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433 lines
12 KiB
Markdown
433 lines
12 KiB
Markdown
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# <zero-md>
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> Ridiculously simple zero-config markdown displayer
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A native markdown-to-html web component based on [Custom Elements V1 specs](https://www.w3.org/TR/custom-elements/)
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to load and display an external MD file. Under the hood, it uses [Marked](https://github.com/markedjs/marked) for
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super-fast markdown transformation, and [Prism](https://github.com/PrismJS/prism) for feature-packed syntax
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highlighting - automagically rendering into its own self-contained shadow DOM container, while encapsulating
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implementation details into one embarassingly easy-to-use package.
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**NOTE: This is the V2 branch. If you're looking for the older version, see the [V1 branch](https://github.com/zerodevx/zero-md/tree/v1).**
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Featuring:
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- [x] Automated hash-link scrolls
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- [x] Built-in FOUC prevention
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- [x] Automatically rewrite URLs relative to `src`
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- [x] Automatically re-render when `src` changes
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- [x] Automatically re-render when inline markdown or style template changes
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- [x] Support for >200 code languages with detection for unhinted code blocks
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- [x] Easy styling mechanism
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- [x] Highly extensible
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Documentation: https://zerodevx.github.io/zero-md/
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**NOTE: Your markdown file(s) needs to be hosted! Browsers don't generally allow javascript to access files on
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the local hard drive because of security concerns. Standard
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[CORS](https://developer.mozilla.org/en-US/docs/Web/HTTP/CORS) rules apply.**
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## Installation
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### Load via CDN (recommended)
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`zero-md` is designed to be zero-config with good defaults. For most use-cases, just importing the script from CDN
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and consuming the component directly should suffice.
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```html
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<head>
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...
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<!-- Import element definition -->
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<script type="module" src="https://cdn.jsdelivr.net/gh/zerodevx/zero-md@2/dist/zero-md.min.js"></script>
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...
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</head>
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<body>
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...
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<!-- Profit! -->
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<zero-md src="/example.md"></zero-md>
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...
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</body>
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```
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Latest stable: `https://cdn.jsdelivr.net/gh/zerodevx/zero-md@2/dist/zero-md.min.js`
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Latest beta: `https://cdn.jsdelivr.net/npm/zero-md@next/dist/zero-md.min.js`
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### Install in web projects
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Install package with `npm` or `yarn`. Note that you'll need [Node.js](https://nodejs.org/) installed.
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```
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$ npm install --save zero-md
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```
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Import the class, register the element, and use anywhere.
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```js
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// Import the element definition
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import ZeroMd from 'zero-md'
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// Register the custom element
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customElements.define('zero-md', ZeroMd)
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// Render anywhere
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app.render(`<zero-md src=${src}></zero-md>`, target)
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```
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Or load the distribution directly in HTML.
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```html
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<script type="module" src="/node_modules/zero-md/dist/zero-md.min.js"></script>
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...
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<zero-md src="example.md"></zero-md>
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```
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## Basic Usage
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### Display an external markdown file
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```html
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<!-- Simply set the `src` attribute and win -->
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<zero-md src="https://example.com/markdown.md"></zero-md>
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```
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At its most basic, `<zero-md>` loads and displays an external MD file with **default stylesheets** - a Github-themed
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stylesheet paired with a light-themed one for code blocks, just like what you see in these docs. So internally,
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the above code block is semantically equivalent to the one below:
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```html
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<zero-md src="https://example.com/markdown.md">
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<!-- By default, this style template gets loaded -->
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<template>
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<link rel="stylesheet" href="https://cdn.jsdelivr.net/gh/sindresorhus/github-markdown-css@4/github-markdown.min.css">
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<link rel="stylesheet" href="https://cdn.jsdelivr.net/gh/PrismJS/prism@1/themes/prism.min.css">
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</template>
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</zero-md>
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```
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### Using your own styles
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To override the default theme, supply your own style template.
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```html
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<zero-md src="https://example.com/markdown.md">
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<!-- Wrap with a <template> tag -->
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<template>
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<!-- Define your own styles inside a `<style>` tag -->
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<style>
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h1 {
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color: red;
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}
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...
