Minimus

Minimalistic predictable sequential state machine for Ruby. If you want something really simple.

Add this line to your application's Gemfile:

gem 'minimus'

And then execute:

$ bundle

Or install it yourself as:

$ gem install minimus

All you need to do is to provide a list of states, the first one will be the default initial state.

state = Minimus.new(:new, :updated, :destroyed)
state.initial_state
=> :new
state.current_state
=> :new
state.move(:destroyed)
=> false
state.move(:updated)
state.current_state
=> :updated
state.move!(:illegal)
=> Minimus::TransitionError
state.move!(:destroyed)
state.current_state
=> :destroyed

You can pass blocks as callbacks

state.move(:updated) do
  puts "Callback"
end

If you want to be slightly more unpredictable you can define your transitions:

state.can(:new, possible: :destroyed)
state.current_state
=> :new
state.move(:destroyed)
state.current_state
=> :destroyed

You can also supply an array of possibilities:

state.can(:new, possible: [:created, :destroyed])

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.

Bug reports and pull requests are welcome on GitHub at https://github.com/wizardone/minimus. 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.

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

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