From: Brian Candler <b.candler@...>
Date: 2008-10-21T00:23:52+09:00
Subject: Re: Error Exception if script doesn't run

jackster the jackle wrote:
> I would like to be able to add the line number of the file into the 
> error message with the file name ($0) but when I try other global 
> variables such as $@ or $. I don't get the line number of the script 
> that failed?

Use __FILE__ and __LINE__

You probably don't want $0, although it will work if all your code is in 
one file; if your script was called foo.rb but it did "require 'bar'" 
and the error was in bar.rb, then __FILE__ would be bar.rb but $0 would 
be foo.rb

But in any case, you don't need this because

   raise "Hell"

gives you a stack backtrace anyway, the first line of which is the line 
where the raise occurred.

begin
  raise "Hell"
rescue Exception => e
  puts "Error: #{e.message} at #{e.backtrace.first}"
end
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