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</style>
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</template>
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</zero-md>
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```
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### Or your own stylesheets
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```html
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<zero-md src="https://example.com/markdown.md">
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<!-- Wrap with a <template> tag -->
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<template>
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<!-- Load external stylesheets with a `<link rel="stylesheet">` tag -->
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<link rel="stylesheet" href="markdown-styles.css">
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<link rel="stylesheet" href="highlight-styles.css">
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</template>
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</zero-md>
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```
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### Or both
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```html
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<zero-md src="https://example.com/markdown.md">
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<template>
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<!-- The CSS load order is respected -->
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<link rel="stylesheet" href="markdown-styles.css">
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<style>
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h1 {
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color: red;
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}
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</style>
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<link rel="stylesheet" href="highlight-styles.css">
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<style>
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code {
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background: yellow;
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}
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</style>
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</template>
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</zero-md>
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```
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### Write markdown inline
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You can pass in your markdown inline too.
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```html
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<!-- Do not set the `src` attribute -->
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<zero-md>
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<!-- Write your markdown inside a `<script type="text/markdown">` tag -->
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<script type="text/markdown">
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# **This** is my [markdown](https://example.com)
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</script>
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</zero-md>
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```
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By default, `<zero-md>` first tries to render `src`. If `src` is falsy (undefined, file not found, empty file etc),
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it **falls-back** to the contents inside the `<script type="text/markdown">` tag.
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### Put it all together
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```html
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<zero-md src="https://example.com/markdown.md">
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<template>
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<link rel="stylesheet" href="markdown-styles.css">
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<style>
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h1 {
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color: red;
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}
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</style>
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<link rel="stylesheet" href="highlight-styles.css">
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<style>
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code {
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background: yellow;
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}
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</style>
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</template>
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<script type="text/markdown">
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This is the fall-back markdown that will **only show** when `src` is falsy.
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</script>
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</zero-md>
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```
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## API
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Advanced usage: https://zerodevx.github.io/zero-md/advanced-usage/
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Attributes and helpers: https://zerodevx.github.io/zero-md/attributes-and-helpers/
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Configuration: https://zerodevx.github.io/zero-md/configuration/
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## Migrating from V1 to V2
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1. Support for `<xmp>` tag is removed; use `<script type="text/markdown">` instead.
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```html
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<!-- Previous -->
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<zero-md>
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<template>
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<xmp>
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# `This` is my [markdown](example.md)
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</xmp>
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</template>
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</zero-md>
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<!-- Now -->
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<zero-md>
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<!-- No need to wrap with <template> tag -->
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<script type="text/markdown">
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# `This` is my [markdown](example.md)
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</script>
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</zero-md>
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<!-- If you need your code to be pretty, -->
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<zero-md>
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<!-- Set `data-dedent` to opt-in to dedent the text during render -->
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<script type="text/markdown" data-dedent>
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# It is important to be pretty
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So having spacing makes me happy.
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</script>
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</zero-md>
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```
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2. Markdown source behaviour has changed. Think of `<script type="text/markdown">` as a "fallback".
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```html
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<!-- Previous -->
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<zero-md src="will-not-render.md">
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<template>
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<xmp>
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# This has first priority and will be rendered instead of `will-not-render.md`
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</xmp>
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</template>
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<zero-md>
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<!-- Now -->
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<zero-md src="will-render-unless-falsy.md">
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<script type="text/markdown">
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# This will NOT be rendered *unless* `src` resolves to falsy
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</script>
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<zero-md>
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```
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3. The `css-urls` attribute is deprecated. Use `<link rel="stylesheet">` instead.
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```html
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<!-- Previous -->
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<zero-md src="example.md" css-urls='["/style1.css", "/style2.css"]'><zero-md>
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<!-- Now, this... -->
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<zero-md src="example.md"></zero-md>
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<!-- ...is actually equivalent to this -->
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<zero-md src="example.md">
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<template>
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<!-- These are the default stylesheets -->
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<link rel="stylesheet" href="https://cdn.jsdelivr.net/gh/sindresorhus/github-markdown-css@4/github-markdown.min.css">
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<link rel="stylesheet" href="https://cdn.jsdelivr.net/gh/PrismJS/prism@1/themes/prism.min.css">
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</template>
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</zero-md>
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<!-- So, to apply your own external stylesheets... -->
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<zero-md src="example.md">
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<!-- ...you overwrite the default template -->
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<template>
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<!-- Use <link> tags to reference your own stylesheets -->
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<link rel="stylesheet" href="/style1.css">
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<link rel="stylesheet" href="/style2.css">
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<!-- You can even apply additional styles -->
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<style>
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p {
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color: red;
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}
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</style>
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</template>
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</zero-md>
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<!-- If you like the default stylesheets but wish to apply some overrides -->
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<zero-md src="example.md">
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<!-- Set `data-merge` to "append" to apply this template AFTER the default template -->
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<!-- Or "prepend" to apply this template BEFORE -->
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<template data-merge="append">
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<style>
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p {
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color: red;
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}
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</style>
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</template>
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</zero-md>
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```
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4. The attributes `marked-url` and `prism-url` are deprecated. To load `marked` or `prism` from another
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location, simply load their scripts *before* importing `zero-md`.
