hugo/docs/content/en/content-management/syntax-highlighting.md

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Syntax highlighting	Hugo comes with really fast syntax highlighting from Chroma.	highlighting chroma code blocks syntax	content management	docs parent weight content-management 240	true	240	/extras/highlighting/ /extras/highlight/ /tools/syntax-highlighting/

Hugo uses Chroma as its code highlighter; it is built in Go and is really, really fast.

Configure syntax highlighter

See Configure Highlight.

Generate syntax highlighter CSS

If you run with markup.highlight.noClasses=false in your site configuration, you need a style sheet.

You can generate one with Hugo:

hugo gen chromastyles --style=monokai > syntax.css

Run hugo gen chromastyles -h for more options. See https://xyproto.github.io/splash/docs/ for a gallery of available styles.

Highlight shortcode

Highlighting is carried out via the built-in highlight shortcode. It takes exactly one required parameter for the programming language to be highlighted and requires a closing shortcode.

Options:

• 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.
• hl_lines: lists a set of line numbers or line number ranges to be highlighted.
• linenostart=199: starts the line number count from 199.
• anchorlinenos: Configure anchors on line numbers. Valid values are true or false;
• 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.
• 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. {{< new-in "0.101.0" >}}

Example: highlight shortcode

{{</* highlight go "linenos=table,hl_lines=8 15-17,linenostart=199" */>}}
// ... code
{{</* / highlight */>}}

Gives this:

{{< highlight go "linenos=table,hl_lines=8 15-17,linenostart=199" >}} // GetTitleFunc returns a func that can be used to transform a string to // title case. // // The supported styles are // // - "Go" (strings.Title) // - "AP" (see https://www.apstylebook.com/) // - "Chicago" (see https://www.chicagomanualofstyle.org/home.html) // // If an unknown or empty style is provided, AP style is what you get. func GetTitleFunc(style string) func(s string) string { switch strings.ToLower(style) { case "go": return strings.Title case "chicago": return transform.NewTitleConverter(transform.ChicagoStyle) default: return transform.NewTitleConverter(transform.APStyle) } } {{< / highlight >}}

Highlight Hugo/Go template code

For highlighting Hugo/Go template code on your page, add /* after the opening double curly braces and */ before closing curly braces.

{{</*/* myshortcode */*/>}}

Gives this:

{{</* myshortcode */>}}

Highlight template function

See Highlight.

Highlighting in code fences

Highlighting in code fences is enabled by default.

```go {linenos=table,hl_lines=[8,"15-17"],linenostart=199}
// ... code
```

Gives this:

199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218


// GetTitleFunc returns a func that can be used to transform a string to
// title case.
//
// The supported styles are
//
// - "Go" (strings.Title)
// - "AP" (see https://www.apstylebook.com/)
// - "Chicago" (see https://www.chicagomanualofstyle.org/home.html)
//
// If an unknown or empty style is provided, AP style is what you get.
func GetTitleFunc(style string) func(s string) string {
  switch strings.ToLower(style) {
  case "go":
    return strings.Title
  case "chicago":
    return transform.NewTitleConverter(transform.ChicagoStyle)
  default:
    return transform.NewTitleConverter(transform.APStyle)
  }
}

The options are the same as in the highlighting shortcode, including linenos=false, but note the slightly different Markdown attribute syntax.

List of Chroma highlighting languages

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):

{{< chroma-lexers >}}