Move discourse_plugin to lib

lib/discourse_event.rb

@@ -0,0 +1,24 @@
+# This is meant to be used by plugins to trigger and listen to events
+# So we can execute code when things happen.
+module DiscourseEvent
+
+  # Defaults to a hash where default values are empty sets.
+  def self.events
+    @events ||= Hash.new { |hash, key| hash[key] = Set.new }
+  end
+
+  def self.trigger(event_name, *params)
+    events[event_name].each do |event|
+      event.call(*params)
+    end
+  end
+
+  def self.on(event_name, &block)
+    events[event_name] << block
+  end
+
+  def self.clear
+    @events = nil
+  end
+
+end