Link render hooks

Markdown

A Markdown link has three components: the link text, the link destination, and optionally the link title.

[Post 1](/posts/post-1 "My first post")
 ------  -------------  -------------
  text    destination       title

These components are passed into the render hook context as shown below.

Context

Link render hook templates receive the following context:

Destination

(string) The link destination.

Page

(page) A reference to the page containing the link.

PlainText

(string) The link description as plain text.

Text

(string) The link description.

Title

(string) The link title.

Examples

In its default configuration, Hugo renders Markdown links according to the CommonMark specification. To create a render hook that does the same thing:

<a href="{{ .Destination | safeURL }}"
  {{- with .Title }} title="{{ . }}"{{ end -}}
>
  {{- with .Text | safeHTML }}{{ . }}{{ end -}}
</a>
{{- /* chomp trailing newline */ -}}

To include a rel attribute set to external for external links:

{{- $u := urls.Parse .Destination -}}
<a href="{{ .Destination | safeURL }}"
  {{- with .Title }} title="{{ . }}"{{ end -}}
  {{- if $u.IsAbs }} rel="external"{{ end -}}
>
  {{- with .Text | safeHTML }}{{ . }}{{ end -}}
</a>
{{- /* chomp trailing newline */ -}}

Default

Hugo includes an embedded link render hook to resolve Markdown link destinations. Disabled by default, you can enable it in your site configuration:

markup:
  goldmark:
    renderHooks:
      link:
        enableDefault: true

[markup]
  [markup.goldmark]
    [markup.goldmark.renderHooks]
      [markup.goldmark.renderHooks.link]
        enableDefault = true

{
   "markup": {
      "goldmark": {
         "renderHooks": {
            "link": {
               "enableDefault": true
            }
         }
      }
   }
}

A custom render hook, even when provided by a theme or module, will override the embedded render hook regardless of the configuration setting above.

The embedded link render hook resolves internal Markdown destinations by looking for a matching page, falling back to a matching page resource, then falling back to a matching global resource. Remote destinations are passed through, and the render hook will not throw an error or warning if it is unable to resolve a destination.

You must place global resources in the assets directory. If you have placed your resources in the static directory, and you are unable or unwilling to move them, you must mount the static directory to the assets directory by including both of these entries in your site configuration:

module:
  mounts:
  - source: assets
    target: assets
  - source: static
    target: assets

[module]
[[module.mounts]]
    source = 'assets'
    target = 'assets'
[[module.mounts]]
    source = 'static'
    target = 'assets'

{
   "module": {
      "mounts": [
         {
            "source": "assets",
            "target": "assets"
         },
         {
            "source": "static",
            "target": "assets"
         }
      ]
   }
}