gem 'habu'

# user.rb
User = Struct.new(:name)

# new_user_service.rb
class NewUserService
  @Inject
  def initialize(user_repository)
    @user_repository = user_repository
  end

  def call(*params)
    @user_repository.new(*params)
  end
end

# app.rb
require 'habu/setup'
require_relative 'user'
require_relative 'new_user_service'

# Create a new container
container = Habu::Container.new

# Register user_repository service by passing the block as service factory
container[:user_repository] { User }

# You can access to registered service by calling the method of Container#factory
container.factory.user_repository.new("hanachin")
# => #<struct User name="hanachin">

# Also you can use Container#factory as refinements for shorthand
using container.factory.to_refinements
user_repository.new("hanachin")
# => #<struct User name="hanachin">

# Call Habu::Container#new to get instance
new_user = container.new(NewUserService).call("hanachin")
# => #<struct User name="hanachin">

# Factory block take a container as argument
container[:new_user] do |c|
  # You can get the service object by calling Container#[](service_name)
  NewUserService.new(c[:user_repository])
end
new_user = container[:new_user].call("hanachin")
# => #<struct User name="hanachin">

# Using container as refinements for shorthand for container.new
using container.to_refinements
new_user = NewUserService.new.call("hanachin")
# => #<struct User name="hanachin">