Merge commit 'd276e901b36d2576ef8350ed96b17f66254eac1b'

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Bjørn Erik Pedersen
2022-03-26 11:04:57 +02:00
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## Markdown Render Hooks
{{< new-in "0.62.0" >}}
See [Markdown Render Hooks](/templates/render-hooks/).
Note that this is only supported with the [Goldmark](#goldmark) renderer.
Render Hooks allow custom templates to override markdown rendering functionality. You can do this by creating templates with base names `render-{feature}` in `layouts/_default/_markup`.
You can also create type/section specific hooks in `layouts/[type/section]/_markup`, e.g.: `layouts/blog/_markup`.{{< new-in "0.71.0" >}}
The features currently supported are:
* `image`
* `link`
* `heading` {{< new-in "0.71.0" >}}
You can define [Output-Format-](/templates/output-formats) and [language-](/content-management/multilingual/)specific templates if needed. Your `layouts` folder may look like this:
```bash
layouts
└── _default
└── _markup
├── render-image.html
├── render-image.rss.xml
└── render-link.html
```
Some use cases for the above:
* Resolve link references using `.GetPage`. This would make links portable as you could translate `./my-post.md` (and similar constructs that would work on GitHub) into `/blog/2019/01/01/my-post/` etc.
* Add `target=_blank` to external links.
* Resolve and [process](/content-management/image-processing/) images.
* Add [header links](https://remysharp.com/2014/08/08/automatic-permalinks-for-blog-posts).
### Render Hook Templates
The `render-link` and `render-image` templates will receive this context:
Page
: The [Page](/variables/page/) being rendered.
Destination
: The URL.
Title
: The title attribute.
Text
: The rendered (HTML) link text.
PlainText
: The plain variant of the above.
The `render-heading` template will receive this context:
Page
: The [Page](/variables/page/) being rendered.
Level
: The header level (1--6)
Anchor
: An auto-generated html id unique to the header within the page
Text
: The rendered (HTML) text.
PlainText
: The plain variant of the above.
Attributes (map) {{< new-in "0.82.0" >}}
: A map of attributes (e.g. `id`, `class`)
#### Link with title Markdown example:
```md
[Text](https://www.gohugo.io "Title")
```
Here is a code example for how the render-link.html template could look:
{{< code file="layouts/_default/_markup/render-link.html" >}}
<a href="{{ .Destination | safeURL }}"{{ with .Title}} title="{{ . }}"{{ end }}{{ if strings.HasPrefix .Destination "http" }} target="_blank" rel="noopener"{{ end }}>{{ .Text | safeHTML }}</a>
{{< /code >}}
#### Image Markdown example:
```md
![Text](https://d33wubrfki0l68.cloudfront.net/c38c7334cc3f23585738e40334284fddcaf03d5e/2e17c/images/hugo-logo-wide.svg "Title")
```
Here is a code example for how the render-image.html template could look:
{{< code file="layouts/_default/_markup/render-image.html" >}}
<p class="md__image">
<img src="{{ .Destination | safeURL }}" alt="{{ .Text }}" {{ with .Title}} title="{{ . }}"{{ end }} />
</p>
{{< /code >}}
#### Heading link example
Given this template file
{{< code file="layouts/_default/_markup/render-heading.html" >}}
<h{{ .Level }} id="{{ .Anchor | safeURL }}">{{ .Text | safeHTML }} <a href="#{{ .Anchor | safeURL }}">¶</a></h{{ .Level }}>
{{< /code >}}
And this markdown
```md
### Section A
```
The rendered html will be
```html
<h3 id="section-a">Section A <a href="#section-a">¶</a></h3>
```