popen3.rb

require 'open3'

module Derp

  def self.system(*args)
    raise "No arguments specified." unless args && args.class == Array && args.size > 0

    # This style of calling system allows for redirection and pipes, where the normal array style does not.
    command = (args.flatten.compact.map{|a| a.match(/ /) ? "\"#{a}\"" : a }).join(' ')
    puts command if $DEBUG

    stdin_handle, stdout_handle, stderr_handle, wait_thread = Open3::popen3 command
    pid = wait_thread.pid
    stdin_handle.close
    status = wait_thread.value
    stdout = stdout_handle.read
    stderr = stderr_handle.read
    stdout_handle.close
    stderr_handle.close

    unless status.success?
      puts "The following system call failed with return code #{ status.exitstatus }"
      puts command
      puts "pid      : #{ pid }"
      puts "stdout   : #{ stdout }"
      puts "stderr   : #{ stderr }"
    end

    Status.new(pid, stdout, stderr, status.exitstatus, status.success?)
  end

  class Status
    attr_reader :pid, :stdout, :stderr, :exitstatus, :success

    def initialize(pid, stdout, stderr, exitstatus, success)
      @pid = pid
      @stdout = stdout
      @stderr = stderr
      @exitstatus = exitstatus
      @success = success
    end

    def success?
      @success
    end

  end


end