From: Brent Roman <brent@...>
Date: 2004-12-27T13:19:04+09:00
Subject: Re: Breakpoints on 1.6.8?

I don't know if it's working "correctly", but it is functional.
I liked the breakpoint idea so much that I distilled it
into the following for 1.6.8:

   module IRB
   #normal usage is:
   #  breakpoint binding
   #drops into another IRB session with the caller's binding
   #exit (optional return value) to resume the broken thread
     def IRB.breakpoint(workspace = nil, name="breakpoint")
       puts "At #{name}:"
       workspace = IRB::WorkSpace.new workspace if
		workspace.is_a? Binding
       @CONF[:MAIN_CONTEXT] = (irb = IRB::Irb.new(workspace)).context

       oldTrap = trap 'INT' do
         irb.signal_handle
       end
       result = catch :IRB_EXIT do
         begin
           irb.eval_input
         rescue Exception
           print $!.type, ": ", $!, "\n"
           retry
         end
       end
       trap ('INT', nil, &oldTrap)
       result
     end
   end
   def breakpoint (*args)
     IRB.breakpoint(*args)
   end


The main limitation of this hack verses the real one is that the caller
must explicitly pass the binding into the breakpoint.  There's no
"bindingOfCaller".  If you'd like to take a crack at that, I'd be most
grateful.

-- 
  Brent Roman
  mailto:brent@mbari.org  http://www.mbari.org/~brent