gistfile1.rbx

module FileUtils
  def which(file)
    extensions = ENV['PATHEXT'].split(File::PATH_SEPARATOR) rescue []
    pattern = "#{file}{#{extensions.join(',').downcase}}"
    ENV['PATH'].split(File::PATH_SEPARATOR).each do |path|
      candidate = Dir.glob(File.join(File.expand_path(path), pattern)).first
      return candidate if candidate && File.executable?(candidate)
    end
  end
end