Very simple metronome

metronome.rb

#!/usr/bin/env ruby

def every(delay)
  loop do
    sleep(delay)
    yield
  end
end

def beep
  Thread.new { print "\a" }
end

# Get the BPM
if ARGV[0] == nil
  puts "Enter the BPM"
  bpm = gets.to_f
else
  bpm = ARGV[0].to_f
end

delay_seconds = 60 / bpm

every delay_seconds do 
  beep
end