web/_includes/related-posts.html

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<!-- Recommend the other 3 posts according to the tags and categories of the current post. -->
<!-- The total size of related posts -->
{% assign TOTAL_SIZE = 3 %}
<!-- An random integer that bigger than 0 -->
{% assign TAG_SCORE = 1 %}
<!-- Equals to TAG_SCORE / {max_categories_hierarchy} -->
{% assign CATEGORY_SCORE = 0.5 %}
{% assign SEPARATOR = ':' %}
{% assign match_posts = '' | split: '' %}
{% for category in page.categories %}
{% assign match_posts = match_posts | push: site.categories[category] | uniq %}
{% endfor %}
{% for tag in page.tags %}
{% assign match_posts = match_posts | push: site.tags[tag] | uniq %}
{% endfor %}
{% assign last_index = match_posts.size | minus: 1 %}
{% assign score_list = '' | split: '' %}
{% for i in (0..last_index) %}
{% assign post = match_posts[i] %}
{% if post.url == page.url %}
{% continue %}
{% endif %}
{% assign score = 0 %}
{% for tag in post.tags %}
{% if page.tags contains tag %}
{% assign score = score | plus: TAG_SCORE %}
{% endif %}
{% endfor %}
{% for category in post.categories %}
{% if page.categories contains category %}
{% assign score = score | plus: CATEGORY_SCORE %}
{% endif %}
{% endfor %}
{% if score > 0 %}
{% capture score_item %}{{ score }}{{ SEPARATOR }}{{ i }}{% endcapture %}
{% assign score_list = score_list | push: score_item %}
{% endif %}
{% endfor %}
{% assign index_list = '' | split: '' %}
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{% if score_list.size > 0 %}
{% assign score_list = score_list | sort | reverse %}
{% for entry in score_list limit: TOTAL_SIZE %}
{% assign index = entry | split: SEPARATOR | last %}
{% assign index_list = index_list | push: index %}
{% endfor %}
{% endif %}
{% assign relate_posts = '' | split: '' %}
{% for index in index_list %}
{% assign i = index | to_integer %}
{% assign relate_posts = relate_posts | push: match_posts[i] %}
{% endfor %}
{% if relate_posts.size > 0 %}
<aside id="related-posts" aria-labelledby="related-label">
<h3 class="mb-4" id="related-label">
{{- site.data.locales[include.lang].post.relate_posts -}}
</h3>
<nav class="row row-cols-1 row-cols-md-2 row-cols-xl-3 g-4 mb-4">
{% for post in relate_posts %}
<article class="col">
<a href="{{ post.url | relative_url }}" class="post-preview card h-100">
<div class="card-body">
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{% include datetime.html date=post.date lang=include.lang %}
<h4 class="pt-0 my-2">{{ post.title }}</h4>
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<div class="text-muted">
<p>
{% include no-linenos.html content=post.content %}
{{ content | markdownify | strip_html | truncate: 200 | escape }}
</p>
</div>
</div>
</a>
</article>
{% endfor %}
</nav>
</aside>
<!-- #related-posts -->
{% endif %}