I just started to learn the ruby debugger. Its pretty helpful in those cases where puts just doesn't cut it. I found a good introductory article on this over at IBM: Debugging Ruby programs 101 (registration required). One of the most annoying things was that there seemed to be a catchpoint on every single exception that was raised. I had to keep hitting c just to get to my first actual breakpoint. I found the solution to this problem over at comp.lang.ruby. Basically, there is a default catchpoint on StandardError so you are prompted at all raise exceptions. What you need to do to fix this is just set a catchpoint for your own type of error. So when you start up simply:
It will remove the default catchpoint and catch only on MyOtherError.
A short hack. Make a copy of debug.rb and put these lines right after the Context class. class Context alias original_readline readline def readline(prompt, hist) @rc_file ||= File.readlines("debug.rc") if @rc_file.empty? original_readline(prompt, hist) else @rc_file.shift end end end Now create a file debug.rc with your desired breakpoint: b 100 b 200 Start the debugger: ruby -r./debug myscript.rb
Of course, this isn't a totally clean solution in that you are editing a standard file. Also, I don't think this code would work if the debug.rc file did not exist. Nonetheless, its the easiest method I've seen so far.