popen4 woo hoo

gistfile1.rb

require 'open4'

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

    pid, stdin, stdout, stderr = Open4::popen4 command
    stdin.close
    waitpid, status = Process::waitpid2 pid

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

    status
  end

end