class DEBUGGER__::Session

def process_command line
  if line.empty?
    if @repl_prev_line
      line = @repl_prev_line
    else
      return :retry
    end
  else
    @repl_prev_line = line
  end
  /([^\s]+)(?:\s+(.+))?/ =~ line
  cmd_name, cmd_arg = $1, $2
  if cmd = @commands[cmd_name]
    check_postmortem      if !cmd.postmortem
    check_unsafe          if cmd.unsafe
    cancel_auto_continue  if cmd.cancel_auto_continue
    @repl_prev_line = nil if !cmd.repeat
    cmd.block.call(cmd_arg)
  else
    @repl_prev_line = nil
    check_unsafe
    request_eval :pp, line
  end
rescue Interrupt
  return :retry
rescue SystemExit
  raise
rescue PostmortemError => e
  @ui.puts e.message
  return :retry
rescue Exception => e
  @ui.puts "[REPL ERROR] #{e.inspect}"
  @ui.puts e.backtrace.map{|e| '  ' + e}
  return :retry
end