guard-shell with forking?

Guardfile

module Processes
  extend self

  def max
    @max || 10
  end
  attr_writer :max

  def processes
    @processes ||= []
  end

  def can_fork_process?
    Process.respond_to?(:fork) && max > 0
  end

  def fork(command)
    if processes.size < max
      processes << Process.fork { Process.exec *command }
    else
      process.delete Process.wait
      fork command
    end
  end

  def run(command)
    if can_fork_process?
      fork command
    else
      exec command
    end
  end

end


Processes.max = 5

guard :shell do
  watch /.*/ do |m|
    Processes.run "say #{m[0]}"
  end
end