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```html
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<head>
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...
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<script defer src="/lib/marked.js"></script>
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<script defer src="/lib/prism.js"></script>
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<script type="module" src="/lib/zero-md.min.js"></script>
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</head>
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```
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5. The global config object has been renamed from `ZeroMd.config` to `ZeroMdConfig`.
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```html
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<!-- Previous -->
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<script src="/node_modules/@webcomponents/webcomponentsjs/webcomponents-loader.js"></script>
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<script>
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window.ZeroMd = {
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config: {
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cssUrls: [
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'/styles/my-markdown-theme.css',
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'/styles/my-highlight-theme.css'
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]
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}
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};
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</script>
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<script type="module" src="https://cdn.jsdelivr.net/gh/zerodevx/zero-md@1/src/zero-md.min.js"></script>
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<!-- Now -->
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<script>
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window.ZeroMdConfig = {
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cssUrls: [
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'/styles/my-markdown-theme.css',
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'/styles/my-highlight-theme.css'
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]
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}
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</script>
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<script type="module" src="https://cdn.jsdelivr.net/gh/zerodevx/zero-md@2/dist/zero-md.min.js"></script>
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```
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6. The convenience events `zero-md-marked-ready` and `zero-md-prism-ready` are removed and **will no longer fire**.
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Instead, the `zero-md-ready` event guarantees that everything is ready, and that render can begin.
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## Contributing
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### Noticed a bug? Have a feature request?
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Open a new [issue](https://github.com/zerodevx/zero-md/issues) in the Github repo, or raise a
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[PR](https://github.com/zerodevx/zero-md/pulls)! I'd be stoked to accept any contributions!
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### Develop locally
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#### Install
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Fork and clone the project, then install dependencies.
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```bash
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$ cd zero-md
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$ npm install
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```
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#### Run the dev server
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```bash
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$ npm run dev
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```
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Open your browser to `http://localhost:5000`. You should see the test suite running.
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#### Testing
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Tests are browser-based and run on [Mocha](https://mochajs.org/) with [Chai](https://www.chaijs.com/)
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asserts. If you're adding a new feature or bugfixing, please add the corresponding regression test
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into `test/index.spec.js` accordingly.
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Tests can be run by pointing your browser to `http://localhost:5000`.
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#### Linting
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Code should be in [Standardjs](https://standardjs.com/) format. Run the linter with:
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```bash
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$ npm run lint
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```
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#### Making changes to source
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If you're adding a new feature or bugfixing, please commit your changes into a new branch and raise
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a pull-request into the `main` branch upstream, and reference the related issues.
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#### Running the docs
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The docs (as seen in `https://zerodevx.github.io/zero-md/`) can be accessed by pointing your browser
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to `http://localhost:5000/docs/` (note the trailing slash).
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#### Making changes to docs
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Documentation is stored in the `/docs` folder, published with [Github Pages](https://pages.github.com/)
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and based on [`zero-md-docs`](https://github.com/zerodevx/zero-md-docs). The markdown for each
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section is located in `readme.md` in its corresponding pretty URL.
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In general, just raising a PR on `readme.md` files should suffice.
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## License
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ISC
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## Acknowledgements
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Big thank you to contributors
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[@EmilePerron](https://github.com/EmilePerron),
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[@bennypowers](https://github.com/bennypowers),
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[@TheUnlocked](https://github.com/TheUnlocked),
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[@ernsheong](https://github.com/ernsheong)
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for your code commits. :thumbsup:
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## Version History
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Check out the [releases](https://github.com/zerodevx/zero-md/releases) page.
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