module UsefulDuration

# File lib/useful_duration.rb, line 9
def self.included(base)
  # Some nice - built in durations
  useful_duration :bravehearts,         10620
  useful_duration :in_a_gadda_da_vidas,  1023
  useful_duration :doctor_zhivagos,     11820
end

# File lib/useful_duration.rb, line 16
def useful_duration name, value
  # Send a `define_method` to Numeric class
  Numeric.send(:define_method, name) do
    ActiveSupport::Duration.new(self * value, [[:seconds, self * value]])
  end

  # Alias the "singular" method with it
  # For example, useful_duration :fortnights, 1209600
  #   will create #fortnights and #fortnight
  Numeric.send(:alias_method, singular_method(name), name)
end

# File lib/useful_duration.rb, line 31
def singular_method name
  name.to_s.singularize.to_sym
end