To do: write some stuff about why neptune is cool.
\n\n\n\n```\n\n### Example: inferring metadata\n\nSome metadata can be automatically gathered, either by extracting it from the\ndocument, or by accessing the file system or Git.\nThis is done by other plugins (see [config][]) which “infer” that metadata and\nstore their results on `file.data.meta`, which this plugin then looks at.\n\nTaking this readme as an example and running the following code within this\nrepo:\n\n```js\nimport remarkParse from 'remark-parse'\nimport remarkRehype from 'remark-rehype'\nimport rehypeDocument from 'rehype-document'\nimport rehypeInferTitleMeta from 'rehype-infer-title-meta'\nimport rehypeInferDescriptionMeta from 'rehype-infer-description-meta'\nimport rehypeInferReadingTimeMeta from 'rehype-infer-reading-time-meta'\nimport rehypeMeta from 'rehype-meta'\nimport rehypeStringify from 'rehype-stringify'\nimport {read} from 'to-vfile'\nimport {unified} from 'unified'\nimport unifiedInferGitMeta from 'unified-infer-git-meta'\n\nconst file = await unified()\n .use(remarkParse)\n .use(unifiedInferGitMeta) // Find published, modified, and authors in Git.\n .use(remarkRehype)\n .use(rehypeDocument)\n .use(rehypeInferTitleMeta) // Find the main title.\n .use(rehypeInferDescriptionMeta, {truncateSize: 64}) // Find the description.\n .use(rehypeInferReadingTimeMeta) // Estimate reading time.\n .use(rehypeMeta, {og: true, twitter: true, copyright: true})\n .use(rehypeStringify)\n .process(await read('readme.md'))\n\nconsole.log(String(file))\n```\n\nYields:\n\n```html\n\n\n\n\n