Use host_os from RbConfig to detect host OS. #44
Merged
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RUBY_PLATFORM on JRuby is always "java", so it will not reflect the host operating system. This regex appears to be the consensus way to detect Windows based on a search of Ruby code on Github:
https://github.com/search?q=%2Fmswin%7Cmsys%7Cmingw%7Ccygwin%7Cbccwin%7Cwince%7Cemc%2F&type=Code
The regex appears to date back to at least 2012, judging by @enebo's comment here: https://stackoverflow.com/questions/11784109/detecting-operating-systems-in-ruby
The "os" gem is mentioned there as well, but probably is overkill (and would also need to be shipped with Ruby).