Ruby

[ruby/irb] Detect multiple lines output simplify

The old implementation performance test code:

require 'objspace'
puts "%.5g MB" % (ObjectSpace.memsize_of_all * 0.001 * 0.001)
/\A.*\Z/ !~ ('abc' * 20_000_000)
puts "%.5g MB" % (ObjectSpace.memsize_of_all * 0.001 * 0.001)

and run time test.rb:

2.5868 MB
62.226 MB

real    0m1.307s
user    0m0.452s
sys     0m0.797s

The new implementation performance test code:

require 'objspace'
puts "%.5g MB" % (ObjectSpace.memsize_of_all * 0.001 * 0.001)
('abc' * 20_000_000).include?("\n")
puts "%.5g MB" % (ObjectSpace.memsize_of_all * 0.001 * 0.001)

and run time test.rb:

2.5861 MB
62.226 MB

real    0m0.132s
user    0m0.088s
sys     0m0.042s

https://github.com/ruby/irb/commit/40d6610baf