Liner

Lay a liner for your Ruby classes. Liner is designed to enhance simple classes with some common idioms.

Usage

You can setup a Liner based class in any of these equivalent ways:

Engine = Liner.new(:layout, :fuel)

class Engine < Liner.new(:layout, :fuel)
end

class Engine
  liner :layout, :fuel
end

Your new class comes with an initializer that takes values in the order you defined them.

e = Engine.new('V6', 'gasoline')
# => #<Engine layout="V6", fuel="gasoline">

Or, you can initialize with a hash if you prefer.

e = Engine.new(layout: 'V8', fuel: "gasoline")
# => #<Engine layout="V8", fuel="gasoline">

Attribute getters and setters are built in.

e.fuel            # => "gasoline"
e.fuel = "diesel" # => "diesel"

Attributes are accessible via hash style lookup too.

e[:layout]        # => "V8"
e[:layout] = "V6" # => "V6"
e[:foo] = "Bar"   # => ArgumentError: Invalid liner attribute: 'foo'

Equality methods are also availble.

e.eql? Engine.new(layout: 'I4')               # => false
e == Engine.new(layout: 'V6', fuel: 'diesel') # => true

Add this line to your application's Gemfile:

gem 'liner'

And then execute:

$ bundle

Or install it yourself as:

$ gem install liner