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unified plugin to infer file metadata from Git of a document.

Contents

What is this?

This package is a unified plugin to infer when content was first published, last modified, and who contributed to it, from Git.

unified is a project that transforms content with abstract syntax trees (ASTs). vfile is the virtual file interface used in unified. This is a unified plugin that extracts metadata from Git and exposes it on the vfile.

When should I use this?

This plugin is particularly useful in combination with rehype-meta. When both are used together, output such as the following is generated:

<meta name="copyright" content="© 2019 Jane">
<meta name="author" content="Jane">
<!-- … -->
<meta property="article:published_time" content="2019-12-02T10:00:00.000Z">
<meta property="article:modified_time" content="2019-12-03T19:13:00.000Z">

The downside is that Git might be sparesely cloned when building a website, meaning that only the last commit is available, which means that this plugin cannot find all data.

Install

This package is ESM only. In Node.js (version 16+), install with npm:

npm install unified-infer-git-meta

In Deno with esm.sh:

import unifiedInferGitMeta from 'https://esm.sh/unified-infer-git-meta@2'

In browsers with esm.sh:

<script type="module">
  import unifiedInferGitMeta from 'https://esm.sh/unified-infer-git-meta@2?bundle'
</script>

Use

Say our module example.js looks as follows:

import rehypeDocument from 'rehype-document'
import rehypeFormat from 'rehype-format'
import rehypeMeta from 'rehype-meta'
import rehypeStringify from 'rehype-stringify'
import remarkParse from 'remark-parse'
import remarkRehype from 'remark-rehype'
import {read} from 'to-vfile'
import {unified} from 'unified'
import unifiedInferGitMeta from 'unified-infer-git-meta'

const file = await unified()
  .use(remarkParse)
  .use(unifiedInferGitMeta)
  .use(remarkRehype)
  .use(rehypeDocument)
  .use(rehypeMeta, {
    // Published and modified are only added if these two are also defined:
    og: true,
    type: 'article'
  })
  .use(rehypeFormat)
  .use(rehypeStringify)
  .process(await read('readme.md'))

console.log(file.data)
console.log(String(file))

…now running node example.js yields:

{
  meta: {
    author: 'Titus Wormer',
    modified: new Date('2023-08-24T10:13:50.000Z'),
    published: new Date('2021-09-09T11:22:32.000Z')
  }
}

<!doctype html>
<html lang="en">
  <head>
    <meta charset="utf-8">
    <title>readme</title>
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <meta name="author" content="Titus Wormer">
    <meta property="og:type" content="article">
    <meta property="article:published_time" content="2021-09-09T11:22:32.000Z">
    <meta property="article:modified_time" content="2023-08-24T10:13:50.000Z">
  </head>
  …

API

This package exports no identifiers. The default export is unifiedInferGitMeta.

unified().use(unifiedInferGitMeta, options?)

Plugin to infer some meta from Git.

This plugin sets file.data.meta.published to the date a file was first committed, file.data.meta.modified to the date a file was last committed, and file.data.meta.author to an abbreviated list of top authors of the file.

Parameters
Returns

Transform (Transformer).

Format

Format function (TypeScript type).

Parameters
Returns

Formatted authors (string).

Options

Configuration (TypeScript type).

Fields

Types

This package is fully typed with TypeScript. It exports the additional types Format and Options.

It also registers the file.data.meta fields with vfile. If you’re working with the file, make sure to import this plugin somewhere in your types, as that registers the new fields on the file.

/**
 * @typedef {import('unified-infer-git-meta')}
 */

import {VFile} from 'vfile'

const file = new VFile()

console.log(file.data.meta.published) //=> TS now knows that this is a `Date?`.

Compatibility

Projects maintained by the unified collective are compatible with maintained versions of Node.js.

When we cut a new major release, we drop support for unmaintained versions of Node. This means we try to keep the current release line, unified-infer-git-meta@^2, compatible with Node.js 16.

Related

Contribute

See contributing.md in unifiedjs/.github for ways to get started. See support.md for ways to get help.

This project has a code of conduct. By interacting with this repository, organization, or community you agree to abide by its terms.

License

MIT © Titus Wormer

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