published on 22.08.2020

Tags in Hugo is a default taxonomy and we don’t need any special configuration to use tags. We just enter the tags in the post’s front-matter. This can be YAML, TOML, or JSON. I’m using the YAML format, just a personal preference.

tags: ["hugo", "tags"]

In this example, Hugo will create tags/hugo and tags/tags pages for us. These pages are called term pages and the /tags is a taxonomy page. If you want to change these pages you need to create templates: /layouts/tags/list.html for tags page and /layouts/tags/term.html term pages. I write a bit about Hugo templates in and this post and this post. This is a different topic.

Render Tags

In this post, I’ll explain “how to get tags of specific pages” and “how to generate tag cloud”. To achieve the first one, I’ve created a partial called get_tags.html. After that, you can use it where ever you want.

{{ with .Param "tags" }}
  {{ range $index, $tag := (. | sort) }} 
  {{ with $.Site.GetPage (printf "/%s/%s" "tags" $tag) }}
    <a href="{{ .Permalink }}">#{{ $tag | urlize }}</a>
  {{ end }}
  {{ end }}
{{ end }}

This code gets the tags from the page’s front-matter. Sorts them alphabetically then returns HTML links. I also added the hash “#” symbol at the beginning of the tag, and the styling will come from the CSS.

To create a tag-cloud I’ve found two solutions online, both works. The first one is the one I’m using, will create a tag-cloud using relatively bigger font sizes for more frequent tags. The other is more simple, it’ll just gather all tags, all with the same font-size.

<div class="container tagcloud">
    {{ if ne (len $.Site.Taxonomies.tags) 0 }}
      {{ $largestFontSize := 1.4 }}
      {{ $smallestFontSize := 1.0 }}
      {{ $fontSpread := sub $largestFontSize $smallestFontSize }}
      {{ $max := add (len (index $.Site.Taxonomies.tags.ByCount 0).Pages) 1 }}
      {{ $min := len (index $.Site.Taxonomies.tags.ByCount.Reverse 0).Pages }}
      {{ $spread := sub $max $min }}
      {{ $fontStep := div $fontSpread $spread }}
        {{ range $name, $taxonomy := $.Site.Taxonomies.tags }}
          {{ $tagCount := len $taxonomy.Pages }}
          {{ $currentFontSize := (add $smallestFontSize (mul (sub $tagCount $min) $fontStep) ) }}
          {{ $weigth := div (sub (math.Log $tagCount) (math.Log $min)) (sub (math.Log $max) (math.Log $min)) }}
          {{ $currentFontSize := (add $smallestFontSize (mul (sub $largestFontSize $smallestFontSize) $weigth)) }}
            <a href="{{ "/tags/" | relURL }}{{ $name | urlize }}" 
            class="tagcloud-item" style="font-size: {{ $currentFontSize }}rem;">
              {{ $name }}<sup>{{ $tagCount }}</sup>
            </a>
        {{ end }}
    {{ end }}
</div>

I’ve changed the code a little and colorized each item using a little sass, you can see the result at Tags.

Happy tweaking!

You are reading the 8th of 19 episodes in Hugo.
Published on 22.08.2020 by Mert Bakır with commit 261e231.
hugo
#hugo #static-site #tags
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Last Modified Date in Hugo
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