rehype-textmarker

rehype-textmarker is a rehype plugin to highlight text pattern like e.g. TODO, FIXME or to highlight text surrounded by a defined symbol, e.g. this is ≈highlighted≈ text by enclosing the text with a <mark> tag.

See below example.

Usage

Say we have the following file example.md:

# Headline

Paragraph with ≈highlighted≈ text.

Inline code `console.≈log≈();`.

TODO things to do later

and a module example.js:

import { remark } from 'remark'
import remarkRehype from 'remark-rehype'
import rehypeTextmarker from 'rehype-textmarker'
import rehypeStringify from 'rehype-stringify'
import { read } from 'to-vfile'

const file = await remark()
  .use(remarkRehype)
  .use(rehypeTextmarker, [
    {
      textPattern: /≈([^≈]+)≈/g,
      className: 'yellow-marker',
      tags: ['p', 'code'],
    },
    {
      textPattern: /\b(TODO)\b/,
      className: 'red-marker',
    },
  ])
  .use(rehypeStringify)
  .process(await read('example.md'))

console.log(file.value)

then running node example.js yields:

<h1>Headline</h1>
<p>Paragraph with <mark class="yellow-marker">highlighted</mark> text.</p>
<p>
  Inline code <code>console.<mark class="yellow-marker">log</mark>();</code>.
</p>
<p><mark class="red-marker">TODO</mark> things to do later</p>

Test

pnpm run test

API

The default export is rehypeTextmarker.

unified().use(rehypeTextmarker, options)

Options

In order to define multiple regular expressions, put options into a list.

unified().use(rehypeTextmarker, options)
unified().use(rehypeTextmarker, [options_1, options_2, ... ])

where options is an object with at least a textPattern property.

The following options are available:

• textPattern (RegExp, mandatory) — regular expression which must contain a capturing group.

• htmlTag (string, optional) — HTML tag to sourround the captured string. Default is a mark tag.

• className (string, optional) — style class to be added to the html tag. Default is no style class.

• tags (array of string, optional) — list of tags within whose text is highlighted. It is also possible to define tags with class names, e.g. code.language-js which will only highlight wihtin Javascript code blocks . Default is p tag.

• ignore (array of string, optional) — list of tags or tags with class names to ignore. Default is [].