When debugging in python, I use ipython's ipdb debugger to set breakpoints.
I can add the following code in the location I want to stop:
import ipdb; ipdb.set_trace()
I wanted something similar for ruby. I got the same behaviour set up with the following code and patching using irb_completion's output.
Install the required gem files:
gem install ruby-debug-base
gem install ruby-debug
gem install wirble
gem install patch_irb_completion;patch_irb_completion
Modify the ruby file to be debugged:
require 'rubygems'
require 'ruby-debug'
require 'wirble'
Wirble.init
Wirble.colorize
debugger #location to stop
running the code with the --debug option will stop at the requested location and drop an rdb prompt with tab completion.
Reference:
http://stackoverflow.com/questions/2504515/what-do-i-put-in-my-ruby-jruby-code-to-break-into-the-debugger
http://www.unboxedconsulting.com/blog/irc-completion-from-the-debugger
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