lang))
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setattr(translation, prev_name, get_translation(prv, translation.lang))
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def neighbors(generator):
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set_neighbors(generator.articles, "next_article", "prev_article")
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for category, articles in generator.categories:
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articles.sort(key=lambda x: x.date, reverse=True)
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set_neighbors(articles, "next_article_in_category", "prev_article_in_category")
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# support for the More Categories plugin
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for category, articles in generator.categories:
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articles.sort(key=lambda x: x.date, reverse=True)
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index = category.name.count("/")
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next_name = f"next_article_in_subcategory{index}"
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prev_name = f"prev_article_in_subcategory{index}"
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set_neighbors(articles, next_name, prev_name)
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# support for the Subcategory Plugin
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if hasattr(generator, "subcategories"):
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for subcategory, articles in generator.subcategories:
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articles.sort(key=lambda x: x.date, reverse=True)
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index = subcategory.name.count("/")
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next_name = f"next_article_in_subcategory{index}"
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prev_name = f"prev_article_in_subcategory{index}"
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set_neighbors(articles, next_name, prev_name)
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def register():
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signals.article_generator_finalized.connect(neighbors)
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