From: Jim Weirich <jim@...>
Date: 2006-03-25T06:12:04+09:00
Subject: Re: require a certain version of the ruby interpreter

Shea Martin wrote:
> I would like to enforce ruby 1.8.4 or higher.
> 
> if VERSION < "1.8.4"
> 	raise "Invalid version"
> end
> 
> Fails when VERSION is "1.8.10".
> 
> Yeah, I know I could write my own string comparison, but was wondering
> if there is a canned solution for this?

  if Gem::Version.new(VERSION) < Gem::Version.new("1.8.4")
    raise "Invalid Version"
  end

Or, if you want to get fancy, you could specify any version greater than 
or equal to 1.8.4, but less than 1.9.

  r = Gem::Requirement.new("~> 1.8.4")
  unless r.satisfied_by?(Gem::Version(VERSION))
    raise "Invalid version, must be #{r}"
  end

Just make sure that rubygems is loaded to use this.

--
-- Jim Weirich



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