From: Alex Gutteridge <alexg@...>
Date: 2007-05-25T17:17:46+09:00
Subject: Re: Ruby - Debugging

On 25 May 2007, at 16:50, Tomas Pospisek's Mailing Lists wrote:

> On Fri, 25 May 2007, Alex Gutteridge wrote:
>
>> On 25 May 2007, at 15:42, Tomas Pospisek's Mailing Lists wrote:
>>
>>> On Fri, 25 May 2007, Jorge Domenico Bucaran Romano wrote:
>>>> C:\Users\jbucaran>ruby -rdebug c:\users\jbucaran\desktop\demo2.rb
>>>> Debug.rb
>>>> Emacs support available.
>>>> C:/Program Files/Ruby/lib/ruby/site_ruby/1.8/ubygems.rb:10:require
>>>> 'rubygems'
>>>> (rdb:1) b "c:\users\jbucaran\desktop\demo2.rb"
>>>> C:/Program Files/Ruby/lib/ruby/site_ruby/1.8/ubygems.rb: 
>>>> 10:compile error
>>>> C:/Program Files/Ruby/lib/ruby/site_ruby/1.8/ubygems.rb:10:  
>>>> unterminated
>>>> string
>>>> meets end of file
>>>> (rdb:1)
>>>> I am sorry to bother like this, but is there any way I could get  
>>>> serious
>>>> documentation on how to use this, a good tutorial, maybe you can  
>>>> help me
>>>> here with a fine start. Please I can't believe it is so hard to  
>>>> do this.
>>> Did you ask Google?
>>> In your example above a file named "ubygems" is being parsed.  
>>> Looks like non-sense to me?
>>> *t
>>
>> ubygems.rb is the way rubygems is loaded when you run:
>>
>> ruby -rubygems
>
> Where "-rXYZ" means: "Please ruby, load the library XYZ first  
> please, before loading the actual program". And as can be seen  
> above, ruby does actually find a file/library named "ubygems" at
> "C:/Program Files/Ruby/lib/ruby/site_ruby/1.8/ubygems.rb" which  
> doesn't make any sense to me because (AFAIK) there doesn't exist  
> and library named "ubygems" unless Jorge did something strange and  
> placed something there.
>
> Or am I misstaken?
> *t

ubygems *is* rubygems. This is getting off-topic, but ubygems.rb is  
the reason you can write the aesthetically pleasing:

ruby -rubygems foo.rb

As well as:

ruby -rrubygems foo.rb

Note the double rr in the second one. Every installation of rubygems  
includes ubygems.rb as far as I know. Try "locate '/ubygems.rb'" on  
your system.

Alex Gutteridge

Bioinformatics Center
Kyoto University