gemlist

= Gemlist

I built gemlist because I wanted a programmatic way to do what http://github.com/samphippen/dundler[dundler] does:

. Figure out what gems would be installed by a given project . Give each one a separate RUN gem install $name -v $version line in a Dockerfile

I want this capability because a containerization tool I work on builds Docker images from template-generated Dockerfiles, and it'd be nice to not have to wait for nokogiri to re-install every time we need to re-containerize a Rails application (as an example).

Given this, I have a very specific set of assumptions:

• I don't care about local (:path \=> \...) dependencies.
• I don't care about git (:git \=> \...) dependencies.
• I do care about being able to include or exclude bundle groups.
• I don't actually want to install gems, just get a list of them.
• I have local filesystem access to the Gemfile and Gemfile.lock of the target project.

If these assumptions line up with a problem you're trying to solve, then I hope this saves you time and energy! And, if it does, feel free to contact me, because I'd be interested in hearing about the super-cool thing you're doing with this.

== Use

require 'gemlist'

gemlist = Gemlist.new("/path/to/project")

gemlist.gems.each do |gem|
  puts "RUN gem install #{gem.name} -v #{gem.version}"
end

If you want to exclude gem groups, you can do that:

gemlist = Gemlist.new("/path/to/project", without: [:development, :test])

If you want to include addition gem groups, you can do that too:

gemlist = Gemlist.new("/path/to/project", with: [:assets])

== Installation

Add this line to your application's Gemfile:

gem 'gemlist'

And then execute:

$ bundle

Or install it yourself as:

$ gem install gemlist

== 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 link:https://rubygems.org[rubygems.org].

== Contributing

Bug reports and pull requests are welcome on GitHub at https://github.com/yarmiganosca/gemlist. This project is intended to be a safe, welcoming space for collaboration, and contributors are expected to adhere to the link:http://contributor-covenant.org[Contributer Covenant] code of conduct.

== License

The gem is available as open source under the terms of the link:http://opensource.org/licenses/MIT[MIT License].