Kill irb sessions after x minutes of inactivity

gistfile1.txt

# Add some methods to IRB::Context and IRB::Irb
# for easier timeout implementation.
class IRB::Irb
  def status
    @signal_status
  end
end

class IRB::Context
  attr_reader :irb
  attr_reader :line_no

  def is_evaluating?
    self.irb.status == :IN_EVAL
  end
end

# Implement an auto exit timer thread. Timeout is given in seconds.
module IRB
  def self.auto_exit_after(timeout = 60)
    Thread.new {
      context    = IRB.conf[:MAIN_CONTEXT]
      last_input = Time.now
      last_line  = context.line_no

      loop {
        sleep 10

        # Check if irb is running a command
        if context.is_evaluating?
          # Reset the input time and ignore any timeouts
          last_input = Time.now
          next
        end

        # Check for new input
        if last_line != context.line_no
          # Got new input
          last_line  = context.line_no
          last_input = Time.now
          next
        end

        # No new input, check if idle time exceeded
        if Time.now - last_input > timeout    
          $stderr.puts "\n** IRB exiting due to idle timeout. Goodbye..."
          Process.kill("KILL", Process.pid)
        end
      }
    }
  end
  
end

Thread.new do
  IRB.auto_exit_after(3600)
end