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198 lines
6.4 KiB
Markdown
198 lines
6.4 KiB
Markdown
---
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title: Configure Markup
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description: How to handle Markdown and other markup related configuration.
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date: 2019-11-15
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categories: [getting started,fundamentals]
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keywords: [configuration,highlighting]
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weight: 65
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sections_weight: 65
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slug: configuration-markup
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toc: true
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---
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## Configure Markup
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{{< new-in "0.60.0" >}}
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See [Goldmark](#goldmark) for settings related to the default Markdown handler in Hugo.
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Below are all markup related configuration in Hugo with their default settings:
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{{< code-toggle config="markup" />}}
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**See each section below for details.**
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### Goldmark
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[Goldmark](https://github.com/yuin/goldmark/) is from Hugo 0.60 the default library used for Markdown. It's fast, it's [CommonMark](https://spec.commonmark.org/0.29/) compliant and it's very flexible. Note that the feature set of Goldmark vs Blackfriday isn't the same; you gain a lot but also lose some, but we will work to bridge any gap in the upcoming Hugo versions.
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This is the default configuration:
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{{< code-toggle config="markup.goldmark" />}}
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For details on the extensions, refer to [this section](https://github.com/yuin/goldmark/#built-in-extensions) of the Goldmark documentation
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Some settings explained:
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unsafe
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: By default, Goldmark does not render raw HTMLs and potentially dangerous links. If you have lots of inline HTML and/or JavaScript, you may need to turn this on.
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typographer
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: This extension substitutes punctuations with typographic entities like [smartypants](https://daringfireball.net/projects/smartypants/).
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autoHeadingIDType ("github") {{< new-in "0.62.2" >}}
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: The strategy used for creating auto IDs (anchor names). Available types are `github`, `github-ascii` and `blackfriday`. `github` produces GitHub-compatible IDs, `github-ascii` will drop any non-Ascii characters after accent normalization, and `blackfriday` will make the IDs work as with [Blackfriday](#blackfriday), the default Markdown engine before Hugo 0.60. Note that if Goldmark is your default Markdown engine, this is also the strategy used in the [anchorize](/functions/anchorize/) template func.
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### Blackfriday
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[Blackfriday](https://github.com/russross/blackfriday) was Hugo's default Markdown rendering engine, now replaced with Goldmark. But you can still use it: Just set `defaultMarkdownHandler` to `blackfriday` in your top level `markup` config.
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This is the default config:
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{{< code-toggle config="markup.blackFriday" />}}
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### Highlight
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This is the default `highlight` configuration. Note that some of these settings can be set per code block, see [Syntax Highlighting](/content-management/syntax-highlighting/).
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{{< code-toggle config="markup.highlight" />}}
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For `style`, see these galleries:
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* [Short snippets](https://xyproto.github.io/splash/docs/all.html)
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* [Long snippets](https://xyproto.github.io/splash/docs/longer/all.html)
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For CSS, see [Generate Syntax Highlighter CSS](/content-management/syntax-highlighting/#generate-syntax-highlighter-css).
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### Table Of Contents
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{{< code-toggle config="markup.tableOfContents" />}}
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These settings only works for the Goldmark renderer:
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startLevel
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: The heading level, values starting at 1 (`h1`), to start render the table of contents.
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endLevel
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: The heading level, inclusive, to stop render the table of contents.
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ordered
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: Whether or not to generate an ordered list instead of an unordered list.
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## Markdown Render Hooks
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{{< new-in "0.62.0" >}}
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Note that this is only supported with the [Goldmark](#goldmark) renderer.
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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`.
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You can also create type/section specific hooks in `layouts/[type/section]/_markup`, e.g.: `layouts/blog/_markup`.{{< new-in "0.71.0" >}}
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The features currently supported are:
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* `image`
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* `link`
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* `heading` {{< new-in "0.71.0" >}}
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You can define [Output-Format-](/templates/output-formats) and [language-](/content-management/multilingual/)specific templates if needed. Your `layouts` folder may look like this:
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```bash
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layouts
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└── _default
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└── _markup
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├── render-image.html
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├── render-image.rss.xml
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└── render-link.html
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```
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Some use cases for the above:
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* 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.
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* Add `target=_blank` to external links.
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* Resolve and [process](/content-management/image-processing/) images.
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* Add [header links](https://remysharp.com/2014/08/08/automatic-permalinks-for-blog-posts).
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### Render Hook Templates
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The `render-link` and `render-image` templates will receive this context:
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Page
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: The [Page](/variables/page/) being rendered.
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Destination
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: The URL.
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Title
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: The title attribute.
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Text
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: The rendered (HTML) link text.
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PlainText
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: The plain variant of the above.
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The `render-heading` template will receive this context:
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Page
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: The [Page](/variables/page/) being rendered.
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Level
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: The header level (1--6)
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Anchor
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: An auto-generated html id unique to the header within the page
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Text
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: The rendered (HTML) text.
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PlainText
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: The plain variant of the above.
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#### Link with title Markdown example:
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```md
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[Text](https://www.gohugo.io "Title")
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```
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Here is a code example for how the render-link.html template could look:
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{{< code file="layouts/_default/_markup/render-link.html" >}}
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<a href="{{ .Destination | safeURL }}"{{ with .Title}} title="{{ . }}"{{ end }}{{ if strings.HasPrefix .Destination "http" }} target="_blank" rel="noopener"{{ end }}>{{ .Text | safeHTML }}</a>
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{{< /code >}}
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#### Image Markdown example:
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```md
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```
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Here is a code example for how the render-image.html template could look:
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{{< code file="layouts/_default/_markup/render-image.html" >}}
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<p class="md__image">
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<img src="{{ .Destination | safeURL }}" alt="{{ .Text }}" {{ with .Title}} title="{{ . }}"{{ end }} />
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</p>
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{{< /code >}}
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#### Heading link example
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Given this template file
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{{< code file="layouts/_default/_markup/render-heading.html" >}}
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<h{{ .Level }} id="{{ .Anchor | safeURL }}">{{ .Text | safeHTML }} <a href="#{{ .Anchor | safeURL }}">¶</a></h{{ .Level }}>
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{{< /code >}}
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And this markdown
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```md
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### Section A
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```
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The rendered html will be
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```html
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<h3 id="section-a">Section A <a href="#section-a">¶</a></h3>
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```
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