Simple pomodoro CLI tool for Linux

pomodoro.rb

#!/usr/bin/env ruby
require 'time'

module Pomodoro
  INTERVAL = 25 # minutes
  TOTAL_INTERVALS = 4
  BREAK_TIME = 5 # minutes

  def self.notify(title, body)
    system("notify-send -a pomodoro -t 5000 -u critical -i appointment '#{title}' '#{body}'")
  end

  def self.play_sound
    filepath = File.expand_path('~/bin/pomodoro-ring.wav')
    if File.exists? filepath
      fork do
        exec('aplay', '-q', filepath)
      end
    end
  end

  def self.pomodoro!
    INTERVAL.times.reverse_each do |minute|
      # Account for the 0-based offset
      minute = minute + 1
      clear!
      clear!
      tomato! "#{minute} min"
      sleep 60
    end
    notify('Pomodoro!', 'A pomodoro has ended, time for a break!')
    play_sound
  end

  def self.wait_for_enter
    key = nil
    until key == "\n"
      key = gets
    end
    nil
  end


  def self.bold(msg)
    "\033[1m#{msg}\033[22m"
  end

  def self.red(msg)
    "\033[31m#{msg}\033[0m"
  end

  def self.green(msg)
    "\033[32m#{msg}\033[0m"
  end

  def self.clear!
    print "\033[6A"
    print "\033[2J"
  end

  def self.tomato!(msg=nil)
    banner_size = 8
    unless msg.nil?
      # Center the `msg` inside of the tomato
      if msg.size < banner_size
        padding = banner_size - msg.size
        left = true
        padding.times do
          if left
            msg = " #{msg}"
          else
            msg = "#{msg} "
          end
          left = !(left)
        end
      end
    else
      msg = ' ' * banner_size
    end
    print green("""        __\W/__
""")
    print red("""     .'.-'""")
    print green('|')
    print red("""'-.'.
    /           \\
    | #{msg}  |
    \\          /
      '-.___.-'
""")
  end

  def self.minitomato!
    print red('(')
    print green('`* ')
    print red(') ')
  end

  def self.run!
    TOTAL_INTERVALS.times do |cycle|
      count = cycle + 1
      pomodoro!

      # Display our current progress in the intervals
      puts '-----------------------'
      count.times { minitomato! }
      puts

      # Only display the prompt if we're on the last pomodoro
      unless TOTAL_INTERVALS == count
        puts "Take a break! Meet me back here in #{BREAK_TIME} minutes"
        sleep (BREAK_TIME * 60)
        play_sound
        puts "Press enter to start another pomodoro"
        wait_for_enter
      end
    end

    finish_message = "#{TOTAL_INTERVALS} pomodoros have been completed, take a 30 minute break and come on back"
    puts finish_message
    notify('Pomodoro!', finish_message)
    play_sound
  end
end

begin
  Pomodoro.run!
rescue Interrupt
  puts
  puts 'exiting..hope you got your work done!'
end