markdownlint-rule-relative-.../README.md

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<h1 align="center">markdownlint-rule-relative-links</h1>
<p align="center">
<strong>Custom rule for <a href="https://github.com/DavidAnson/markdownlint">markdownlint</a> to validate relative links.</strong>
</p>
<p align="center">
<a href="./CONTRIBUTING.md"><img src="https://img.shields.io/badge/PRs-welcome-brightgreen.svg?style=flat" /></a>
<a href="./LICENSE"><img src="https://img.shields.io/badge/licence-MIT-blue.svg" alt="Licence MIT"/></a>
<a href="./CODE_OF_CONDUCT.md"><img src="https://img.shields.io/badge/Contributor%20Covenant-v2.0%20adopted-ff69b4.svg" alt="Contributor Covenant" /></a>
<br />
<a href="https://github.com/theoludwig/markdownlint-rule-relative-links/actions/workflows/lint.yml"><img src="https://github.com/theoludwig/markdownlint-rule-relative-links/actions/workflows/lint.yml/badge.svg?branch=develop" /></a>
<a href="https://github.com/theoludwig/markdownlint-rule-relative-linksactions/workflows/test.yml"><img src="https://github.com/theoludwig/markdownlint-rule-relative-links/actions/workflows/test.yml/badge.svg?branch=develop" /></a>
<br />
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<a href="https://github.com/semantic-release/semantic-release"><img src="https://img.shields.io/badge/%20%20%F0%9F%93%A6%F0%9F%9A%80-semantic--release-e10079.svg" alt="semantic-release" /></a>
<a href="https://www.npmjs.com/package/markdownlint-rule-relative-links"><img src="https://img.shields.io/npm/v/markdownlint-rule-relative-links.svg" alt="npm version"></a>
</p>
## 📜 About
**markdownlint-rule-relative-links** is a [markdownlint](https://github.com/DavidAnson/markdownlint) custom rule to validate relative links.
It ensures that relative links (using `file:` protocol) are working and exists in the file system of the project that uses [markdownlint](https://github.com/DavidAnson/markdownlint).
### Example
File structure:
```txt
├── abc.txt
└── awesome.md
```
With `awesome.md` content:
```md
[abc](./abc.txt)
[Invalid link](./invalid.txt)
```
Running [markdownlint-cli2](https://github.com/DavidAnson/markdownlint-cli2) with `markdownlint-rule-relative-links` will output:
```sh
awesome.md:3 relative-links Relative links should be valid [Link "./invalid.txt" should exist in the file system]
```
### Related links
- [DavidAnson/markdownlint#253](https://github.com/DavidAnson/markdownlint/issues/253)
- [DavidAnson/markdownlint#121](https://github.com/DavidAnson/markdownlint/issues/121)
- [nschonni/markdownlint-valid-links](https://github.com/nschonni/markdownlint-valid-links)
## Prerequisites
- [Node.js](https://nodejs.org/) >= 16.0.0
## Installation
```sh
npm install --save-dev markdownlint-rule-relative-links
```
## Configuration
There are various ways [markdownlint](https://github.com/DavidAnson/markdownlint) can be configured using objects, config files etc. For more information on configuration refer to [options.config](https://github.com/DavidAnson/markdownlint#optionsconfig).
We recommend configuring [markdownlint-cli2](https://github.com/DavidAnson/markdownlint-cli2) over [markdownlint-cli](https://github.com/igorshubovych/markdownlint-cli) for compatibility with the [vscode-markdownlint](https://github.com/DavidAnson/vscode-markdownlint) extension.
`.markdownlint-cli2.jsonc`
```json
{
"config": {
"default": true,
"relative-links": true
},
"globs": ["**/*.{md,mdx}"],
"ignores": ["**/node_modules"],
"customRules": ["markdownlint-rule-relative-links"]
}
```
`package.json`
```json
{
"scripts": {
"lint:markdown": "markdownlint-cli2"
}
}
```
## Usage
```sh
npm run lint:markdown
```
## 💡 Contributing
Anyone can help to improve the project, submit a Feature Request, a bug report or even correct a simple spelling mistake.
The steps to contribute can be found in the [CONTRIBUTING.md](./CONTRIBUTING.md) file.
## 📄 License
[MIT](./LICENSE)