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140 lines
4.4 KiB
Markdown
140 lines
4.4 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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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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### 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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These Render Hooks allow custom templates to render links and images from markdown.
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You can do this by creating templates with base names `render-link` and/or `render-image` inside `layouts/_default`.
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You can define [Output Format](/templates/output-formats) specific templates if needed.[^hooktemplate] Your `layouts` folder may then 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 more 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
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### Render Hook Templates
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Both `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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A Markdown example for a inline-style link with title:
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```md
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[Text](https://www.gohugo.io "Title")
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```
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A very simple template example given the above:
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{{< code file="layouts/_default/render-link.html" >}}
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<a href="{{ .Destination | safeURL }}"{{ with .Title}}title="{{ . }}"{{ end }}>{{ .Text }}{{ with .Page }} (in page {{ .Title }}){{ end }}"</a>
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{{< /code >}}
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(look in the page bundle, inside `/assets` etc.) and [transform](/content-management/image-processing) images.
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[^hooktemplate]: It's currently only possible to have one set of render hook templates, e.g. not per `Type` or `Section`. We may consider that in a future version.
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