Ruby: Nice text on ^C (ctrl+C) command-line interrupt

Question

I am writing a small command-line program in Ruby that looks for changes in a specific folder.

This program repeats a loop every few second to see if there are changes. To stop the program, the user can use Ctrl+C (To send ^C to the console).

Right now, Ruby sends the following stack trace when this happens:

^C./filename.rb:64:in `sleep': Interrupt
from ./filename.rb:64:in `block in parse'
from ./filename.rb:62:in `loop'
from ./filename.rb:62:in `parse'
from ./filename.rb:124:in `<main>'

I would like to change this to show an Exiting now... message, similar to what programs like Rails show when closed in this way.

How can this be done?

Answer 1

Doing ctrl + c simply sends SIGINT signal to the given ruby process. You can intercept it by rescuing Interrupt:

begin
  loop do
    puts "foo bar baz"
  end
rescue Interrupt
  puts "\nExiting..."
end