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# \<code-block\>

> A Web component that displays colorfully **formatted code** with [Prism.js]
> and [LitElement].

![](https://raw.githubusercontent.com/SherbyElements/code-block/2.0.0/demo/default-code-block.jpg)

## Features

- Loads [Prism.js] language definitions and custom themes on demand via dynamic
  imports
- Support the languages aliases of Prism.js
- Add the language name automatically in the top-right corner of the block
- Remove automatically beginning spaces to allow you to format your code with
  indentation
- Allow to extend the class for further customizations
- Built as a web component on [LitElement]

## Installation

```bash
npm install @sherby/code-block
```

## Use

To use this element, import it in your component:

```javascript
import '@sherby/code-block';
```

And add a `code-block` element in your component template.

```html
<code-block language="javascript">function helloWorld(say) { console.log(say); } helloWorld('Hi there!');</code-block>
```

## Attributes

You can override the following attributes to met your needs:

| Name                   | Description                                                                                                             | Default                                                    |
| ---------------------- | ----------------------------------------------------------------------------------------------------------------------- | ---------------------------------------------------------- |
| `language`             | Code language you wish to utilize from Prism                                                                            | `markdown`                                                 |
| `languageFileTemplate` | Template URL where the language file can be automatically imported, where `{LANGUAGE}` will be replaced by the language | `/node_modules/prismjs/components/prism-{LANGUAGE}.min.js` |
| `theme`                | Path to Prism CSS theme file                                                                                            | `twilight`                                                 |
| `themeFileTemplate`    | Template URL where the theme file can be automatically imported, where `{THEME}` will be replaced by the theme          | `/node_modules/prismjs/themes/prism.css`                   |

## Building

If you want the ability to load the full spectrum of languages that Prism
supports, you'll want to make sure your build script includes the
`/node_modules/prismjs/**`, as there are many language resources.

## Develop

```bash
# Clone the project
git clone git@github.com:sherby/code-block.git

# Go to the project directory
cd code-block

# Install the dependencies
npm install

# Start the demo page
npm start
```

## Polyfills Required

`code-block` utilizes Custom Elements and Shadow DOM ([Web Components](https://developer.mozilla.org/en-US/docs/Web/Web_Components)). As you can see in the table below, you'll need some polyfills to make use of this across a wide range of browsers.

| Platform Support     | Chrome | Chrome for Android | Firefox | Safari | iOS Safari | Edge | IE 11 |
| -------------------- | :----: | :----------------: | :-----: | :----: | :--------: | :--: | :---: |
| Supported            |   ✓    |         ✓          |    ✓    |   ✓    |     ✓      |  ✓   |   ✓   |
| Polyfill(s) Required |   -    |         -          |    ✓    |   ✓    |     ✓      |  ✓   |   ✓   |

Within your project, you can load them as such:

```html
<script src="../node_modules/@webcomponents/webcomponentsjs/webcomponents-loader.js"></script>
```

## Thanks

Special thanks to [Justin Ribeiro](https://github.com/justinribeiro) for his [code-block](https://github.com/justinribeiro/code-block) component that this project is forked from.

## Publish

Increment the `version` defined in the `package.json` file and run the command below to publish the module in the
registry:

```bash
# Dry run
npm publish --dry-run

# For real (are you really sure?)
npm publish --access public
```

## License

The [MIT License][1] (MIT)

[1]: https://opensource.org/licenses/MIT
[prism.js]: https://prismjs.com/
[litelement]: https://lit.dev/