Backlinks creating infinite recursion error?

support
1

I modified this backlinks code from Wouter Groeneveld’s site Brain Baking to have a list of pages that link to the current page.

Link to GitHub Repository of Site

{{ $currRellink := substr .RelPermalink 0 }}
{{ $currRellink := printf `"%s"` $currRellink }} <!-- adds quotes around outside to prevent finding common words as links like about -->
{{ $currContent := .Content }}
{{ $backlinks := slice }}
{{ $forwardlinks := slice }}

{{ $pages := .Site.RegularPages}}
{{ range $pages }}
    {{ $currPagelink := substr .RelPermalink 0 }} <!-- Get link of page -->
    {{ $found := findRE $currRellink .Content 1 }}
    {{ $foundCourses := findRE `courses` $currPagelink }}<!-- Check if link of page has "courses "-->
        {{ if and (not $foundCourses) $found}} <!-- only append if backlink doesn't come from courses -->
            {{ $backlinks = $backlinks | append . }}
        {{ else }}
            {{ $rellink := substr .RelPermalink 0 }}
            {{ $rellink := printf `"%s"` $rellink }} <!-- adds quotes around outside to prevent finding common links like about -->
            {{ $found = findRE $rellink $currContent 1 }}
        {{ if $found }}
            {{ $forwardlinks = $forwardlinks | append . }}
        {{ end }}
    {{ end }}
{{ end }}

{{ $related := append $backlinks $forwardlinks }}

<!-- Modified from https://brainbaking.com/post/2022/04/true-backlink-support-in-hugo/ -->

<hr>
{{ if gt (len $backlinks) 0 }}
<div class="bl-section">
    <h4>Links to this note</h4>
    <div class="backlinks">
        <ul>
            {{ range $backlinks | first 10}}
            <li>
                <a href="{{ .RelPermalink }}">{{ .Title }}</a>
            </li>
            {{ end }}
        </ul>
    </div>
</div>
{{ else }}
<div class="bl-section">
    <h4 class="small text-muted font-weight-light">No notes link to this note</h4>
</div>

{{ end }}

<hr>
{{ if gt (len $forwardlinks) 0 }}
<div class="bl-section">
    <h4>This note links to</h4>
    <div class="backlinks">
        <ul>
            {{ range $forwardlinks | first 10}}
            <li><a href="{{ .RelPermalink }}">{{ .Title }}</a></li>
            {{ end }}
        </ul>
    </div>
</div>
{{ else }}
<div class="bl-section">
    <h4 class="small text-muted font-weight-light">This note does not link to other notes</h4>
</div>

{{ end }}

It give this error code sometimes when building on GitHub Pages but not always. It also stopped making any backlinks, although it did before.

Error: error building site: render: failed to render pages: render of "page" failed: "/home/runner/work/whatmakeart.github.io/whatmakeart.github.io/themes/basicTheme/layouts/_default/single.html:68:15": execute of template failed: template: _default/single.html:68:15: executing "main" at <partial "backlinks.html" .>: error calling partial: partial "backlinks.html" timed out after 30s. This is most likely due to infinite recursion. If this is just a slow template, you can try to increase the 'timeout' config setting.

Is there something obvious that is causing the infinite recursion? I am not sure why it is not listing any forward or backlinks now.

I think it is likely due to the content includes I have in the render-image.html markdown render hook, although I tried to not parse the pages in the /courses/ directory and it still didn’t work. It could also be the code in the render-link.html that tries to search for links in a included markdown page so they work.

2

It turns out my render-link.html and my orginal modification of Wouter Groeneveld’s code was the problem.

The links produced from my render-link.html do not have a trailing / even though I tried to add a trailing / with {{ $link = path.Join $link "/" }} after using {{ $link = path.Clean $link }}

The original code from Wouter already had the solution that I previously removed to get working with my links at the time. The original backlinks code used substr to remove trailing / from the link search with {{ $currRellink := substr .RelPermalink 0 -1 }}

I added that back in and now the backlinks are working. The forward links are still not working but it is likely a similar fix.

