asciidoctor-highlight.js

This project provides an Asciidoctor.js extension for highlighting source listing blocks using highlight.js right during document conversion (instead of in browser on client-side as the built-in highlight.js support).

It supports all Asciidoctor features such as callouts, passthroughs inside a code and all other substitutions, except highlighting of specified lines (attribute highlight).

Requirements

• Node.js >=8.10 [1]

• @asciidoctor/core >=2.0.0 <2.3.0

• highlight.js >=10.7.0 <12.0.0

Installation

Install asciidoctor-highlight.js from npmjs.com:

npm install --save asciidoctor-highlight.js

Usage

Assign highlightjs-ext to the source-highlighter attribute in your document’s header or via Asciidoctor.js parameters.

Node.js

Using global extensions registry.

// Load asciidoctor.js and asciidoctor-highlight.js.
const asciidoctor = require('@asciidoctor/core')()
const highlightJsExt = require('asciidoctor-highlight.js')

// Register the extension into global registry.
highlightJsExt.register(asciidoctor.Extensions)

// Convert the content to HTML.
const content = `
[source, js]
console.log('Hello, world!')
`
const html = asciidoctor.convert(content, {
  attributes: { 'source-highlighter': 'highlightjs-ext' },
})
console.log(html)

Using custom extensions registry.

// Load asciidoctor.js and asciidoctor-highlight.js.
const asciidoctor = require('@asciidoctor/core')()
const highlightJsExt = require('asciidoctor-highlight.js')

// Register the extension into custom registry.
const registry = asciidoctor.Extensions.create()
highlightJsExt.register(registry)

// Convert the content to HTML.
const content = `
[source, js]
console.log('Hello, world!')
`
const html = asciidoctor.convert(content, {
  'extension_registry': registry,
  attributes: { 'source-highlighter': 'highlightjs-ext' },
})
console.log(html)

Attributes

You can further customize the source block output with additional highlight.js attributes:

• highlightjs-default-lang
  Controls the default source code language for fallback when the language is not specified in a source block or with attribute source-language. It can be any language name or alias supported by highlight.js, none to skip highlighting, or auto to use highlight.js’s auto-detection. The default is none.

License

This project is licensed under MIT License. For the full text of the license, see the LICENSE file.

1. Node versions older than 12.0.0 are not tested since 0.4.0.