From: Florian Gross <flgr@...>
Date: 2004-11-18T01:18:15+09:00
Subject: Re: assert

Michael Neumann wrote:

> How about this:
> 
>   def breakpoint
>     file, line_no = caller.first.split(':', 2)
>     reason = File.readlines(file)[line_no.to_i - 1].
>       strip.sub(/^breakpoint\s+/, '')
>     p reason
>     # setup irb session etc.
>   end
> 
>   a = 4
>   breakpoint unless a == 5
> 
> This extracts the "unless a == 5" out of the source file. Of course, 
> that does not work for evaled-code (unless the source-buffer is stored 
> somewhere and we could access it).

I have extracted run-time information from the source code before 
(proc_source.rb -- it finds the source code of a lambda / lambdafied 
block) and while it is a nice technique I think the overhead would be 
too high in this case. (Plus it will not work with -e which is a minor 
annoyance.)