* ext/psych/lib/psych/visitors/yaml_tree.rb: use literal YAML style

when emitting multi-line strings. Thanks @atambo

* test/psych/test_yaml.rb: test for change.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@37698 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,10 @@
+Sat Nov 17 12:14:50 2012  Aaron Patterson <aaron@tenderlovemaking.com>
+
+	* ext/psych/lib/psych/visitors/yaml_tree.rb: use literal YAML style
+	  when emitting multi-line strings. Thanks @atambo
+
+	* test/psych/test_yaml.rb: test for change.
+
 Sat Nov 17 12:03:41 2012  Aaron Patterson <aaron@tenderlovemaking.com>
 
 	* ext/psych/lib/psych/scalar_scanner.rb: avoid raising exceptions when

ext/psych/lib/psych/visitors/yaml_tree.rb

@@ -231,15 +231,18 @@ module Psych
         plain = false
         quote = false
         style = Nodes::Scalar::ANY
+        tag   = nil
+        str   = o
 
         if binary?(o)
           str   = [o].pack('m').chomp
           tag   = '!binary' # FIXME: change to below when syck is removed
           #tag   = 'tag:yaml.org,2002:binary'
           style = Nodes::Scalar::LITERAL
+        elsif o =~ /\n/
+          quote = true
+          style = Nodes::Scalar::LITERAL
         else
-          str   = o
-          tag   = nil
           quote = !(String === @ss.tokenize(o))
           plain = !quote
         end

test/psych/test_yaml.rb

@@ -1266,4 +1266,9 @@ EOY
       Psych.load("2000-01-01 00:00:00.#{"0"*1000} +00:00\n")
       # '[ruby-core:13735]'
     end
+
+    def test_multiline_string_uses_literal_style
+      yaml = Psych.dump("multi\nline\nstring")
+      assert_match("|", yaml)
+    end
 end