can_use

🤔Can I use this feature? Hmm, let me see.

CanUse is a minimalist feature toggle/flag for crystal, based on yaml file.

Installation

1. Add the dependency to your shard.yml:

dependencies:
  can_use:
    github: rodrigopinto/can_use

2. Run shards install

Usage

1. Require the library on your code base.

require "can_use"

2. Create a file with the features toggle definitions. We suggest to name it as featutes.yaml, but it is up to you.

   Note: The defaults block is mandatory, as it will be used as fallback when values are not defined on the environment set on configuration. Example:

defaults:
  new_payment_flow: false
  rating_service: false

development:
  new_payment_flow: true
  rating_service: false

your_environment:
  new_payment_flow: true

3. Configure the environment and the path to the yaml.

CanUse.configure do |config|
  config.file = "path/to/features.yaml"
  config.environment = "your_environment"
end

4. Verify if a feature is toggled on/off

if CanUse.feature?("new_payment_flow")
  # do_something
end

5. Enabling or Disabling a feature is simple as

Enabling

CanUse.feature?("feature_a") # => false

CanUse.enable("feature_a") # => true

CanUse.feature?("feature_a") # => true

Disabling

CanUse.feature?("feature_b") # => true

CanUse.disable("feature_b") # => false

CanUse.feature?("feature_b") # => false

Development

1. Install the dependencies.

$ shards install

2. Implement and test your changes.

$ crystal spec

3. Run fomart tool to verify code style.

$ crystal tool format

TODO

• Allows ENVIRONMENT variables to set/override a value for a key.

Contributing

1. Fork it (https://github.com/rodrigopinto/can_use/fork)
2. Create your feature branch (git checkout -b my-new-feature)
3. Commit your changes (git commit -am 'Add some feature')
4. Push to the branch (git push origin my-new-feature)
5. Create a new Pull Request

Contributors

• Rodrigo Pinto - creator and maintainer

Credits

This shard was initially inspired by can_do.