From: Bernard Lambeau <blambeau@...>
Date: 2011-01-14T23:26:49+09:00
Subject: Re: Best practice to require external code dependency ?

--0015175cdef297d31f0499cf2001
Content-Type: text/plain; charset=ISO-8859-1

I see (I was currently re-reading https://gist.github.com/54177, which is
clear in fact -- my apologies).

I understand that users of my library will have a good _foo_ executable that
works fine :-)

Now, as a developer I would like to be able to run (no rake, no rspec, and
so on):

    ruby -rrubygems bin/foo

How are version requirements met in that scenario? I assume they are not and
that rubygems will load last versions of all gems?

Should I configure rvm's gemsets on my devel computer ? or do you use
Bundler to manage that case ??

Thanks again for clarification!
B

On Fri, Jan 14, 2011 at 3:10 PM, Luis Lavena <luislavena@gmail.com> wrote:

> 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
>
>

--0015175cdef297d31f0499cf2001--