pmuens/markdown-magic

Automatically keep markdown files up to date from source code or via external sources.

Markdown Magic

✨ Add a little magic to your markdown ✨

About

Markdown magic uses comment blocks in markdown files to automatically sync or transform it's contents. These code comments are hidden in markdown and when viewed as HTML.

• Automatically keep markdown files up to date from local or remote code sources
• Transform markdown content with custom transform functions
• Render markdown with any template engine
• Automatically generate a table of contents

This README.md is generated with markdown-magic view the raw file to see how.

Video demo • Example Repo

Table of Contents

Click to expand

- [About](#about) - [Install](#install) - [Usage](#usage) - [CLI Usage](#cli-usage) * [API](#api) * [Configuration Options](#configuration-options) - [Transforms](#transforms) * [`CODE`](#code) * [`REMOTE`](#remote) * [`TOC`](#toc) - [Plugins](#plugins) - [Custom Transforms](#custom-transforms) - [Plugin Example](#plugin-example) - [Other usage examples](#other-usage-examples) - [Custom Transform Demo](#custom-transform-demo) - [Prior Art](#prior-art)

Install

npm install markdown-magic --save-dev

Usage

import markdownMagic from 'markdown-magic'
import path from 'path'

const markdownPath = path.join(__dirname, 'README.md')
markdownMagic(markdownPath)

CLI Usage

You can use markdown-magic as a CLI command. This is useful for adding the package quickly to your package.json npm scripts

markdown --help
# or
md-magic

Run markdown --help to see all available CLI options

CLI usage example with options

markdown --path *.md --config ./config.file.js

/**
 * CLI config example
 * markdown.config.js as default name
 */
module.exports = {
  transforms: {
    /* Match AUTO-GENERATED-CONTENT (LOLZ) */
    LOLZ(content, options) {
      return `This section was generated by the cli config markdown.config.js file`
    }
  },
  callback: function () {
    console.log('done')
  }
}

API

markdownMagic(filePath, config, callback)

• filePaths - String or Array - Path or glob pattern. Uses globby patterns
• config - See configuration options below
• callback - callback to run after markdown updates

Configuration Options

transforms - Object - (optional) Custom commands to transform block contents, see transforms & custom transforms sections below.

outputDir - String - (optional) Change output path of new content. Default behavior is replacing the original file

matchWord - String - (optional) Comment pattern to look for & replace inner contents. Default AUTO-GENERATED-CONTENT

DEBUG - Boolean - (optional) set debug flag to true to inspect the process

Transforms

Markdown Magic comes with a couple of built in transforms for you to use or you can extend it with your own transforms. See 'Custom Transforms' below.

CODE

Get code from file or URL and put in markdown

Options:

• src: The relative path to the code to pull in, or the URL where the raw code lives
• syntax (optional): Syntax will be inferred by fileType if not specified

Example:

<-- MATCHWORD:START (CODE:src=./relative/path/to/code.js) -->
This content will be dynamically replaced with code from the file
<-- MATCHWORD:END -->

---

REMOTE

Get any remote Data and put in markdown

Options:

• url: The URL of the remote content to pull in

Example:

<-- MATCHWORD:START (REMOTE:url=http://url-to-raw-md.md) -->
This content will be dynamically replace from the remote url
<-- MATCHWORD:END -->

---

TOC

Generate table of contents from markdown file

Options:

• firsth1 - Boolean - (optional): Show first h1 of doc in table of contents. Default false
• collapse - Boolean - (optional): Collapse the table of contents in a detail accordian. Default false
• collapseText - string - (optional): Text the toc accordian summary
• excludeText - string - (optional): Text to exclude in the table of contents. Default Table of Contents

Example:

<-- MATCHWORD:START (TOC) -->
toc will be generated here
<-- MATCHWORD:END -->

---

Plugins

• wordcount - Add wordcount to markdown files
• github-contributors - List out the contributors of a given repository
• directory-tree - Add directory tree to markdown files
• install-command - Add install command to markdown files with peerDependencies included
• subpackage-list - Add list of all subpackages (great for projects that use Lerna)

Custom Transforms

Markdown Magic is extendable via plugins.

Plugins allow developers to add new transforms, use different rendering engines or any other logic you might want in config.commands.

Plugins run in order of registration.

The below code is used to generate this markdown file via the plugin system.

const fs = require('fs')
const path = require('path')
const execSync = require('child_process').execSync
const markdownMagic = require('../index') // 'markdown-magic'

const config = {
  transforms: {
    /* Match AUTO-GENERATED-CONTENT (customTransform:optionOne=hi&optionOne=DUDE) */
    customTransform(content, options) {
      console.log('original innerContent', content)
      console.log(options) // { optionOne: hi, optionOne: DUDE}
      return `This will replace all the contents of inside the comment ${options.optionOne}`
    },
    /* Match AUTO-GENERATED-CONTENT (RENDERDOCS:path=../file.js) */
    RENDERDOCS(content, options) {
      const contents = fs.readFileSync(options.path, 'utf8')
      const docBlocs = require('dox').parseComments(contents, { raw: true, skipSingleStar: true })
      let updatedContent = ''
      docBlocs.forEach((data) => {
        updatedContent += `${data.description.full}\n\n`
      })
      return updatedContent.replace(/^\s+|\s+$/g, '')
    },
    /* Match AUTO-GENERATED-CONTENT (pluginExample) */
    pluginExample: require('./plugin-example')({ addNewLine: true }),
    // count: require('markdown-magic-wordcount'),
    // github: require('markdown-magic-github-contributors')
  }
}

/* This example callback automatically updates Readme.md and commits the changes */
const callback = function autoGitCommit(err, output) {
  // output is array of file information
  output.forEach(function(data) {
    const mdPath = data.outputFilePath
    const gitAdd = execSync(`git add ${mdPath}`, {}, (error) => {
      if (error) console.warn(error)
      console.log('git add complete')
      const msg = `${mdPath} automatically updated by markdown-magic`
      const gitCommitCommand = `git commit -m '${msg}' --no-verify`
      execSync(gitCommitCommand, {}, (err) => {
        if (err) console.warn(err)
        console.log('git commit automatically ran. Push up your changes!')
      })
    })
  })
}

const markdownPath = path.join(__dirname, '..', 'README.md')
markdownMagic(markdownPath, config, callback)

Plugin Example

Plugins must return a transform function with the following signature.

return function myCustomTransform (content, options)

/* Custom Transform Plugin example */
const merge = require('deepmerge')
module.exports = function customPlugin(pluginOptions) {
  // set plugin defaults
  const defaultOptions = {
    addNewLine: false
  }
  const userOptions = pluginOptions || {}
  const pluginConfig = merge(defaultOptions, userOptions)
  // return the transform function
  return function myCustomTransform (content, options) {
    const newLine = (pluginConfig.addNewLine) ? '\n' : ''
    const updatedContent = content + newLine
    return updatedContent
  }
}

View the raw file file and run npm run docs to see this plugin run

This content is altered by the pluginExample plugin registered in examples/generate-readme.js

Other usage examples

• Serverless Plugin Repo this example takes a json file and converts it into a github flavored markdown table

Custom Transform Demo

View the raw source of this README.md file to see the comment block and see how the customTransform function in examples/generate-readme.js works

This will replace all the contents of inside the comment DUDE

Prior Art

This was inspired by Kent C Dodds and jfmengels's all contributors cli project.

This section was generated by the cli config markdown.config.js file