# rehype-cli

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[![Downloads][downloads-badge]][downloads]
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Command line interface to inspect and change HTML files with **[rehype][]**.

## Contents

* [What is this?](#what-is-this)
* [When should I use this?](#when-should-i-use-this)
* [Install](#install)
* [Use](#use)
* [CLI](#cli)
* [Compatibility](#compatibility)
* [Security](#security)
* [Contribute](#contribute)
* [Sponsor](#sponsor)
* [License](#license)

## What is this?

This package is a command line interface (CLI) that you can use in your terminal
or in npm scripts and the like to inspect and change HTML files.
This CLI is built around rehype, which is an ecosystem of plugins that work with
HTML as structured data, specifically ASTs (abstract syntax trees).
You can choose from the existing plugins or make your own.

See [the monorepo readme][rehype] for info on what the rehype ecosystem is.

## When should I use this?

You can use this package when you want to work with the HTML files in your
project from the command line.
`rehype-cli` has many options and you can combine it with many plugins, so it
should be possible to do what you want.
If not, you can always use [`rehype`][rehype-core] itself manually in a script.

## Install

This package is [ESM only][esm].
In Node.js (version 16+), install with [npm][]:

```sh
npm install rehype-cli
```

## Use

Format `index.html` with [`rehype-format`][rehype-format]:

```sh
rehype index.html --use rehype-format --output
```

## CLI

The interface of `rehype-cli` is explained as follows on its help page
(`rehype --help`):

```txt
Usage: rehype [options] [path | glob ...]

  CLI to process HTML with rehype

Options:

      --[no-]color                        specify color in report (on by default)
      --[no-]config                       search for configuration files (on by default)
  -e  --ext <extensions>                  specify extensions
      --file-path <path>                  specify path to process as
  -f  --frail                             exit with 1 on warnings
  -h  --help                              output usage information
      --[no-]ignore                       search for ignore files (on by default)
  -i  --ignore-path <path>                specify ignore file
      --ignore-path-resolve-from cwd|dir  resolve patterns in `ignore-path` from its directory or cwd
      --ignore-pattern <globs>            specify ignore patterns
      --inspect                           output formatted syntax tree
  -o  --output [path]                     specify output location
  -q  --quiet                             output only warnings and errors
  -r  --rc-path <path>                    specify configuration file
      --report <reporter>                 specify reporter
  -s  --setting <settings>                specify settings
  -S  --silent                            output only errors
      --silently-ignore                   do not fail when given ignored files
      --[no-]stdout                       specify writing to stdout (on by default)
  -t  --tree                              specify input and output as syntax tree
      --tree-in                           specify input as syntax tree
      --tree-out                          output syntax tree
  -u  --use <plugins>                     use plugins
      --verbose                           report extra info for messages
  -v  --version                           output version number
  -w  --watch                             watch for changes and reprocess

Examples:

  # Process `input.html`
  $ rehype input.html -o output.html

  # Pipe
  $ rehype < input.html > output.html

  # Rewrite all applicable files
  $ rehype . -o
```

More info on all these options is available at [`unified-args`][unified-args],
which does the work.
`rehype-cli` is `unified-args` preconfigured to:

* load `rehype-` plugins
* search for HTML extensions (`.html`, `.htm`, `.xht`, `.xhtml`)
* ignore paths found in [`.rehypeignore` files][ignore-file]
* load configuration from
  [`.rehyperc`, `.rehyperc.js`, etc files][config-file]
* use configuration from
  [`rehype` fields in `package.json` files][config-file]

## Compatibility

Projects maintained by the unified collective are compatible with maintained
versions of Node.js.

When we cut a new major release, we drop support for unmaintained versions of
Node.
This means we try to keep the current release line, `rehype-cli@^12`,
compatible with Node.js 16.

## Security

As **rehype** works on HTML, and improper use of HTML can open you up to a
[cross-site scripting (XSS)][xss] attack, use of rehype can also be unsafe.
Use [`rehype-sanitize`][rehype-sanitize] to make the tree safe.

Use of rehype plugins could also open you up to other attacks.
Carefully assess each plugin and the risks involved in using them.

For info on how to submit a report, see our [security policy][security].

## Contribute

See [`contributing.md`][contributing] in [`rehypejs/.github`][health] for ways
to get started.
See [`support.md`][support] for ways to get help.

This project has a [code of conduct][coc].
By interacting with this repository, organization, or community you agree to
abide by its terms.

## Sponsor

Support this effort and give back by sponsoring on [OpenCollective][collective]!

<table>
<tr valign="middle">
<td width="20%" align="center" rowspan="2" colspan="2">
  <a href="https://vercel.com">Vercel</a><br><br>
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</td>
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</td>
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</td>
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  <a href="https://themeisle.com">ThemeIsle</a><br><br>
  <a href="https://themeisle.com"><img src="https://avatars1.githubusercontent.com/u/58979018?s=128&v=4" width="64"></a>
</td>
<td width="10%" align="center">
  <a href="https://expo.io">Expo</a><br><br>
  <a href="https://expo.io"><img src="https://avatars1.githubusercontent.com/u/12504344?s=128&v=4" width="64"></a>
</td>
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</td>
<td width="10%"></td>
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</tr>
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  <br>
  <a href="https://opencollective.com/unified"><strong>You?</strong></a>
  <br><br>
</td>
</tr>
</table>

## License

[MIT][license] © [Titus Wormer][author]

<!-- Definitions -->

[build-badge]: https://github.com/rehypejs/rehype/workflows/main/badge.svg

[build]: https://github.com/rehypejs/rehype/actions

[coverage-badge]: https://img.shields.io/codecov/c/github/rehypejs/rehype.svg

[coverage]: https://codecov.io/github/rehypejs/rehype

[downloads-badge]: https://img.shields.io/npm/dm/rehype-cli.svg

[downloads]: https://www.npmjs.com/package/rehype-cli

[sponsors-badge]: https://opencollective.com/unified/sponsors/badge.svg

[backers-badge]: https://opencollective.com/unified/backers/badge.svg

[collective]: https://opencollective.com/unified

[chat-badge]: https://img.shields.io/badge/chat-discussions-success.svg

[chat]: https://github.com/rehypejs/rehype/discussions

[health]: https://github.com/rehypejs/.github

[security]: https://github.com/rehypejs/.github/blob/main/security.md

[contributing]: https://github.com/rehypejs/.github/blob/main/contributing.md

[support]: https://github.com/rehypejs/.github/blob/main/support.md

[coc]: https://github.com/rehypejs/.github/blob/main/code-of-conduct.md

[license]: https://github.com/rehypejs/rehype/blob/main/license

[author]: https://wooorm.com

[esm]: https://gist.github.com/sindresorhus/a39789f98801d908bbc7ff3ecc99d99c

[npm]: https://docs.npmjs.com/cli/install

[rehype]: https://github.com/rehypejs/rehype

[xss]: https://en.wikipedia.org/wiki/Cross-site_scripting

[rehype-core]: ../rehype/

[rehype-format]: https://github.com/rehypejs/rehype-format

[rehype-sanitize]: https://github.com/rehypejs/rehype-sanitize

[config-file]: https://github.com/unifiedjs/unified-engine/blob/main/readme.md#config-files

[ignore-file]: https://github.com/unifiedjs/unified-engine/blob/main/readme.md#ignore-files

[unified-args]: https://github.com/unifiedjs/unified-args#cli