Jekyll Purgecss

A Jekyll plugin for Purgecss.

Installation

Add this line to your application's Gemfile:

gem 'jekyll-purgecss'

And then add this line to your application's _config.yml:

# _config.yml

plugins:
  - jekyll-purgecss

css_dir: "<css_dir>" # defaults to "css"

jekyll-purgecss only runs in production, so make sure that JEKYLL_ENV=production on the server where you build your site.

Usage

Make sure you have purgecss installed and has its binary located at ./node_modules/.bin/purgecss.

Add your Purgecss configuration to a purgecss.config.js file in the root of your repository.

// purgecss.config.js

module.exports = {
  // These are the files that Purgecss will search through
  content: ["./_site/**/*.html"],

  // These are the stylesheets that will be subjected to the purge
  css: ["./_site/css/site.css"] 
};

Tailwind CSS

If you are using Tailwind CSS, you'll need to add a custom extractor. More can be read on the Tailwind documentation.

module.exports = {
  content: ["./_site/**/*.html"],
  css: ["./_site/css/site.css"],

  // Tailwind CSS config
  defaultExtractor: content => content.match(/[\w-/:]+(?<!:)/g) || []
};

Deployment

Please note that this plugin isn't supported by GitHub Pages, which means by default you are not able to use it, when you are hosting your site at GitHub Pages.

However if switching to another hosting platform (e.g.Netlify) is nothing you want to do, there's the option to perform the build process via GitHub Actions.

To do that, you need to create a yml-workflow-file inside .github/workflows of your repository that represents your build process. This could look like the following:

name: Build and deploy Jekyll to GitHub Pages

on:
  push:
    branches:
      - master

jobs:
  github-pages:
    runs-on: ubuntu-latest

    steps:
      - name: Checkout
        uses: actions/checkout@v2
      # Install Ruby to be able to build the site using Jekyll
      - name: Setup Ruby
        uses: ruby/setup-ruby@v1
        with:
          ruby-version: 2.7
      # Install Node as this is needed for PurgeCSS
      - name: Setup Node
        uses: actions/setup-node@v1
        with:
          node-version: '14'
      # Install PurgeCSS (needs to be in your package.json)
      - run: npm install
      # Build site
      - name: Install dependencies & Build Site
        uses: limjh16/jekyll-action-ts@v2
        with:
          enable_cache: true
      # Push the compiled _site-folder as branch into your GitHub repository
      - name: Deploy to GitHub Pages
        uses: peaceiris/actions-gh-pages@v3
        with:
          github_token: ${{ secrets.GITHUB_TOKEN }}
          publish_dir: ./_site

See:

• https://github.com/limjh16/jekyll-action-ts/ for more details about the GitHub Action compiling your site

Development

After checking out the repo, run bin/setup to install dependencies. Then, run rake spec to run the tests. You can also run bin/console for an interactive prompt that will allow you to experiment.

To install this gem onto your local machine, run bundle exec rake install. To release a new version, update the version number in version.rb, and then run bundle exec rake release, which will create a git tag for the version, push git commits and tags, and push the .gem file to rubygems.org.

Contributing

Bug reports and pull requests are welcome on GitHub at https://github.com/mhanberg/jekyll-purgecss. This project is intended to be a safe, welcoming space for collaboration, and contributors are expected to adhere to the Contributor Covenant code of conduct.

License

The gem is available as open source under the terms of the MIT License.

Code of Conduct

Everyone interacting in the Jekyll Purgecss project’s codebases, issue trackers, chat rooms and mailing lists is expected to follow the code of conduct.