From: Eric Hodel <drbrain@...7.net>
Date: 2007-01-21T13:42:26+09:00
Subject: Re: Getting the version number for rubygems?

On Jan 20, 2007, at 20:11, Gregory Brown wrote:
> In ruport I have a tool that generates a bunch of boilerplate code for
> folks, and in it, I use require_gem to lock the files down to a
> specific version of Ruport.
>
> I'd like to make this friendly to RubyGems 0.9.1 by using the gem
> method rather than require_gem when people have 0.9.1, but want to
> generate require_gem for older versions.

Just use #gem, and don't bother being backwards-compatible.  RubyGems  
older than 0.9.1 has a serious security exploit.  (About 20% of  
rubyists are running a version of RubyGems without #gem (prior to  
0.9.1's release).)

> So basically, is there a constant or method I can call that'll give me
> back the version of rubygems that i'm running?

Don't think so hard:

require 'rubygems'
Kernel.respond_to? :gem

And now for the real answer to your question:

The rubygems constant is in Gem::RubyGemsVersion, which you can get  
from 'rubygems/rubygems_version'.  Kernel#gem first appeared in 0.9.0.

-- 
Eric Hodel - drbrain@segment7.net - http://blog.segment7.net

I LIT YOUR GEM ON FIRE!