From: Luis Lavena <luislavena@...>
Date: 2011-01-14T23:10:20+09:00
Subject: Re: Best practice to require external code dependency ?

On Jan 14, 11:02 am, Bernard Lambeau <blamb...@gmail.com> wrote:
> * What if I have a bin/foo executable? Should I make something special there
> if I have version requirements on external libs ??
>

Actually no.

RubyGems will wrap your bin/foo script with a loader that looks like
this:

require 'rubygems'

version = ">= 0"

if ARGV.first =~ /^_(.*)_$/ and Gem::Version.correct? $1 then
  version = $1
  ARGV.shift
end

gem 'mygem', version
load Gem.bin_path('mygem', 'foo', version)

So your foo script don't need to require rubygems.

And when developing, if you run through rspec, it will already load
rubygems for you.

If you want to test from the command line, then you can:

ruby -rrubygems -Ilib bin/foo

Or simple put RUBYOPT=-rrubygems

and have ruby -Ilib bin/foo

So, under your environment will have rubygems and nowhere in your
code.

--
Luis Lavena