Callbacks module extended

Now supports callback methods as well observer classes

levels example now uses callback methods

register,deregister now alias add/remove observer methods

minor version bump

README.md

@@ -16,14 +16,10 @@
 ### Bundler
 
 ```
-bundle add 'obsws'
+bundle add obsws
 bundle install
 ```
 
-### Gem
-
-`gem install 'obsws'`
-
 ## `Use`
 
 #### Example `main.rb`
@@ -67,23 +63,28 @@ For a full list of requests refer to [Requests](https://github.com/obsproject/ob
 
 ### Events
 
-Register an observer class and define `on_` methods for events. Method names should match the api event but snake cased.
+Register `on_` callback methods. Method names should match the api event but snake cased.
 
 example:
 
 ```ruby
 class Observer
     def initialize
-        @e_client = OBSWS::Events::Client.new(**kwargs)
-        # register class with the event client
-        @e_client.add_observer(self)
+        @e_client = OBSWS::Events::Client.new(host: "localhost", port: 4455, password: "strongpassword")
+        # register callback methods with the Event client
+        @e_client.register(
+          [
+            method(:on_current_program_scene_changed),
+            method(:on_input_mute_state_changed)
+          ]
+        )
     end
 
     # define "on_" event methods.
-    def on_current_program_scene_changed
+    def on_current_program_scene_changed(data)
         ...
     end
-    def on_input_mute_state_changed
+    def on_input_mute_state_changed(data)
         ...
     end
     ...

examples/events/main.rb

@@ -21,11 +21,9 @@ class Main
   def infostring
     resp = @r_client.get_version
     [
-      "Using obs version:",
-      resp.obs_version,
-      "With websocket version:",
-      resp.obs_web_socket_version
-    ].join("\n")
+      "Using obs version: #{resp.obs_version}.",
+      "With websocket version: #{resp.obs_web_socket_version}"
+    ].join(" ")
   end
 
   def on_current_program_scene_changed(data)

examples/levels/main.rb

@@ -1,7 +1,6 @@
 require_relative "../../lib/obsws"
 require "yaml"
 
-
 module LevelTypes
   VU = 0
   POSTFADER = 1
@@ -14,7 +13,12 @@ class Main
   def initialize(**kwargs)
     subs = OBSWS::Events::SUBS::LOW_VOLUME | OBSWS::Events::SUBS::INPUTVOLUMEMETERS
     @e_client = OBSWS::Events::Client.new(subs:, **kwargs)
-    @e_client.add_observer(self)
+    @e_client.register(
+      [
+        method(:on_input_mute_state_changed),
+        method(:on_input_volume_meters)
+      ]
+    )
   end
 
   def run

lib/obsws/event.rb

@@ -43,7 +43,7 @@ module OBSWS
 
       def add_observer(observer)
         observer = [observer] if !observer.respond_to? :each
-        observer.each { |o| observers << o }
+        observer.each { |o| observers << o unless observers.include? o }
       end
 
       def remove_observer(observer)
@@ -52,15 +52,18 @@ module OBSWS
 
       def notify_observers(event, data)
         observers.each do |o|
-          if o.respond_to? "on_#{snakecase(event)}"
-            if data.empty?
-              o.send("on_#{snakecase(event)}")
-            else
-              o.send("on_#{snakecase(event)}", data)
+          if o.is_a? Method
+            if o.name.to_s == "on_#{snakecase(event)}"
+              data.empty? ? o.call : o.call(data)
             end
+          elsif o.respond_to? "on_#{snakecase(event)}"
+            data.empty? ? o.send("on_#{snakecase(event)}") : o.send("on_#{snakecase(event)}", data)
           end
         end
       end
+
+      alias_method :register, :add_observer
+      alias_method :deregister, :remove_observer
     end
 
     class Client

lib/obsws/version.rb

@@ -7,11 +7,11 @@ module OBSWS
     end
 
     def minor
-      3
+      4
     end
 
     def patch
-      3
+      0
     end
 
     def to_a