img-lint will help to keep your webapp from serving heavy and not optimized images. It's a zero-dependencies Ruby gem that will scan specified folders for images with size above a certain threshold. It could be run manually or easily integrated into CI.

gem install img-lint

or add it to your Gemfile and run bundle install:

gem 'img-lint', require: false

Run img-lint in your console to lint images in the current folder or pass some arguments like so:

img-lint -p /path/to/project -f "jpg,png" -m 30

Run img-lint install from the command line to generate .img-lint.yml config file:

max_file_size: 150 # Kb
image_formats: "jpg,png,gif"
exclude:
  - "tmp/**/**"
  - "vendor/**/**"

Configuration from .img-lint.yml will extend the default configuration.

To execute scss-lint via a Rake task, add the following to your Rakefile:

require "img_lint/rake_task"

IMGLint::RakeTask.new

Make sure to specify your config when running img-lint with Rake or in CI mode.

That would be awesome to see you involved: Try out img-lint, give feedback via email or simply open an issue. If you're opening a PR, try to add some specs, so we keep the project stable:

bundle exec rspec

By participating, you are expected to honor Code of Conduct.

This project is released under the MIT License.