A Metalsmith plugin that adds Twitter Card meta tags to enable Twitter share rich snippets. Plugin supports all twitter card types and validates file metadata to have all required properties.

$ npm install --save-dev metalsmith-twitter-card

Place metalsmith-twitter-card plugin after html files generation, for example after metalsmith-layouts.

const Metalsmith  = require('metalsmith');
const twitterCard = require('metalsmith-twitter-card');

Metalsmith(__dirname)
  .use(twitterCard({
    siteurl: 'my-site.com'
  }));

To enable twitter tags generation add twitter to frontmatter with required sub-properties. Or you can just set twitter: true to use default defined in plugin options. Properties cound be just a string value, css selector (only class and id supported), or metadata property name. Example:

---
title: Hello World
description: My pretty description.
twitter:
  card: summary            // Sets card type to `summary`
  site: '@myaccount'       // Sets twitter account to `@myaccount`
  title: '#page-title'     // Will look for element with id `page-title`
                           // and take its text content as twitter card title.
  description: description // Will look for a description property in file frontmatter,
                           // if nothing founded in it, will look for this property in plugin options.
---

To disable twitter tags generation for particular file just ommit twitter property in frontmatter.

You can pass any twitter card properties to plugin to set default values. If file contain properties, it will use properties from file, override defaults. Example:

const Metalsmith  = require('metalsmith');
const twitterCard = require('metalsmith-twitter-card');

Metalsmith(__dirname)
  .use(twitterCard({
    siteurl: 'my-site.com',
    card: 'summary_large_image', // Sets default card type.
    site: '@myaccount',          // Sets default twitter username.
    title: 'title',              // By default will use title property from file metadata as twitter card title.
    description: 'description'   // By default will use description property
                                 // from file metadata as twitter card description.
  }));

In file you can override defaults, for example:

 ---
 title: Hello World
 description: My pretty description.
 twitter:
   card: summary            // Will override default card type `summary_large_image` with `summary`
   site: '@another-account' // Will override default twitter account `@myaccount` with `@another-account`
 ---

Type: String

Default: ''

Your site url, used to generate absolute path for images.

You can also use the plugin with the Metalsmith CLI by adding a key to your metalsmith.json file:

{
  "plugins": {
    "metalsmith-twitter-card": {
      "siteurl": "my-site.com"
    }
  }
}

MIT