From: Marc Weber <marco-oweber@...>
Date: 2013-07-21T07:14:07+09:00
Subject: Re: Ruby Debugger

github.com/MarcWeber/vim-addon-ruby-debug-ide 
(requires some additional patches, see README, never got -ide working
with recent ruby, may require unix like environment due to
vim-addon-async - since recently there is a rb script which might work
on windows, too)

github.com/MarcWeber/mwr/vim-addon-rdebug
(only requires require "debug")

There may be more options, such as vdebug etc (I never used them)

Pay attention to the README files. Implementation may be incomplete.
In both cases you can pass commands to the debugger by the DEBUG buffer
(-> see vim-addon-async docs)

Marc Weber