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138 lines
4.6 KiB
Markdown
138 lines
4.6 KiB
Markdown
---
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title: Syntax highlighting
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description: Hugo comes with really fast syntax highlighting from Chroma.
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categories: [content management]
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keywords: [highlighting,chroma,code blocks,syntax]
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menu:
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docs:
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parent: content-management
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weight: 250
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weight: 250
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toc: true
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aliases: [/extras/highlighting/,/extras/highlight/,/tools/syntax-highlighting/]
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---
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Hugo uses [Chroma](https://github.com/alecthomas/chroma) as its code highlighter; it is built in Go and is really, really fast.
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## Configure syntax highlighter
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See [Configure Highlight](/getting-started/configuration-markup#highlight).
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## Generate syntax highlighter CSS
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If you run with `markup.highlight.noClasses=false` in your site configuration, you need a style sheet. The style sheet will override the style specified in [`markup.highlight.style`](/functions/transform/highlight/#options).
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You can generate one with Hugo:
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```sh
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hugo gen chromastyles --style=monokai > syntax.css
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```
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Run `hugo gen chromastyles -h` for more options. See https://xyproto.github.io/splash/docs/ for a gallery of available styles.
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## Highlight shortcode
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Highlighting is carried out via the built-in [`highlight` shortcode](/content-management/shortcodes/#highlight). It takes exactly one required argument for the programming language to be highlighted and requires a closing tag.
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Options:
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* `linenos`: configure line numbers. Valid values are `true`, `false`, `table`, or `inline`. `false` will turn off line numbers if it's configured to be on in site configuration. `table` will give copy-and-paste friendly code blocks.
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* `hl_lines`: lists a set of line numbers or line number ranges to be highlighted.
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* `linenostart=199`: starts the line number count from 199.
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* `anchorlinenos`: Configure anchors on line numbers. Valid values are `true` or `false`;
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* `lineanchors`: Configure a prefix for the anchors on line numbers. Will be suffixed with `-`, so linking to the line number 1 with the option `lineanchors=prefix` adds the anchor `prefix-1` to the page.
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* `hl_inline` Highlight inside a `<code>` (inline HTML element) tag. Valid values are `true` or `false`. The `code` tag will get a class with name `code-inline`.
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### Example: highlight shortcode
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```go-html-template
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{{</* highlight go "linenos=table,hl_lines=8 15-17,linenostart=199" */>}}
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// ... code
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{{</* / highlight */>}}
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```
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Gives this:
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{{< highlight go "linenos=table,hl_lines=8 15-17,linenostart=199" >}}
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// GetTitleFunc returns a func that can be used to transform a string to
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// title case.
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//
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// The supported styles are
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//
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// - "Go" (strings.Title)
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// - "AP" (see https://www.apstylebook.com/)
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// - "Chicago" (see https://www.chicagomanualofstyle.org/home.html)
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//
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// If an unknown or empty style is provided, AP style is what you get.
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func GetTitleFunc(style string) func(s string) string {
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switch strings.ToLower(style) {
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case "go":
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return strings.Title
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case "chicago":
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return transform.NewTitleConverter(transform.ChicagoStyle)
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default:
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return transform.NewTitleConverter(transform.APStyle)
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}
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}
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{{< / highlight >}}
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## Highlight Hugo/Go template code
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For highlighting Hugo/Go template code on your page, add `/*` after the opening double curly braces and `*/` before closing curly braces.
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``` go
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{{</*/* myshortcode */*/>}}
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```
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Gives this:
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``` go
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{{</* myshortcode */>}}
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```
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## Highlight template function
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See [Highlight](/functions/transform/highlight/).
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## Highlighting in code fences
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Highlighting in code fences is enabled by default.
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````txt
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```go {linenos=table,hl_lines=[8,"15-17"],linenostart=199}
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// ... code
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```
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````
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Gives this:
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```go {linenos=table,hl_lines=[8,"15-17"],linenostart=199}
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// GetTitleFunc returns a func that can be used to transform a string to
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// title case.
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//
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// The supported styles are
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//
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// - "Go" (strings.Title)
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// - "AP" (see https://www.apstylebook.com/)
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// - "Chicago" (see https://www.chicagomanualofstyle.org/home.html)
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//
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// If an unknown or empty style is provided, AP style is what you get.
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func GetTitleFunc(style string) func(s string) string {
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switch strings.ToLower(style) {
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case "go":
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return strings.Title
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case "chicago":
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return transform.NewTitleConverter(transform.ChicagoStyle)
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default:
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return transform.NewTitleConverter(transform.APStyle)
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}
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}
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```
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The options are the same as in the [highlighting shortcode](/content-management/syntax-highlighting/#highlight-shortcode), including `linenos=false`, but note the slightly different Markdown attribute syntax.
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## List of Chroma highlighting languages
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The full list of Chroma lexers and their aliases (which is the identifier used in the `highlight` template func or when doing highlighting in code fences):
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{{< chroma-lexers >}}
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