PIMD – Processing Instructions for Markdown
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README.md

PIMD

Build status (Travis CI) Dependency status (Greenkeeper) JavaScript Style Guide

Processing Instructions for MarkDown.

PIMD will be the base for the JavaScript version of LivingStyleGuide – an API to extend Markdown by DOM manipulations as known from the browsers.

Main targets

  • Easy to use in JavaScript projects – in build tools and within the browser
  • Focus on extendibility: The DOM tree known from the browser will be the main API
  • Compliance with the CommonMark specs – Markdown files will render perfectly on GitHub; all additional commands will be CommanMark compliant and won’t leave ugly artifacts when used in README.md files on GitHub

RailsGirls Summer of Code

This project is as part of LivingStyleGuide chosen for the RailsGirls Summer of Code 2018: Our team is @artnerdnet and @dianavile


Setup

npm install --save pimd

Usage

Render inline

const { Document } = require("pimd")
const markdown = `
# Headline
`
const doc = new Document(markdown)
console.log(doc.render())

Result:

<h1>
  Headline
</h1>

Render document

const { Document } = require("pimd")
const markdown = `
# Headline
`
const doc = new Document(markdown)
doc.renderDocument().then(html => {
  console.log(html)
})

Result:

<html>
  <head>
    <title>Headline</title>
  </head>
  <body>
    <h1>
      Headline
    </h1>
  </body>
</html>

Plugins

Plugins unleash the full power of PIMD. The official plugins offer functionality to create living style guides and to improve code documentation in general.

  • Classes: Add classes to code blocks or other elements for easy additional styling
  • ID: Add an ID to code blocks or other elements for easily accessing elements in the HTML preview via JavaScript to bring code examples to live
  • Preview: Add an HTML preview to code blocks for pattern libraries/living style guides
  • Highlight: Visually highlight important parts of code blocks in different background colors
  • Showmore: Hide less important parts of code blocks
  • Prism: Syntax highlighting with PrismJS
  • HTML injector: a plugin to create new plugins that manipulate the code blocks (already used by Highlight and Showmore)

Extending

Output generated data with JavaScript

PIMD extends Markdown with Processing Instructions known from XML. This is compliant with the CommonMark specs.

const { Document } = require("pimd")
const Config = require("pimd/lib/config")

const config = new Config()
config.commands["year"] = () => new Date().getFullYear()

const markdown = `
# Year <?year?>
`
const doc = new Document(markdown, config)
console.log(doc.render())

Result:

<h1>Year 2018</h1>

Accessing the DOM

PIMD uses the DOM internally to provide a well-known API to its users.

const { Document } = require("pimd")
const Config = require("pimd/lib/config")

const config = new Config()
config.commands["important"] = context => {
  context.element.style.background = "yellow"
}

const markdown = `
# Headline <?important?>
`
const doc = new Document(markdown, config)
console.log(doc.render())

Result:

<h1 style="background: yellow">Headline</h1>

Writing plugins

const { Document } = require("pimd")
const Config = require("pimd/lib/config")

const myPlugin = function(config) {
  config.addInfoStringCommand("info", { types: ["string"] }, function(text) {
    const div = this.renderer.dom.window.document.createElement("div")
    div.textContent = text
    this.element.appendChild(div)
  })
}

const config = new Config()
config.use(myPlugin)

const markdown = `
~~~html +info="Hello world!"
<p>Test</p>
~~~
`
const doc = new Document(markdown, config)
console.log(doc.render())

Result:

<div class="pimd-example">
  <div class="pimd-code">
    <pre>
      <code class="lang-html">
        &lt;p&gt;Test&lt;/p&gt;
      </code>
    </pre>
  </div>
  <div>Hello world!</div>
</div>

Tip: Check out the source code of PIMD’s official plugins for further inspiration.


Coding style

PIMD uses the Prettier style for all supported documents. To save the environment, semicolons are not required.


Copyright

Copyright 2018++ Nico Hagenburger. See MIT-LICENSE for details. Get in touch with @hagenburger on Twitter or open an issue.