Add when alias

README.md

@@ -32,7 +32,7 @@ bus = Bus.new([
 class DonationsController # < ActionController::Base
   def create
     listener = bus.
-      on(:donation_created) {|donation| send_user_to_payment_gateway(donation) }.
+      on(:donation_created) {|donation| send_user_to_payment_gateway(donation) }. # NOTE the dot!
       on(:donation_invalid) {|donation| render donation.errors, status: :bad_request }
 
     # or
@@ -46,7 +46,7 @@ class DonationsController # < ActionController::Base
 
     # or
 
-    DonationService.new.add_donation(current_user, params[:donation], bus.on(
+    DonationService.new.add_donation(current_user, params[:donation], bus.when(
       donation_created: ->(donation) { send_user_to_payment_gateway(donation) },
       donation_invalid: ->(donation) { render donation.errors, status: :bad_request }
     ))
@@ -61,10 +61,6 @@ end
 
 # service
 class DonationService
-  def initialize(options={})
-    @donation_class = options.fetch(:donation_class) { Donation }
-  end
-
   def add_donation(donor, donation_attributes, listener)
     donation = donor.donations.build(donation_attributes)
     if donation.save

lib/bus.rb

@@ -16,6 +16,8 @@ def on(event_or_hash, &block)
     self.class.new(@listeners + listeners)
   end
 
+  alias :when :on
+
   def method_missing(method_name, *args)
     responded = false
     @listeners.each do |listener|

lib/bus/version.rb

@@ -1,3 +1,3 @@
 class Bus
-  VERSION = '0.0.2'
+  VERSION = '0.0.3'
 end

spec/bus_spec.rb

@@ -5,7 +5,7 @@
   let (:listener) { double }
 
   it 'calls attached listener' do
-    bus = described_class.new.attach(listener)
+    bus = subject.attach(listener)
 
     expect(listener).to receive(:event_fired)
 
@@ -58,6 +58,14 @@
     bus.event_fired(:args)
   end
 
+  it 'aliases on and when methods' do
+    bus = subject.when(:event_fired) {|args| listener.call(args)} # event_fired { do stuff }
+
+    expect(listener).to receive(:call).with(:args)
+
+    bus.event_fired(:args)
+  end
+
   it 'throws an exception when no listener responds' do
     expect { subject.event_fired }.to raise_error(Bus::NoListenerRespondedError, 'No listener responded to message \'event_fired\'')
   end