Current backlinks working partial

{{ $currRellink := substr .RelPermalink 0 -1 }}<!-- needed for removing the trailing slash for search unless it can be added back in with path.Join -->
{{ $currRellink := printf `"%s"` $currRellink }} <!-- adds quotes around outside to prevent finding common words as links like about -->
{{ $currContent := .Content }}
{{ $backlinks := slice }}
{{ $forwardlinks := slice }}

{{ $pages := where .Site.RegularPages ".Section" "not in" (slice  "courses" ) }}<!-- regular non list pages not in section courses -->

{{ range $pages }}
    {{ $found := findRE $currRellink .Content 1 }}
        {{ if $found}} <!-- only append if backlink doesn't come from courses -->
            {{ $backlinks = $backlinks | append . }}
        {{ else }}
            {{ $rellink := substr .RelPermalink 0 -1}}<!-- needed for removing the trailing slash for search unless it can be added back in with path.Join -->
            {{ $rellink := printf `"%s"` $rellink }} <!-- adds quotes around outside to prevent finding common links like about -->
            {{ $found = findRE $rellink $currContent 1 }}
        {{ if $found }}
            {{ $forwardlinks = $forwardlinks | append . }}
        {{ end }}
    {{ end }}
{{ end }}

<!-- Modified from https://brainbaking.com/post/2022/04/true-backlink-support-in-hugo/ -->

<hr>
{{ if gt (len $backlinks) 0 }}
<div class="bl-section">
    <h4>Links to this note</h4>
    <div class="backlinks">
        <ul>
            {{ range $backlinks | first 10}}
            <li>
                <a href="{{ .RelPermalink }}">{{ .Title }}</a>
            </li>
            {{ end }}
        </ul>
    </div>
</div>
{{ else }}
<div class="bl-section">
    <h4 class="small text-muted font-weight-light">No notes link to this note</h4>
</div>

{{ end }}

<hr>
{{ if gt (len $forwardlinks) 0 }}
<div class="bl-section">
    <h4>This note links to</h4>
    <div class="backlinks">
        <ul>
            {{ range $forwardlinks | first 10}}
            <li><a href="{{ .RelPermalink }}">{{ .Title }}</a></li>
            {{ end }}
        </ul>
    </div>
</div>
{{ else }}
<div class="bl-section">
    <h4 class="small text-muted font-weight-light">This note does not link to other notes</h4>
</div>

{{ end }}
3

The forward links work on some pages but not others. This page has forward links and backlinks but this page should as well but only has backlinks.

---- Solution ----
The original code had an {{ else }} after the first if, I assume this want to prevent duplicate forward and backlinks but I wanted to get all the forward links as well even if they were also backlinks. Changing this to an {{ end }} and having a second if did the trick.

Current final Backlinks Partial

{{ $currRellink := substr .RelPermalink 0 -1 }}<!-- needed for removing the trailing slash for search unless it can be added back in with path.Join -->
{{ $currRellink := printf `"%s"` $currRellink }} <!-- adds quotes around outside to prevent finding common words as links like about -->
{{ $currContent := .Content }}
{{ $backlinks := slice }}
{{ $forwardlinks := slice }}

{{ $pages := where .Site.RegularPages ".Section" "not in" (slice  "courses" ) }}<!-- regular non list pages not in section courses -->

{{ range $pages }}
    {{ $found := findRE $currRellink .Content 1 }}
        {{ if $found}} <!-- only append if backlink doesn't come from courses -->
            {{ $backlinks = $backlinks | append . }}
        {{ end }} <!-- needs to be an end instead of an else to also get all forward links -->
            {{ $rellink := substr .RelPermalink 0 -1}}<!-- needed for removing the trailing slash for search unless it can be added back in with path.Join -->
            {{ $rellink := printf `"%s"` $rellink }} <!-- adds quotes around outside to prevent finding common links like about -->
            {{ $found := findRE $rellink $currContent 1 }}
        {{ if $found }}
            {{ $forwardlinks = $forwardlinks | append . }}
        {{ end }}
    {{ end }}

<!-- Modified from https://brainbaking.com/post/2022/04/true-backlink-support-in-hugo/ -->

<hr>
{{ if gt (len $backlinks) 0 }}
<div class="bl-section">
    <h4>Links to this note</h4>
    <div class="backlinks">
        <ul>
            {{ range $backlinks | first 10}}
            <li>
                <a href="{{ .RelPermalink }}">{{ .Title }}</a>
            </li>
            {{ end }}
        </ul>
    </div>
</div>
{{ else }}
<div class="bl-section">
    <h4 class="small text-muted font-weight-light">No notes link to this note</h4>
</div>

{{ end }}

<hr>
{{ if gt (len $forwardlinks) 0 }}
<div class="bl-section">
    <h4>This note links to</h4>
    <div class="backlinks">
        <ul>
            {{ range $forwardlinks | first 10}}
            <li><a href="{{ .RelPermalink }}">{{ .Title }}</a></li>
            {{ end }}
        </ul>
    </div>
</div>
{{ else }}
<div class="bl-section">
    <h4 class="small text-muted font-weight-light">This note does not link to other notes</h4>
</div>

{{ end }}
4

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