Script to watch and compile cabal project

listen_cabal.rb

require 'listen'

Listen.to! 'test', 'src', filter: /.*\.hs/ do |modified, added, removed|
  system %|clear|
  p modified
  p added
  p removed
  if File.exists? "Rakefile"
    system %|rake|
  else
    system %|cabal configure --enable-tests && cabal build && cabal test|
  end
end

Signal.trap 'INT' do
  exit
end