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104 lines
3.8 KiB
Markdown
104 lines
3.8 KiB
Markdown
---
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title: highlight
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linktitle: highlight
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description: Renders code with a syntax highlighter.
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date: 2017-02-01
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publishdate: 2017-02-01
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lastmod: 2021-12-06
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categories: [functions]
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menu:
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docs:
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parent: "functions"
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keywords: [highlighting,code blocks,syntax]
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signature: ["transform.Highlight INPUT LANG [OPTIONS]","highlight INPUT LANG [OPTIONS]"]
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relatedfuncs: []
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deprecated: false
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toc: true
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---
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The `highlight` function uses the [Chroma] syntax highlighter, supporting over 200 languages with more than 40 available styles.
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## Parameters
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INPUT
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: The code to highlight.
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LANG
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: The language of the code to highlight. Choose from one of the [supported languages]. Case-insensitive.
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OPTIONS
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: An optional, comma-separated list of zero or more [options]. Set default values in [site configuration].
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## Options
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lineNos
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: Boolean. Default is `false`.\
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Display a number at the beginning of each line.
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lineNumbersInTable
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: Boolean. Default is `true`.\
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Render the highlighted code in an HTML table with two cells. The left table cell contains the line numbers. The right table cell contains the code, allowing a user to select and copy the code without line numbers. Irrelevant if `lineNos` is false.
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anchorLineNos
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: Boolean. Default is `false`.\
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Render each line number as an HTML anchor element, and set the `id` attribute of the surrounding `<span>` to the line number. Irrelevant if `lineNos` is false.
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lineAnchors
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: String. Default is `""`.\
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When rendering a line number as an HTML anchor element, prepend this value to the `id` attribute of the surrounding `<span>`. This provides unique `id` attributes when a page contains two or more code blocks. Irrelevant if `lineNos` or `anchorLineNos` is false.
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lineNoStart
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: Integer. Default is `1`.\
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The number to display at the beginning of the first line. Irrelevant if `lineNos` is false.
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hl_Lines
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: String. Default is `""`.\
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A space-separated list of lines to emphasize within the highlighted code. To emphasize lines 2, 3, 4, and 7, set this value to `2-4 7`. This option is independent of the `lineNoStart` option.
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style
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: String. Default is `monokai`.\
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The CSS styles to apply to the highlighted code. See the [style gallery] for examples. Case-sensitive.
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noClasses
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: Boolean. Default is `true`.\
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Use inline CSS styles instead of an external CSS file. To use an external CSS file, set this value to `false` and [generate the file with the hugo client][hugo client].
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tabWidth
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: Integer. Default is `4`.\
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Substitute this number of spaces for each tab character in your highlighted code.
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guessSyntax
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: Boolean. Default is `false`.\
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If the `LANG` parameter is blank or an unrecognized language, auto-detect the language if possible, otherwise use a fallback language.
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{{% note %}}
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Instead of specifying both `lineNos` and `lineNumbersInTable`, you can use the following shorthand notation:
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`lineNos=inline`
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: equivalent to `lineNos=true` and `lineNumbersInTable=false`
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`lineNos=table`
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: equivalent to `lineNos=true` and `lineNumbersInTable=true`
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{{% /note %}}
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## Examples
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```go-html-template
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{{ $input := `fmt.Println("Hello World!")` }}
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{{ transform.Highlight $input "go" }}
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{{ $input := `console.log('Hello World!');` }}
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{{ $lang := "js" }}
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{{ transform.Highlight $input $lang "lineNos=table, style=api" }}
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{{ $input := `echo "Hello World!"` }}
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{{ $lang := "bash" }}
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{{ $options := slice "lineNos=table" "style=dracula" }}
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{{ transform.Highlight $input $lang (delimit $options ",") }}
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```
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[Chroma]: https://github.com/alecthomas/chroma
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[hugo client]: {{< relref "commands/hugo_gen_chromastyles" >}}
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[options]: {{< relref "#options" >}}
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[site configuration]: {{< relref "getting-started/configuration-markup#highlight">}}
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[style gallery]: https://xyproto.github.io/splash/docs/
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[supported languages]: {{< relref "content-management/syntax-highlighting#list-of-chroma-highlighting-languages" >}}
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