https://git.ruby-lang.org/ruby.git/commit/?id=ffbb162f1a

From ffbb162f1a052054ce2864d2971e83da10f8aa78 Mon Sep 17 00:00:00 2001
From: aycabta <aycabta@g...>
Date: Tue, 25 Feb 2020 20:32:07 +0900
Subject: [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

diff --git a/lib/irb.rb b/lib/irb.rb
index de5af30..e73174e 100644
--- a/lib/irb.rb
+++ b/lib/irb.rb
@@ -738,7 +738,7 @@ module IRB https://github.com/ruby/ruby/blob/trunk/lib/irb.rb#L738
 
     def output_value # :nodoc:
       str = @context.inspect_last_value
-      multiline_p = /\A.*\Z/ !~ str
+      multiline_p = str.include?("\n")
       if multiline_p && @context.newline_before_multiline_output?
         printf @context.return_format, "\n#{str}"
       else
-- 
cgit v0.10.2


--
ML: ruby-changes@q...
Info: http://www.atdot.net/~ko1/quickml/