Question

I have a string in Ruby, s (say) which might have any of the standard line endings (, , ). I want to convert all of those to s. What s the best way?

This seems like a super-common problem, but there s not much documentation about it. Obviously there are easy crude solutions, but is there anything built in to handle this?

Elegant, idiomatic-Ruby solutions are best.

EDIT: realized that ^M and are the same. But there are still three cases. (See wikipedia.)

Answer 1

Best is just to handle the two cases that you want to change specifically and not try to get too clever:

s.gsub /
?/, "
"

Answer 2

Since ruby 1.9 you can use String::encode with universal_newline: true to get all of your new lines into while keeping your encoding unchanged:

s.encode(s.encoding, universal_newline: true)

Once in a known newline state you can freely convert back to CRLF using :crlf_newline. eg: to convert a file of unknown (possibly mixed) ending to CRLF (for example), read it in binary mode, then :

s.encode(s.encoding, universal_newline: true).encode(s.encoding, crlf_newline: true)

Answer 3

I think the cleanest solution would be to use a regular expression:

s.gsub! /
?/, "
"

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