Example io-stream for #ruby IRC

command.rb

require 'io/stream'
require 'open3'

module Command
  Result = Data.define(:out, :err, :status)

  def self.run(*, **)
    Open3.popen3(*, **) do |stdin, stdout, stderr, thread|
      stdin.close

      Result.new(
        out: IO::Stream::Buffered.wrap(stdout).read,
        err: IO::Stream::Buffered.wrap(stderr).read,
        status: thread.value
      )
    end
  end
end

Command.run('ls', '-la', '/tmp')