DSL Study in ruby2

I don’t like the idea of variables and methods like monthly_sales and target_sales cluttering the top-level scope.
Shall we rafactor it.

setup.rb

def event(description)
  puts "ALERT: #{description}" if yield
end

def select_sales
  puts "SELECT DATA"
  @sales = 200
end

def set_sales
  puts "SET SALES"
  @target_sales = 100
end

events.rb

load 'setup.rb'

select_sales
set_sales

event "sales is enough" do
  puts "SALES IS ENOUGH"
  @target_sales < @sales
end

event "sales is soso" do
  puts "SALES IS SOSO"
  @target_sales == @sales
end

event "sales is not enough" do
  puts "SALES IS NOT ENOUGH"
  @target_sales > @sales
end

ruby events.rb

Here are result.

SELECT DATA
SET SALES
SALES IS ENOUGH
ALERT: sales is enough
SALES IS SOSO
SALES IS NOT ENOUGH