web/_includes/related-posts.html

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<!--
Recommend the other 3 posts according to the tags and categories of the current post,
if the number is not enough, use the other latest posts to supplement.
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v2.0
https://github.com/cotes2020/jekyll-theme-chirpy
© 2019 Cotes Chung
Published under the MIT License
-->
<!-- 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 score_list = "" | split: "" %}
{% assign last_index = site.posts.size | minus: 1 %}
{% for i in (0..last_index) %}
{% assign post = site.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 %}
<!-- Fill with the other newlest posts -->
{% assign less = TOTAL_SIZE | minus: index_list.size %}
{% if less > 0 %}
{% for i in (0..last_index) %}
{% assign post = site.posts[i] %}
{% if post.url != page.url %}
{% capture cur_index %}{{ i }}{% endcapture %}
{% unless index_list contains cur_index %}
{% assign index_list = index_list | push: cur_index %}
{% assign less = less | minus: 1 %}
{% if less <= 0 %}
{% break %}
{% endif %}
{% endunless %}
{% endif %}
{% endfor %}
{% endif %}
{% if index_list.size > 0 %}
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<div id="related-posts" class="mt-5 mb-2 mb-sm-4">
<h3 class="pt-2 mt-1 mb-4 ml-1" data-toc-skip>{{ site.data.label.post.relate_posts }}</h3>
<div class="card-deck mb-4">
{% for entry in index_list %}
{% assign index = entry | plus: 0 %}
{% assign post = site.posts[index] %}
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<div class="card">
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<a href="{{ post.url | relative_url }}">
<div class="card-body">
{% include timeago.html date=post.date class="small" %}
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<h3 class="pt-0 mt-1 mb-3" data-toc-skip>{{ post.title }}</h3>
<div class="text-muted small">
<p>
{% include no-linenos.html content=post.content %}
{{ content | markdownify | strip_html | truncate: 200 }}
</p>
</div>
</div>
</a>
</div>
{% endfor %}
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</div> <!-- .card-deck -->
</div> <!-- #related-posts -->
{% endif %}