Adding an alert on old posts with hugo

Very short post today, more as a side note for my future self. To add a message on old message, the minimal basic to add in the template is:

{{ $ageDays := div (sub now.Unix .Date.Unix) 86400 }}

{{ if gt $ageDays 365 }}
    Warning: This post is older than 365 days, the information may not be relevant anymore.
{{ end }}

Code is self explanatory, ageDay store the number of days between now and the post and is then compared to 365 in this example.

To add this to MinIndie, a minimal indieweb ready hugo theme, I added in _default/single.html the following:

<div class="e-content">
    {{- with .Site.Params.tagPostOlderThanXDays -}}
        {{- if gt $ageDays . -}}
            {{ partial "article-old-content.html" . }}
        {{- end -}}
    {{- end -}}
    {{ .Content }}
</div>

The article-old-content.html partial contains:

<div class="alert">
    <strong>/!\ Warning: This article is older than {{ . }} days, make sure the content is still relevant!</strong>
</div>

To enable this feature, the config.toml must contains a Params.tagPostOlderThanXDays, for example:

# Parameters
[params]
  […]
  tagPostOlderThanXDays = 555
  […]

With this, a message is now displayed on old post and it looks like this:

And voilà, thanks to this post for the inspiration :)