class Raykit::Environment

def self.which(name)
  return name if File.exist?(name)
  ["", ".exe", ".bat", ".cmd"].each do |ext|
    aname = name + ext
    return aname if File.exist?(aname)
    ENV["PATH"].split(File::PATH_SEPARATOR).each do |path|
      apath = "#{path.gsub('\\', "/")}/#{aname}".gsub("//", "/")
      return apath if File.exist?(apath)
    end
  end
  ""
end