README.md
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# Neco
Neco is a NEo COmmand pattern library for Ruby.
## Installation
Add this line to your application's Gemfile:
```ruby
gem 'neco'
```
And then execute:
$ bundle
Or install it yourself as:
$ gem install neco
## Usage
Include `Neco::Command` module and define your command with DSLs like below:
```ruby
class Foo
include Neco::Command
validates do |name:|
name == 'Tama'
end
main do |name:|
puts "Hello, #{name}!"
end
end
Foo.call(name: 'Tama') # => 'Hello, Tama!'
```
Here, `validates` block defines validations and `main` block defines main logic for the command (simple, right?)
You can also compose multiple commands into one command using `Neco::Composition` module. Neco automatically triggers rollbacks when one of the commands raises an exception.
```ruby
class Command1
include Neco::Command
main do
set :cat_name, 'Tama'
end
rollback do
puts 'Rolling back Command1!'
end
end
class Command2
include Neco::Command
main do |cat_name:|
puts "Hello, #{cat_name}!"
end
rollback do
puts 'Rolling back Command2!'
end
end
class Command3
include Neco::Command
# Unused block argument
main do |cat_name:|
raise 'OMG!!!'
end
end
class Bar
include Neco::Composition
composes Command1, Command2, Command3
end
Bar.call
# => 'Hello, Tama!'
# => 'Rolling back Command2!'
# => 'Rolling back Command1!'
```
See `examples` directory for details.
## Development
After checking out the repo, run `bin/setup` to install dependencies. Then, run `rake test` 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](https://rubygems.org).
## Contributing
Bug reports and pull requests are welcome on GitHub at https://github.com/okuramasafumi/neco. This project is intended to be a safe, welcoming space for collaboration, and contributors are expected to adhere to the [Contributor Covenant](http://contributor-covenant.org) code of conduct.
## License
The gem is available as open source under the terms of the [MIT License](https://opensource.org/licenses/MIT).
## Code of Conduct
Everyone interacting in the Neco project’s codebases, issue trackers, chat rooms and mailing lists is expected to follow the [code of conduct](https://github.com/okuramasafumi/neco/blob/master/CODE_OF_CONDUCT.md).