docmatter

Battle tested SSG front matter parser. Extracted from DocPad. Delimiter lines have 3+ of the same character (such as /*** and ***/) allowing front matters to work with the syntax highlighting of your code editor. Supports custom parsers, e.g. --- cson. Parsers are handled externally.

Usage

docmatter is designed to be functional yet minimal, default parser as well as parsing of the headers are handled by you

const docmatter = require('docmatter')
const yamljs = require('yamljs')

function parse (input) {
    const matter = docmatter(input)

    // if no front matter: {content}
    if (!matter.header) return { content: matter.content.trim() }

    // if front matter: {delimiter, parser, header, body, content}
    let data = null
    switch (matter.parser) {
        case 'json':
            if (matter.header[0] === '{' && matter.header[matter.header.length - 1] === '}') {
                data = JSON.parse(matter.header)
            }
            else {
                data = JSON.parse(`{${matter.header}}`)
            }
            break;


        case 'yaml':
        default:
            data = yamljs.parse(
                matter.header.replace(/\t/g, '    ')  // YAML doesn't support tabs that well
            )
            break;
    }
    return { data, content: matter.body.trim() }
}


// no content and only front matter
console.log(parse(`
---
title: Hello World
---
`))
// => { data: { title: 'Hello World' }, content: '' }


// markdown content with default front matter
console.log(parse(`
---
title: Hello World
---

**hello world**
`))
// => { data: { title: 'Hello World' }, content: '**hello world**' }


// markdown content with json front matter
console.log(parse(`
--- json
"title": "Hello World"
---

**hello world**
`))
// => { data: { title: 'Hello World' }, content: '**hello world**' }


// markdown content with no front matter
console.log(parse(`
**hello world**
`))
// => { content: '**hello world**' }


// javascript content with default front matter
console.log(parse(`
/***
minify: true
***/

alert('Hello World')
`))
// => { data: { minify: true }, content: 'alert(\'Hello World\')' }

Install

npm

• Install: npm install --save docmatter
• Import: import * as pkg from ('docmatter')
• Require: const pkg = require('docmatter')

Editions

This package is published with the following editions:

• docmatter/source/index.coffee is CoffeeScript source code with Require for modules
• docmatter aliases docmatter/edition-esnext/index.js
• docmatter/edition-esnext/index.js is CoffeeScript compiled for Node.js 6 || 8 || 10 || 12 || 14 || 16 || 18 || 20 || 21 with Require for modules

History

Discover the release history by heading on over to the HISTORY.md file.

Backers

Code

Discover how to contribute via the CONTRIBUTING.md file.

Authors

• Benjamin Lupton — Accelerating collaborative wisdom.

Maintainers

• Benjamin Lupton — Accelerating collaborative wisdom.

Contributors

• Benjamin Lupton — view contributions

Finances

Sponsors

• Andrew Nesbitt — Software engineer and researcher
• Balsa — We're Balsa, and we're building tools for builders.
• Codecov — Empower developers with tools to improve code quality and testing.
• Poonacha Medappa
• Rob Morris
• Sentry — Real-time crash reporting for your web apps, mobile apps, and games.
• Syntax — Syntax Podcast

Donors

• Andrew Nesbitt
• Armen Mkrtchian
• Balsa
• Chad
• Codecov
• dr.dimitru
• Elliott Ditman
• entroniq
• GitHub
• Hunter Beast
• Jean-Luc Geering
• Michael Duane Mooring
• Michael Harry Scepaniak
• Mohammed Shah
• Mr. Henry
• Nermal
• Pleo
• Poonacha Medappa
• Rob Morris
• Robert de Forest
• Sentry
• ServieJS
• Skunk Team
• Syntax
• WriterJohnBuck

License

Unless stated otherwise all works are:

• Copyright © Benjamin Lupton

and licensed under:

• Artistic License 2.0