From: Gennady <gfb@...>
Date: 2003-12-05T08:32:31+09:00
Subject: Re: Generalized break?



Joel VanderWerf wrote:

> Hal Fulton wrote:
> 
>> 2. I have a mild dislike for the idiom if $0 == __FILE__ (lines) end
>> -- because I always indent inside an if, and I don't want to indent,
>> and I really just want to say:  break if $0 != __FILE__
> 
> 
> This seems to work:
> 
> === x.rb ===
> puts "loading x.rb"
> 
> alias old_load load
> def load(*args)
>   catch :break_from_load do
>     old_load(*args)
>   end
> end
> 
> throw :break_from_load unless __FILE__ == $0
> 
> puts "a"
> 
> load(__FILE__)
> 
> puts "b"
> ============
> 
> 

You get the following error when you 'require' this file:

irb(main):001:0> require 'x'
loading x.rb
NameError: uncaught throw `break_from_load'
         from ./x.rb:11:in `throw'
         from ./x.rb:11
         from (irb):1:in `require'
         from (irb):1
irb(main):002:0>


Gennady.